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138 lines
4.3 KiB
Go
138 lines
4.3 KiB
Go
// Copyright 2011 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 appengine provides basic functionality for Google App Engine.
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//
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// For more information on how to write Go apps for Google App Engine, see:
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// https://cloud.google.com/appengine/docs/go/
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package appengine // import "google.golang.org/appengine"
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import (
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"net/http"
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"github.com/golang/protobuf/proto"
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"golang.org/x/net/context"
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"google.golang.org/appengine/internal"
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)
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// The gophers party all night; the rabbits provide the beats.
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// Main is the principal entry point for an app running in App Engine.
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//
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// On App Engine Flexible it installs a trivial health checker if one isn't
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// already registered, and starts listening on port 8080 (overridden by the
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// $PORT environment variable).
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//
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// See https://cloud.google.com/appengine/docs/flexible/custom-runtimes#health_check_requests
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// for details on how to do your own health checking.
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//
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// On App Engine Standard it ensures the server has started and is prepared to
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// receive requests.
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//
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// Main never returns.
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//
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// Main is designed so that the app's main package looks like this:
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//
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// package main
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//
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// import (
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// "google.golang.org/appengine"
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//
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// _ "myapp/package0"
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// _ "myapp/package1"
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// )
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//
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// func main() {
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// appengine.Main()
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// }
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//
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// The "myapp/packageX" packages are expected to register HTTP handlers
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// in their init functions.
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func Main() {
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internal.Main()
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}
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// IsDevAppServer reports whether the App Engine app is running in the
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// development App Server.
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func IsDevAppServer() bool {
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return internal.IsDevAppServer()
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}
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// IsStandard reports whether the App Engine app is running in the standard
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// environment. This includes both the first generation runtimes (<= Go 1.9)
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// and the second generation runtimes (>= Go 1.11).
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func IsStandard() bool {
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return internal.IsStandard()
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}
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// IsFlex reports whether the App Engine app is running in the flexible environment.
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func IsFlex() bool {
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return internal.IsFlex()
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}
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// IsAppEngine reports whether the App Engine app is running on App Engine, in either
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// the standard or flexible environment.
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func IsAppEngine() bool {
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return internal.IsAppEngine()
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}
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// IsSecondGen reports whether the App Engine app is running on the second generation
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// runtimes (>= Go 1.11).
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func IsSecondGen() bool {
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return internal.IsSecondGen()
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}
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// NewContext returns a context for an in-flight HTTP request.
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// This function is cheap.
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func NewContext(req *http.Request) context.Context {
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return internal.ReqContext(req)
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}
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// WithContext returns a copy of the parent context
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// and associates it with an in-flight HTTP request.
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// This function is cheap.
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func WithContext(parent context.Context, req *http.Request) context.Context {
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return internal.WithContext(parent, req)
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}
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// TODO(dsymonds): Add a Call function here? Otherwise other packages can't access internal.Call.
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// BlobKey is a key for a blobstore blob.
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//
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// Conceptually, this type belongs in the blobstore package, but it lives in
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// the appengine package to avoid a circular dependency: blobstore depends on
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// datastore, and datastore needs to refer to the BlobKey type.
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type BlobKey string
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// GeoPoint represents a location as latitude/longitude in degrees.
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type GeoPoint struct {
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Lat, Lng float64
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}
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// Valid returns whether a GeoPoint is within [-90, 90] latitude and [-180, 180] longitude.
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func (g GeoPoint) Valid() bool {
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return -90 <= g.Lat && g.Lat <= 90 && -180 <= g.Lng && g.Lng <= 180
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}
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// APICallFunc defines a function type for handling an API call.
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// See WithCallOverride.
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type APICallFunc func(ctx context.Context, service, method string, in, out proto.Message) error
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// WithAPICallFunc returns a copy of the parent context
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// that will cause API calls to invoke f instead of their normal operation.
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//
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// This is intended for advanced users only.
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func WithAPICallFunc(ctx context.Context, f APICallFunc) context.Context {
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return internal.WithCallOverride(ctx, internal.CallOverrideFunc(f))
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}
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// APICall performs an API call.
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//
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// This is not intended for general use; it is exported for use in conjunction
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// with WithAPICallFunc.
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func APICall(ctx context.Context, service, method string, in, out proto.Message) error {
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return internal.Call(ctx, service, method, in, out)
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}
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