Use asyncdispatch2 instead of asyncdispatch.
This commit is contained in:
cheatfate
parent
cc44cd257b
commit
cbfe945fff
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@ -1,30 +1,28 @@
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import asyncnet, asyncdispatch, tables, json, macros
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import tables, json, macros
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import asyncdispatch2
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import jsonmarshal
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type
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RpcClient* = ref object
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socket: AsyncSocket
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transp: StreamTransport
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awaiting: Table[string, Future[Response]]
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address: string
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port: Port
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address: TransportAddress
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nextId: int64
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Response* = tuple[error: bool, result: JsonNode]
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proc newRpcClient*(): RpcClient =
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## Creates a new ``RpcClient`` instance.
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RpcClient(
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socket: newAsyncSocket(),
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awaiting: initTable[string, Future[Response]](),
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nextId: 1
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)
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## Creates a new ``RpcClient`` instance.
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result = RpcClient(awaiting: initTable[string, Future[Response]](), nextId: 1)
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proc call*(self: RpcClient, name: string, params: JsonNode): Future[Response] {.async.} =
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proc call*(self: RpcClient, name: string,
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params: JsonNode): Future[Response] {.async.} =
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## Remotely calls the specified RPC method.
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let id = $self.nextId
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self.nextId.inc
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let msg = $ %{"jsonrpc": %"2.0", "method": %name, "params": params, "id": %id} & "\c\l"
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await self.socket.send(msg)
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let msg = $ %{"jsonrpc": %"2.0", "method": %name, "params": params,
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"id": %id} & "\c\l"
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let res = await self.transp.write(msg)
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assert(res == len(msg))
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# completed by processMessage.
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var newFut = newFuture[Response]()
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@ -32,12 +30,17 @@ proc call*(self: RpcClient, name: string, params: JsonNode): Future[Response] {.
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self.awaiting[id] = newFut
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result = await newFut
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macro checkGet(node: JsonNode, fieldName: string, jKind: static[JsonNodeKind]): untyped =
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macro checkGet(node: JsonNode, fieldName: string,
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jKind: static[JsonNodeKind]): untyped =
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let n = genSym(ident = "n") #`node`{`fieldName`}
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result = quote:
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let `n` = `node`{`fieldname`}
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if `n`.isNil: raise newException(ValueError, "Message is missing required field \"" & `fieldName` & "\"")
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if `n`.kind != `jKind`.JsonNodeKind: raise newException(ValueError, "Expected " & $(`jKind`.JsonNodeKind) & ", got " & $`node`[`fieldName`].kind)
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if `n`.isNil:
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raise newException(ValueError,
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"Message is missing required field \"" & `fieldName` & "\"")
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if `n`.kind != `jKind`.JsonNodeKind:
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raise newException(ValueError,
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"Expected " & $(`jKind`.JsonNodeKind) & ", got " & $`node`[`fieldName`].kind)
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case jKind
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of JBool: result.add(quote do: `node`[`fieldName`].getBool)
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of JInt: result.add(quote do: `node`[`fieldName`].getInt)
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@ -48,13 +51,17 @@ macro checkGet(node: JsonNode, fieldName: string, jKind: static[JsonNodeKind]):
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proc processMessage(self: RpcClient, line: string) =
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let node = parseJson(line)
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# TODO: Use more appropriate exception objects
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let version = checkGet(node, "jsonrpc", JString)
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if version != "2.0": raise newException(ValueError, "Unsupported version of JSON, expected 2.0, received \"" & version & "\"")
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if version != "2.0":
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raise newException(ValueError,
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"Unsupported version of JSON, expected 2.0, received \"" & version & "\"")
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let id = checkGet(node, "id", JString)
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if not self.awaiting.hasKey(id): raise newException(ValueError, "Cannot find message id \"" & node["id"].str & "\"")
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if not self.awaiting.hasKey(id):
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raise newException(ValueError,
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"Cannot find message id \"" & node["id"].str & "\"")
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let errorNode = node{"error"}
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if errorNode.isNil or errorNode.kind == JNull:
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@ -72,22 +79,25 @@ proc connect*(self: RpcClient, address: string, port: Port): Future[void]
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proc processData(self: RpcClient) {.async.} =
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while true:
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# read until no data
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let line = await self.socket.recvLine()
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# TODO: we need to limit number of bytes we going to read, without any
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# limits server can fill all memory it can here.
