26a09c434d
* app.yaml: update to go112 Make the required changes to use go112 due to the deprecation of Go 1.9. Migration doc: - https://cloud.google.com/appengine/docs/standard/go111/go-differences References: - https://github.com/GoogleCloudPlatform/govanityurls/issues/29#issuecomment-506538041 - https://github.com/etcd-io/maintainers/issues/17 * go.mod: initial commit Migrate this project to use go.mod and update the README. This is part of the recommended steps to runtime: go111 and beyond. https://cloud.google.com/appengine/docs/standard/go111/go-differences * vendor: add dependent packages Add all dependencies for the project via vendoring for offline builds. * travis.yml: drop go 1.6 for 1.12 Go 1.6 is too old to have a number of builtin packages for the latest appengine package. Remove and update to match app engine version: 1.12. * appengine.go: remove unused file From the go111 migration doc: "The appengine build tag is deprecated and will not be used when building your app for deployment. Ensure your code still functions correctly without it being set." https://cloud.google.com/appengine/docs/standard/go111/go-differences * main: respect PORT environment variable The go111 runtime should use the PORT variable to decide the listening http port. "PORT The port that receives HTTP requests." https://cloud.google.com/appengine/docs/standard/go111/runtime
57 lines
1.2 KiB
Go
57 lines
1.2 KiB
Go
// Copyright 2014 Google Inc. All rights reserved.
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// Use of this source code is governed by the Apache 2.0
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// license that can be found in the LICENSE file.
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package internal
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// This file implements a network dialer that limits the number of concurrent connections.
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// It is only used for API calls.
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import (
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"log"
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"net"
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"runtime"
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"sync"
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"time"
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)
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var limitSem = make(chan int, 100) // TODO(dsymonds): Use environment variable.
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func limitRelease() {
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// non-blocking
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select {
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case <-limitSem:
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default:
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// This should not normally happen.
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log.Print("appengine: unbalanced limitSem release!")
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}
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}
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func limitDial(network, addr string) (net.Conn, error) {
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limitSem <- 1
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// Dial with a timeout in case the API host is MIA.
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// The connection should normally be very fast.
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conn, err := net.DialTimeout(network, addr, 10*time.Second)
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if err != nil {
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limitRelease()
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return nil, err
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}
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lc := &limitConn{Conn: conn}
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runtime.SetFinalizer(lc, (*limitConn).Close) // shouldn't usually be required
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return lc, nil
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}
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type limitConn struct {
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close sync.Once
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net.Conn
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}
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func (lc *limitConn) Close() error {
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defer lc.close.Do(func() {
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limitRelease()
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runtime.SetFinalizer(lc, nil)
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})
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return lc.Conn.Close()
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}
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