Add stats to httpd package

CHANGELOG.md

@@ -12,6 +12,7 @@ With this release InfluxDB is moving to Go 1.5.
 - [#3975](https://github.com/influxdb/influxdb/pull/3975): Add shard copy service
 - [#3986](https://github.com/influxdb/influxdb/pull/3986): Support sorting by time desc
 - [#3930](https://github.com/influxdb/influxdb/pull/3930): Wire up TOP aggregate function - fixes [#1821](https://github.com/influxdb/influxdb/issues/1821)
+- [#3996](https://github.com/influxdb/influxdb/pull/3996): Add statistics to httpd package
 
 ### Bugfixes
 - [#3804](https://github.com/influxdb/influxdb/pull/3804): init.d script fixes, fixes issue 3803.

services/httpd/handler.go

@@ -74,16 +74,18 @@ type Handler struct {
 	Logger         *log.Logger
 	loggingEnabled bool // Log every HTTP access.
 	WriteTrace     bool // Detailed logging of write path
+	statMap        *expvar.Map
 }
 
 // NewHandler returns a new instance of handler with routes.
-func NewHandler(requireAuthentication, loggingEnabled, writeTrace bool) *Handler {
+func NewHandler(requireAuthentication, loggingEnabled, writeTrace bool, statMap *expvar.Map) *Handler {
 	h := &Handler{
 		mux: pat.New(),
 		requireAuthentication: requireAuthentication,
 		Logger:                log.New(os.Stderr, "[http] ", log.LstdFlags),
 		loggingEnabled:        loggingEnabled,
 		WriteTrace:            writeTrace,
+		statMap:               statMap,
 	}
 
 	h.SetRoutes([]route{
@@ -150,6 +152,8 @@ func (h *Handler) SetRoutes(routes []route) {
 
 // ServeHTTP responds to HTTP request to the handler.
 func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	h.statMap.Add(statRequest, 1)
+
 	// FIXME(benbjohnson): Add pprof enabled flag.
 	if strings.HasPrefix(r.URL.Path, "/debug/pprof") {
 		switch r.URL.Path {
@@ -170,6 +174,8 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *Handler) serveProcessContinuousQueries(w http.ResponseWriter, r *http.Request, user *meta.UserInfo) {
+	h.statMap.Add(statCQRequest, 1)
+
 	// If the continuous query service isn't configured, return 404.
 	if h.ContinuousQuerier == nil {
 		w.WriteHeader(http.StatusNotImplemented)
@@ -210,6 +216,8 @@ func (h *Handler) serveProcessContinuousQueries(w http.ResponseWriter, r *http.R
 
 // serveQuery parses an incoming query and, if valid, executes the query.
 func (h *Handler) serveQuery(w http.ResponseWriter, r *http.Request, user *meta.UserInfo) {
+	h.statMap.Add(statQueryRequest, 1)
+
 	q := r.URL.Query()
 	pretty := q.Get("pretty") == "true"
 
@@ -288,9 +296,10 @@ func (h *Handler) serveQuery(w http.ResponseWriter, r *http.Request, user *meta.
 
 		// Write out result immediately if chunked.
 		if chunked {
-			w.Write(MarshalJSON(Response{
+			n, _ := w.Write(MarshalJSON(Response{
 				Results: []*influxql.Result{r},
 			}, pretty))
+			h.statMap.Add(statQueryRequestBytesTransmitted, int64(n))
 			w.(http.Flusher).Flush()
 			continue
 		}
@@ -327,11 +336,13 @@ func (h *Handler) serveQuery(w http.ResponseWriter, r *http.Request, user *meta.
 
 	// If it's not chunked we buffered everything in memory, so write it out
 	if !chunked {
-		w.Write(MarshalJSON(resp, pretty))
+		n, _ := w.Write(MarshalJSON(resp, pretty))
+		h.statMap.Add(statQueryRequestBytesTransmitted, int64(n))
 	}
 }
 
 func (h *Handler) serveWrite(w http.ResponseWriter, r *http.Request, user *meta.UserInfo) {
+	h.statMap.Add(statWriteRequest, 1)
 
 	// Handle gzip decoding of the body
 	body := r.Body
@@ -353,6 +364,7 @@ func (h *Handler) serveWrite(w http.ResponseWriter, r *http.Request, user *meta.
 		h.writeError(w, influxql.Result{Err: err}, http.StatusBadRequest)
 		return
 	}
+	h.statMap.Add(statWriteRequestBytesReceived, int64(len(b)))
 	if h.WriteTrace {
 		h.Logger.Printf("write body received by handler: %s", string(b))
 	}
@@ -415,13 +427,16 @@ func (h *Handler) serveWriteJSON(w http.ResponseWriter, r *http.Request, body []
 		RetentionPolicy:  bp.RetentionPolicy,
 		ConsistencyLevel: cluster.ConsistencyLevelOne,
 		Points:           points,
-	}); influxdb.IsClientError(err) {
-		resultError(w, influxql.Result{Err: err}, http.StatusBadRequest)
-		return
-	} else if err != nil {
-		resultError(w, influxql.Result{Err: err}, http.StatusInternalServerError)
+	}); err != nil {
+		h.statMap.Add(statPointsWrittenFail, int64(len(points)))
+		if influxdb.IsClientError(err) {
+			h.writeError(w, influxql.Result{Err: err}, http.StatusBadRequest)
+		} else {
+			h.writeError(w, influxql.Result{Err: err}, http.StatusInternalServerError)
+		}
 		return
 	}
+	h.statMap.Add(statPointsWrittenOK, int64(len(points)))
 
