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cmd, node, rpc: readd inproc RPC client, expose via node
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| // Copyright 2016 The go-ethereum Authors | ||
| // This file is part of the go-ethereum library. | ||
| // | ||
| // The go-ethereum library is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // The go-ethereum library is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
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| package rpc | ||
|
|
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| import "encoding/json" | ||
|
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| // NewInProcRPCClient creates an in-process buffer stream attachment to a given | ||
| // RPC server. | ||
| func NewInProcRPCClient(handler *Server) Client { | ||
| buffer := &inprocBuffer{ | ||
| requests: make(chan []byte, 16), | ||
| responses: make(chan []byte, 16), | ||
| } | ||
| client := &inProcClient{ | ||
| server: handler, | ||
| buffer: buffer, | ||
| } | ||
| go handler.ServeCodec(NewJSONCodec(client.buffer)) | ||
| return client | ||
| } | ||
|
|
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| // inProcClient is an in-process buffer stream attached to an RPC server. | ||
| type inProcClient struct { | ||
| server *Server | ||
| buffer *inprocBuffer | ||
| } | ||
|
|
||
| // Close tears down the request channel of the in-proc client. | ||
| func (c *inProcClient) Close() { | ||
| c.buffer.Close() | ||
| } | ||
|
|
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| // Send marshals a message into a json format and injects in into the client | ||
| // request channel. | ||
| func (c *inProcClient) Send(msg interface{}) error { | ||
| d, err := json.Marshal(msg) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| c.buffer.requests <- d | ||
| return nil | ||
| } | ||
|
|
||
| // Recv reads a message from the response channel and tries to parse it into the | ||
| // given msg interface. | ||
| func (c *inProcClient) Recv(msg interface{}) error { | ||
| data := <-c.buffer.responses | ||
| return json.Unmarshal(data, &msg) | ||
| } | ||
|
|
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| // Returns the collection of modules the RPC server offers. | ||
| func (c *inProcClient) SupportedModules() (map[string]string, error) { | ||
| return SupportedModules(c) | ||
| } | ||
|
|
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| // inprocBuffer represents the connection between the RPC server and console | ||
| type inprocBuffer struct { | ||
| readBuf []byte // store remaining request bytes after a partial read | ||
| requests chan []byte // list with raw serialized requests | ||
| responses chan []byte // list with raw serialized responses | ||
| } | ||
|
|
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| // Read will read the next request in json format. | ||
| func (b *inprocBuffer) Read(p []byte) (int, error) { | ||
| // last read didn't read entire request, return remaining bytes | ||
| if len(b.readBuf) > 0 { | ||
| n := copy(p, b.readBuf) | ||
| if n < len(b.readBuf) { | ||
| b.readBuf = b.readBuf[:n] | ||
| } else { | ||
| b.readBuf = b.readBuf[:0] | ||
| } | ||
| return n, nil | ||
| } | ||
| // read next request | ||
| req := <-b.requests | ||
| n := copy(p, req) | ||
| if n < len(req) { | ||
| // inprocBuffer too small, store remaining chunk for next read | ||
| b.readBuf = req[n:] | ||
| } | ||
| return n, nil | ||
| } | ||
|
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| // Write sends the given buffer to the backend. | ||
| func (b *inprocBuffer) Write(p []byte) (n int, err error) { | ||
| b.responses <- p | ||
| return len(p), nil | ||
| } | ||
|
|
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| // Close cleans up obtained resources. | ||
| func (b *inprocBuffer) Close() error { | ||
| close(b.requests) | ||
| close(b.responses) | ||
|
|
||
| return nil | ||
| } |
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