From baf7141d1dd0f99d561a2197a909c66dd389809d Mon Sep 17 00:00:00 2001 From: Niall Sheridan Date: Sat, 8 Oct 2016 16:02:50 -0500 Subject: Update dependencies --- .../cloud/compute/metadata/metadata.go | 438 --------------------- 1 file changed, 438 deletions(-) delete mode 100644 vendor/google.golang.org/cloud/compute/metadata/metadata.go (limited to 'vendor/google.golang.org/cloud/compute/metadata/metadata.go') diff --git a/vendor/google.golang.org/cloud/compute/metadata/metadata.go b/vendor/google.golang.org/cloud/compute/metadata/metadata.go deleted file mode 100644 index b791790..0000000 --- a/vendor/google.golang.org/cloud/compute/metadata/metadata.go +++ /dev/null @@ -1,438 +0,0 @@ -// 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 "google.golang.org/cloud/compute/metadata" - -import ( - "encoding/json" - "fmt" - "io/ioutil" - "net" - "net/http" - "net/url" - "os" - "runtime" - "strings" - "sync" - "time" - - "golang.org/x/net/context" - "golang.org/x/net/context/ctxhttp" - - "google.golang.org/cloud/internal" -) - -const ( - // metadataIP is the documented metadata server IP address. - metadataIP = "169.254.169.254" - - // metadataHostEnv is the environment variable specifying the - // GCE metadata hostname. If empty, the default value of - // metadataIP ("169.254.169.254") is used instead. - // This is variable name is not defined by any spec, as far as - // I know; it was made up for the Go package. - metadataHostEnv = "GCE_METADATA_HOST" -) - -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: (&net.Dialer{ - Timeout: 2 * time.Second, - KeepAlive: 30 * time.Second, - }).Dial, - ResponseHeaderTimeout: 2 * time.Second, - }, - }, - } - subscribeClient = &http.Client{ - Transport: &internal.Transport{ - Base: &http.Transport{ - Dial: (&net.Dialer{ - Timeout: 2 * time.Second, - KeepAlive: 30 * time.Second, - }).Dial, - }, - }, - } -) - -// 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://${GCE_METADATA_HOST}/computeMetadata/v1/". -// -// If the GCE_METADATA_HOST environment variable is not defined, a default of -// 169.254.169.254 will be used instead. -// -// If the requested metadata is not defined, the returned error will -// be of type NotDefinedError. -func Get(suffix string) (string, error) { - val, _, err := getETag(metaClient, suffix) - return val, err -} - -// getETag returns a value from the metadata service as well as the associated -// ETag using the provided client. This func is otherwise equivalent to Get. -func getETag(client *http.Client, suffix string) (value, etag string, err error) { - // Using a fixed IP makes it very difficult to spoof the metadata service in - // a container, which is an important use-case for local testing of cloud - // deployments. To enable spoofing of the metadata service, the environment - // variable GCE_METADATA_HOST is first inspected to decide where metadata - // requests shall go. - host := os.Getenv(metadataHostEnv) - if host == "" { - // 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. - host = metadataIP - } - url := "http://" + host + "/computeMetadata/v1/" + suffix - req, _ := http.NewRequest("GET", url, nil) - req.Header.Set("Metadata-Flavor", "Google") - res, err := client.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), res.Header.Get("Etag"), 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 ( - onGCEOnce sync.Once - onGCE bool -) - -// OnGCE reports whether this process is running on Google Compute Engine. -func OnGCE() bool { - onGCEOnce.Do(initOnGCE) - return onGCE -} - -func initOnGCE() { - onGCE = testOnGCE() -} - -func testOnGCE() bool { - // The user explicitly said they're on GCE, so trust them. - if os.Getenv(metadataHostEnv) != "" { - return true - } - - ctx, cancel := context.WithCancel(context.Background()) - defer cancel() - - resc := make(chan bool, 2) - - // Try two strategies in parallel. - // See https://github.com/GoogleCloudPlatform/gcloud-golang/issues/194 - go func() { - res, err := ctxhttp.Get(ctx, metaClient, "http://"+metadataIP) - if err != nil { - resc <- false - return - } - defer res.Body.Close() - resc <- res.Header.Get("Metadata-Flavor") == "Google" - }() - - go