1632 lines
58 KiB
Nim
1632 lines
58 KiB
Nim
#
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# Chronos HTTP/S client
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# (c) Copyright 2021-Present
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# Status Research & Development GmbH
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#
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# Licensed under either of
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# Apache License, version 2.0, (LICENSE-APACHEv2)
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# MIT license (LICENSE-MIT)
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import std/[uri, tables, sequtils]
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import stew/[results, base10, base64, byteutils], httputils
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import ../../asyncloop, ../../asyncsync
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import ../../streams/[asyncstream, tlsstream, chunkstream, boundstream]
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import httptable, httpcommon, httpagent, httpbodyrw, multipart
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export results, asyncloop, asyncsync, asyncstream, tlsstream, chunkstream,
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boundstream, httptable, httpcommon, httpagent, httpbodyrw, multipart,
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httputils, uri
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export SocketFlags
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const
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HttpMaxHeadersSize* = 8192
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## Maximum size of HTTP headers in octets
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HttpConnectTimeout* = 12.seconds
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## Timeout for connecting to host (12 sec)
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HttpHeadersTimeout* = 120.seconds
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## Timeout for receiving response headers (120 sec)
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HttpConnectionIdleTimeout* = 60.seconds
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## Time after which idle connections are removed from the HttpSession's
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## connections pool (120 sec)
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HttpConnectionCheckPeriod* = 10.seconds
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## Period of time between idle connections checks in HttpSession's
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## connection pool (10 sec)
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HttpMaxRedirections* = 10
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## Maximum number of Location redirections.
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HttpClientConnectionTrackerName* = "httpclient.connection"
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## HttpClient connection leaks tracker name
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HttpClientRequestTrackerName* = "httpclient.request"
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## HttpClient request leaks tracker name
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HttpClientResponseTrackerName* = "httpclient.response"
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## HttpClient response leaks tracker name
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type
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HttpClientConnectionState* {.pure.} = enum
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Closed ## Connection has been closed
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Closing, ## Connection is closing
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Resolving, ## Resolving remote hostname
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Connecting, ## Connecting to remote server
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Ready, ## Connected to remote server
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Acquired, ## Connection is acquired for use
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RequestHeadersSending, ## Sending request headers
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RequestHeadersSent, ## Request headers has been sent
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RequestBodySending, ## Sending request body
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RequestBodySent, ## Request body has been sent
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ResponseHeadersReceiving, ## Receiving response headers
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ResponseHeadersReceived, ## Response headers has been received
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ResponseBodyReceiving, ## Receiving response body
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ResponseBodyReceived, ## Response body has been received
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Error ## Error happens
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HttpClientScheme* {.pure.} = enum
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NonSecure, ## Non-secure connection
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Secure ## Secure TLS connection
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HttpReqRespState* {.pure.} = enum
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Closed, ## Request/response has been closed
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Closing, ## Request/response is closing
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Ready, ## Request/response is ready
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Open, ## Request/response started
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Finished, ## Request/response has been sent/received
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Error ## Request/response in error state
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HttpClientBodyFlag* {.pure.} = enum
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Sized, ## `Content-Length` present
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Chunked, ## `Transfer-Encoding: chunked` present
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Custom ## None of the above
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HttpClientRequestFlag* {.pure.} = enum
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DedicatedConnection, ## Create new HTTP connection for request
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CloseConnection ## Send `Connection: close` in request
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HttpClientConnectionFlag* {.pure.} = enum
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Request, ## Connection has pending request
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Response, ## Connection has pending response
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KeepAlive, ## Connection should be kept alive
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NoBody ## Connection response do not have body
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HttpHeaderTuple* = tuple
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key: string
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value: string
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HttpResponseTuple* = tuple
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status: int
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data: seq[byte]
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HttpClientConnection* = object of RootObj
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id*: uint64
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case kind*: HttpClientScheme
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of HttpClientScheme.NonSecure:
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discard
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of HttpClientScheme.Secure:
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treader*: AsyncStreamReader
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twriter*: AsyncStreamWriter
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tls*: TLSAsyncStream
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transp*: StreamTransport
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reader*: AsyncStreamReader
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writer*: AsyncStreamWriter
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state*: HttpClientConnectionState
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error*: ref HttpError
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remoteHostname*: string
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flags*: set[HttpClientConnectionFlag]
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timestamp*: Moment
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duration*: Duration
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HttpClientConnectionRef* = ref HttpClientConnection
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HttpSessionRef* = ref object
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connections*: Table[string, seq[HttpClientConnectionRef]]
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counter*: uint64
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maxRedirections*: int
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connectTimeout*: Duration
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headersTimeout*: Duration
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idleTimeout: Duration
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idlePeriod: Duration
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watcherFut: Future[void]
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connectionBufferSize*: int
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maxConnections*: int
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connectionsCount*: int
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socketFlags*: set[SocketFlags]
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flags*: HttpClientFlags
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HttpAddress* = object
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id*: string
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scheme*: HttpClientScheme
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hostname*: string
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port*: uint16
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path*: string
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query*: string
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anchor*: string
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username*: string
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password*: string
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addresses*: seq[TransportAddress]
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HttpClientRequest* = object
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state: HttpReqRespState
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meth*: HttpMethod
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address*: HttpAddress
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version*: HttpVersion
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headers*: HttpTable
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bodyFlag: HttpClientBodyFlag
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flags: set[HttpClientRequestFlag]
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connection*: HttpClientConnectionRef
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session*: HttpSessionRef
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error*: ref HttpError
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buffer*: seq[byte]
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writer*: HttpBodyWriter
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redirectCount: int
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timestamp*: Moment
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duration*: Duration
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HttpClientRequestRef* = ref HttpClientRequest
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HttpClientResponse* = object
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state: HttpReqRespState
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requestMethod*: HttpMethod
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address*: HttpAddress
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status*: int
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reason*: string
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version*: HttpVersion
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headers*: HttpTable
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connection*: HttpClientConnectionRef
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session*: HttpSessionRef
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reader*: HttpBodyReader
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error*: ref HttpError
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bodyFlag*: HttpClientBodyFlag
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contentEncoding*: set[ContentEncodingFlags]
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transferEncoding*: set[TransferEncodingFlags]
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contentLength*: uint64
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contentType*: Opt[ContentTypeData]
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timestamp*: Moment
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duration*: Duration
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HttpClientResponseRef* = ref HttpClientResponse
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HttpClientFlag* {.pure.} = enum
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NoVerifyHost, ## Skip remote server certificate verification
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NoVerifyServerName, ## Skip remote server name CN verification
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NoInet4Resolution, ## Do not resolve server hostname to IPv4 addresses
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NoInet6Resolution, ## Do not resolve server hostname to IPv6 addresses
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NoAutomaticRedirect, ## Do not handle HTTP redirection automatically
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NewConnectionAlways, ## Always create new connection to HTTP server
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Http11Pipeline ## Enable HTTP/1.1 pipelining
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HttpClientFlags* = set[HttpClientFlag]
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ServerSentEvent* = object
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name*: string
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data*: string
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HttpAddressResult* = Result[HttpAddress, HttpAddressErrorType]
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# HttpClientRequestRef valid states are:
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# Ready -> Open -> (Finished, Error) -> (Closing, Closed)
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#
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# HttpClientResponseRef valid states are
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# Open -> (Finished, Error) -> (Closing, Closed)
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template checkClosed(reqresp: untyped): untyped =
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if reqresp.connection.state in {HttpClientConnectionState.Closing,
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HttpClientConnectionState.Closed}:
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let e = newHttpUseClosedError()
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reqresp.setError(e)
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raise e
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template setTimestamp(conn: HttpClientConnectionRef,
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moment: Moment): untyped =
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if not(isNil(conn)):
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conn.timestamp = moment
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template setTimestamp(
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reqresp: HttpClientRequestRef|HttpClientRequestRef
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): untyped =
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if not(isNil(reqresp)):
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let timestamp = Moment.now()
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reqresp.timestamp = timestamp
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reqresp.connection.setTimestamp(timestamp)
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template setTimestamp(resp: HttpClientResponseRef, moment: Moment): untyped =
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if not(isNil(resp)):
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resp.timestamp = moment
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resp.connection.setTimestamp(moment)
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template setDuration(
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reqresp: HttpClientRequestRef|HttpClientResponseRef
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): untyped =
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if not(isNil(reqresp)):
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let timestamp = Moment.now()
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reqresp.duration = timestamp - reqresp.timestamp
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reqresp.connection.setTimestamp(timestamp)
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template setDuration(conn: HttpClientConnectionRef): untyped =
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if not(isNil(conn)):
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let timestamp = Moment.now()
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conn.duration = timestamp - conn.timestamp
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conn.setTimestamp(timestamp)
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template isReady(conn: HttpClientConnectionRef): bool =
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(conn.state == HttpClientConnectionState.Ready) and
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(HttpClientConnectionFlag.KeepAlive in conn.flags) and
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(HttpClientConnectionFlag.Request notin conn.flags) and
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(HttpClientConnectionFlag.Response notin conn.flags)
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template isIdle(conn: HttpClientConnectionRef, timestamp: Moment,
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timeout: Duration): bool =
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(timestamp - conn.timestamp) >= timeout
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proc sessionWatcher(session: HttpSessionRef) {.async.}
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proc new*(t: typedesc[HttpSessionRef],
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flags: HttpClientFlags = {},
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maxRedirections = HttpMaxRedirections,
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connectTimeout = HttpConnectTimeout,
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headersTimeout = HttpHeadersTimeout,
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connectionBufferSize = DefaultStreamBufferSize,
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maxConnections = -1,
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idleTimeout = HttpConnectionIdleTimeout,
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idlePeriod = HttpConnectionCheckPeriod,
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socketFlags: set[SocketFlags] = {}): HttpSessionRef {.
