prober/go/prober/main.go - buildbot - Git at Google

 // Prober is an HTTP prober that periodically sends out HTTP requests to specified
 // endpoints and reports if the returned results match the expectations. The results
 // of the probe, including latency, are recored in metrics2.
 // See probers.json as an example of the config file format.
 package main

 import (
 	"encoding/json"
 	"flag"
 	"fmt"
 	"io"
 	"net"
 	"net/http"
 	"net/url"
 	"os"
 	"strings"
 	"time"

 	"go.skia.org/infra/go/auth"
 	"go.skia.org/infra/go/common"
 	"go.skia.org/infra/go/httputils"
 	"go.skia.org/infra/go/issues"
 	"go.skia.org/infra/go/metrics2"
 	"go.skia.org/infra/go/sklog"
 	"go.skia.org/infra/go/util"
 )

 // flags
 var (
 	config   = flag.String("config", "probers.json", "Comma separated names of prober config files.")
 	local    = flag.Bool("local", false, "Running locally if true. As opposed to in production.")
 	promPort = flag.String("prom_port", ":10110", "Metrics service address (e.g., ':10110')")
 	runEvery = flag.Duration("run_every", 1*time.Minute, "How often to run the probes.")
 	testing  = flag.Bool("testing", false, "Set to true for local testing.")
 )

 var (
 	// responseTesters is a mapping of names to functions that test response bodies.
 	responseTesters = map[string]ResponseTester{
 		"nonZeroContenLength": nonZeroContenLength,
 		"skfiddleJSONBad":     skfiddleJSONBad,
 		"skfiddleJSONGood":    skfiddleJSONGood,
 		"validJSON":           validJSON,
 	}
 )

 const (
 	DIAL_TIMEOUT         = time.Duration(5 * time.Second)
 	REQUEST_TIMEOUT      = time.Duration(30 * time.Second)
 	ISSUE_TRACKER_PERIOD = 15 * time.Minute
 )

 // ResponseTester tests the response from a probe and returns true if it passes all tests.
 type ResponseTester func(io.Reader, http.Header) bool

 // Probe is a single endpoint we are probing.
 type Probe struct {
 	// URL is the HTTP URL to probe.
 	URLs []string `json:"urls"`

 	// Method is the HTTP method to use when probing.
 	Method string `json:"method"`

 	// Expected is the list of expected HTTP status code, i.e. [200, 201]
 	Expected []int `json:"expected"`

 	// Body is the body of the request to send if the method is POST.
 	Body string `json:"body"`

 	// The mimetype of the Body.
 	MimeType string `json:"mimetype"`

 	// The body testing function we should use.
 	ResponseTestName string `json:"responsetest"`

 	responseTest ResponseTester

 	//      map[url]metric.
 	failure map[string]metrics2.Int64Metric
 	latency map[string]metrics2.Int64Metric // Latency in ms.
 }

 // Probes is all the probes that are to be run.
 type Probes map[string]*Probe

 func readConfigFiles(filenames string) (Probes, error) {
 	allProbes := Probes{}
 	for _, filename := range strings.Split(filenames, ",") {
 		file, err := os.Open(filename)
 		if err != nil {
 			return nil, fmt.Errorf("Failed to open config file: %s", err)
 		}
 		d := json.NewDecoder(file)
 		p := &Probes{}
 		if err := d.Decode(p); err != nil {
 			return nil, fmt.Errorf("Failed to decode JSON in config file: %s", err)
 		}
 		for k, v := range *p {
 			v.failure = map[string]metrics2.Int64Metric{}
 			v.latency = map[string]metrics2.Int64Metric{}
 			if f, ok := responseTesters[v.ResponseTestName]; ok {
 				v.responseTest = f
 				sklog.Infof("Found a request test for %s", k)
 			}
 			allProbes[k] = v
 		}
 	}
 	return allProbes, nil
 }

 // In returns true if n is found in list.
 func In(n int, list []int) bool {
 	for _, x := range list {
 		if x == n {
 			return true
 		}
 	}
 	return false
 }

