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// Copyright 2013 The Prometheus Authors
// 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 web
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
stdlog "log"
"math"
"net"
"net/http"
"net/http/pprof"
"net/url"
"os"
"path"
"path/filepath"
"regexp"
"runtime"
"sort"
"strings"
"sync"
"sync/atomic"
template_text "text/template"
"time"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
conntrack "github.com/mwitkow/go-conntrack"
"github.com/opentracing-contrib/go-stdlib/nethttp"
opentracing "github.com/opentracing/opentracing-go"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
io_prometheus_client "github.com/prometheus/client_model/go"
"github.com/prometheus/common/model"
"github.com/prometheus/common/route"
"github.com/prometheus/common/server"
"github.com/prometheus/prometheus/tsdb"
"github.com/prometheus/prometheus/tsdb/index"
"github.com/soheilhy/cmux"
"golang.org/x/net/netutil"
"google.golang.org/grpc"
"github.com/prometheus/prometheus/config"
"github.com/prometheus/prometheus/notifier"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/rules"
"github.com/prometheus/prometheus/scrape"
"github.com/prometheus/prometheus/storage"
prometheus_tsdb "github.com/prometheus/prometheus/storage/tsdb"
"github.com/prometheus/prometheus/template"
"github.com/prometheus/prometheus/util/httputil"
api_v1 "github.com/prometheus/prometheus/web/api/v1"
api_v2 "github.com/prometheus/prometheus/web/api/v2"
"github.com/prometheus/prometheus/web/ui"
)
var (
localhostRepresentations = []string{"127.0.0.1", "localhost"}
// Paths that are handled by the React / Reach router that should all be served the main React app's index.html.
reactRouterPaths = []string{
"/",
"/alerts",
"/config",
"/flags",
"/graph",
"/rules",
"/service-discovery",
"/status",
"/targets",
"/version",
}
)
// withStackTrace logs the stack trace in case the request panics. The function
// will re-raise the error which will then be handled by the net/http package.
// It is needed because the go-kit log package doesn't manage properly the
// panics from net/http (see https://github.com/go-kit/kit/issues/233).
func withStackTracer(h http.Handler, l log.Logger) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
defer func() {
if err := recover(); err != nil {
const size = 64 << 10
buf := make([]byte, size)
buf = buf[:runtime.Stack(buf, false)]
level.Error(l).Log("msg", "panic while serving request", "client", r.RemoteAddr, "url", r.URL, "err", err, "stack", buf)
panic(err)
}
}()
h.ServeHTTP(w, r)
})
}
type metrics struct {
requestCounter *prometheus.CounterVec
requestDuration *prometheus.HistogramVec
responseSize *prometheus.HistogramVec
}
func newMetrics(r prometheus.Registerer) *metrics {
m := &metrics{
requestCounter: prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: "prometheus_http_requests_total",
Help: "Counter of HTTP requests.",
},
[]string{"handler", "code"},
),
requestDuration: prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "prometheus_http_request_duration_seconds",
Help: "Histogram of latencies for HTTP requests.",
Buckets: []float64{.1, .2, .4, 1, 3, 8, 20, 60, 120},
},
[]string{"handler"},
),
responseSize: prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: "prometheus_http_response_size_bytes",
Help: "Histogram of response size for HTTP requests.",
Buckets: prometheus.ExponentialBuckets(100, 10, 8),
},
[]string{"handler"},
),
}
if r != nil {
r.MustRegister(m.requestCounter, m.requestDuration, m.responseSize)
}
return m
}
func (m *metrics) instrumentHandlerWithPrefix(prefix string) func(handlerName string, handler http.HandlerFunc) http.HandlerFunc {
return func(handlerName string, handler http.HandlerFunc) http.HandlerFunc {
return m.instrumentHandler(prefix+handlerName, handler)
}
}
func (m *metrics) instrumentHandler(handlerName string, handler http.HandlerFunc) http.HandlerFunc {
return promhttp.InstrumentHandlerCounter(
m.requestCounter.MustCurryWith(prometheus.Labels{"handler": handlerName}),
promhttp.InstrumentHandlerDuration(
m.requestDuration.MustCurryWith(prometheus.Labels{"handler": handlerName}),
promhttp.InstrumentHandlerResponseSize(
m.responseSize.MustCurryWith(prometheus.Labels{"handler": handlerName}),
handler,
),
),
)
}
// PrometheusVersion contains build information about Prometheus.