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raises: [] .} =
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## Create new HTTP session object.
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##
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## ``maxRedirections`` - maximum number of HTTP 3xx redirections
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## ``connectTimeout`` - timeout for ongoing HTTP connection
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## ``headersTimeout`` - timeout for receiving HTTP response headers
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## ``idleTimeout`` - timeout to consider HTTP connection as idle
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## ``idlePeriod`` - period of time to check HTTP connections for inactivity
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doAssert(maxRedirections >= 0, "maxRedirections should not be negative")
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var res = HttpSessionRef(
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flags: flags,
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maxRedirections: maxRedirections,
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connectTimeout: connectTimeout,
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headersTimeout: headersTimeout,
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connectionBufferSize: connectionBufferSize,
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maxConnections: maxConnections,
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idleTimeout: idleTimeout,
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idlePeriod: idlePeriod,
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connections: initTable[string, seq[HttpClientConnectionRef]](),
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socketFlags: socketFlags
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)
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res.watcherFut =
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if HttpClientFlag.Http11Pipeline in flags:
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sessionWatcher(res)
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else:
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newFuture[void]("session.watcher.placeholder")
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res
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proc getTLSFlags(flags: HttpClientFlags): set[TLSFlags] {.raises: [] .} =
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var res: set[TLSFlags]
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if HttpClientFlag.NoVerifyHost in flags:
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res.incl(TLSFlags.NoVerifyHost)
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if HttpClientFlag.NoVerifyServerName in flags:
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res.incl(TLSFlags.NoVerifyServerName)
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res
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proc getHttpAddress*(
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url: Uri,
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flags: HttpClientFlags = {}
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): HttpAddressResult {.raises: [].} =
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let
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scheme =
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if len(url.scheme) == 0:
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HttpClientScheme.NonSecure
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else:
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case toLowerAscii(url.scheme)
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of "http":
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HttpClientScheme.NonSecure
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of "https":
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HttpClientScheme.Secure
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else:
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return err(HttpAddressErrorType.InvalidUrlScheme)
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port =
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if len(url.port) == 0:
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case scheme
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of HttpClientScheme.NonSecure:
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80'u16
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of HttpClientScheme.Secure:
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443'u16
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else:
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Base10.decode(uint16, url.port).valueOr:
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return err(HttpAddressErrorType.InvalidPortNumber)
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hostname =
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block:
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if len(url.hostname) == 0:
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return err(HttpAddressErrorType.MissingHostname)
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url.hostname
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id = hostname & ":" & Base10.toString(port)
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addresses =
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if (HttpClientFlag.NoInet4Resolution in flags) and
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(HttpClientFlag.NoInet6Resolution in flags):
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# DNS resolution is disabled.
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try:
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@[initTAddress(hostname, Port(port))]
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except TransportAddressError:
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return err(HttpAddressErrorType.InvalidIpHostname)
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else:
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try:
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if (HttpClientFlag.NoInet4Resolution notin flags) and
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(HttpClientFlag.NoInet6Resolution notin flags):
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# DNS resolution for both IPv4 and IPv6 addresses.
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resolveTAddress(hostname, Port(port))
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else:
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if HttpClientFlag.NoInet6Resolution in flags:
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# DNS resolution only for IPv4 addresses.
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resolveTAddress(hostname, Port(port), AddressFamily.IPv4)
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else:
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# DNS resolution only for IPv6 addresses
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resolveTAddress(hostname, Port(port), AddressFamily.IPv6)
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except TransportAddressError:
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return err(HttpAddressErrorType.NameLookupFailed)
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if len(addresses) == 0:
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return err(HttpAddressErrorType.NoAddressResolved)
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ok(HttpAddress(id: id, scheme: scheme, hostname: hostname, port: port,
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path: url.path, query: url.query, anchor: url.anchor,
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username: url.username, password: url.password,
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addresses: addresses))
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proc getHttpAddress*(
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url: string,
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flags: HttpClientFlags = {}
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): HttpAddressResult {.raises: [].} =
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getHttpAddress(parseUri(url), flags)
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proc getHttpAddress*(
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session: HttpSessionRef,
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url: Uri
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): HttpAddressResult {.raises: [].} =
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getHttpAddress(url, session.flags)
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proc getHttpAddress*(
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session: HttpSessionRef,
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url: string
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): HttpAddressResult {.raises: [].} =
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## Create new HTTP address using URL string ``url`` and .
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getHttpAddress(parseUri(url), session.flags)
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proc getAddress*(session: HttpSessionRef, url: Uri): HttpResult[HttpAddress] {.
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raises: [] .} =
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let scheme =
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if len(url.scheme) == 0:
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HttpClientScheme.NonSecure
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else:
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case toLowerAscii(url.scheme)
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of "http":
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HttpClientScheme.NonSecure
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of "https":
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HttpClientScheme.Secure
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else:
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return err("URL scheme not supported")
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let port =
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if len(url.port) == 0:
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case scheme
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of HttpClientScheme.NonSecure:
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80'u16
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of HttpClientScheme.Secure:
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443'u16
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else:
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let res = Base10.decode(uint16, url.port)
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if res.isErr():
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return err("Invalid URL port number")
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res.get()
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let hostname =
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block:
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if len(url.hostname) == 0:
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return err("URL hostname is missing")
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url.hostname
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let id = hostname & ":" & Base10.toString(port)
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let addresses =
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try:
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if (HttpClientFlag.NoInet4Resolution in session.flags) and
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(HttpClientFlag.NoInet6Resolution in session.flags):
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# DNS resolution is disabled.
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@[initTAddress(hostname, Port(port))]
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else:
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if (HttpClientFlag.NoInet4Resolution notin session.flags) and
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(HttpClientFlag.NoInet6Resolution notin session.flags):
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# DNS resolution for both IPv4 and IPv6 addresses.
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resolveTAddress(hostname, Port(port))
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else:
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if HttpClientFlag.NoInet6Resolution in session.flags:
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# DNS resolution only for IPv4 addresses.
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resolveTAddress(hostname, Port(port), AddressFamily.IPv4)
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else:
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# DNS resolution only for IPv6 addresses
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resolveTAddress(hostname, Port(port), AddressFamily.IPv6)
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except TransportAddressError:
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return err("Could not resolve address of remote server")
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if len(addresses) == 0:
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return err("Could not resolve address of remote server")
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ok(HttpAddress(id: id, scheme: scheme, hostname: hostname, port: port,
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path: url.path, query: url.query, anchor: url.anchor,
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username: url.username, password: url.password,
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addresses: addresses))
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proc getAddress*(session: HttpSessionRef,
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url: string): HttpResult[HttpAddress] {.raises: [].} =
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## Create new HTTP address using URL string ``url`` and .