 // dialTimeout is a dialer that sets a timeout.
 func dialTimeout(network, addr string) (net.Conn, error) {
 	return net.DialTimeout(network, addr, DIAL_TIMEOUT)
 }

 // nonZeroContenLength tests whether the Content-Length value is non-zero.
 func nonZeroContenLength(r io.Reader, headers http.Header) bool {
 	return headers.Get("Content-Length") != "0"
 }

 // validJSON tests whether the response contains valid JSON.
 func validJSON(r io.Reader, headers http.Header) bool {
 	var i interface{}
 	return json.NewDecoder(r).Decode(&i) == nil
 }

 type skfiddleResp struct {
 	CompileErrors []interface{} `json:"compile_errors"`
 }

 // skfiddleJSONGood tests that the compile completed w/o error.
 func skfiddleJSONGood(r io.Reader, headers http.Header) bool {
 	dec := json.NewDecoder(r)
 	s := skfiddleResp{
 		CompileErrors: []interface{}{},
 	}
 	if err := dec.Decode(&s); err != nil {
 		sklog.Warningf("Failed to decode skfiddle JSON: %#v %s", s, err)
 		return false
 	}
 	sklog.Infof("%#v", s)
 	return len(s.CompileErrors) == 0
 }

 // skfiddleJSONBad tests that the compile completed w/error.
 func skfiddleJSONBad(r io.Reader, headers http.Header) bool {
 	dec := json.NewDecoder(r)
 	s := skfiddleResp{
 		CompileErrors: []interface{}{},
 	}
 	if err := dec.Decode(&s); err != nil {
 		sklog.Warningf("Failed to decode skfiddle JSON: %#v %s", s, err)
 		return false
 	}
 	sklog.Infof("%#v", s)
 	return len(s.CompileErrors) != 0
 }

 // decodeJSONObject reads a JSON object from r and returns the resulting object. Returns nil if the
 // JSON is invalid or can't be decoded to a map[string]interface{}.
 func decodeJSONObject(r io.Reader) map[string]interface{} {
 	var obj map[string]interface{}
 	if json.NewDecoder(r).Decode(&obj) != nil {
 		return nil
 	}
 	return obj
 }

 // hasKeys tests that the given decoded JSON object has at least the provided keys. If obj is nil,
 // returns false.
 func hasKeys(obj map[string]interface{}, keys []string) bool {
 	if obj == nil {
 		return false
 	}
 	for _, key := range keys {
 		if _, ok := obj[key]; !ok {
 			return false
 		}
 	}
 	return true
 }

 // monitorIssueTracker reads the counts for all the types of issues in the Skia
 // issue tracker (bugs.chromium.org/p/skia) and stuffs the counts into Graphite.
 func monitorIssueTracker(c *http.Client) {
 	// IssueStatus has all the info we need to capture and record a single issue status. I.e. capture
 	// the count of all issues with a status of "New".
 	type IssueStatus struct {
 		Name   string
 		Metric metrics2.Int64Metric
 		URL    string
 	}

 	allIssueStatusLabels := []string{
 		"New", "Accepted", "Unconfirmed", "Started", "Fixed", "Verified", "Invalid", "WontFix", "Done", "Available", "Assigned",
 	}

 	issueStatus := []*IssueStatus{}
 	for _, issueName := range allIssueStatusLabels {
 		q := url.Values{}
 		q.Set("fields", "totalResults")
 		q.Set("status", issueName)
 		issueStatus = append(issueStatus, &IssueStatus{
 			Name:   issueName,
 			Metric: metrics2.GetInt64Metric("issues", map[string]string{"status": strings.ToLower(issueName)}),
 			URL:    issues.MONORAIL_BASE_URL + "?" + q.Encode(),
 		})
 	}