type PrometheusVersion = api_v1.PrometheusVersion
// Handler serves various HTTP endpoints of the Prometheus server
type Handler struct {
logger log.Logger
gatherer prometheus.Gatherer
metrics *metrics
scrapeManager *scrape.Manager
ruleManager *rules.Manager
queryEngine *promql.Engine
context context.Context
tsdb func() *tsdb.DB
storage storage.Storage
notifier *notifier.Manager
apiV1 *api_v1.API
router *route.Router
quitCh chan struct{}
reloadCh chan chan error
options *Options
config *config.Config
versionInfo *PrometheusVersion
birth time.Time
cwd string
flagsMap map[string]string
mtx sync.RWMutex
now func() model.Time
ready uint32 // ready is uint32 rather than boolean to be able to use atomic functions.
}
// ApplyConfig updates the config field of the Handler struct
func (h *Handler) ApplyConfig(conf *config.Config) error {
h.mtx.Lock()
defer h.mtx.Unlock()
h.config = conf
return nil
}
// Options for the web Handler.
type Options struct {
Context context.Context
TSDB func() *tsdb.DB
TSDBCfg prometheus_tsdb.Options
Storage storage.Storage
QueryEngine *promql.Engine
ScrapeManager *scrape.Manager
RuleManager *rules.Manager
Notifier *notifier.Manager
Version *PrometheusVersion
Flags map[string]string
ListenAddress string
CORSOrigin *regexp.Regexp
ReadTimeout time.Duration
MaxConnections int
ExternalURL *url.URL
RoutePrefix string
UseLocalAssets bool
UserAssetsPath string
ConsoleTemplatesPath string
ConsoleLibrariesPath string
EnableLifecycle bool
EnableAdminAPI bool
PageTitle string
RemoteReadSampleLimit int
RemoteReadConcurrencyLimit int
RemoteReadBytesInFrame int
Gatherer prometheus.Gatherer
Registerer prometheus.Registerer
}
// New initializes a new web Handler.
func New(logger log.Logger, o *Options) *Handler {
if logger == nil {
logger = log.NewNopLogger()
}
m := newMetrics(o.Registerer)
router := route.New().WithInstrumentation(m.instrumentHandler)
cwd, err := os.Getwd()
if err != nil {
cwd = "<error retrieving current working directory>"
}
h := &Handler{
logger: logger,
gatherer: o.Gatherer,
metrics: m,
router: router,
quitCh: make(chan struct{}),
reloadCh: make(chan chan error),
options: o,
versionInfo: o.Version,
birth: time.Now(),
cwd: cwd,
flagsMap: o.Flags,
context: o.Context,
scrapeManager: o.ScrapeManager,
ruleManager: o.RuleManager,
queryEngine: o.QueryEngine,
tsdb: o.TSDB,
storage: o.Storage,
notifier: o.Notifier,
now: model.Now,
ready: 0,
}
h.apiV1 = api_v1.NewAPI(h.queryEngine, h.storage, h.scrapeManager, h.notifier,
func() config.Config {
h.mtx.RLock()
defer h.mtx.RUnlock()
return *h.config
},
o.Flags,
h.testReady,
func() api_v1.TSDBAdmin {
return h.options.TSDB()
},
h.options.EnableAdminAPI,
logger,
h.ruleManager,
h.options.RemoteReadSampleLimit,
h.options.RemoteReadConcurrencyLimit,
h.options.RemoteReadBytesInFrame,
h.options.CORSOrigin,
h.runtimeInfo,
h.versionInfo,
)
if o.RoutePrefix != "/" {
// If the prefix is missing for the root path, prepend it.