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session.getAddress(parseUri(url))
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proc getAddress*(address: TransportAddress,
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ctype: HttpClientScheme = HttpClientScheme.NonSecure,
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queryString: string = "/"): HttpAddress {.raises: [].} =
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## Create new HTTP address using Transport address ``address``, connection
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## type ``ctype`` and query string ``queryString``.
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let uri = parseUri(queryString)
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HttpAddress(id: $address, scheme: ctype, hostname: address.host,
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port: uint16(address.port), path: uri.path, query: uri.query,
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anchor: uri.anchor, username: "", password: "", addresses: @[address]
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)
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|
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proc getUri*(address: HttpAddress): Uri =
|
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## Retrieve URI from ``address``.
|
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let scheme =
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case address.scheme
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of HttpClientScheme.NonSecure:
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"http"
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of HttpClientScheme.Secure:
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"https"
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Uri(
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scheme: scheme, username: address.username, password: address.password,
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hostname: address.hostname, port: Base10.toString(address.port),
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path: address.path, query: address.query, anchor: address.anchor,
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opaque: false
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)
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proc redirect*(srcuri, dsturi: Uri): Uri =
|
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## Transform original's URL ``srcuri`` to ``dsturi``.
|
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if (len(dsturi.scheme) > 0) and (len(dsturi.hostname) > 0):
|
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# `dsturi` is absolute URL, replace
|
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dsturi
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else:
|
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# `dsturi` is relative URL, combine
|
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var tmpuri = dsturi
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tmpuri.username = ""
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tmpuri.password = ""
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combine(srcuri, tmpuri)
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|
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proc redirect*(session: HttpSessionRef,
|
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srcaddr: HttpAddress, uri: Uri): HttpResult[HttpAddress] =
|
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## Transform original address ``srcaddr`` using redirected url ``uri`` and
|
|
## session ``session`` parameters.
|
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let srcuri = srcaddr.getUri()
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var newuri = srcuri.redirect(uri)
|
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if newuri.hostname != srcuri.hostname:
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session.getAddress(newuri)
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else:
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let scheme =
|
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case newuri.scheme
|
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of "http":
|
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HttpClientScheme.NonSecure
|
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of "https":
|
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HttpClientScheme.Secure
|
|
else:
|
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return err("URL scheme not supported")
|
|
|
|
let port =
|
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if len(newuri.port) == 0:
|
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case scheme:
|
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of HttpClientScheme.NonSecure:
|
|
80'u16
|
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of HttpClientScheme.Secure:
|
|
443'u16
|
|
else:
|
|
let res = Base10.decode(uint16, newuri.port)
|
|
if res.isErr():
|
|
return err("Invalid URL port number")
|
|
res.get()
|
|
|
|
if len(newuri.hostname) == 0:
|
|
return err("URL hostname is missing")
|
|
|
|
let id = newuri.hostname & ":" & Base10.toString(port)
|
|
|
|
ok(HttpAddress(
|
|
id: id, scheme: scheme, hostname: newuri.hostname, port: port,
|
|
path: newuri.path, query: newuri.query, anchor: newuri.anchor,
|
|
username: newuri.username, password: newuri.password,
|
|
addresses: srcaddr.addresses
|
|
))
|
|
|
|
proc getUniqueConnectionId(session: HttpSessionRef): uint64 =
|
|
inc(session.counter)
|
|
session.counter
|
|
|
|
proc new(t: typedesc[HttpClientConnectionRef], session: HttpSessionRef,
|
|
ha: HttpAddress, transp: StreamTransport): HttpClientConnectionRef =
|
|
case ha.scheme
|
|
of HttpClientScheme.NonSecure:
|
|
let res = HttpClientConnectionRef(
|
|
id: session.getUniqueConnectionId(),
|
|
kind: HttpClientScheme.NonSecure,
|
|
transp: transp,
|
|
reader: newAsyncStreamReader(transp),
|
|
writer: newAsyncStreamWriter(transp),
|
|
state: HttpClientConnectionState.Connecting,
|
|
remoteHostname: ha.id
|
|
)
|
|
trackCounter(HttpClientConnectionTrackerName)
|
|
res
|
|
of HttpClientScheme.Secure:
|
|
let treader = newAsyncStreamReader(transp)
|
|
let twriter = newAsyncStreamWriter(transp)
|
|
let tls = newTLSClientAsyncStream(treader, twriter, ha.hostname,
|
|
flags = session.flags.getTLSFlags())
|
|
let res = HttpClientConnectionRef(
|
|
id: session.getUniqueConnectionId(),
|
|
kind: HttpClientScheme.Secure,
|
|
transp: transp,
|
|
treader: treader,
|
|
twriter: twriter,
|
|
reader: tls.reader,
|
|
writer: tls.writer,
|
|
tls: tls,
|
|
state: HttpClientConnectionState.Connecting,
|
|
remoteHostname: ha.id
|
|
)
|
|
trackCounter(HttpClientConnectionTrackerName)
|
|
res
|
|
|
|
proc setError(request: HttpClientRequestRef, error: ref HttpError) {.
|
|
raises: [] .} =
|
|
request.error = error
|
|
request.state = HttpReqRespState.Error
|
|
if not(isNil(request.connection)):
|
|
request.connection.state = HttpClientConnectionState.Error
|
|
request.connection.error = error
|
|
|
|
proc setError(response: HttpClientResponseRef, error: ref HttpError) {.
|
|
raises: [] .} =
|
|
response.error = error
|
|
response.state = HttpReqRespState.Error
|
|
if not(isNil(response.connection)):
|
|
response.connection.state = HttpClientConnectionState.Error
|
|
response.connection.error = error
|
|
|
|
proc closeWait(conn: HttpClientConnectionRef) {.async.} =
|
|
## Close HttpClientConnectionRef instance ``conn`` and free all the resources.
|
|
if conn.state notin {HttpClientConnectionState.Closing,
|
|
HttpClientConnectionState.Closed}:
|
|
conn.state = HttpClientConnectionState.Closing
|
|
let pending =
|
|
block:
|
|
var res: seq[Future[void]]
|
|
if not(isNil(conn.reader)) and not(conn.reader.closed()):
|
|
res.add(conn.reader.closeWait())
|
|
if not(isNil(conn.writer)) and not(conn.writer.closed()):
|
|
res.add(conn.writer.closeWait())
|
|
if conn.kind == HttpClientScheme.Secure:
|
|
res.add(conn.treader.closeWait())
|
|
res.add(conn.twriter.closeWait())
|
|
res.add(conn.transp.closeWait())
|
|
res
|
|
if len(pending) > 0: await noCancel(allFutures(pending))
|
|
conn.state = HttpClientConnectionState.Closed
|
|
untrackCounter(HttpClientConnectionTrackerName)
|
|
|
|
proc connect(session: HttpSessionRef,
|
|
ha: HttpAddress): Future[HttpClientConnectionRef] {.async.} =
|
|
## Establish new connection with remote server using ``url`` and ``flags``.
|
|
## On success returns ``HttpClientConnectionRef`` object.
|
|
var lastError = ""
|
|
# Here we trying to connect to every possible remote host address we got after
|
|
# DNS resolution.
|
|
for address in ha.addresses:
|
|
let transp =
|
|
try:
|
|
await connect(address, bufferSize = session.connectionBufferSize,
|
|
flags = session.socketFlags)
|
|
except CancelledError as exc:
|
|
raise exc
|
|
except CatchableError:
|
|
nil
|
|
if not(isNil(transp)):
|
|
let conn =
|
|
block:
|
|
let res = HttpClientConnectionRef.new(session, ha, transp)
|
|
if res.kind == HttpClientScheme.Secure:
|
|
try:
|
|
await res.tls.handshake()
|
|
res.state = HttpClientConnectionState.Ready
|
|
except CancelledError as exc:
|
|
await res.closeWait()
|
|
raise exc
|
|
except TLSStreamProtocolError as exc:
|
|
await res.closeWait()
|
|
res.state = HttpClientConnectionState.Error
|
|
lastError = $exc.msg
|
|
except AsyncStreamError as exc:
|
|
await res.closeWait()
|
|
res.state = HttpClientConnectionState.Error
|
|
lastError = $exc.msg
|
|
else:
|
|
res.state = HttpClientConnectionState.Ready
|
|
res
|
|
if conn.state == HttpClientConnectionState.Ready:
|
|
return conn
|
|
|
|
# If all attempts to connect to the remote host have failed.
|
|
if len(lastError) > 0:
|
|
raiseHttpConnectionError("Could not connect to remote host, reason: " &
|
|
lastError)
|
|
else:
|
|
raiseHttpConnectionError("Could not connect to remote host")
|
|
|
|
proc removeConnection(session: HttpSessionRef,
|
|
conn: HttpClientConnectionRef) {.async.} =
|
|
let removeHost =
|
|
block:
|
|
var res = false
|
|
session.connections.withValue(conn.remoteHostname, connections):
|
|
connections[].keepItIf(it != conn)
|
|
if len(connections[]) == 0:
|
|
res = true
|
|
res
|
|
if removeHost:
|
|
session.connections.del(conn.remoteHostname)
|
|
dec(session.connectionsCount)
|
|
await conn.closeWait()
|
|
|
|
func connectionPoolEnabled(session: HttpSessionRef,
|
|
flags: set[HttpClientRequestFlag]): bool =
|
|
(HttpClientFlag.NewConnectionAlways notin session.flags) and
|
|
(HttpClientRequestFlag.DedicatedConnection notin flags) and
|
|
(HttpClientFlag.Http11Pipeline in session.flags)
|
|
|
|
proc acquireConnection(
|
|
session: HttpSessionRef,
|
|
ha: HttpAddress,
|
|
flags: set[HttpClientRequestFlag]
|
|
): Future[HttpClientConnectionRef] {.async.} =
|
|
## Obtain connection from ``session`` or establish a new one.
|
|
var default: seq[HttpClientConnectionRef]
|
|
let timestamp = Moment.now()
|
|
if session.connectionPoolEnabled(flags):
|
|
# Trying to reuse existing connection from our connection's pool.
|
|
# We looking for non-idle connection at `Ready` state, all idle connections
|
|
# will be freed by sessionWatcher().
|
|
for connection in session.connections.getOrDefault(ha.id):
|
|
if connection.isReady() and
|
|
not(connection.isIdle(timestamp, session.idleTimeout)):
|
|
connection.state = HttpClientConnectionState.Acquired
|
|
return connection
|
|
|
|
let connection =
|
|
try:
|
|
await session.connect(ha).wait(session.connectTimeout)
|
|
except AsyncTimeoutError:
|
|
raiseHttpConnectionError("Connection timed out")
|
|
connection.state = HttpClientConnectionState.Acquired
|
|
session.connections.mgetOrPut(ha.id, default).add(connection)
|
|
inc(session.connectionsCount)
|
|
connection.setTimestamp(timestamp)
|
|
connection.setDuration()
|
|
return connection
|
|
|
|
proc releaseConnection(session: HttpSessionRef,
|
|
connection: HttpClientConnectionRef) {.async.} =
|
|
## Return connection back to the ``session``.
|
|
let removeConnection =
|
|
if HttpClientFlag.Http11Pipeline notin session.flags:
|
|
true
|
|
else:
|
|
case connection.state
|
|
of HttpClientConnectionState.ResponseBodyReceived:
|
|
if HttpClientConnectionFlag.KeepAlive in connection.flags:
|
|
# HTTP response body has been received and "Connection: keep-alive" is
|
|
# present in response headers.
|
|
false
|
|
else:
|
|
# HTTP response body has been received, but "Connection: keep-alive"
|
|
# is not present or not supported.
|
|
true
|
|
of HttpClientConnectionState.ResponseHeadersReceived:
|
|
if (HttpClientConnectionFlag.NoBody in connection.flags) and
|
|
(HttpClientConnectionFlag.KeepAlive in connection.flags):
|
|
# HTTP response headers received with an empty response body and
|
|
# "Connection: keep-alive" is present in response headers.
|
|
false
|
|
else:
|
|
# HTTP response body is not received or "Connection: keep-alive" is
|
|
# not present or not supported.
|
|
true
|
|
else:
|
|
# Connection not in proper state.
|
|
true
|
|
|
|
if removeConnection:
|
|
await session.removeConnection(connection)
|
|
else:
|
|
connection.state = HttpClientConnectionState.Ready
|
|
connection.flags.excl({HttpClientConnectionFlag.Request,
|
|
HttpClientConnectionFlag.Response,
|
|
HttpClientConnectionFlag.NoBody})
|
|
|
|
proc releaseConnection(request: HttpClientRequestRef) {.async.} =
|
|
let
|
|
session = request.session
|
|
connection = request.connection
|
|
|
|
if not(isNil(connection)):
|
|
request.connection = nil
|
|
request.session = nil
|
|
connection.flags.excl(HttpClientConnectionFlag.Request)
|
|
if HttpClientConnectionFlag.Response notin connection.flags:
|
|
await session.releaseConnection(connection)
|
|
|
|
proc releaseConnection(response: HttpClientResponseRef) {.async.} =
|
|
let
|
|
session = response.session
|
|
connection = response.connection
|
|
|
|
if not(isNil(connection)):
|
|
response.connection = nil
|
|
response.session = nil
|
|
connection.flags.excl(HttpClientConnectionFlag.Response)
|
|
if HttpClientConnectionFlag.Request notin connection.flags:
|
|
await session.releaseConnection(connection)
|
|
|
|
proc closeWait*(session: HttpSessionRef) {.async.} =
|
|
## Closes HTTP session object.
|
|
##
|
|
## This closes all the connections opened to remote servers.
|
|
var pending: seq[Future[void]]
|
|
# Closing sessionWatcher to avoid race condition.
|
|
if not(isNil(session.watcherFut)):
|
|
await cancelAndWait(session.watcherFut)
|
|
for connections in session.connections.values():
|
|
for conn in connections:
|
|
pending.add(closeWait(conn))
|
|
await noCancel(allFutures(pending))
|
|
|
|
proc sessionWatcher(session: HttpSessionRef) {.async.} =
|
|
while true:
|
|
let firstBreak =
|
|
try:
|
|
await sleepAsync(session.idlePeriod)
|
|
false
|
|
except CancelledError:
|
|
true
|
|
|
|
if firstBreak:
|
|
break
|
|
|
|
var idleConnections: seq[HttpClientConnectionRef]
|
|
let timestamp = Moment.now()
|
|
for _, connections in session.connections.mpairs():
|
|
connections.keepItIf(
|
|
if isNil(it):
|
|
false
|
|
else:
|
|
if it.isReady() and it.isIdle(timestamp, session.idleTimeout):
|
|
idleConnections.add(it)
|
|
false
|
|
else:
|
|
true
|
|
)
|
|
|
|
if len(idleConnections) > 0:
|
|
dec(session.connectionsCount, len(idleConnections))
|
|
var pending: seq[Future[void]]
|
|
let secondBreak =
|
|
try:
|
|
pending = idleConnections.mapIt(it.closeWait())
|
|
await allFutures(pending)
|
|
false
|
|
except CancelledError:
|
|
# We still want to close connections to avoid socket leaks.
|
|
await allFutures(pending)
|
|
true
|
|
|
|
if secondBreak:
|
|
break
|
|
|
|
proc closeWait*(request: HttpClientRequestRef) {.async.} =
|
|
var pending: seq[FutureBase]
|
|
if request.state notin {HttpReqRespState.Closing, HttpReqRespState.Closed}:
|
|
request.state = HttpReqRespState.Closing
|
|
if not(isNil(request.writer)):
|
|
if not(request.writer.closed()):
|
|
pending.add(FutureBase(request.writer.closeWait()))
|
|
request.writer = nil
|
|
pending.add(FutureBase(request.releaseConnection()))
|
|
await noCancel(allFutures(pending))
|
|
request.session = nil
|
|
request.error = nil
|
|
request.state = HttpReqRespState.Closed
|
|
untrackCounter(HttpClientRequestTrackerName)
|
|
|
|
proc closeWait*(response: HttpClientResponseRef) {.async.} =
|
|
var pending: seq[FutureBase]
|
|
if response.state notin {HttpReqRespState.Closing, HttpReqRespState.Closed}:
|
|
response.state = HttpReqRespState.Closing
|
|
if not(isNil(response.reader)):
|
|
if not(response.reader.closed()):
|
|
pending.add(FutureBase(response.reader.closeWait()))
|
|
response.reader = nil
|
|
pending.add(FutureBase(response.releaseConnection()))
|
|
await noCancel(allFutures(pending))
|
|
response.session = nil
|
|
response.error = nil
|
|
response.state = HttpReqRespState.Closed
|
|
untrackCounter(HttpClientResponseTrackerName)
|
|
|
|
proc prepareResponse(request: HttpClientRequestRef, data: openArray[byte]
