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Timo Reimann 2017-02-07 22:33:23 +01:00
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Copyright 2014 Google Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package cloud contains Google Cloud Platform APIs related types
// and common functions.
package cloud // import "google.golang.org/cloud"
import (
"net/http"
"golang.org/x/net/context"
"google.golang.org/cloud/internal"
)
// NewContext returns a new context that uses the provided http.Client.
// Provided http.Client is responsible to authorize and authenticate
// the requests made to the Google Cloud APIs.
// It mutates the client's original Transport to append the cloud
// package's user-agent to the outgoing requests.
// You can obtain the project ID from the Google Developers Console,
// https://console.developers.google.com.
func NewContext(projID string, c *http.Client) context.Context {
if c == nil {
panic("invalid nil *http.Client passed to NewContext")
}
return WithContext(context.Background(), projID, c)
}
// WithContext returns a new context in a similar way NewContext does,
// but initiates the new context with the specified parent.
func WithContext(parent context.Context, projID string, c *http.Client) context.Context {
// TODO(bradfitz): delete internal.Transport. It's too wrappy for what it does.
// Do User-Agent some other way.
if _, ok := c.Transport.(*internal.Transport); !ok {
c.Transport = &internal.Transport{Base: c.Transport}
}
return internal.WithContext(parent, projID, c)
}

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// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build go1.3
package metadata
import (
"net"
"time"
)
// This is a workaround for https://github.com/golang/oauth2/issues/70, where
// net.Dialer.KeepAlive is unavailable on Go 1.2 (which App Engine as of
// Jan 2015 still runs).
//
// TODO(bradfitz,jbd,adg): remove this once App Engine supports Go
// 1.3+.
func init() {
go13Dialer = func() *net.Dialer {
return &net.Dialer{
Timeout: 750 * time.Millisecond,
KeepAlive: 30 * time.Second,
}
}
}

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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package metadata provides access to Google Compute Engine (GCE)
// metadata and API service accounts.
//
// This package is a wrapper around the GCE metadata service,
// as documented at https://developers.google.com/compute/docs/metadata.
package metadata
import (
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"strings"
"sync"
"time"
"google.golang.org/cloud/internal"
)
type cachedValue struct {
k string
trim bool
mu sync.Mutex
v string
}
var (
projID = &cachedValue{k: "project/project-id", trim: true}
projNum = &cachedValue{k: "project/numeric-project-id", trim: true}
instID = &cachedValue{k: "instance/id", trim: true}
)
var metaClient = &http.Client{
Transport: &internal.Transport{
Base: &http.Transport{
Dial: dialer().Dial,
ResponseHeaderTimeout: 750 * time.Millisecond,
},
},
}
// go13Dialer is nil until we're using Go 1.3+.
// This is a workaround for https://github.com/golang/oauth2/issues/70, where
// net.Dialer.KeepAlive is unavailable on Go 1.2 (which App Engine as of
// Jan 2015 still runs).
//
// TODO(bradfitz,jbd,adg,dsymonds): remove this once App Engine supports Go
// 1.3+ and go-app-builder also supports 1.3+, or when Go 1.2 is no longer an
// option on App Engine.
var go13Dialer func() *net.Dialer
func dialer() *net.Dialer {
if fn := go13Dialer; fn != nil {
return fn()
}
return &net.Dialer{
Timeout: 750 * time.Millisecond,
}
}
// NotDefinedError is returned when requested metadata is not defined.
//
// The underlying string is the suffix after "/computeMetadata/v1/".
//
// This error is not returned if the value is defined to be the empty
// string.
type NotDefinedError string
func (suffix NotDefinedError) Error() string {
return fmt.Sprintf("metadata: GCE metadata %q not defined", string(suffix))
}
// Get returns a value from the metadata service.
// The suffix is appended to "http://metadata/computeMetadata/v1/".
