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identity.go (1887B)

      1 // Copyright 2011 Google Inc. All rights reserved.
      2 // Use of this source code is governed by the Apache 2.0
      3 // license that can be found in the LICENSE file.
      4 
      5 package internal
      6 
      7 import (
      8 	"os"
      9 
     10 	netcontext "golang.org/x/net/context"
     11 )
     12 
     13 var (
     14 	// This is set to true in identity_classic.go, which is behind the appengine build tag.
     15 	// The appengine build tag is set for the first generation runtimes (<= Go 1.9) but not
     16 	// the second generation runtimes (>= Go 1.11), so this indicates whether we're on a
     17 	// first-gen runtime. See IsStandard below for the second-gen check.
     18 	appengineStandard bool
     19 
     20 	// This is set to true in identity_flex.go, which is behind the appenginevm build tag.
     21 	appengineFlex bool
     22 )
     23 
     24 // AppID is the implementation of the wrapper function of the same name in
     25 // ../identity.go. See that file for commentary.
     26 func AppID(c netcontext.Context) string {
     27 	return appID(FullyQualifiedAppID(c))
     28 }
     29 
     30 // IsStandard is the implementation of the wrapper function of the same name in
     31 // ../appengine.go. See that file for commentary.
     32 func IsStandard() bool {
     33 	// appengineStandard will be true for first-gen runtimes (<= Go 1.9) but not
     34 	// second-gen (>= Go 1.11).
     35 	return appengineStandard || IsSecondGen()
     36 }
     37 
     38 // IsStandard is the implementation of the wrapper function of the same name in
     39 // ../appengine.go. See that file for commentary.
     40 func IsSecondGen() bool {
     41 	// Second-gen runtimes set $GAE_ENV so we use that to check if we're on a second-gen runtime.
     42 	return os.Getenv("GAE_ENV") == "standard"
     43 }
     44 
     45 // IsFlex is the implementation of the wrapper function of the same name in
     46 // ../appengine.go. See that file for commentary.
     47 func IsFlex() bool {
     48 	return appengineFlex
     49 }
     50 
     51 // IsAppEngine is the implementation of the wrapper function of the same name in
     52 // ../appengine.go. See that file for commentary.
     53 func IsAppEngine() bool {
     54 	return IsStandard() || IsFlex()
     55 }