router.Get("/", func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, o.RoutePrefix, http.StatusFound)
})
router = router.WithPrefix(o.RoutePrefix)
}
readyf := h.testReady
router.Get("/", func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, path.Join(o.ExternalURL.Path, "/graph"), http.StatusFound)
})
router.Get("/alerts", readyf(h.alerts))
router.Get("/graph", readyf(h.graph))
router.Get("/status", readyf(h.status))
router.Get("/flags", readyf(h.flags))
router.Get("/config", readyf(h.serveConfig))
router.Get("/rules", readyf(h.rules))
router.Get("/targets", readyf(h.targets))
router.Get("/version", readyf(h.version))
router.Get("/service-discovery", readyf(h.serviceDiscovery))
router.Get("/metrics", promhttp.Handler().ServeHTTP)
router.Get("/federate", readyf(httputil.CompressionHandler{
Handler: http.HandlerFunc(h.federation),
}.ServeHTTP))
router.Get("/consoles/*filepath", readyf(h.consoles))
router.Get("/static/*filepath", func(w http.ResponseWriter, r *http.Request) {
r.URL.Path = path.Join("/static", route.Param(r.Context(), "filepath"))
fs := server.StaticFileServer(ui.Assets)
fs.ServeHTTP(w, r)
})
// Make sure that "<path-prefix>/new" is redirected to "<path-prefix>/new/" and
// not just the naked "/new/", which would be the default behavior of the router
// with the "RedirectTrailingSlash" option (https://godoc.org/github.com/julienschmidt/httprouter#Router.RedirectTrailingSlash),
// and which breaks users with a --web.route-prefix that deviates from the path derived
// from the external URL.
router.Get("/new", func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, path.Join(o.ExternalURL.Path, "new")+"/", http.StatusFound)
})
router.Get("/new/*filepath", func(w http.ResponseWriter, r *http.Request) {
p := route.Param(r.Context(), "filepath")
// For paths that the React/Reach router handles, we want to serve the
// index.html, but with replaced path prefix placeholder.
for _, rp := range reactRouterPaths {
if p != rp {
continue
}
f, err := ui.Assets.Open("/static/react/index.html")
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "Error opening React index.html: %v", err)
return
}
idx, err := ioutil.ReadAll(f)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "Error reading React index.html: %v", err)
return
}
prefixedIdx := bytes.ReplaceAll(idx, []byte("PATH_PREFIX_PLACEHOLDER"), []byte(o.ExternalURL.Path))
w.Write(prefixedIdx)
return
}
// For all other paths, serve auxiliary assets.
r.URL.Path = path.Join("/static/react/", p)
fs := server.StaticFileServer(ui.Assets)
fs.ServeHTTP(w, r)
})
if o.UserAssetsPath != "" {
router.Get("/user/*filepath", route.FileServe(o.UserAssetsPath))
}
if o.EnableLifecycle {
router.Post("/-/quit", h.quit)
router.Put("/-/quit", h.quit)
router.Post("/-/reload", h.reload)
router.Put("/-/reload", h.reload)
} else {
forbiddenAPINotEnabled := func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusForbidden)
w.Write([]byte("Lifecycle API is not enabled."))