 	liveness := metrics2.NewLiveness("issue-tracker")
 	for _ = range time.Tick(ISSUE_TRACKER_PERIOD) {
 		for _, issue := range issueStatus {
 			resp, err := c.Get(issue.URL)
 			if err != nil {
 				sklog.Errorf("Failed to retrieve response from %s: %s", issue.URL, err)
 				continue
 			}
 			jsonResp := map[string]int64{}
 			dec := json.NewDecoder(resp.Body)
 			if err := dec.Decode(&jsonResp); err != nil {
 				sklog.Warningf("Failed to decode JSON response: %s", err)
 				util.Close(resp.Body)
 				continue
 			}
 			issue.Metric.Update(jsonResp["totalResults"])
 			sklog.Infof("Num Issues: %s - %d", issue.Name, jsonResp["totalResults"])
 			if err == nil && resp.Body != nil {
 				util.Close(resp.Body)
 			}
 		}
 		liveness.Reset()
 	}
 }

 func probeOneRound(cfg Probes, c *http.Client) {
 	var resp *http.Response
 	var begin time.Time
 	for name, probe := range cfg {
 		for _, url := range probe.URLs {
 			sklog.Infof("Probe: %s Starting fail value: %d", name, probe.failure[url].Get())
 			begin = time.Now()
 			var err error
 			if probe.Method == "GET" {
 				resp, err = c.Get(url)
 			} else if probe.Method == "HEAD" {
 				resp, err = c.Head(url)
 			} else if probe.Method == "POST" {
 				resp, err = c.Post(url, probe.MimeType, strings.NewReader(probe.Body))
 			} else {
 				sklog.Errorf("Error: unknown method: %s", probe.Method)
 				continue
 			}
 			d := time.Since(begin)
 			probe.latency[url].Update(d.Nanoseconds() / int64(time.Millisecond))
 			if err != nil {
 				sklog.Warningf("Failed to make request: Name: %s URL: %s Error: %s", name, url, err)
 				probe.failure[url].Update(1)
 				continue
 			}
 			responseTestResults := true
 			if probe.responseTest != nil && resp.Body != nil {
 				responseTestResults = probe.responseTest(resp.Body, resp.Header)
 			}
 			if resp.Body != nil {
 				util.Close(resp.Body)
 			}
 			// TODO(jcgregorio) Save the last N responses and present them in a web UI.

 			if !In(resp.StatusCode, probe.Expected) {
 				sklog.Warningf("Got wrong status code: Name %s Got %d Want %v", name, resp.StatusCode, probe.Expected)
 				probe.failure[url].Update(1)
 				continue
 			}
 			if !responseTestResults {
 				sklog.Warningf("Response test failed: Name: %s %#v", name, probe)
 				probe.failure[url].Update(1)
 				continue
 			}

 			probe.failure[url].Update(0)
 		}
 	}
 }

 func main() {
 	defer common.LogPanic()
 	common.InitWithMust(
 		"probeserver",
 		common.PrometheusOpt(promPort),
 		common.CloudLoggingOpt(),
 	)

 	client, err := auth.NewJWTServiceAccountClient("", "", &http.Transport{Dial: httputils.DialTimeout}, "https://www.googleapis.com/auth/userinfo.email")
 	if err != nil {
 		sklog.Fatalf("Failed to create client for talking to the issue tracker: %s", err)
 	}
 	go monitorIssueTracker(client)

 	liveness := metrics2.NewLiveness("probes")

 	// TODO(jcgregorio) Monitor config file and reload if it changes.
 	cfg, err := readConfigFiles(*config)
 	if err != nil {
 		sklog.Fatalln("Failed to read config file: ", err)
 	}
 	sklog.Infoln("Successfully read config file.")
 	// Register counters for each probe.
 	for name, probe := range cfg {
 		for _, url := range probe.URLs {
 			probe.failure[url] = metrics2.GetInt64Metric("prober", map[string]string{"type": "failure", "probename": name, "url": url})
 			probe.latency[url] = metrics2.GetInt64Metric("prober", map[string]string{"type": "latency", "probename": name, "url": url})
 		}
 	}