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let line = await self.transp.readLine()
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if line == "":
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# transmission ends
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self.socket.close() # TODO: Do we need to drop/reacquire sockets?
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self.socket = newAsyncSocket()
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self.transp.close()
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break
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processMessage(self, line)
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# async loop reconnection and waiting
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await connect(self, self.address, self.port)
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self.transp = await connect(self.address)
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proc connect*(self: RpcClient, address: string, port: Port) {.async.} =
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await self.socket.connect(address, port)
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self.address = address
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self.port = port
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# TODO: `address` hostname can be resolved to many IP addresses, we are using
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# first one, but maybe it would be better to iterate over all IP addresses
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# and try to establish connection until it will not be established.
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let addresses = resolveTAddress(address & ":" & $int(port))
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self.transp = await connect(addresses[0])
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self.address = addresses[0]
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asyncCheck processData(self)
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proc createRpcProc(procName, parameters, callBody: NimNode): NimNode =
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@ -95,9 +105,12 @@ proc createRpcProc(procName, parameters, callBody: NimNode): NimNode =
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var paramList = newSeq[NimNode]()
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for p in parameters: paramList.add(p)
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result = newProc(procName, paramList, callBody) # build proc
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result.addPragma ident"async" # make proc async
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result[0] = nnkPostFix.newTree(ident"*", newIdentNode($procName)) # export this proc
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# build proc
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result = newProc(procName, paramList, callBody)
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# make proc async
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result.addPragma ident"async"
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# export this proc
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result[0] = nnkPostFix.newTree(ident"*", newIdentNode($procName))
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proc toJsonArray(parameters: NimNode): NimNode =
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# outputs an array of jsonified parameters
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@ -117,7 +130,7 @@ proc createRpcFromSig*(rpcDecl: NimNode): NimNode =
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let iJsonNode = newIdentNode("JsonNode")
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var parameters = rpcDecl.findChild(it.kind == nnkFormalParams).copy
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# ensure we have at least space for a return parameter
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# ensure we have at least space for a return parameter
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if parameters.isNil or parameters.kind == nnkEmpty or parameters.len == 0:
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parameters = nnkFormalParams.newTree(iJsonNode)
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@ -131,13 +144,17 @@ proc createRpcFromSig*(rpcDecl: NimNode): NimNode =
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customReturnType = returnType != iJsonNode
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# insert rpc client as first parameter
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parameters.insert(1, nnkIdentDefs.newTree(ident"client", ident"RpcClient", newEmptyNode()))
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parameters.insert(1, nnkIdentDefs.newTree(ident"client", ident"RpcClient",
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newEmptyNode()))
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let
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jsonParamIdent = genSym(nskVar, "jsonParam") # variable used to send json to the server
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jsonParamArray = parameters.toJsonArray() # json array of marshalled parameters
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# variable used to send json to the server
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jsonParamIdent = genSym(nskVar, "jsonParam")
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# json array of marshalled parameters
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jsonParamArray = parameters.toJsonArray()
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var
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# populate json params - even rpcs with no parameters have an empty json array node sent
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# populate json params - even rpcs with no parameters have an empty json
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# array node sent
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callBody = newStmtList().add(quote do:
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var `jsonParamIdent` = `jsonParamArray`
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)
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@ -148,15 +165,18 @@ proc createRpcFromSig*(rpcDecl: NimNode): NimNode =
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result = createRpcProc(procName, parameters, callBody)
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let
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rpcResult = genSym(nskLet, "res") # temporary variable to hold `Response` from rpc call
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# temporary variable to hold `Response` from rpc call
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rpcResult = genSym(nskLet, "res")
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clientIdent = newIdentNode("client")
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procRes = ident"result" # proc return variable
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jsonRpcResult = # actual return value, `rpcResult`.result
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nnkDotExpr.newTree(rpcResult, newIdentNode("result"))
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# proc return variable
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procRes = ident"result"
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# actual return value, `rpcResult`.result
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jsonRpcResult = nnkDotExpr.newTree(rpcResult, newIdentNode("result"))
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# perform rpc call
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callBody.add(quote do:
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let `rpcResult` = await `clientIdent`.call(`pathStr`, `jsonParamIdent`) # `rpcResult` is of type `Response`
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# `rpcResult` is of type `Response`
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let `rpcResult` = await `clientIdent`.call(`pathStr`, `jsonParamIdent`)
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if `rpcResult`.error: raise newException(ValueError, $`rpcResult`.result)
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)
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@ -1,5 +1,8 @@
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import asyncdispatch, asyncnet, json, tables, strutils, options, jsonmarshal, macros