}
router.Post("/-/quit", forbiddenAPINotEnabled)
router.Put("/-/quit", forbiddenAPINotEnabled)
router.Post("/-/reload", forbiddenAPINotEnabled)
router.Put("/-/reload", forbiddenAPINotEnabled)
}
router.Get("/-/quit", func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusMethodNotAllowed)
w.Write([]byte("Only POST or PUT requests allowed"))
})
router.Get("/-/reload", func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusMethodNotAllowed)
w.Write([]byte("Only POST or PUT requests allowed"))
})
router.Get("/debug/*subpath", serveDebug)
router.Post("/debug/*subpath", serveDebug)
router.Get("/-/healthy", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, "Prometheus is Healthy.\n")
})
router.Get("/-/ready", readyf(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, "Prometheus is Ready.\n")
}))
return h
}
func serveDebug(w http.ResponseWriter, req *http.Request) {
ctx := req.Context()
subpath := route.Param(ctx, "subpath")
if subpath == "/pprof" {
http.Redirect(w, req, req.URL.Path+"/", http.StatusMovedPermanently)
return
}
if !strings.HasPrefix(subpath, "/pprof/") {
http.NotFound(w, req)
return
}
subpath = strings.TrimPrefix(subpath, "/pprof/")
switch subpath {
case "cmdline":
pprof.Cmdline(w, req)
case "profile":
pprof.Profile(w, req)
case "symbol":
pprof.Symbol(w, req)
case "trace":
pprof.Trace(w, req)
default:
req.URL.Path = "/debug/pprof/" + subpath
pprof.Index(w, req)
}
}
// Ready sets Handler to be ready.
func (h *Handler) Ready() {
atomic.StoreUint32(&h.ready, 1)
}
// Verifies whether the server is ready or not.
func (h *Handler) isReady() bool {
ready := atomic.LoadUint32(&h.ready)
return ready > 0
}
// Checks if server is ready, calls f if it is, returns 503 if it is not.
func (h *Handler) testReady(f http.HandlerFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if h.isReady() {
f(w, r)
} else {
w.WriteHeader(http.StatusServiceUnavailable)
fmt.Fprintf(w, "Service Unavailable")
}
}
}
// Checks if server is ready, calls f if it is, returns 503 if it is not.
func (h *Handler) testReadyHandler(f http.Handler) http.HandlerFunc {
return h.testReady(f.ServeHTTP)
}
// Quit returns the receive-only quit channel.
func (h *Handler) Quit() <-chan struct{} {
return h.quitCh
}
// Reload returns the receive-only channel that signals configuration reload requests.
func (h *Handler) Reload() <-chan chan error {
return h.reloadCh
}
// Run serves the HTTP endpoints.
func (h *Handler) Run(ctx context.Context) error {
level.Info(h.logger).Log("msg", "Start listening for connections", "address", h.options.ListenAddress)
listener, err := net.Listen("tcp", h.options.ListenAddress)
if err != nil {
return err
}
listener = netutil.LimitListener(listener, h.options.MaxConnections)
// Monitor incoming connections with conntrack.
listener = conntrack.NewListener(listener,
conntrack.TrackWithName("http"),
conntrack.TrackWithTracing())
var (
m = cmux.New(listener)
// See https://github.com/grpc/grpc-go/issues/2636 for why we need to use MatchWithWriters().
grpcl = m.MatchWithWriters(cmux.HTTP2MatchHeaderFieldSendSettings("content-type", "application/grpc"))
httpl = m.Match(cmux.HTTP1Fast())
grpcSrv = grpc.NewServer()
)
av2 := api_v2.New(
h.options.TSDB,
h.options.EnableAdminAPI,
)
av2.RegisterGRPC(grpcSrv)
hh, err := av2.HTTPHandler(ctx, h.options.ListenAddress)
if err != nil {
return err