 	// Create a client that uses our dialer with a timeout.
 	c := &http.Client{
 		Transport: &http.Transport{
 			Dial: dialTimeout,
 		},
 		Timeout: REQUEST_TIMEOUT,
 	}
 	probeOneRound(cfg, c)
 	for _ = range time.Tick(*runEvery) {
 		probeOneRound(cfg, c)
 		liveness.Reset()
 	}
 }
	// Prober is an HTTP prober that periodically sends out HTTP requests to specified
	// endpoints and reports if the returned results match the expectations. The results
	// of the probe, including latency, are recored in metrics2.
	// See probers.json as an example of the config file format.
	package main

	import (
	"encoding/json"
	"flag"
	"fmt"
	"io"
	"net"
	"net/http"
	"net/url"
	"os"
	"strings"
	"time"

	"go.skia.org/infra/go/auth"
	"go.skia.org/infra/go/common"
	"go.skia.org/infra/go/httputils"
	"go.skia.org/infra/go/issues"
	"go.skia.org/infra/go/metrics2"
	"go.skia.org/infra/go/sklog"
	"go.skia.org/infra/go/util"
	)

	// flags
	var (
	config = flag.String("config", "probers.json", "Comma separated names of prober config files.")
	local = flag.Bool("local", false, "Running locally if true. As opposed to in production.")
	promPort = flag.String("prom_port", ":10110", "Metrics service address (e.g., ':10110')")
	runEvery = flag.Duration("run_every", 1*time.Minute, "How often to run the probes.")
	testing = flag.Bool("testing", false, "Set to true for local testing.")
	)

	var (
	// responseTesters is a mapping of names to functions that test response bodies.
	responseTesters = map[string]ResponseTester{
	"nonZeroContenLength": nonZeroContenLength,
	"skfiddleJSONBad": skfiddleJSONBad,
	"skfiddleJSONGood": skfiddleJSONGood,
	"validJSON": validJSON,
	}
	)

	const (
	DIAL_TIMEOUT = time.Duration(5 * time.Second)
	REQUEST_TIMEOUT = time.Duration(30 * time.Second)
	ISSUE_TRACKER_PERIOD = 15 * time.Minute
	)

	// ResponseTester tests the response from a probe and returns true if it passes all tests.
	type ResponseTester func(io.Reader, http.Header) bool

	// Probe is a single endpoint we are probing.
	type Probe struct {
	// URL is the HTTP URL to probe.
	URLs []string `json:"urls"`

	// Method is the HTTP method to use when probing.
	Method string `json:"method"`

	// Expected is the list of expected HTTP status code, i.e. [200, 201]
	Expected []int `json:"expected"`

	// Body is the body of the request to send if the method is POST.
	Body string `json:"body"`

	// The mimetype of the Body.
	MimeType string `json:"mimetype"`

	// The body testing function we should use.
	ResponseTestName string `json:"responsetest"`

	responseTest ResponseTester

	// map[url]metric.
	failure map[string]metrics2.Int64Metric
	latency map[string]metrics2.Int64Metric // Latency in ms.
	}

	// Probes is all the probes that are to be run.
	type Probes map[string]*Probe

	func readConfigFiles(filenames string) (Probes, error) {
	allProbes := Probes{}
	for _, filename := range strings.Split(filenames, ",") {
	file, err := os.Open(filename)
	if err != nil {
	return nil, fmt.Errorf("Failed to open config file: %s", err)
	}
	d := json.NewDecoder(file)
	p := &Probes{}
	if err := d.Decode(p); err != nil {
	return nil, fmt.Errorf("Failed to decode JSON in config file: %s", err)
	}
	for k, v := range *p {
	v.failure = map[string]metrics2.Int64Metric{}
	v.latency = map[string]metrics2.Int64Metric{}
	if f, ok := responseTesters[v.ResponseTestName]; ok {
	v.responseTest = f
	sklog.Infof("Found a request test for %s", k)
	}
	allProbes[k] = v
	}
	}
	return allProbes, nil
	}