func() { - addrs, err := net.LookupHost("metadata.google.internal") - if err != nil || len(addrs) == 0 { - resc <- false - return - } - resc <- strsContains(addrs, metadataIP) - }() - - tryHarder := systemInfoSuggestsGCE() - if tryHarder { - res := <-resc - if res { - // The first strategy succeeded, so let's use it. - return true - } - // Wait for either the DNS or metadata server probe to - // contradict the other one and say we are running on - // GCE. Give it a lot of time to do so, since the system - // info already suggests we're running on a GCE BIOS. - timer := time.NewTimer(5 * time.Second) - defer timer.Stop() - select { - case res = <-resc: - return res - case <-timer.C: - // Too slow. Who knows what this system is. - return false - } - } - - // There's no hint from the system info that we're running on - // GCE, so use the first probe's result as truth, whether it's - // true or false. The goal here is to optimize for speed for - // users who are NOT running on GCE. We can't assume that - // either a DNS lookup or an HTTP request to a blackholed IP - // address is fast. Worst case this should return when the - // metaClient's Transport.ResponseHeaderTimeout or - // Transport.Dial.Timeout fires (in two seconds). - return <-resc -} - -// systemInfoSuggestsGCE reports whether the local system (without -// doing network requests) suggests that we're running on GCE. If this -// returns true, testOnGCE tries a bit harder to reach its metadata -// server. -func systemInfoSuggestsGCE() bool { - if runtime.GOOS != "linux" { - // We don't have any non-Linux clues available, at least yet. - return false - } - slurp, _ := ioutil.ReadFile("/sys/class/dmi/id/product_name") - name := strings.TrimSpace(string(slurp)) - return name == "Google" || name == "Google Compute Engine" -} - -// Subscribe subscribes to a value from the metadata service. -// The suffix is appended to "http://${GCE_METADATA_HOST}/computeMetadata/v1/". -// The suffix may contain query parameters. -// -// Subscribe calls fn with the latest metadata value indicated by the provided -// suffix. If the metadata value is deleted, fn is called with the empty string -// and ok false. Subscribe blocks until fn returns a non-nil error or the value -// is deleted. Subscribe returns the error value returned from the last call to -// fn, which may be nil when ok == false. -func Subscribe(suffix string, fn func(v string, ok bool) error) error { - const failedSubscribeSleep = time.Second * 5 - - // First check to see if the metadata value exists at all. - val, lastETag, err := getETag(subscribeClient, suffix) - if err != nil { - return err - } - - if err := fn(val, true); err != nil { - return err - } - - ok := true - if strings.ContainsRune(suffix, '?') { - suffix += "&wait_for_change=true&last_etag=" - } else { - suffix += "?wait_for_change=true&last_etag=" - } - for { - val, etag, err := getETag(subscribeClient, suffix+url.QueryEscape(lastETag)) - if err != nil { - if _, deleted := err.(NotDefinedError); !deleted { - time.Sleep(failedSubscribeSleep) - continue // Retry on other errors. - } - ok = false - } - lastETag = etag - - if err := fn(val, ok); err != nil || !ok { - return err - } - } -} - -// 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 be of the form -// ".c..internal". -func Hostname() (string, error) { - return getTrimmed("instance/hostname") -} - -// 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() -} - -// InstanceName returns the current VM's instance ID string. -func InstanceName() (string, error) { - host, err := Hostname() - if err != nil { - return "", err - } - return strings.Split(host, ".")[0], nil -} - -// Zone returns the current VM's zone, such as "us-central1-b". -func Zone() (string, error) { - zone, err := getTrimmed("instance/zone") - // zone is of the form "projects//zones/". - if err != nil { - return "", err - } - return zone[strings.LastIndex(zone, "/")+1:], nil -} - -// 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") -} - -func strsContains(ss []string, s string) bool { - for _, v := range ss { - if v == s { - return true - } - } - return false -} -- cgit v1.2.3