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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| // Package observe provides functions | ||
| // that help with setting tracing/metrics | ||
| // in cloud providers, mainly GCP. | ||
| package observe | ||
|
|
||
| import ( | ||
| "os" | ||
|
|
||
| "contrib.go.opencensus.io/exporter/stackdriver" | ||
| "contrib.go.opencensus.io/exporter/stackdriver/monitoredresource" | ||
| "go.opencensus.io/exporter/prometheus" | ||
| ) | ||
|
|
||
| // NewStackDriverExporter will return the tracing and metrics through | ||
| // the stack driver exporter, if exists in the underlying platform. | ||
| // If exporter is registered, it returns the exporter so you can register | ||
| // it and ensure to call Flush on termination. | ||
| func NewStackDriverExporter(projectID string, onErr func(error)) (*stackdriver.Exporter, error) { | ||
| _, svcName, svcVersion := GetServiceInfo() | ||
| opts := getSDOpts(projectID, svcName, svcVersion, onErr) | ||
| if opts == nil { | ||
| return nil, nil | ||
| } | ||
| return stackdriver.NewExporter(*opts) | ||
| } | ||
|
|
||
| // NewPrometheusExporter return a prometheus Exporter for OpenCensus. | ||
| func NewPrometheusExporter(opts prometheus.Options) (*prometheus.Exporter, error) { | ||
| return prometheus.NewExporter(opts) | ||
| } | ||
|
|
||
| // GoogleProjectID returns the GCP Project ID | ||
| // that can be used to instantiate various | ||
| // GCP clients such as Stack Driver. | ||
| func GoogleProjectID() string { | ||
| return os.Getenv("GOOGLE_CLOUD_PROJECT") | ||
| } | ||
|
|
||
| // IsGAE tells you whether your program is running | ||
| // within the App Engine platform. | ||
| func IsGAE() bool { | ||
| return os.Getenv("GAE_DEPLOYMENT_ID") != "" | ||
| } | ||
|
|
||
| // GetGAEInfo returns the GCP Project ID, | ||
| // the service, and the version of the application. | ||
| func GetGAEInfo() (projectID, service, version string) { | ||
| return GoogleProjectID(), | ||
| os.Getenv("GAE_SERVICE"), | ||
| os.Getenv("GAE_VERSION") | ||
| } | ||
|
|
||
| // GetServiceInfo returns the GCP Project ID, | ||
| // the service name and version (gae or through | ||
| // GAE_SERVICE/GAE_VERSION env vars) | ||
| func GetServiceInfo() (projectID, service, version string) { | ||
| projectID = GoogleProjectID() | ||
| if IsGAE() { | ||
| _, service, version = GetGAEInfo() | ||
| } else if n, v := os.Getenv("SERVICE_NAME"), os.Getenv("SERVICE_VERSION"); n != "" { | ||
| service, version = n, v | ||
| } | ||
| return projectID, service, version | ||
| } | ||
|
|
||
| // getSDOpts returns Stack Driver Options that you can pass directly | ||
| // to the OpenCensus exporter or other libraries. | ||
| func getSDOpts(projectID, service, version string, onErr func(err error)) *stackdriver.Options { | ||
| var mr monitoredresource.Interface | ||
| if m := monitoredresource.Autodetect(); m != nil { | ||
| mr = m | ||
| } else if IsGAE() { | ||
| mr = gaeInterface{ | ||
| typ: "gae_app", | ||
| labels: map[string]string{ | ||
| "project_id": projectID, | ||
| }, | ||
| } | ||
| } | ||
| if mr == nil { | ||
| return nil | ||
| } | ||
|
|
||
| return &stackdriver.Options{ | ||
| ProjectID: projectID, | ||
| MonitoredResource: mr, | ||
| OnError: onErr, | ||
| DefaultTraceAttributes: map[string]interface{}{ | ||
| "service": service, | ||
| "version": version, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| // IsGCPEnabled returns whether the running application | ||
| // is inside GCP or has access to its products. | ||
| func IsGCPEnabled() bool { | ||
| return monitoredresource.Autodetect() != nil || IsGAE() | ||
| } | ||
|
|
||
| // implements contrib.go.opencensus.io/exporter/stackdriver/monitoredresource.Interface | ||
| type gaeInterface struct { | ||
| typ string | ||
| labels map[string]string | ||
| } | ||
|
|
||
| func (g gaeInterface) MonitoredResource() (string, map[string]string) { | ||
| return g.typ, g.labels | ||
| } |
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