56 lines
1.9 KiB
Go
56 lines
1.9 KiB
Go
|
// 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 go1.6,!go1.7
|
||
|
|
|
||
|
|
package rpc
|
||
|
|
|
||
|
|
import (
|
||
|
|
"net"
|
||
|
|
"net/http"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"golang.org/x/net/context"
|
||
|
|
)
|
||
|
|
|
||
|
|
// In Go 1.6, net.Dialer gained the ability to cancel via a channel.
|
||
|
|
|
||
|
|
// contextDialer returns a dialer that applies the deadline value from the given context.
|
||
|
|
func contextDialer(ctx context.Context) *net.Dialer {
|
||
|
|
dialer := &net.Dialer{Cancel: ctx.Done(), 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) {
|
||
|
|
// We set Timeout on the client for Go <= 1.5. There
|
||
|
|
// is no need to do that here because the dial will be canceled
|
||
|
|
// by package http.
|
||
|
|
req2 := *req
|
||
|
|
req2.Cancel = ctx.Done()
|
||
|
|
return c, &req2
|
||
|
|
}
|