	// In returns true if n is found in list.
	func In(n int, list []int) bool {
	for _, x := range list {
	if x == n {
	return true
	}
	}
	return false
	}

	// dialTimeout is a dialer that sets a timeout.
	func dialTimeout(network, addr string) (net.Conn, error) {
	return net.DialTimeout(network, addr, DIAL_TIMEOUT)
	}

	// nonZeroContenLength tests whether the Content-Length value is non-zero.
	func nonZeroContenLength(r io.Reader, headers http.Header) bool {
	return headers.Get("Content-Length") != "0"
	}

	// validJSON tests whether the response contains valid JSON.
	func validJSON(r io.Reader, headers http.Header) bool {
	var i interface{}
	return json.NewDecoder(r).Decode(&i) == nil
	}

	type skfiddleResp struct {
	CompileErrors []interface{} `json:"compile_errors"`
	}

	// skfiddleJSONGood tests that the compile completed w/o error.
	func skfiddleJSONGood(r io.Reader, headers http.Header) bool {
	dec := json.NewDecoder(r)
	s := skfiddleResp{
	CompileErrors: []interface{}{},
	}
	if err := dec.Decode(&s); err != nil {
	sklog.Warningf("Failed to decode skfiddle JSON: %#v %s", s, err)
	return false
	}
	sklog.Infof("%#v", s)
	return len(s.CompileErrors) == 0
	}

	// skfiddleJSONBad tests that the compile completed w/error.
	func skfiddleJSONBad(r io.Reader, headers http.Header) bool {
	dec := json.NewDecoder(r)
	s := skfiddleResp{
	CompileErrors: []interface{}{},
	}
	if err := dec.Decode(&s); err != nil {
	sklog.Warningf("Failed to decode skfiddle JSON: %#v %s", s, err)
	return false
	}
	sklog.Infof("%#v", s)
	return len(s.CompileErrors) != 0
	}

	// decodeJSONObject reads a JSON object from r and returns the resulting object. Returns nil if the
	// JSON is invalid or can't be decoded to a map[string]interface{}.
	func decodeJSONObject(r io.Reader) map[string]interface{} {
	var obj map[string]interface{}
	if json.NewDecoder(r).Decode(&obj) != nil {
	return nil
	}
	return obj
	}

	// hasKeys tests that the given decoded JSON object has at least the provided keys. If obj is nil,
	// returns false.
	func hasKeys(obj map[string]interface{}, keys []string) bool {
	if obj == nil {
	return false
	}
	for _, key := range keys {
	if _, ok := obj[key]; !ok {
	return false
	}
	}
	return true
	}

	// monitorIssueTracker reads the counts for all the types of issues in the Skia
	// issue tracker (bugs.chromium.org/p/skia) and stuffs the counts into Graphite.
	func monitorIssueTracker(c *http.Client) {
	// IssueStatus has all the info we need to capture and record a single issue status. I.e. capture
	// the count of all issues with a status of "New".
	type IssueStatus struct {
	Name string
	Metric metrics2.Int64Metric
	URL string
	}

	allIssueStatusLabels := []string{
	"New", "Accepted", "Unconfirmed", "Started", "Fixed", "Verified", "Invalid", "WontFix", "Done", "Available", "Assigned",
	}

	issueStatus := []*IssueStatus{}
	for _, issueName := range allIssueStatusLabels {
	q := url.Values{}
	q.Set("fields", "totalResults")
	q.Set("status", issueName)
	issueStatus = append(issueStatus, &IssueStatus{
	Name: issueName,
	Metric: metrics2.GetInt64Metric("issues", map[string]string{"status": strings.ToLower(issueName)}),
	URL: issues.MONORAIL_BASE_URL + "?" + q.Encode(),
	})
	}