|
|
): HttpResult[HttpClientResponseRef] {.raises: [] .} =
|
|
## Process response headers.
|
|
let resp = parseResponse(data, false)
|
|
if resp.failed():
|
|
return err("Invalid headers received")
|
|
|
|
let headers =
|
|
block:
|
|
var res = HttpTable.init()
|
|
for key, value in resp.headers(data):
|
|
res.add(key, value)
|
|
if res.count(ContentTypeHeader) > 1:
|
|
return err("Invalid headers received, too many `Content-Type`")
|
|
if res.count(ContentLengthHeader) > 1:
|
|
return err("Invalid headers received, too many `Content-Length`")
|
|
if res.count(TransferEncodingHeader) > 1:
|
|
return err("Invalid headers received, too many `Transfer-Encoding`")
|
|
res
|
|
|
|
# Preprocessing "Content-Encoding" header.
|
|
let contentEncoding =
|
|
block:
|
|
let res = getContentEncoding(headers.getList(ContentEncodingHeader))
|
|
if res.isErr():
|
|
return err("Invalid headers received, invalid `Content-Encoding`")
|
|
else:
|
|
res.get()
|
|
|
|
# Preprocessing "Transfer-Encoding" header.
|
|
let transferEncoding =
|
|
block:
|
|
let res = getTransferEncoding(headers.getList(TransferEncodingHeader))
|
|
if res.isErr():
|
|
return err("Invalid headers received, invalid `Transfer-Encoding`")
|
|
else:
|
|
res.get()
|
|
|
|
# Preprocessing "Content-Length" header.
|
|
let (contentLength, bodyFlag, nobodyFlag) =
|
|
if ContentLengthHeader in headers:
|
|
let length = headers.getInt(ContentLengthHeader)
|
|
(length, HttpClientBodyFlag.Sized, length == 0)
|
|
else:
|
|
if TransferEncodingFlags.Chunked in transferEncoding:
|
|
(0'u64, HttpClientBodyFlag.Chunked, false)
|
|
else:
|
|
(0'u64, HttpClientBodyFlag.Custom, false)
|
|
|
|
# Preprocessing "Connection" header.
|
|
let connectionFlag =
|
|
block:
|
|
case resp.version
|
|
of HttpVersion11:
|
|
# Keeping a connection open is the default on HTTP/1.1 requests.
|
|
# https://www.rfc-editor.org/rfc/rfc2068.html#section-19.7.1
|
|
let header = toLowerAscii(headers.getString(ConnectionHeader))
|
|
if header == "close":
|
|
false
|
|
else:
|
|
true
|
|
of HttpVersion10:
|
|
# This is the default on HTTP/1.0 requests.
|
|
false
|
|
else:
|
|
# HTTP/2 does not use the Connection header field (Section 7.6.1 of
|
|
# [HTTP]) to indicate connection-specific header fields.
|
|
# https://httpwg.org/specs/rfc9113.html#rfc.section.8.2.2
|
|
#
|
|
# HTTP/3 does not use the Connection header field to indicate
|
|
# connection-specific fields;
|
|
# https://httpwg.org/specs/rfc9114.html#rfc.section.4.2
|
|
true
|
|
|
|
let contentType =
|
|
block:
|
|
let list = headers.getList(ContentTypeHeader)
|
|
if len(list) > 0:
|
|
let res = getContentType(list)
|
|
if res.isErr():
|
|
return err("Invalid headers received, invalid `Content-Type`")
|
|
else:
|
|
Opt.some(res.get())
|
|
else:
|
|
Opt.none(ContentTypeData)
|
|
|
|
let res = HttpClientResponseRef(
|
|
state: HttpReqRespState.Open, status: resp.code,
|
|
address: request.address, requestMethod: request.meth,
|
|
reason: resp.reason(data), version: resp.version, session: request.session,
|
|
connection: request.connection, headers: headers,
|
|
contentEncoding: contentEncoding, transferEncoding: transferEncoding,
|
|
contentLength: contentLength, contentType: contentType, bodyFlag: bodyFlag
|
|
)
|
|
res.connection.state = HttpClientConnectionState.ResponseHeadersReceived
|
|
if nobodyFlag:
|
|
res.connection.flags.incl(HttpClientConnectionFlag.NoBody)
|
|
let
|
|
newConnectionAlways =
|
|
HttpClientFlag.NewConnectionAlways in request.session.flags
|
|
httpPipeline =
|
|
HttpClientFlag.Http11Pipeline in request.session.flags
|
|
closeConnection =
|
|
HttpClientRequestFlag.CloseConnection in request.flags
|
|
if connectionFlag and not(newConnectionAlways) and not(closeConnection) and
|
|
httpPipeline:
|
|
res.connection.flags.incl(HttpClientConnectionFlag.KeepAlive)
|
|
res.connection.flags.incl(HttpClientConnectionFlag.Response)
|
|
trackCounter(HttpClientResponseTrackerName)
|
|
ok(res)
|
|
|
|
proc getResponse(req: HttpClientRequestRef): Future[HttpClientResponseRef] {.
|
|
async.} =
|
|
var buffer: array[HttpMaxHeadersSize, byte]
|
|
let timestamp = Moment.now()
|
|
req.connection.setTimestamp(timestamp)
|
|
let
|
|
bytesRead =
|
|
try:
|
|
await req.connection.reader.readUntil(addr buffer[0],
|
|
len(buffer), HeadersMark).wait(
|
|
req.session.headersTimeout)
|
|
except AsyncTimeoutError:
|
|
raiseHttpReadError("Reading response headers timed out")
|
|
except AsyncStreamError:
|
|
raiseHttpReadError("Could not read response headers")
|
|
|
|
let response = prepareResponse(req, buffer.toOpenArray(0, bytesRead - 1))
|
|
if response.isErr():
|
|
raiseHttpProtocolError(response.error())
|
|
let res = response.get()
|
|
res.setTimestamp(timestamp)
|
|
return res
|
|
|
|
proc new*(t: typedesc[HttpClientRequestRef], session: HttpSessionRef,
|
|
ha: HttpAddress, meth: HttpMethod = MethodGet,
|
|
version: HttpVersion = HttpVersion11,
|
|
flags: set[HttpClientRequestFlag] = {},
|
|
headers: openArray[HttpHeaderTuple] = [],
|
|
body: openArray[byte] = []): HttpClientRequestRef {.
|
|
raises: [].} =
|
|
let res = HttpClientRequestRef(
|
|
state: HttpReqRespState.Ready, session: session, meth: meth,
|
|
version: version, flags: flags, headers: HttpTable.init(headers),
|
|
address: ha, bodyFlag: HttpClientBodyFlag.Custom, buffer: @body
|
|
)
|
|
trackCounter(HttpClientRequestTrackerName)
|
|
res
|
|
|
|
proc new*(t: typedesc[HttpClientRequestRef], session: HttpSessionRef,
|
|
url: string, meth: HttpMethod = MethodGet,
|
|
version: HttpVersion = HttpVersion11,
|
|
flags: set[HttpClientRequestFlag] = {},
|
|
headers: openArray[HttpHeaderTuple] = [],
|
|
body: openArray[byte] = []): HttpResult[HttpClientRequestRef] {.
