/
stackdriver.go
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/
stackdriver.go
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package main
import (
"fmt"
"time"
"github.com/go-kit/kit/log"
"github.com/viglesiasce/gke-info/pkg/stackdriver"
"context"
"golang.org/x/oauth2/google"
monitoring "google.golang.org/api/monitoring/v3"
"net/http"
"net/http/httputil"
"cloud.google.com/go/errors"
"cloud.google.com/go/logging"
"cloud.google.com/go/trace"
)
type stackDriverClient struct {
projectID string
serviceName string
version string
monitoringService *monitoring.Service
cloudLogger *logging.Logger
traceClient *trace.Client
errorsClient *errors.Client
}
func NewStackDriverClient(ctx context.Context, projectID string, serviceName string, version string) (*stackDriverClient, error) {
monitoringService, err := newMonitoringService(ctx, projectID, stackdriver.MetricType(serviceName))
if err != nil {
return nil, fmt.Errorf("Failed creating monitoring service: %v", err)
}
cloudLogger, err := newCloudLogger(ctx, projectID)
if err != nil {
return nil, fmt.Errorf("Failed creating cloud logger: %v", err)
}
traceClient, err := newTraceClient(ctx, projectID)
if err != nil {
return nil, fmt.Errorf("Failed creating trace client: %v", err)
}
errorsClient, err := newErrorsClient(ctx, projectID, serviceName, version)
if err != nil {
return nil, fmt.Errorf("Failed creating errors client: %v", err)
}
return &stackDriverClient{projectID, serviceName, version, monitoringService, cloudLogger, traceClient, errorsClient}, nil
}
func newTraceClient(ctx context.Context, projectID string) (*trace.Client, error) {
traceClient, err := trace.NewClient(context.Background(), projectID)
if err != nil {
panic(fmt.Sprintf("Failed to create trace client: %v", err))
}
policy, err := trace.NewLimitedSampler(1.0, 5)
if err != nil {
panic("Failed to create sampler: " + err.Error())
}
traceClient.SetSamplingPolicy(policy)
return traceClient, err
}
func newErrorsClient(ctx context.Context, projectID string, serviceName string, version string) (*errors.Client, error) {
errors, err := errors.NewClient(ctx, projectID, serviceName, version, true)
if err != nil {
return nil, fmt.Errorf("Failed to create errors client: %v", err)
}
return errors, nil
}
func newCloudLogger(ctx context.Context, projectID string) (*logging.Logger, error) {
client, err := logging.NewClient(ctx, projectID)
if err != nil {
panic(fmt.Sprintf("Failed to create logging client: %v", err))
}
logging := client.Logger("gceme-log")
return logging, nil
}
func newMonitoringService(ctx context.Context, projectID string, metricType string) (*monitoring.Service, error) {
hc, err := google.DefaultClient(ctx, monitoring.MonitoringScope)
if err != nil {
return nil, err
}
monitoringService, err := monitoring.New(hc)
if err != nil {
return nil, fmt.Errorf("failed to create monitoring service: %v", err)
}
if err := stackdriver.CreateCustomMetric(monitoringService, projectID, metricType, "s"); err != nil {
return nil, fmt.Errorf("failed to create custom metric: %v", err)
}
for {
resp, err := stackdriver.GetCustomMetric(monitoringService, projectID, metricType)
if err != nil {
return nil, fmt.Errorf("failed to retrieve custom metric: %v", err)
}
if len(resp.MetricDescriptors) != 0 {
break
}
time.Sleep(2 * time.Second)
}
return monitoringService, nil
}
type stackDriverMiddleware struct {
context context.Context
sdc *stackDriverClient
logger log.Logger
next commonService
}
func logRequest(method string, r *http.Request, begin time.Time, mw stackDriverMiddleware) {
elapsed := time.Since(begin)
// Log request
raw, _ := httputil.DumpRequest(r, true)
_ = mw.logger.Log(
"method", method,
"took", elapsed,
"request", raw,
)
}
func writeMetric(endpoint string, begin time.Time, mw stackDriverMiddleware) {
if err := stackdriver.WriteTimeSeriesValue(mw.sdc.monitoringService, mw.sdc.projectID,
mw.sdc.serviceName+"/"+endpoint, time.Since(begin).Seconds()); err != nil {
fmt.Printf("Failed to send metric value: %v", err)
}
}
func (mw stackDriverMiddleware) Version(r *http.Request) (version string) {
// Catch any panics and report them to Error Reporting service
endpoint := "version"
defer mw.sdc.errorsClient.Catch(mw.context)
defer writeMetric(endpoint, time.Now(), mw)
defer logRequest(endpoint, r, time.Now(), mw)
version = mw.next.Version(r)
return
}
func (mw stackDriverMiddleware) MetaData(r *http.Request) (instance *Instance) {
// Catch any panics and report them to Error Reporting service
endpoint := "metadata"
defer mw.sdc.errorsClient.Catch(mw.context)
defer writeMetric(endpoint, time.Now(), mw)
defer logRequest(endpoint, r, time.Now(), mw)
instance = mw.next.MetaData(r)
return
}
func (mw stackDriverMiddleware) Health(r *http.Request) (status string) {
// Catch any panics and report them to Error Reporting service
endpoint := "health"
defer mw.sdc.errorsClient.Catch(mw.context)
defer writeMetric(endpoint, time.Now(), mw)
defer logRequest(endpoint, r, time.Now(), mw)
status = mw.next.Health(r)
return
}
func (mw stackDriverMiddleware) Error(r *http.Request) (err error) {
// Catch any panics and report them to Error Reporting service
endpoint := "error"
defer mw.sdc.errorsClient.Catch(mw.context)
defer writeMetric(endpoint, time.Now(), mw)
defer logRequest(endpoint, r, time.Now(), mw)
err = mw.next.Error(r)
return
}
func (mw stackDriverMiddleware) Home(r *http.Request) (doc string) {
// Catch any panics and report them to Error Reporting service
endpoint := "home"
defer mw.sdc.errorsClient.Catch(mw.context)
defer writeMetric(endpoint, time.Now(), mw)
defer logRequest(endpoint, r, time.Now(), mw)
doc = mw.next.Home(r)
return
}