}
hhFunc := h.testReadyHandler(hh)
operationName := nethttp.OperationNameFunc(func(r *http.Request) string {
return fmt.Sprintf("%s %s", r.Method, r.URL.Path)
})
mux := http.NewServeMux()
mux.Handle("/", h.router)
av1 := route.New().WithInstrumentation(h.metrics.instrumentHandlerWithPrefix("/api/v1"))
h.apiV1.Register(av1)
apiPath := "/api"
if h.options.RoutePrefix != "/" {
apiPath = h.options.RoutePrefix + apiPath
level.Info(h.logger).Log("msg", "router prefix", "prefix", h.options.RoutePrefix)
}
mux.Handle(apiPath+"/v1/", http.StripPrefix(apiPath+"/v1", av1))
mux.Handle(apiPath+"/", http.StripPrefix(apiPath,
http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
httputil.SetCORS(w, h.options.CORSOrigin, r)
hhFunc(w, r)
}),
))
errlog := stdlog.New(log.NewStdlibAdapter(level.Error(h.logger)), "", 0)
httpSrv := &http.Server{
Handler: withStackTracer(nethttp.Middleware(opentracing.GlobalTracer(), mux, operationName), h.logger),
ErrorLog: errlog,
ReadTimeout: h.options.ReadTimeout,
}
errCh := make(chan error)
go func() {
errCh <- httpSrv.Serve(httpl)
}()
go func() {
errCh <- grpcSrv.Serve(grpcl)
}()
go func() {
errCh <- m.Serve()
}()
select {
case e := <-errCh:
return e
case <-ctx.Done():
httpSrv.Shutdown(ctx)
grpcSrv.GracefulStop()
return nil
}
}
func (h *Handler) alerts(w http.ResponseWriter, r *http.Request) {
var groups []*rules.Group
for _, group := range h.ruleManager.RuleGroups() {
if group.HasAlertingRules() {
groups = append(groups, group)
}
}
alertStatus := AlertStatus{
Groups: groups,
AlertStateToRowClass: map[rules.AlertState]string{
rules.StateInactive: "success",
rules.StatePending: "warning",
rules.StateFiring: "danger",
},
Counts: alertCounts(groups),
}
h.executeTemplate(w, "alerts.html", alertStatus)
}
func alertCounts(groups []*rules.Group) AlertByStateCount {
result := AlertByStateCount{}
for _, group := range groups {
for _, alert := range group.AlertingRules() {
switch alert.State() {
case rules.StateInactive:
result.Inactive++
case rules.StatePending:
result.Pending++
case rules.StateFiring:
result.Firing++
}
}
}
return result
}
func (h *Handler) consoles(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
name := route.Param(ctx, "filepath")
file, err := http.Dir(h.options.ConsoleTemplatesPath).Open(name)
if err != nil {
http.Error(w, err.Error(), http.StatusNotFound)
return
}
defer file.Close()
text, err := ioutil.ReadAll(file)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// Provide URL parameters as a map for easy use. Advanced users may have need for
// parameters beyond the first, so provide RawParams.
rawParams, err := url.ParseQuery(r.URL.RawQuery)
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
params := map[string]string{}
for k, v := range rawParams {
params[k] = v[0]
}
externalLabels := map[string]string{}
h.mtx.RLock()
els := h.config.GlobalConfig.ExternalLabels
h.mtx.RUnlock()
for _, el := range els {
externalLabels[el.Name] = el.Value
}
// Inject some convenience variables that are easier to remember for users
// who are not used to Go's templating system.
defs := []string{
"{{$rawParams := .RawParams }}",
"{{$params := .Params}}",
"{{$path := .Path}}",
"{{$externalLabels := .ExternalLabels}}",
}
data := struct {
RawParams url.Values
Params map[string]string
Path string
ExternalLabels map[string]string
}{
RawParams: rawParams,