|
|
raises: [].} =
|
|
let address = ? session.getAddress(parseUri(url))
|
|
let res = HttpClientRequestRef(
|
|
state: HttpReqRespState.Ready, session: session, meth: meth,
|
|
version: version, flags: flags, headers: HttpTable.init(headers),
|
|
address: address, bodyFlag: HttpClientBodyFlag.Custom, buffer: @body
|
|
)
|
|
trackCounter(HttpClientRequestTrackerName)
|
|
ok(res)
|
|
|
|
proc get*(t: typedesc[HttpClientRequestRef], session: HttpSessionRef,
|
|
url: string, version: HttpVersion = HttpVersion11,
|
|
flags: set[HttpClientRequestFlag] = {},
|
|
headers: openArray[HttpHeaderTuple] = []
|
|
): HttpResult[HttpClientRequestRef] {.raises: [].} =
|
|
HttpClientRequestRef.new(session, url, MethodGet, version, flags, headers)
|
|
|
|
proc get*(t: typedesc[HttpClientRequestRef], session: HttpSessionRef,
|
|
ha: HttpAddress, version: HttpVersion = HttpVersion11,
|
|
flags: set[HttpClientRequestFlag] = {},
|
|
headers: openArray[HttpHeaderTuple] = []
|
|
): HttpClientRequestRef {.raises: [].} =
|
|
HttpClientRequestRef.new(session, ha, MethodGet, version, flags, headers)
|
|
|
|
proc post*(t: typedesc[HttpClientRequestRef], session: HttpSessionRef,
|
|
url: string, version: HttpVersion = HttpVersion11,
|
|
flags: set[HttpClientRequestFlag] = {},
|
|
headers: openArray[HttpHeaderTuple] = [],
|
|
body: openArray[byte] = []
|
|
): HttpResult[HttpClientRequestRef] {.raises: [].} =
|
|
HttpClientRequestRef.new(session, url, MethodPost, version, flags, headers,
|
|
body)
|
|
|
|
proc post*(t: typedesc[HttpClientRequestRef], session: HttpSessionRef,
|
|
url: string, version: HttpVersion = HttpVersion11,
|
|
flags: set[HttpClientRequestFlag] = {},
|
|
headers: openArray[HttpHeaderTuple] = [],
|
|
body: openArray[char] = []): HttpResult[HttpClientRequestRef] {.
|
|
raises: [].} =
|
|
HttpClientRequestRef.new(session, url, MethodPost, version, flags, headers,
|
|
body.toOpenArrayByte(0, len(body) - 1))
|
|
|
|
proc post*(t: typedesc[HttpClientRequestRef], session: HttpSessionRef,
|
|
ha: HttpAddress, version: HttpVersion = HttpVersion11,
|
|
flags: set[HttpClientRequestFlag] = {},
|
|
headers: openArray[HttpHeaderTuple] = [],
|
|
body: openArray[byte] = []): HttpClientRequestRef {.
|
|
raises: [].} =
|
|
HttpClientRequestRef.new(session, ha, MethodPost, version, flags, headers,
|
|
body)
|
|
|
|
proc post*(t: typedesc[HttpClientRequestRef], session: HttpSessionRef,
|
|
ha: HttpAddress, version: HttpVersion = HttpVersion11,
|
|
flags: set[HttpClientRequestFlag] = {},
|
|
headers: openArray[HttpHeaderTuple] = [],
|
|
body: openArray[char] = []): HttpClientRequestRef {.
|
|
raises: [].} =
|
|
HttpClientRequestRef.new(session, ha, MethodPost, version, flags, headers,
|
|
body.toOpenArrayByte(0, len(body) - 1))
|
|
|
|
proc prepareRequest(request: HttpClientRequestRef): string {.
|
|
raises: [].} =
|
|
template hasChunkedEncoding(request: HttpClientRequestRef): bool =
|
|
toLowerAscii(request.headers.getString(TransferEncodingHeader)) == "chunked"
|
|
|
|
# We use ChronosIdent as `User-Agent` string if its not set.
|
|
discard request.headers.hasKeyOrPut(UserAgentHeader, ChronosIdent)
|
|
# We use request's hostname as `Host` string if its not set.
|
|
discard request.headers.hasKeyOrPut(HostHeader, request.address.hostname)
|
|
# We set `Connection` to value according to flags if its not set.
|
|
if ConnectionHeader notin request.headers:
|
|
if (HttpClientFlag.Http11Pipeline notin request.session.flags) or
|
|
(HttpClientRequestFlag.CloseConnection in request.flags):
|
|
request.headers.add(ConnectionHeader, "close")
|
|
else:
|
|
request.headers.add(ConnectionHeader, "keep-alive")
|
|
# We set `Accept` to accept any content if its not set.
|
|
discard request.headers.hasKeyOrPut(AcceptHeaderName, "*/*")
|
|
|
|
# We will send `Authorization` information only if username or password set,
|
|
# and `Authorization` header is not present in request's headers.
|
|
if len(request.address.username) > 0 or len(request.address.password) > 0:
|
|
if AuthorizationHeader notin request.headers:
|
|
let auth = request.address.username & ":" & request.address.password
|
|
let header = "Basic " &
|
|
Base64Pad.encode(auth.toOpenArrayByte(0, len(auth) - 1))
|
|
request.headers.add(AuthorizationHeader, header)
|
|
|
|
# Here we perform automatic detection: if request was created with non-zero
|
|
# body and `Content-Length` header is missing we will create one with size
|
|
# of body stored in request.
|
|
if ContentLengthHeader notin request.headers:
|
|
if len(request.buffer) > 0:
|
|
let slength = Base10.toString(uint64(len(request.buffer)))
|
|
request.headers.add(ContentLengthHeader, slength)
|
|
|
|
request.bodyFlag =
|
|
if ContentLengthHeader in request.headers:
|
|
HttpClientBodyFlag.Sized
|
|
else:
|
|
if request.hasChunkedEncoding():
|
|
HttpClientBodyFlag.Chunked
|
|
else:
|
|
HttpClientBodyFlag.Custom
|
|
|
|
let entity =
|
|
block:
|
|
var res =
|
|
if len(request.address.path) > 0:
|
|
request.address.path
|
|
else:
|
|
"/"
|
|
if len(request.address.query) > 0:
|
|
res.add("?")
|
|
res.add(request.address.query)
|
|
if len(request.address.anchor) > 0:
|
|
res.add("#")
|
|
res.add(request.address.anchor)
|
|
res
|
|
|
|
var res = $request.meth
|
|
res.add(" ")
|
|
res.add(entity)
|
|
res.add(" ")
|
|
res.add($request.version)
|
|
res.add("\r\n")
|
|
for k, v in request.headers.stringItems():
|
|
if len(v) > 0:
|
|
res.add(normalizeHeaderName(k))
|
|
res.add(": ")
|
|
res.add(v)
|
|
res.add("\r\n")
|
|
res.add("\r\n")
|
|
res
|
|
|
|
proc send*(request: HttpClientRequestRef): Future[HttpClientResponseRef] {.
|
|
async.} =
|
|
doAssert(request.state == HttpReqRespState.Ready,
|
|
"Request's state is " & $request.state)
|
|
let connection =
|
|
try:
|
|
await request.session.acquireConnection(request.address, request.flags)
|
|
except CancelledError as exc:
|
|
request.setError(newHttpInterruptError())
|
|
raise exc
|
|
except HttpError as exc:
|
|
request.setError(exc)
|
|
raise exc
|
|
|
|
connection.flags.incl(HttpClientConnectionFlag.Request)
|
|
request.connection = connection
|
|
|
|
try:
|
|
let headers = request.prepareRequest()
|
|
request.connection.state = HttpClientConnectionState.RequestHeadersSending
|
|
request.state = HttpReqRespState.Open
|
|
request.setTimestamp()
|
|
await request.connection.writer.write(headers)
|
|
request.connection.state = HttpClientConnectionState.RequestHeadersSent
|
|
request.connection.state = HttpClientConnectionState.RequestBodySending
|
|
if len(request.buffer) > 0:
|
|
await request.connection.writer.write(request.buffer)
|
|
request.connection.state = HttpClientConnectionState.RequestBodySent
|
|
request.state = HttpReqRespState.Finished
|
|
request.setDuration()
|
|
except CancelledError as exc:
|
|
request.setDuration()
|
|
request.setError(newHttpInterruptError())
|
|
raise exc
|
|
except AsyncStreamError:
|
|
request.setDuration()
|
|
let error = newHttpWriteError("Could not send request headers")
|
|
request.setError(error)
|
|
raise error
|
|
|
|
let resp =
|
|
try:
|
|
await request.getResponse()
|
|
except CancelledError as exc:
|
|
request.setError(newHttpInterruptError())
|
|
raise exc
|
|
except HttpError as exc:
|
|
request.setError(exc)
|
|
raise exc
|
|
return resp
|
|
|
|
proc open*(request: HttpClientRequestRef): Future[HttpBodyWriter] {.