 	w.WriteHeader(http.StatusNoContent)
 }
@@ -512,13 +527,16 @@ func (h *Handler) serveWriteLine(w http.ResponseWriter, r *http.Request, body []
 		ConsistencyLevel: consistency,
 		Points:           points,
 	}); influxdb.IsClientError(err) {
+		h.statMap.Add(statPointsWrittenFail, int64(len(points)))
 		h.writeError(w, influxql.Result{Err: err}, http.StatusBadRequest)
 		return
 	} else if err != nil {
+		h.statMap.Add(statPointsWrittenFail, int64(len(points)))
 		h.writeError(w, influxql.Result{Err: err}, http.StatusInternalServerError)
 		return
 	}
 
+	h.statMap.Add(statPointsWrittenOK, int64(len(points)))
 	w.WriteHeader(http.StatusNoContent)
 }
 
@@ -529,6 +547,7 @@ func (h *Handler) serveOptions(w http.ResponseWriter, r *http.Request) {
 
 // servePing returns a simple response to let the client know the server is running.
 func (h *Handler) servePing(w http.ResponseWriter, r *http.Request) {
+	h.statMap.Add(statPingRequest, 1)
 	w.WriteHeader(http.StatusNoContent)
 }
 
@@ -667,16 +686,19 @@ func authenticate(inner func(http.ResponseWriter, *http.Request, *meta.UserInfo)
 		if requireAuthentication && len(uis) > 0 {
 			username, password, err := parseCredentials(r)
 			if err != nil {
+				h.statMap.Add(statAuthFail, 1)
 				httpError(w, err.Error(), false, http.StatusUnauthorized)
 				return
 			}
 			if username == "" {
+				h.statMap.Add(statAuthFail, 1)
 				httpError(w, "username required", false, http.StatusUnauthorized)
 				return
 			}
 
 			user, err = h.MetaStore.Authenticate(username, password)
 			if err != nil {
+				h.statMap.Add(statAuthFail, 1)
 				httpError(w, err.Error(), false, http.StatusUnauthorized)
 				return
 			}

services/httpd/handler_test.go

@@ -12,6 +12,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/influxdb/influxdb"
 	"github.com/influxdb/influxdb/client"
 	"github.com/influxdb/influxdb/influxql"
 	"github.com/influxdb/influxdb/meta"
@@ -365,8 +366,9 @@ type Handler struct {
 
 // NewHandler returns a new instance of Handler.
 func NewHandler(requireAuthentication bool) *Handler {
+	statMap := influxdb.NewStatistics("httpd", "httpd", nil)
 	h := &Handler{
-		Handler: httpd.NewHandler(requireAuthentication, true, false),
+		Handler: httpd.NewHandler(requireAuthentication, true, false, statMap),
 	}
 	h.Handler.MetaStore = &h.MetaStore
 	h.Handler.QueryExecutor = &h.QueryExecutor

services/httpd/service.go

@@ -2,12 +2,29 @@ package httpd
 
 import (
 	"crypto/tls"
+	"expvar"
 	"fmt"
 	"log"
 	"net"
 	"net/http"
 	"os"
 	"strings"
+
+	"github.com/influxdb/influxdb"
+)
+
+// statistics gathered by the httpd package.
+const (
+	statRequest                      = "req"                 // Number of HTTP requests served
+	statCQRequest                    = "cq_req"              // Number of CQ-execute requests served
+	statQueryRequest                 = "query_req"           // Number of query requests served
+	statWriteRequest                 = "write_req"           // Number of write requests serverd
+	statPingRequest                  = "ping_req"            // Number of ping requests served
+	statWriteRequestBytesReceived    = "write_req_bytes"     // Sum of all bytes in write requests
+	statQueryRequestBytesTransmitted = "query_resp_bytes"    // Sum of all bytes returned in query reponses
+	statPointsWrittenOK              = "points_written_ok"   // Number of points written OK
+	statPointsWrittenFail            = "points_written_fail" // Number of points that failed to be written
+	statAuthFail                     = "auth_fail"           // Number of authentication failures
 )
 
 // Service manages the listener and handler for an HTTP endpoint.
@@ -20,11 +37,18 @@ type Service struct {
 
 	Handler *Handler
 
-	Logger *log.Logger
+	Logger  *log.Logger
+	statMap *expvar.Map
 }
 
 // NewService returns a new instance of Service.
 func NewService(c Config) *Service {
+	// Configure expvar monitoring. It's OK to do this even if the service fails to open and
+	// should be done before any data could arrive for the service.
+	key := strings.Join([]string{"httpd", c.BindAddress}, ":")
+	tags := map[string]string{"bind": c.BindAddress}
+	statMap := influxdb.NewStatistics(key, "httpd", tags)
+
 	s := &Service{
 		addr:  c.BindAddress,
 		https: c.HttpsEnabled,
@@ -34,6 +58,7 @@ func NewService(c Config) *Service {
 			c.AuthEnabled,
 			c.LogEnabled,
 			c.WriteTracing,
+			statMap,
 		),
 		Logger: log.New(os.Stderr, "[httpd] ", log.LstdFlags),
 	}