Params: params,
Path: strings.TrimLeft(name, "/"),
ExternalLabels: externalLabels,
}
tmpl := template.NewTemplateExpander(
h.context,
strings.Join(append(defs, string(text)), ""),
"__console_"+name,
data,
h.now(),
template.QueryFunc(rules.EngineQueryFunc(h.queryEngine, h.storage)),
h.options.ExternalURL,
)
filenames, err := filepath.Glob(h.options.ConsoleLibrariesPath + "/*.lib")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
result, err := tmpl.ExpandHTML(filenames)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
io.WriteString(w, result)
}
func (h *Handler) graph(w http.ResponseWriter, r *http.Request) {
h.executeTemplate(w, "graph.html", nil)
}
func (h *Handler) status(w http.ResponseWriter, r *http.Request) {
status := struct {
Birth time.Time
CWD string
Version *PrometheusVersion
Alertmanagers []*url.URL
GoroutineCount int
GOMAXPROCS int
GOGC string
GODEBUG string
CorruptionCount int64
ChunkCount int64
TimeSeriesCount int64
LastConfigTime time.Time
ReloadConfigSuccess bool
StorageRetention string
NumSeries uint64
MaxTime int64
MinTime int64
Stats *index.PostingsStats
Duration string
}{
Birth: h.birth,
CWD: h.cwd,
Version: h.versionInfo,
Alertmanagers: h.notifier.Alertmanagers(),
GoroutineCount: runtime.NumGoroutine(),
GOMAXPROCS: runtime.GOMAXPROCS(0),
GOGC: os.Getenv("GOGC"),
GODEBUG: os.Getenv("GODEBUG"),
}
if h.options.TSDBCfg.RetentionDuration != 0 {
status.StorageRetention = h.options.TSDBCfg.RetentionDuration.String()
}
if h.options.TSDBCfg.MaxBytes != 0 {
if status.StorageRetention != "" {
status.StorageRetention = status.StorageRetention + " or "
}
status.StorageRetention = status.StorageRetention + h.options.TSDBCfg.MaxBytes.String()
}
metrics, err := h.gatherer.Gather()
if err != nil {
http.Error(w, fmt.Sprintf("error gathering runtime status: %s", err), http.StatusInternalServerError)
return
}
for _, mF := range metrics {
switch *mF.Name {
case "prometheus_tsdb_head_chunks":
status.ChunkCount = int64(toFloat64(mF))
case "prometheus_tsdb_head_series":
status.TimeSeriesCount = int64(toFloat64(mF))
case "prometheus_tsdb_wal_corruptions_total":
status.CorruptionCount = int64(toFloat64(mF))
case "prometheus_config_last_reload_successful":
status.ReloadConfigSuccess = toFloat64(mF) != 0
case "prometheus_config_last_reload_success_timestamp_seconds":
status.LastConfigTime = time.Unix(int64(toFloat64(mF)), 0)
}
}
db := h.tsdb()
startTime := time.Now().UnixNano()
status.Stats = db.Head().PostingsCardinalityStats("__name__")
status.Duration = fmt.Sprintf("%.3f", float64(time.Now().UnixNano()-startTime)/float64(1e9))
status.NumSeries = db.Head().NumSeries()
status.MaxTime = db.Head().MaxTime()
status.MinTime = db.Head().MaxTime()
h.executeTemplate(w, "status.html", status)
}
func (h *Handler) runtimeInfo() (api_v1.RuntimeInfo, error) {
status := api_v1.RuntimeInfo{
StartTime: h.birth,
CWD: h.cwd,
GoroutineCount: runtime.NumGoroutine(),
GOMAXPROCS: runtime.GOMAXPROCS(0),
GOGC: os.Getenv("GOGC"),
GODEBUG: os.Getenv("GODEBUG"),
}
if h.options.TSDBCfg.RetentionDuration != 0 {
status.StorageRetention = h.options.TSDBCfg.RetentionDuration.String()
}
if h.options.TSDBCfg.MaxBytes != 0 {
if status.StorageRetention != "" {
status.StorageRetention = status.StorageRetention + " or "
}
status.StorageRetention = status.StorageRetention + h.options.TSDBCfg.MaxBytes.String()
}