	liveness := metrics2.NewLiveness("issue-tracker")
	for _ = range time.Tick(ISSUE_TRACKER_PERIOD) {
	for _, issue := range issueStatus {
	resp, err := c.Get(issue.URL)
	if err != nil {
	sklog.Errorf("Failed to retrieve response from %s: %s", issue.URL, err)
	continue
	}
	jsonResp := map[string]int64{}
	dec := json.NewDecoder(resp.Body)
	if err := dec.Decode(&jsonResp); err != nil {
	sklog.Warningf("Failed to decode JSON response: %s", err)
	util.Close(resp.Body)
	continue
	}
	issue.Metric.Update(jsonResp["totalResults"])
	sklog.Infof("Num Issues: %s - %d", issue.Name, jsonResp["totalResults"])
	if err == nil && resp.Body != nil {
	util.Close(resp.Body)
	}
	}
	liveness.Reset()
	}
	}

	func probeOneRound(cfg Probes, c *http.Client) {
	var resp *http.Response
	var begin time.Time
	for name, probe := range cfg {
	for _, url := range probe.URLs {
	sklog.Infof("Probe: %s Starting fail value: %d", name, probe.failure[url].Get())
	begin = time.Now()
	var err error
	if probe.Method == "GET" {
	resp, err = c.Get(url)
	} else if probe.Method == "HEAD" {
	resp, err = c.Head(url)
	} else if probe.Method == "POST" {
	resp, err = c.Post(url, probe.MimeType, strings.NewReader(probe.Body))
	} else {
	sklog.Errorf("Error: unknown method: %s", probe.Method)
	continue
	}
	d := time.Since(begin)
	probe.latency[url].Update(d.Nanoseconds() / int64(time.Millisecond))
	if err != nil {
	sklog.Warningf("Failed to make request: Name: %s URL: %s Error: %s", name, url, err)
	probe.failure[url].Update(1)
	continue
	}
	responseTestResults := true
	if probe.responseTest != nil && resp.Body != nil {
	responseTestResults = probe.responseTest(resp.Body, resp.Header)
	}
	if resp.Body != nil {
	util.Close(resp.Body)
	}
	// TODO(jcgregorio) Save the last N responses and present them in a web UI.

	if !In(resp.StatusCode, probe.Expected) {
	sklog.Warningf("Got wrong status code: Name %s Got %d Want %v", name, resp.StatusCode, probe.Expected)
	probe.failure[url].Update(1)
	continue
	}
	if !responseTestResults {
	sklog.Warningf("Response test failed: Name: %s %#v", name, probe)
	probe.failure[url].Update(1)
	continue
	}

	probe.failure[url].Update(0)
	}
	}
	}

	func main() {
	defer common.LogPanic()
	common.InitWithMust(
	"probeserver",
	common.PrometheusOpt(promPort),
	common.CloudLoggingOpt(),
	)

	client, err := auth.NewJWTServiceAccountClient("", "", &http.Transport{Dial: httputils.DialTimeout}, "https://www.googleapis.com/auth/userinfo.email")
	if err != nil {
	sklog.Fatalf("Failed to create client for talking to the issue tracker: %s", err)
	}
	go monitorIssueTracker(client)

	liveness := metrics2.NewLiveness("probes")

	// TODO(jcgregorio) Monitor config file and reload if it changes.
	cfg, err := readConfigFiles(*config)
	if err != nil {
	sklog.Fatalln("Failed to read config file: ", err)
	}
	sklog.Infoln("Successfully read config file.")
	// Register counters for each probe.
	for name, probe := range cfg {
	for _, url := range probe.URLs {
	probe.failure[url] = metrics2.GetInt64Metric("prober", map[string]string{"type": "failure", "probename": name, "url": url})
	probe.latency[url] = metrics2.GetInt64Metric("prober", map[string]string{"type": "latency", "probename": name, "url": url})
	}
	}

	// Create a client that uses our dialer with a timeout.
	c := &http.Client{
	Transport: &http.Transport{
	Dial: dialTimeout,
	},
	Timeout: REQUEST_TIMEOUT,
	}
	probeOneRound(cfg, c)
	for _ = range time.Tick(*runEvery) {
	probeOneRound(cfg, c)
	liveness.Reset()
	}
	}