//
// If the requested metadata is not defined, the returned error will
// be of type NotDefinedError.
func Get(suffix string) (string, error) {
// Using 169.254.169.254 instead of "metadata" here because Go
// binaries built with the "netgo" tag and without cgo won't
// know the search suffix for "metadata" is
// ".google.internal", and this IP address is documented as
// being stable anyway.
url := "http://169.254.169.254/computeMetadata/v1/" + suffix
req, _ := http.NewRequest("GET", url, nil)
req.Header.Set("Metadata-Flavor", "Google")
res, err := metaClient.Do(req)
if err != nil {
return "", err
}
defer res.Body.Close()
if res.StatusCode == http.StatusNotFound {
return "", NotDefinedError(suffix)
}
if res.StatusCode != 200 {
return "", fmt.Errorf("status code %d trying to fetch %s", res.StatusCode, url)
}
all, err := ioutil.ReadAll(res.Body)
if err != nil {
return "", err
}
return string(all), nil
}
func getTrimmed(suffix string) (s string, err error) {
s, err = Get(suffix)
s = strings.TrimSpace(s)
return
}
func (c *cachedValue) get() (v string, err error) {
defer c.mu.Unlock()
c.mu.Lock()
if c.v != "" {
return c.v, nil
}
if c.trim {
v, err = getTrimmed(c.k)
} else {
v, err = Get(c.k)
}
if err == nil {
c.v = v
}
return
}
var onGCE struct {
sync.Mutex
set bool
v bool
}
// OnGCE reports whether this process is running on Google Compute Engine.
func OnGCE() bool {
defer onGCE.Unlock()
onGCE.Lock()
if onGCE.set {
return onGCE.v
}
onGCE.set = true
// We use the DNS name of the metadata service here instead of the IP address
// because we expect that to fail faster in the not-on-GCE case.
res, err := metaClient.Get("http://metadata.google.internal")
if err != nil {
return false
}
onGCE.v = res.Header.Get("Metadata-Flavor") == "Google"
return onGCE.v
}
// ProjectID returns the current instance's project ID string.
func ProjectID() (string, error) { return projID.get() }
// NumericProjectID returns the current instance's numeric project ID.
func NumericProjectID() (string, error) { return projNum.get() }
// InternalIP returns the instance's primary internal IP address.
func InternalIP() (string, error) {
return getTrimmed("instance/network-interfaces/0/ip")
}
// ExternalIP returns the instance's primary external (public) IP address.
func ExternalIP() (string, error) {
return getTrimmed("instance/network-interfaces/0/access-configs/0/external-ip")
}
// Hostname returns the instance's hostname. This will probably be of
// the form "INSTANCENAME.c.PROJECT.internal" but that isn't
// guaranteed.
//
// TODO: what is this defined to be? Docs say "The host name of the
// instance."
func Hostname() (string, error) {
return getTrimmed("network-interfaces/0/ip")
}
// InstanceTags returns the list of user-defined instance tags,
// assigned when initially creating a GCE instance.
func InstanceTags() ([]string, error) {
var s []string
j, err := Get("instance/tags")
if err != nil {
return nil, err
}
if err := json.NewDecoder(strings.NewReader(j)).Decode(&s); err != nil {
return nil, err
}
return s, nil
}
// InstanceID returns the current VM's numeric instance ID.
func InstanceID() (string, error) {
return instID.get()
}
// InstanceAttributes returns the list of user-defined attributes,
// assigned when initially creating a GCE VM instance. The value of an
// attribute can be obtained with InstanceAttributeValue.
func InstanceAttributes() ([]string, error) { return lines("instance/attributes/") }
// ProjectAttributes returns the list of user-defined attributes
// applying to the project as a whole, not just this VM. The value of
// an attribute can be obtained with ProjectAttributeValue.
func ProjectAttributes() ([]string, error) { return lines("project/attributes/") }
func lines(suffix string) ([]string, error) {
j, err := Get(suffix)
if err != nil {
return nil, err
}
s := strings.Split(strings.TrimSpace(j), "\n")
for i := range s {
s[i] = strings.TrimSpace(s[i])
}
return s, nil
}
// InstanceAttributeValue returns the value of the provided VM
// instance attribute.