|
|
async.} =
|
|
## Start sending request's headers and return `HttpBodyWriter`, which can be
|
|
## used to send request's body.
|
|
doAssert(request.state == HttpReqRespState.Ready,
|
|
"Request's state is " & $request.state)
|
|
doAssert(len(request.buffer) == 0,
|
|
"Request should not have static body content (len(buffer) == 0)")
|
|
let connection =
|
|
try:
|
|
await request.session.acquireConnection(request.address, request.flags)
|
|
except CancelledError as exc:
|
|
request.setError(newHttpInterruptError())
|
|
raise exc
|
|
except HttpError as exc:
|
|
request.setError(exc)
|
|
raise exc
|
|
|
|
connection.flags.incl(HttpClientConnectionFlag.Request)
|
|
request.connection = connection
|
|
|
|
try:
|
|
let headers = request.prepareRequest()
|
|
request.connection.state = HttpClientConnectionState.RequestHeadersSending
|
|
request.setTimestamp()
|
|
await request.connection.writer.write(headers)
|
|
request.connection.state = HttpClientConnectionState.RequestHeadersSent
|
|
except CancelledError as exc:
|
|
request.setDuration()
|
|
request.setError(newHttpInterruptError())
|
|
raise exc
|
|
except AsyncStreamError:
|
|
let error = newHttpWriteError("Could not send request headers")
|
|
request.setDuration()
|
|
request.setError(error)
|
|
raise error
|
|
|
|
let writer =
|
|
case request.bodyFlag
|
|
of HttpClientBodyFlag.Sized:
|
|
let size = Base10.decode(uint64,
|
|
request.headers.getString("content-length"))
|
|
let writer = newBoundedStreamWriter(request.connection.writer, size.get())
|
|
newHttpBodyWriter([AsyncStreamWriter(writer)])
|
|
of HttpClientBodyFlag.Chunked:
|
|
let writer = newChunkedStreamWriter(request.connection.writer)
|
|
newHttpBodyWriter([AsyncStreamWriter(writer)])
|
|
of HttpClientBodyFlag.Custom:
|
|
let writer = newAsyncStreamWriter(request.connection.writer)
|
|
newHttpBodyWriter([writer])
|
|
|
|
request.writer = writer
|
|
request.state = HttpReqRespState.Open
|
|
request.connection.state = HttpClientConnectionState.RequestBodySending
|
|
return writer
|
|
|
|
proc finish*(request: HttpClientRequestRef): Future[HttpClientResponseRef] {.
|
|
async.} =
|
|
## Finish sending request and receive response.
|
|
doAssert(not(isNil(request.connection)),
|
|
"Request missing connection instance")
|
|
request.checkClosed()
|
|
doAssert(request.state == HttpReqRespState.Open,
|
|
"Request's state is " & $request.state)
|
|
doAssert(request.connection.state ==
|
|
HttpClientConnectionState.RequestBodySending,
|
|
"Connection's state is " & $request.connection.state)
|
|
doAssert(request.writer.closed(),
|
|
"Body writer instance must be closed before finish(request) call")
|
|
request.state = HttpReqRespState.Finished
|
|
request.connection.state = HttpClientConnectionState.RequestBodySent
|
|
request.setDuration()
|
|
let response =
|
|
try:
|
|
await request.getResponse()
|
|
except CancelledError as exc:
|
|
request.setError(newHttpInterruptError())
|
|
raise exc
|
|
except HttpError as exc:
|
|
request.setError(exc)
|
|
raise exc
|
|
return response
|
|
|
|
proc getNewLocation*(resp: HttpClientResponseRef): HttpResult[HttpAddress] =
|
|
## Returns new address according to response's `Location` header value.
|
|
if "location" in resp.headers:
|
|
let location = resp.headers.getString("location")
|
|
if len(location) > 0:
|
|
resp.session.redirect(resp.address, parseUri(location))
|
|
else:
|
|
err("Location header with empty value")
|
|
else:
|
|
err("Location header is missing")
|
|
|
|
proc getBodyReader*(response: HttpClientResponseRef): HttpBodyReader =
|
|
## Returns stream's reader instance which can be used to read response's body.
|
|
##
|
|
## Streams which was obtained using this procedure must be closed to avoid
|
|
## leaks.
|
|
doAssert(not(isNil(response.connection)),
|
|
"Response missing connection instance")
|
|
response.checkClosed()
|
|
doAssert(response.state == HttpReqRespState.Open,
|
|
"Response's state is " & $response.state)
|
|
doAssert(response.connection.state in
|
|
{HttpClientConnectionState.ResponseHeadersReceived,
|
|
HttpClientConnectionState.ResponseBodyReceiving},
|
|
"Connection state is " & $response.connection.state)
|
|
if isNil(response.reader):
|
|
let reader =
|
|
case response.bodyFlag
|
|
of HttpClientBodyFlag.Sized:
|
|
let bstream = newBoundedStreamReader(response.connection.reader,
|
|
response.contentLength)
|
|
newHttpBodyReader(bstream)
|
|
of HttpClientBodyFlag.Chunked:
|
|
newHttpBodyReader(newChunkedStreamReader(response.connection.reader))
|
|
of HttpClientBodyFlag.Custom:
|
|
newHttpBodyReader(newAsyncStreamReader(response.connection.reader))
|
|
response.connection.state = HttpClientConnectionState.ResponseBodyReceiving
|
|
response.reader = reader
|
|
response.reader
|
|
|
|
proc finish*(response: HttpClientResponseRef) {.async.} =
|
|
## Finish receiving response.
|
|
##
|
|
## Because ``finish()`` returns nothing, this operation become NOP for
|
|
## response which is not in ``Open`` state.
|
|
if response.state == HttpReqRespState.Open:
|
|
doAssert(not(isNil(response.connection)),
|
|
"Response missing connection instance")
|
|
response.checkClosed()
|
|
doAssert(response.connection.state ==
|
|
HttpClientConnectionState.ResponseBodyReceiving,
|
|
"Connection state is " & $response.connection.state)
|
|
doAssert(response.reader.closed(),
|
|
"Body reader instance must be closed before finish(response) call")
|
|
response.connection.state = HttpClientConnectionState.ResponseBodyReceived
|
|
response.state = HttpReqRespState.Finished
|
|
response.setDuration()
|
|
|
|
proc getBodyBytes*(response: HttpClientResponseRef): Future[seq[byte]] {.
|
|
async.} =
|
|
## Read all bytes from response ``response``.
|
|
##
|
|
## Note: This procedure performs automatic finishing for ``response``.
|
|
var reader = response.getBodyReader()
|
|
try:
|
|
let data = await reader.read()
|
|
await reader.closeWait()
|
|
reader = nil
|
|
await response.finish()
|
|
return data
|
|
except CancelledError as exc:
|
|
if not(isNil(reader)):
|
|
await reader.closeWait()
|
|
response.setError(newHttpInterruptError())
|
|
raise exc
|
|
except AsyncStreamError:
|
|
if not(isNil(reader)):
|
|
await reader.closeWait()
|
|
let error = newHttpReadError("Could not read response")
|
|
response.setError(error)
|
|
raise error
|
|
|
|
proc getBodyBytes*(response: HttpClientResponseRef,
|
|
nbytes: int): Future[seq[byte]] {.async.} =
|
|
## Read all bytes (nbytes <= 0) or exactly `nbytes` bytes from response
|
|
## ``response``.
|
|
##
|
|
## Note: This procedure performs automatic finishing for ``response``.
|
|
var reader = response.getBodyReader()
|
|
try:
|
|
let data = await reader.read(nbytes)
|
|
await reader.closeWait()
|
|
reader = nil
|
|
await response.finish()
|
|
return data
|
|
except CancelledError as exc:
|
|
if not(isNil(reader)):
|
|
await reader.closeWait()
|
|
response.setError(newHttpInterruptError())
|
|
raise exc
|
|
except AsyncStreamError:
|
|
if not(isNil(reader)):
|
|
await reader.closeWait()
|
|
let error = newHttpReadError("Could not read response")
|
|
response.setError(error)