metrics, err := h.gatherer.Gather()
if err != nil {
return status, errors.Errorf("error gathering runtime status: %s", err)
}
for _, mF := range metrics {
switch *mF.Name {
case "prometheus_tsdb_head_chunks":
status.ChunkCount = int64(toFloat64(mF))
case "prometheus_tsdb_head_series":
status.TimeSeriesCount = int64(toFloat64(mF))
case "prometheus_tsdb_wal_corruptions_total":
status.CorruptionCount = int64(toFloat64(mF))
case "prometheus_config_last_reload_successful":
status.ReloadConfigSuccess = toFloat64(mF) != 0
case "prometheus_config_last_reload_success_timestamp_seconds":
status.LastConfigTime = time.Unix(int64(toFloat64(mF)), 0)
}
}
return status, nil
}
func toFloat64(f *io_prometheus_client.MetricFamily) float64 {
m := *f.Metric[0]
if m.Gauge != nil {
return m.Gauge.GetValue()
}
if m.Counter != nil {
return m.Counter.GetValue()
}
if m.Untyped != nil {
return m.Untyped.GetValue()
}
return math.NaN()
}
func (h *Handler) flags(w http.ResponseWriter, r *http.Request) {
h.executeTemplate(w, "flags.html", h.flagsMap)
}
func (h *Handler) serveConfig(w http.ResponseWriter, r *http.Request) {
h.mtx.RLock()
defer h.mtx.RUnlock()
h.executeTemplate(w, "config.html", h.config.String())
}
func (h *Handler) rules(w http.ResponseWriter, r *http.Request) {
h.executeTemplate(w, "rules.html", h.ruleManager)
}
func (h *Handler) serviceDiscovery(w http.ResponseWriter, r *http.Request) {
var index []string
targets := h.scrapeManager.TargetsAll()
for job := range targets {
index = append(index, job)
}
sort.Strings(index)
scrapeConfigData := struct {
Index []string
Targets map[string][]*scrape.Target
Active []int
Dropped []int
Total []int
}{
Index: index,
Targets: make(map[string][]*scrape.Target),
Active: make([]int, len(index)),
Dropped: make([]int, len(index)),
Total: make([]int, len(index)),
}
for i, job := range scrapeConfigData.Index {
scrapeConfigData.Targets[job] = make([]*scrape.Target, 0, len(targets[job]))
scrapeConfigData.Total[i] = len(targets[job])
for _, target := range targets[job] {
// Do not display more than 100 dropped targets per job to avoid
// returning too much data to the clients.
if target.Labels().Len() == 0 {
scrapeConfigData.Dropped[i]++
if scrapeConfigData.Dropped[i] > 100 {
continue
}
} else {
scrapeConfigData.Active[i]++
}
scrapeConfigData.Targets[job] = append(scrapeConfigData.Targets[job], target)
}
}
h.executeTemplate(w, "service-discovery.html", scrapeConfigData)
}
func (h *Handler) targets(w http.ResponseWriter, r *http.Request) {
tps := h.scrapeManager.TargetsActive()
for _, targets := range tps {
sort.Slice(targets, func(i, j int) bool {
iJobLabel := targets[i].Labels().Get(model.JobLabel)
jJobLabel := targets[j].Labels().Get(model.JobLabel)
if iJobLabel == jJobLabel {
return targets[i].Labels().Get(model.InstanceLabel) < targets[j].Labels().Get(model.InstanceLabel)
}
return iJobLabel < jJobLabel
})
}
h.executeTemplate(w, "targets.html", struct {
TargetPools map[string][]*scrape.Target
}{
TargetPools: tps,
})
}
func (h *Handler) version(w http.ResponseWriter, r *http.Request) {
dec := json.NewEncoder(w)
if err := dec.Encode(h.versionInfo); err != nil {
http.Error(w, fmt.Sprintf("error encoding JSON: %s", err), http.StatusInternalServerError)
}
}
func (h *Handler) quit(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Requesting termination... Goodbye!")