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export asyncdispatch, asyncnet, json, jsonmarshal
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import json, tables, strutils, options, macros
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import asyncdispatch2
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import jsonmarshal
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export asyncdispatch2, json, jsonmarshal
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type
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RpcJsonError* = enum rjeInvalidJson, rjeVersionError, rjeNoMethod, rjeNoId
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@ -9,10 +12,8 @@ type
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# Procedure signature accepted as an RPC call by server
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RpcProc* = proc (params: JsonNode): Future[JsonNode]
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RpcServer* = ref object
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socket*: AsyncSocket
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port*: Port
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address*: string
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RpcServer* = ref object of RootRef
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servers*: seq[StreamServer]
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procs*: TableRef[string, RpcProc]
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RpcProcError* = ref object of Exception
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@ -35,20 +36,15 @@ const
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(INVALID_REQUEST, "No id specified")
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]
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template ifDebug*(actions: untyped): untyped =
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# TODO: Replace with nim-chronicle
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when not defined(release): actions else: discard
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when not defined(release):
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template ifDebug*(actions: untyped): untyped =
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actions
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else:
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template ifDebug*(actions: untyped): untyped =
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discard
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proc `$`*(port: Port): string = $int(port)
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proc newRpcServer*(address = "localhost", port: Port = Port(8545)): RpcServer =
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result = RpcServer(
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socket: newAsyncSocket(),
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port: port,
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address: address,
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procs: newTable[string, RpcProc]()
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)
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# Json state checking
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template jsonValid*(jsonString: string, node: var JsonNode): (bool, string) =
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@ -61,7 +57,8 @@ template jsonValid*(jsonString: string, node: var JsonNode): (bool, string) =
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msg = getCurrentExceptionMsg()
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(valid, msg)
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proc checkJsonErrors*(line: string, node: var JsonNode): Option[RpcJsonErrorContainer] =
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proc checkJsonErrors*(line: string,
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node: var JsonNode): Option[RpcJsonErrorContainer] =
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## Tries parsing line into node, if successful checks required fields
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## Returns: error state or none
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let res = jsonValid(line, node)
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@ -79,30 +76,32 @@ proc checkJsonErrors*(line: string, node: var JsonNode): Option[RpcJsonErrorCont
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proc wrapReply*(id: JsonNode, value: JsonNode, error: JsonNode): string =
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let node = %{"jsonrpc": %"2.0", "result": value, "error": error, "id": id}
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return $node & "\c\l"
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return $node & "\c\l"
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proc sendError*(client: AsyncSocket, code: int, msg: string, id: JsonNode, data: JsonNode = newJNull()) {.async.} =
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proc sendError*(client: StreamTransport, code: int, msg: string, id: JsonNode,
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data: JsonNode = newJNull()) {.async.} =
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## Send error message to client
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let error = %{"code": %(code), "message": %msg, "data": data}
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ifDebug: echo "Send error json: ", wrapReply(newJNull(), error, id)
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result = client.send(wrapReply(id, newJNull(), error))
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result = client.write(wrapReply(id, newJNull(), error))
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proc sendJsonError*(state: RpcJsonError, client: AsyncSocket, id: JsonNode, data = newJNull()) {.async.} =
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proc sendJsonError*(state: RpcJsonError, client: StreamTransport, id: JsonNode,
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data = newJNull()) {.async.} =
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## Send client response for invalid json state
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let errMsgs = jsonErrorMessages[state]
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await client.sendError(errMsgs[0], errMsgs[1], id, data)
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# Server message processing
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proc processMessage(server: RpcServer, client: AsyncSocket, line: string) {.async.} =
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proc processMessage(server: RpcServer, client: StreamTransport,
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line: string) {.async.} =
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var
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node: JsonNode
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jsonErrorState = checkJsonErrors(line, node) # set up node and/or flag errors
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# set up node and/or flag errors
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jsonErrorState = checkJsonErrors(line, node)
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if jsonErrorState.isSome:
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let errState = jsonErrorState.get
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var id: JsonNode
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if errState.err == rjeInvalidJson: id = newJNull() # id cannot be retrieved
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else: id = node["id"]
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var id = if errState.err == rjeInvalidJson: newJNull() else: node["id"]
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await errState.err.sendJsonError(client, id, %errState.msg)
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else:
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let
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@ -110,23 +109,26 @@ proc processMessage(server: RpcServer, client: AsyncSocket, line: string) {.asyn
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id = node["id"]
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if not server.procs.hasKey(methodName):
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await client.sendError(METHOD_NOT_FOUND, "Method not found", id, %(methodName & " is not a registered method."))
