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authorFelix Lange <fjl@twurst.com>2016-07-12 23:47:15 +0800
committerFelix Lange <fjl@twurst.com>2016-07-23 05:21:27 +0800
commit91b769042857f542b2792b23ec407e1c9bd4fe8d (patch)
treef6730b3e85a7ac5ca98f9a716505349958fcacd3 /rpc/client_context_go1.4.go
parentbb01bea4e276dad359815c682a2dee730737f4dc (diff)
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rpc: add new client, use it everywhere
The new client implementation supports concurrent requests, subscriptions and replaces the various ad hoc RPC clients throughout go-ethereum.
Diffstat (limited to 'rpc/client_context_go1.4.go')
-rw-r--r--rpc/client_context_go1.4.go60
1 files changed, 60 insertions, 0 deletions
diff --git a/rpc/client_context_go1.4.go b/rpc/client_context_go1.4.go
new file mode 100644
index 000000000..ac956a17d
--- /dev/null
+++ b/rpc/client_context_go1.4.go
@@ -0,0 +1,60 @@
+// 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/>.
+
+// +build !go1.5
+
+package rpc
+
+import (
+ "net"
+ "net/http"
+ "time"
+
+ "golang.org/x/net/context"
+)
+
+// In older versions of Go (below 1.5), dials cannot be canceled
+// via a channel or context. The context deadline can still applied.
+
+// contextDialer returns a dialer that applies the deadline value from the given context.
+func contextDialer(ctx context.Context) *net.Dialer {
+ dialer := &net.Dialer{KeepAlive: tcpKeepAliveInterval}
+ if deadline, ok := ctx.Deadline(); ok {
+ dialer.Deadline = deadline
+ } else {
+ dialer.Deadline = time.Now().Add(defaultDialTimeout)
+ }
+ return dialer
+}
+
+// dialContext connects to the given address, aborting the dial if ctx is canceled.
+func dialContext(ctx context.Context, network, addr string) (net.Conn, error) {
+ return contextDialer(ctx).Dial(network, addr)
+}
+
+// requestWithContext copies req, adding the cancelation channel and deadline from ctx.
+func requestWithContext(c *http.Client, req *http.Request, ctx context.Context) (*http.Client, *http.Request) {
+ // Set Timeout on the client if the context has a deadline.
+ // Note that there is no default timeout (unlike in contextDialer) because
+ // the timeout applies to the entire request, including reads from body.
+ if deadline, ok := ctx.Deadline(); ok {
+ c2 := *c
+ c2.Timeout = deadline.Sub(time.Now())
+ c = &c2
+ }
+ req2 := *req
+ return c, &req2
+}