close(h.quitCh)
}
func (h *Handler) reload(w http.ResponseWriter, r *http.Request) {
rc := make(chan error)
h.reloadCh <- rc
if err := <-rc; err != nil {
http.Error(w, fmt.Sprintf("failed to reload config: %s", err), http.StatusInternalServerError)
}
}
func (h *Handler) consolesPath() string {
if _, err := os.Stat(h.options.ConsoleTemplatesPath + "/index.html"); !os.IsNotExist(err) {
return h.options.ExternalURL.Path + "/consoles/index.html"
}
if h.options.UserAssetsPath != "" {
if _, err := os.Stat(h.options.UserAssetsPath + "/index.html"); !os.IsNotExist(err) {
return h.options.ExternalURL.Path + "/user/index.html"
}
}
return ""
}
func tmplFuncs(consolesPath string, opts *Options) template_text.FuncMap {
return template_text.FuncMap{
"since": func(t time.Time) time.Duration {
return time.Since(t) / time.Millisecond * time.Millisecond
},
"consolesPath": func() string { return consolesPath },
"pathPrefix": func() string { return opts.ExternalURL.Path },
"pageTitle": func() string { return opts.PageTitle },
"buildVersion": func() string { return opts.Version.Revision },
"globalURL": func(u *url.URL) *url.URL {
host, port, err := net.SplitHostPort(u.Host)
if err != nil {
return u
}
for _, lhr := range localhostRepresentations {
if host == lhr {
_, ownPort, err := net.SplitHostPort(opts.ListenAddress)
if err != nil {
return u
}
if port == ownPort {
// Only in the case where the target is on localhost and its port is
// the same as the one we're listening on, we know for sure that
// we're monitoring our own process and that we need to change the
// scheme, hostname, and port to the externally reachable ones as
// well. We shouldn't need to touch the path at all, since if a
// path prefix is defined, the path under which we scrape ourselves
// should already contain the prefix.
u.Scheme = opts.ExternalURL.Scheme
u.Host = opts.ExternalURL.Host
} else {
// Otherwise, we only know that localhost is not reachable
// externally, so we replace only the hostname by the one in the
// external URL. It could be the wrong hostname for the service on
// this port, but it's still the best possible guess.
host, _, err := net.SplitHostPort(opts.ExternalURL.Host)
if err != nil {
return u
}
u.Host = host + ":" + port
}
break
}
}
return u
},
"numHealthy": func(pool []*scrape.Target) int {
alive := len(pool)
for _, p := range pool {
if p.Health() != scrape.HealthGood {
alive--
}
}
return alive
},
"targetHealthToClass": func(th scrape.TargetHealth) string {
switch th {
case scrape.HealthUnknown:
return "warning"
case scrape.HealthGood:
return "success"
default:
return "danger"
}
},
"ruleHealthToClass": func(rh rules.RuleHealth) string {
switch rh {
case rules.HealthUnknown:
return "warning"
case rules.HealthGood:
return "success"
default:
return "danger"
}
},
"alertStateToClass": func(as rules.AlertState) string {
switch as {
case rules.StateInactive:
return "success"
case rules.StatePending:
return "warning"
case rules.StateFiring:
return "danger"
default:
panic("unknown alert state")
}
},
}
}
func (h *Handler) getTemplate(name string) (string, error) {
var tmpl string
appendf := func(name string) error {
f, err := ui.Assets.Open(path.Join("/templates", name))
if err != nil {
return err
}
defer f.Close()
b, err := ioutil.ReadAll(f)
if err != nil {
return err
}
tmpl += string(b)
return nil
}
err := appendf("_base.html")
if err != nil {
return "", errors.Wrap(err, "error reading base template")
}
err = appendf(name)
if err != nil {
return "", errors.Wrapf(err, "error reading page template %s", name)
}
return tmpl, nil
}
func (h *Handler) executeTemplate(w http.ResponseWriter, name string, data interface{}) {
text, err := h.getTemplate(name)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
tmpl := template.NewTemplateExpander(
h.context,
text,
name,
data,
h.now(),
template.QueryFunc(rules.EngineQueryFunc(h.queryEngine, h.storage)),
h.options.ExternalURL,
)
tmpl.Funcs(tmplFuncs(h.consolesPath(), h.options))
result, err := tmpl.ExpandHTML(nil)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
io.WriteString(w, result)
}
// AlertStatus bundles alerting rules and the mapping of alert states to row classes.
type AlertStatus struct {
Groups []*rules.Group
AlertStateToRowClass map[rules.AlertState]string
Counts AlertByStateCount
}
type AlertByStateCount struct {
Inactive int32
Pending int32
Firing int32
}
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