|
|
raise error
|
|
|
|
proc consumeBody*(response: HttpClientResponseRef): Future[int] {.async.} =
|
|
## Consume/discard response and return number of bytes consumed.
|
|
##
|
|
## Note: This procedure performs automatic finishing for ``response``.
|
|
var reader = response.getBodyReader()
|
|
try:
|
|
let res = await reader.consume()
|
|
await reader.closeWait()
|
|
reader = nil
|
|
await response.finish()
|
|
return res
|
|
except CancelledError as exc:
|
|
if not(isNil(reader)):
|
|
await reader.closeWait()
|
|
response.setError(newHttpInterruptError())
|
|
raise exc
|
|
except AsyncStreamError:
|
|
if not(isNil(reader)):
|
|
await reader.closeWait()
|
|
let error = newHttpReadError("Could not read response")
|
|
response.setError(error)
|
|
raise error
|
|
|
|
proc redirect*(request: HttpClientRequestRef,
|
|
ha: HttpAddress): HttpResult[HttpClientRequestRef] =
|
|
## Create new request object using original request object ``request`` and
|
|
## new redirected address ``ha``.
|
|
##
|
|
## This procedure could return an error if number of redirects exceeded
|
|
## maximum allowed number of redirects in request's session.
|
|
let redirectCount = request.redirectCount + 1
|
|
if redirectCount > request.session.maxRedirections:
|
|
err("Maximum number of redirects exceeded")
|
|
else:
|
|
let headers =
|
|
block:
|
|
var res = request.headers
|
|
res.set(HostHeader, ha.hostname)
|
|
res
|
|
var res = HttpClientRequestRef.new(request.session, ha, request.meth,
|
|
request.version, request.flags, headers.toList(), request.buffer)
|
|
res.redirectCount = redirectCount
|
|
ok(res)
|
|
|
|
proc redirect*(request: HttpClientRequestRef,
|
|
uri: Uri): HttpResult[HttpClientRequestRef] =
|
|
## Create new request object using original request object ``request`` and
|
|
## redirected URL ``uri``.
|
|
##
|
|
## This procedure could return an error if number of redirects exceeded
|
|
## maximum allowed number of redirects in request's session or ``uri`` is
|
|
## incorrect or not supported.
|
|
let redirectCount = request.redirectCount + 1
|
|
if redirectCount > request.session.maxRedirections:
|
|
err("Maximum number of redirects exceeded")
|
|
else:
|
|
let address = ? request.session.redirect(request.address, uri)
|
|
# Update Host header to redirected URL hostname
|
|
let headers =
|
|
block:
|
|
var res = request.headers
|
|
res.set(HostHeader, address.hostname)
|
|
res
|
|
var res = HttpClientRequestRef.new(request.session, address, request.meth,
|
|
request.version, request.flags, headers.toList(), request.buffer)
|
|
res.redirectCount = redirectCount
|
|
ok(res)
|
|
|
|
proc fetch*(request: HttpClientRequestRef): Future[HttpResponseTuple] {.
|
|
async.} =
|
|
var response: HttpClientResponseRef
|
|
try:
|
|
response = await request.send()
|
|
let buffer = await response.getBodyBytes()
|
|
let status = response.status
|
|
await response.closeWait()
|
|
response = nil
|
|
return (status, buffer)
|
|
except HttpError as exc:
|
|
if not(isNil(response)): await response.closeWait()
|
|
raise exc
|
|
except CancelledError as exc:
|
|
if not(isNil(response)): await response.closeWait()
|
|
raise exc
|
|
|
|
proc fetch*(session: HttpSessionRef, url: Uri): Future[HttpResponseTuple] {.
|
|
async.} =
|
|
## Fetch resource pointed by ``url`` using HTTP GET method and ``session``
|
|
## parameters.
|
|
##
|
|
## This procedure supports HTTP redirections.
|
|
let address =
|
|
block:
|
|
let res = session.getAddress(url)
|
|
if res.isErr():
|
|
raiseHttpAddressError(res.error())
|
|
res.get()
|
|
|
|
var
|
|
request = HttpClientRequestRef.new(session, address)
|
|
response: HttpClientResponseRef = nil
|
|
redirect: HttpClientRequestRef = nil
|
|
|
|
while true:
|
|
try:
|
|
response = await request.send()
|
|
if response.status >= 300 and response.status < 400:
|
|
redirect =
|
|
block:
|
|
if "location" in response.headers:
|
|
let location = response.headers.getString("location")
|
|
if len(location) > 0:
|
|
let res = request.redirect(parseUri(location))
|
|
if res.isErr():
|
|
raiseHttpRedirectError(res.error())
|
|
res.get()
|
|
else:
|
|
raiseHttpRedirectError("Location header with an empty value")
|
|
else:
|
|
raiseHttpRedirectError("Location header missing")
|
|
discard await response.consumeBody()
|
|
await response.closeWait()
|
|
response = nil
|
|
await request.closeWait()
|
|
request = nil
|
|
request = redirect
|
|
redirect = nil
|
|
else:
|
|
let data = await response.getBodyBytes()
|
|
let code = response.status
|
|
await response.closeWait()
|
|
response = nil
|
|
await request.closeWait()
|
|
request = nil
|
|
return (code, data)
|
|
except CancelledError as exc:
|
|
if not(isNil(response)): await closeWait(response)
|
|
if not(isNil(request)): await closeWait(request)
|
|
if not(isNil(redirect)): await closeWait(redirect)
|
|
raise exc
|
|
except HttpError as exc:
|
|
if not(isNil(response)): await closeWait(response)
|
|
if not(isNil(request)): await closeWait(request)
|
|
if not(isNil(redirect)): await closeWait(redirect)
|
|
raise exc
|
|
|
|
proc getServerSentEvents*(
|
|
response: HttpClientResponseRef,
|
|
maxEventSize: int = -1
|
|
): Future[seq[ServerSentEvent]] {.async.} =
|
|
## Read number of server-sent events (SSE) from HTTP response ``response``.
|
|
##
|
|
## ``maxEventSize`` - maximum size of events chunk in one message, use
|
|
## `-1` or `0` to set size to unlimited.
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##
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## Server-sent events parsing is done according to:
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## https://html.spec.whatwg.org/multipage/server-sent-events.html#parsing-an-event-stream
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##
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## Note: Server-sent event comments are ignored and silently skipped.
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const
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CR = byte(0x0D)
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LF = byte(0x0A)
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COLON = byte(':')
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SPACE = byte(' ')
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let reader = response.getBodyReader()
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var
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error: ref HttpReadError = nil
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res: seq[ServerSentEvent]
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buffer: seq[byte]
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proc consumeBuffer() =
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if len(buffer) == 0: return
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let pos = buffer.find(COLON)
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if pos == 0:
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# comment line
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discard
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elif pos > 0:
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# field_name: field_value
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let
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name = string.fromBytes(buffer.toOpenArray(0, pos - 1))
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value =
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if (pos + 1) < len(buffer):
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let spos = if buffer[pos + 1] == SPACE: pos + 2 else: pos + 1
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string.fromBytes(buffer.toOpenArray(spos, len(buffer) - 1))
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else:
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""
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res.add(ServerSentEvent(name: name, data: value))
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else:
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# field_name only
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let name = string.fromBytes(buffer.toOpenArray(0, len(buffer) - 1))
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res.add(ServerSentEvent(name: name, data: ""))
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|
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# Reset internal buffer to zero length.
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buffer.setLen(0)
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|
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proc discardBuffer() =
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if len(buffer) == 0: return
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# Reset internal buffer to 1 byte length to keep comment sign.
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buffer.setLen(1)
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|
|
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proc predicate(data: openArray[byte]): tuple[consumed: int, done: bool] =
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var i = 0
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while i < len(data):
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if data[i] in {CR, LF}:
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# CR or LF encountered
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inc(i)
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if (data[i - 1] == CR) and ((i < len(data)) and data[i] == LF):
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# We trying to check for CRLF
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inc(i)
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|
|
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if len(buffer) == 0:
|
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if len(res) == 0:
|
|
res.add(ServerSentEvent(name: "", data: ""))
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return (i, true)
|
|
consumeBuffer()
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|
else:
|
|
buffer.add(data[i])
|
|
if (maxEventSize >= 0) and (len(buffer) > maxEventSize):
|
|
if buffer[0] != COLON:
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|
# We only check limits for events and ignore comments size.
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|
error = newException(HttpReadLimitError,
|
|
"Size of event exceeded maximum size")
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|
return (0, true)
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|
discardBuffer()
|
|
|
|
inc(i)
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|
|
|
if len(data) == 0:
|
|
# Stream is at EOF
|
|
consumeBuffer()
|
|
return (0, true)
|
|
|
|
(i, false)
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|
|
|
await reader.readMessage(predicate)
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|
if not isNil(error):
|
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raise error
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|
else:
|
|
return res
|