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https://github.com/logos-storage/nim-json-rpc.git
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91 lines
2.6 KiB
Nim
91 lines
2.6 KiB
Nim
# json-rpc
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# Copyright (c) 2019-2023 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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# * MIT license ([LICENSE-MIT](LICENSE-MIT))
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# at your option.
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# This file may not be copied, modified, or distributed except according to
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# those terms.
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import
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std/tables,
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chronicles,
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results,
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chronos,
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../client,
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../private/errors,
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../private/jrpc_sys
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export client
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type
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RpcSocketClient* = ref object of RpcClient
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transport*: StreamTransport
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address*: TransportAddress
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loop*: Future[void]
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const defaultMaxRequestLength* = 1024 * 128
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{.push gcsafe, raises: [].}
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proc new*(T: type RpcSocketClient): T =
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T()
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proc newRpcSocketClient*: RpcSocketClient =
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## Creates a new client instance.
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RpcSocketClient.new()
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method call*(self: RpcSocketClient, name: string,
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params: RequestParamsTx): Future[JsonString] {.async, gcsafe.} =
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## Remotely calls the specified RPC method.
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let id = self.getNextId()
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var value = requestTxEncode(name, params, id) & "\r\n"
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if self.transport.isNil:
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raise newException(JsonRpcError,
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"Transport is not initialised (missing a call to connect?)")
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# completed by processMessage.
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var newFut = newFuture[JsonString]()
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# add to awaiting responses
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self.awaiting[id] = newFut
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let res = await self.transport.write(value)
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# TODO: Add actions when not full packet was send, e.g. disconnect peer.
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doAssert(res == len(value))
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return await newFut
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proc processData(client: RpcSocketClient) {.async.} =
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while true:
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while true:
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var value = await client.transport.readLine(defaultMaxRequestLength)
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if value == "":
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# transmission ends
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await client.transport.closeWait()
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break
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let res = client.processMessage(value)
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if res.isErr:
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error "error when processing message", msg=res.error
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raise newException(JsonRpcError, res.error)
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# async loop reconnection and waiting
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client.transport = await connect(client.address)
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proc connect*(client: RpcSocketClient, address: string, port: Port) {.async.} =
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let addresses = resolveTAddress(address, port)
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client.transport = await connect(addresses[0])
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client.address = addresses[0]
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client.loop = processData(client)
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proc connect*(client: RpcSocketClient, address: TransportAddress) {.async.} =
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client.transport = await connect(address)
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client.address = address
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client.loop = processData(client)
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method close*(client: RpcSocketClient) {.async.} =
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await client.loop.cancelAndWait()
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if not client.transport.isNil:
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client.transport.close()
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client.transport = nil
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