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await client.sendError(METHOD_NOT_FOUND, "Method not found", id,
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%(methodName & " is not a registered method."))
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else:
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let callRes = await server.procs[methodName](node["params"])
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await client.send(wrapReply(id, callRes, newJNull()))
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discard await client.write(wrapReply(id, callRes, newJNull()))
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proc processClient(server: RpcServer, client: AsyncSocket) {.async.} =
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proc processClient(server: StreamServer, client: StreamTransport) {.async.} =
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var rpc = getUserData[RpcServer](server)
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while true:
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let line = await client.recvLine()
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## TODO: We need to put limit here, or server could be easily put out of
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## service without never-ending line (data without CRLF).
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let line = await client.readLine()
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if line == "":
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# Disconnected.
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client.close()
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break
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ifDebug: echo "Process client: ", server.port, ":" & line
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ifDebug: echo "Process client: ", client.remoteAddress()
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let future = processMessage(server, client, line)
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await future
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let future = processMessage(rpc, client, line)
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yield future
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if future.failed:
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if future.readError of RpcProcError:
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let err = future.readError.RpcProcError
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@ -135,16 +137,33 @@ proc processClient(server: RpcServer, client: AsyncSocket) {.async.} =
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let err = future.readError[].ValueError
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await client.sendError(INVALID_PARAMS, err.msg, %"")
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else:
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await client.sendError(SERVER_ERROR, "Error: Unknown error occurred", %"")
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await client.sendError(SERVER_ERROR,
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"Error: Unknown error occurred", %"")
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proc serve*(server: RpcServer) {.async.} =
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proc newRpcServer*(address = "localhost", port: Port = Port(8545)): RpcServer =
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let tas4 = resolveTAddress(address, port, IpAddressFamily.IPv4)
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let tas6 = resolveTAddress(address, port, IpAddressFamily.IPv4)
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result = RpcServer()
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result.procs = newTable[string, RpcProc]()
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result.servers = newSeq[StreamServer]()
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for item in tas4:
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var server = createStreamServer(item, processClient, {ReuseAddr},
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udata = result)
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result.servers.add(server)
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for item in tas6:
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var server = createStreamServer(item, processClient, {ReuseAddr},
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udata = result)
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result.servers.add(server)
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proc start*(server: RpcServer) =
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## Start the RPC server.
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server.socket.bindAddr(server.port, server.address)
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server.socket.listen()
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for item in server.servers:
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item.start()
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while true:
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let client = await server.socket.accept()
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asyncCheck server.processClient(client)
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proc stop*(server: RpcServer) =
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## Stop the RPC server.
