forked from jshiffer/matterbridge
135 lines
3.3 KiB
Go
135 lines
3.3 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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// +build !appengine
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package internal
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import (
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"log"
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"net/http"
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"os"
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"strings"
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netcontext "golang.org/x/net/context"
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)
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// These functions are implementations of the wrapper functions
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// in ../appengine/identity.go. See that file for commentary.
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const (
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hDefaultVersionHostname = "X-AppEngine-Default-Version-Hostname"
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hRequestLogId = "X-AppEngine-Request-Log-Id"
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hDatacenter = "X-AppEngine-Datacenter"
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)
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func ctxHeaders(ctx netcontext.Context) http.Header {
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c := fromContext(ctx)
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if c == nil {
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return nil
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}
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return c.Request().Header
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}
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func DefaultVersionHostname(ctx netcontext.Context) string {
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return ctxHeaders(ctx).Get(hDefaultVersionHostname)
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}
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func RequestID(ctx netcontext.Context) string {
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return ctxHeaders(ctx).Get(hRequestLogId)
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}
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func Datacenter(ctx netcontext.Context) string {
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if dc := ctxHeaders(ctx).Get(hDatacenter); dc != "" {
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return dc
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}
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// If the header isn't set, read zone from the metadata service.
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// It has the format projects/[NUMERIC_PROJECT_ID]/zones/[ZONE]
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zone, err := getMetadata("instance/zone")
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if err != nil {
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log.Printf("Datacenter: %v", err)
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return ""
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}
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parts := strings.Split(string(zone), "/")
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if len(parts) == 0 {
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return ""
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}
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return parts[len(parts)-1]
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}
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func ServerSoftware() string {
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// TODO(dsymonds): Remove fallback when we've verified this.
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if s := os.Getenv("SERVER_SOFTWARE"); s != "" {
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return s
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}
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if s := os.Getenv("GAE_ENV"); s != "" {
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return s
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}
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return "Google App Engine/1.x.x"
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}
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// TODO(dsymonds): Remove the metadata fetches.
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func ModuleName(_ netcontext.Context) string {
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if s := os.Getenv("GAE_MODULE_NAME"); s != "" {
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return s
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}
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if s := os.Getenv("GAE_SERVICE"); s != "" {
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return s
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}
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return string(mustGetMetadata("instance/attributes/gae_backend_name"))
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}
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func VersionID(_ netcontext.Context) string {
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if s1, s2 := os.Getenv("GAE_MODULE_VERSION"), os.Getenv("GAE_MINOR_VERSION"); s1 != "" && s2 != "" {
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return s1 + "." + s2
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}
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if s1, s2 := os.Getenv("GAE_VERSION"), os.Getenv("GAE_DEPLOYMENT_ID"); s1 != "" && s2 != "" {
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return s1 + "." + s2
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}
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return string(mustGetMetadata("instance/attributes/gae_backend_version")) + "." + string(mustGetMetadata("instance/attributes/gae_backend_minor_version"))
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}
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func InstanceID() string {
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if s := os.Getenv("GAE_MODULE_INSTANCE"); s != "" {
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return s
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}
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if s := os.Getenv("GAE_INSTANCE"); s != "" {
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return s
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}
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return string(mustGetMetadata("instance/attributes/gae_backend_instance"))
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}
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func partitionlessAppID() string {
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// gae_project has everything except the partition prefix.
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if appID := os.Getenv("GAE_LONG_APP_ID"); appID != "" {
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return appID
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}
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if project := os.Getenv("GOOGLE_CLOUD_PROJECT"); project != "" {
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return project
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}
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return string(mustGetMetadata("instance/attributes/gae_project"))
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}
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func fullyQualifiedAppID(_ netcontext.Context) string {
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if s := os.Getenv("GAE_APPLICATION"); s != "" {
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return s
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}
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appID := partitionlessAppID()
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part := os.Getenv("GAE_PARTITION")
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if part == "" {
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part = string(mustGetMetadata("instance/attributes/gae_partition"))
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}
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if part != "" {
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appID = part + "~" + appID
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}
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return appID
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}
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func IsDevAppServer() bool {
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return os.Getenv("RUN_WITH_DEVAPPSERVER") != ""
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}
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