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// Copyright 2011 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
// +build !appengine
package internal
import (
"log"
"net/http"
"os"
"strings"
netcontext "golang.org/x/net/context"
)
// These functions are implementations of the wrapper functions
// in ../appengine/identity.go. See that file for commentary.
const (
hDefaultVersionHostname = "X-AppEngine-Default-Version-Hostname"
hRequestLogId = "X-AppEngine-Request-Log-Id"
hDatacenter = "X-AppEngine-Datacenter"
)
func ctxHeaders(ctx netcontext.Context) http.Header {
c := fromContext(ctx)
if c == nil {
return nil
}
return c.Request().Header
}
func DefaultVersionHostname(ctx netcontext.Context) string {
return ctxHeaders(ctx).Get(hDefaultVersionHostname)
}
func RequestID(ctx netcontext.Context) string {
return ctxHeaders(ctx).Get(hRequestLogId)
}
func Datacenter(ctx netcontext.Context) string {
if dc := ctxHeaders(ctx).Get(hDatacenter); dc != "" {
return dc
}
// If the header isn't set, read zone from the metadata service.
// It has the format projects/[NUMERIC_PROJECT_ID]/zones/[ZONE]
zone, err := getMetadata("instance/zone")
if err != nil {
log.Printf("Datacenter: %v", err)
return ""
}
parts := strings.Split(string(zone), "/")
if len(parts) == 0 {
return ""
}
return parts[len(parts)-1]
}
func ServerSoftware() string {
// TODO(dsymonds): Remove fallback when we've verified this.
if s := os.Getenv("SERVER_SOFTWARE"); s != "" {
return s
}
if s := os.Getenv("GAE_ENV"); s != "" {
return s
}
return "Google App Engine/1.x.x"
}
// TODO(dsymonds): Remove the metadata fetches.
func ModuleName(_ netcontext.Context) string {
if s := os.Getenv("GAE_MODULE_NAME"); s != "" {
return s
}
if s := os.Getenv("GAE_SERVICE"); s != "" {
return s
}
return string(mustGetMetadata("instance/attributes/gae_backend_name"))
}
func VersionID(_ netcontext.Context) string {
if s1, s2 := os.Getenv("GAE_MODULE_VERSION"), os.Getenv("GAE_MINOR_VERSION"); s1 != "" && s2 != "" {
return s1 + "." + s2
}
if s1, s2 := os.Getenv("GAE_VERSION"), os.Getenv("GAE_DEPLOYMENT_ID"); s1 != "" && s2 != "" {
return s1 + "." + s2
}
return string(mustGetMetadata("instance/attributes/gae_backend_version")) + "." + string(mustGetMetadata("instance/attributes/gae_backend_minor_version"))
}
func InstanceID() string {
if s := os.Getenv("GAE_MODULE_INSTANCE"); s != "" {
return s
}
if s := os.Getenv("GAE_INSTANCE"); s != "" {
return s
}
return string(mustGetMetadata("instance/attributes/gae_backend_instance"))
}
func partitionlessAppID() string {
// gae_project has everything except the partition prefix.
if appID := os.Getenv("GAE_LONG_APP_ID"); appID != "" {
return appID
}
if project := os.Getenv("GOOGLE_CLOUD_PROJECT"); project != "" {
return project
}
return string(mustGetMetadata("instance/attributes/gae_project"))
}
func fullyQualifiedAppID(_ netcontext.Context) string {
if s := os.Getenv("GAE_APPLICATION"); s != "" {
return s
}
appID := partitionlessAppID()
part := os.Getenv("GAE_PARTITION")
if part == "" {
part = string(mustGetMetadata("instance/attributes/gae_partition"))
}
if part != "" {
appID = part + "~" + appID
}
return appID
}
func IsDevAppServer() bool {
return os.Getenv("RUN_WITH_DEVAPPSERVER") != ""
}
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