62 lines
2.2 KiB
Go
62 lines
2.2 KiB
Go
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// +build go1.5,!go1.6
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package rpc
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import (
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"net"
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"net/http"
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"time"
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"golang.org/x/net/context"
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)
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// In Go 1.5, dials cannot be canceled via a channel or context. The context deadline can
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// still be applied. Go 1.5 adds the ability to cancel HTTP requests via a channel.
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// contextDialer returns a dialer that applies the deadline value from the given context.
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func contextDialer(ctx context.Context) *net.Dialer {
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dialer := &net.Dialer{KeepAlive: tcpKeepAliveInterval}
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if deadline, ok := ctx.Deadline(); ok {
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dialer.Deadline = deadline
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} else {
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dialer.Deadline = time.Now().Add(defaultDialTimeout)
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}
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return dialer
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}
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// dialContext connects to the given address, aborting the dial if ctx is canceled.
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func dialContext(ctx context.Context, network, addr string) (net.Conn, error) {
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return contextDialer(ctx).Dial(network, addr)
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}
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// requestWithContext copies req, adding the cancelation channel and deadline from ctx.
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func requestWithContext(c *http.Client, req *http.Request, ctx context.Context) (*http.Client, *http.Request) {
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// Set Timeout on the client if the context has a deadline.
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// Note that there is no default timeout (unlike in contextDialer) because
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// the timeout applies to the entire request, including reads from body.
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if deadline, ok := ctx.Deadline(); ok {
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c2 := *c
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c2.Timeout = deadline.Sub(time.Now())
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c = &c2
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}
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req2 := *req
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req2.Cancel = ctx.Done()
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return c, &req2
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}
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