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for item in server.servers:
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item.stop()
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# Server registration and RPC generation
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@ -162,7 +181,8 @@ proc makeProcName(s: string): string =
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if c.isAlphaNumeric: result.add c
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proc hasReturnType(params: NimNode): bool =
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if params != nil and params.len > 0 and params[0] != nil and params[0].kind != nnkEmpty:
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if params != nil and params.len > 0 and params[0] != nil and
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params[0].kind != nnkEmpty:
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result = true
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macro rpc*(server: RpcServer, path: string, body: untyped): untyped =
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@ -178,12 +198,18 @@ macro rpc*(server: RpcServer, path: string, body: untyped): untyped =
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result = newStmtList()
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let
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parameters = body.findChild(it.kind == nnkFormalParams)
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paramsIdent = newIdentNode"params" # all remote calls have a single parameter: `params: JsonNode`
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pathStr = $path # procs are generated from the stripped path
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procNameStr = pathStr.makeProcName # strip non alphanumeric
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procName = newIdentNode(procNameStr) # public rpc proc
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doMain = newIdentNode(procNameStr & "DoMain") # when parameters present: proc that contains our rpc body
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res = newIdentNode("result") # async result
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# all remote calls have a single parameter: `params: JsonNode`
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paramsIdent = newIdentNode"params"
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# procs are generated from the stripped path
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pathStr = $path
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# strip non alphanumeric
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procNameStr = pathStr.makeProcName
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# public rpc proc
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procName = newIdentNode(procNameStr)
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# when parameters present: proc that contains our rpc body
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doMain = newIdentNode(procNameStr & "DoMain")
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# async result
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res = newIdentNode("result")
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var
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setup = jsonToNim(parameters, paramsIdent)
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||||
procBody = if body.kind == nnkStmtList: body else: body.body
|
||||
|
|
|
|||
|
|
@ -8,7 +8,8 @@ skipDirs = @["tests"]
|
|||
### Dependencies
|
||||
requires "nim >= 0.17.3",
|
||||
"nimcrypto",
|
||||
"stint"
|
||||
"stint",
|
||||
"https://github.com/status-im/nim-asyncdispatch2"
|
||||
|
||||
proc configForTests() =
|
||||
--hints: off
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
import ../ rpcclient, ../ rpcserver
|
||||
import unittest, asyncdispatch, json, tables
|
||||
import unittest, json, tables
|
||||
import ../rpcclient, ../rpcserver
|
||||
import stint, ethtypes, ethprocs, stintjson
|
||||
|
||||
from os import getCurrentDir, DirSep
|
||||
|
|
@ -7,7 +7,7 @@ from strutils import rsplit
|
|||
template sourceDir: string = currentSourcePath.rsplit(DirSep, 1)[0]
|
||||
|
||||
var
|
||||
server = newRpcServer()
|
||||
server = newRpcServer("localhost", Port(8546))
|
||||
client = newRpcClient()
|
||||
|
||||
## Generate Ethereum server RPCs
|
||||
|
|
@ -48,9 +48,7 @@ proc testSigCalls: Future[seq[string]] =
|
|||
sha3 = client.web3_sha3("0x68656c6c6f20776f726c64")
|
||||
result = all(version, sha3)
|
||||
|
||||
server.address = "localhost"
|
||||
server.port = Port(8546)
|
||||
asyncCheck server.serve
|
||||
server.start()
|
||||
waitFor client.connect("localhost", Port(8546))
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -1,4 +1,5 @@
|
|||
import unittest, ../ rpcserver, asyncdispatch, json, tables
|
||||
import unittest, json, tables
|
||||
import ../rpcserver
|
||||
|
||||
type
|
||||
# some nested types to check object parsing
|
||||
|
|
@ -30,10 +31,10 @@ var s = newRpcServer("localhost")
|
|||
|
||||
# RPC definitions
|
||||
|
||||
s.rpc("rpc.simplepath"):
|
||||
s.rpc("rpc.simplepath"):
|
||||
result = %1
|
||||
|
||||
s.rpc("rpc.differentparams") do(a: int, b: string):
|
||||
s.rpc("rpc.differentparams") do(a: int, b: string):
|
||||
result = %[%a, %b]
|
||||
|
||||
s.rpc("rpc.arrayparam") do(arr: array[0..5, byte], b: string):
|
||||
|
|
|
|||
|
|
@ -1,16 +1,14 @@
|
|||
import ../ rpcclient, ../ rpcserver
|
||||
import unittest, json
|
||||
import ../rpcclient, ../rpcserver
|
||||
|
||||
var srv = newRpcServer()
|
||||
srv.address = "localhost"
|
||||
srv.port = Port(8545)
|
||||
var client = newRpcClient()
|
||||
|
||||
# Create RPC on server
|
||||
srv.rpc("myProc") do(input: string, data: array[0..3, int]):
|
||||
result = %("Hello " & input & " data: " & $data)
|
||||
|
||||
asyncCheck srv.serve
|
||||
srv.start()
|
||||
waitFor client.connect("localhost", Port(8545))
|
||||
|
||||
# TODO: When an error occurs during a test, stop the server
|
||||
|
|
|
|||
Loading…
Reference in New Issue