From f3aac71fad041dedd239f0a86f7c7c43614cbf4f Mon Sep 17 00:00:00 2001
From: zsfelfoldi <zsfelfoldi@gmail.com>
Date: Wed, 9 Dec 2015 18:28:07 +0100
Subject: rpc/v2: optionally passing context argument to rpc v2 api methods

---
 rpc/v2/server.go | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

(limited to 'rpc/v2/server.go')

diff --git a/rpc/v2/server.go b/rpc/v2/server.go
index ff6b69015..4c04f04d2 100644
--- a/rpc/v2/server.go
+++ b/rpc/v2/server.go
@@ -25,6 +25,7 @@ import (
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
+	"golang.org/x/net/context"
 )
 
 // NewServer will create a new server instance with no registered handlers.
@@ -120,6 +121,9 @@ func (s *Server) ServeCodec(codec ServerCodec) {
 		codec.Close()
 	}()
 
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
 	for {
 		reqs, batch, err := s.readRequest(codec)
 		if err != nil {
@@ -129,9 +133,9 @@ func (s *Server) ServeCodec(codec ServerCodec) {
 		}
 
 		if batch {
-			go s.execBatch(codec, reqs)
+			go s.execBatch(ctx, codec, reqs)
 		} else {
-			go s.exec(codec, reqs[0])
+			go s.exec(ctx, codec, reqs[0])
 		}
 	}
 }
@@ -220,7 +224,7 @@ func (s *Server) unsubscribe(subid string) bool {
 }
 
 // handle executes a request and returns the response from the callback.
-func (s *Server) handle(codec ServerCodec, req *serverRequest) interface{} {
+func (s *Server) handle(ctx context.Context, codec ServerCodec, req *serverRequest) interface{} {
 	if req.err != nil {
 		return codec.CreateErrorResponse(&req.id, req.err)
 	}
@@ -255,6 +259,9 @@ func (s *Server) handle(codec ServerCodec, req *serverRequest) interface{} {
 	}
 
 	arguments := []reflect.Value{req.callb.rcvr}
+	if req.callb.hasCtx {
+		arguments = append(arguments, reflect.ValueOf(ctx))
+	}
 	if len(req.args) > 0 {
 		arguments = append(arguments, req.args...)
 	}
@@ -277,12 +284,12 @@ func (s *Server) handle(codec ServerCodec, req *serverRequest) interface{} {
 }
 
 // exec executes the given request and writes the result back using the codec.
-func (s *Server) exec(codec ServerCodec, req *serverRequest) {
+func (s *Server) exec(ctx context.Context, codec ServerCodec, req *serverRequest) {
 	var response interface{}
 	if req.err != nil {
 		response = codec.CreateErrorResponse(&req.id, req.err)
 	} else {
-		response = s.handle(codec, req)
+		response = s.handle(ctx, codec, req)
 	}
 
 	if err := codec.Write(response); err != nil {
@@ -293,13 +300,13 @@ func (s *Server) exec(codec ServerCodec, req *serverRequest) {
 
 // execBatch executes the given requests and writes the result back using the codec. It will only write the response
 // back when the last request is processed.
-func (s *Server) execBatch(codec ServerCodec, requests []*serverRequest) {
+func (s *Server) execBatch(ctx context.Context, codec ServerCodec, requests []*serverRequest) {
 	responses := make([]interface{}, len(requests))
 	for i, req := range requests {
 		if req.err != nil {
 			responses[i] = codec.CreateErrorResponse(&req.id, req.err)
 		} else {
-			responses[i] = s.handle(codec, req)
+			responses[i] = s.handle(ctx, codec, req)
 		}
 	}
 
-- 
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