//
// If the requested attribute is not defined, the returned error will
// be of type NotDefinedError.
//
// InstanceAttributeValue may return ("", nil) if the attribute was
// defined to be the empty string.
func InstanceAttributeValue(attr string) (string, error) {
return Get("instance/attributes/" + attr)
}
// ProjectAttributeValue returns the value of the provided
// project attribute.
//
// If the requested attribute is not defined, the returned error will
// be of type NotDefinedError.
//
// ProjectAttributeValue may return ("", nil) if the attribute was
// defined to be the empty string.
func ProjectAttributeValue(attr string) (string, error) {
return Get("project/attributes/" + attr)
}
// Scopes returns the service account scopes for the given account.
// The account may be empty or the string "default" to use the instance's
// main account.
func Scopes(serviceAccount string) ([]string, error) {
if serviceAccount == "" {
serviceAccount = "default"
}
return lines("instance/service-accounts/" + serviceAccount + "/scopes")
}

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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package internal provides support for the cloud packages.
//
// Users should not import this package directly.
package internal
import (
"fmt"
"net/http"
"sync"
"golang.org/x/net/context"
)
type contextKey struct{}
func WithContext(parent context.Context, projID string, c *http.Client) context.Context {
if c == nil {
panic("nil *http.Client passed to WithContext")
}
if projID == "" {
panic("empty project ID passed to WithContext")
}
return context.WithValue(parent, contextKey{}, &cloudContext{
ProjectID: projID,
HTTPClient: c,
})
}
const userAgent = "gcloud-golang/0.1"
type cloudContext struct {
ProjectID string
HTTPClient *http.Client
mu sync.Mutex // guards svc
svc map[string]interface{} // e.g. "storage" => *rawStorage.Service
}
// Service returns the result of the fill function if it's never been
// called before for the given name (which is assumed to be an API
// service name, like "datastore"). If it has already been cached, the fill
// func is not run.
// It's safe for concurrent use by multiple goroutines.
func Service(ctx context.Context, name string, fill func(*http.Client) interface{}) interface{} {
return cc(ctx).service(name, fill)
}
func (c *cloudContext) service(name string, fill func(*http.Client) interface{}) interface{} {
c.mu.Lock()
defer c.mu.Unlock()
if c.svc == nil {
c.svc = make(map[string]interface{})
} else if v, ok := c.svc[name]; ok {
return v
}
v := fill(c.HTTPClient)
c.svc[name] = v
return v
}
// Transport is an http.RoundTripper that appends
// Google Cloud client's user-agent to the original
// request's user-agent header.
type Transport struct {
// Base represents the actual http.RoundTripper
// the requests will be delegated to.
Base http.RoundTripper
}
// RoundTrip appends a user-agent to the existing user-agent
// header and delegates the request to the base http.RoundTripper.
func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
req = cloneRequest(req)
ua := req.Header.Get("User-Agent")
if ua == "" {
ua = userAgent
} else {
ua = fmt.Sprintf("%s %s", ua, userAgent)
}
req.Header.Set("User-Agent", ua)
return t.Base.RoundTrip(req)
}
// cloneRequest returns a clone of the provided *http.Request.
// The clone is a shallow copy of the struct and its Header map.
func cloneRequest(r *http.Request) *http.Request {
// shallow copy of the struct
r2 := new(http.Request)
*r2 = *r
// deep copy of the Header
r2.Header = make(http.Header)
for k, s := range r.Header {
r2.Header[k] = s
}
return r2
}
func ProjID(ctx context.Context) string {
return cc(ctx).ProjectID
}
func HTTPClient(ctx context.Context) *http.Client {
return cc(ctx).HTTPClient
}
// cc returns the internal *cloudContext (cc) state for a context.Context.
// It panics if the user did it wrong.
func cc(ctx context.Context) *cloudContext {
if c, ok := ctx.Value(contextKey{}).(*cloudContext); ok {
return c
}
panic("invalid context.Context type; it should be created with cloud.NewContext")
}