breaking up exporter.go and exporter_test.go into smaller units (oliver006#474)

* breaking up exporter.go and exporter_test.go into smaller, more manageable units

* simplify key-value handling

Author: oliver006

contrib/sample-pwd-file.json-malformed

@@ -0,0 +1,4 @@
+{
+  "redis://redis6:6379": "",
+  "redis://pwd-redis5:6380": "redis-password"
+

exporter/clients.go

@@ -0,0 +1,71 @@
+package exporter
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/gomodule/redigo/redis"
+	"github.com/prometheus/client_golang/prometheus"
+	log "github.com/sirupsen/logrus"
+)
+
+/*
+	Valid Examples
+	id=11 addr=127.0.0.1:63508 fd=8 name= age=6321 idle=6320 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=setex
+	id=14 addr=127.0.0.1:64958 fd=9 name= age=5 idle=0 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=26 qbuf-free=32742 obl=0 oll=0 omem=0 events=r cmd=client
+*/
+func parseClientListString(clientInfo string) ([]string, bool) {
+	if matched, _ := regexp.MatchString(`^id=\d+ addr=\d+`, clientInfo); !matched {
+		return nil, false
+	}
+	connectedClient := map[string]string{}
+	for _, kvPart := range strings.Split(clientInfo, " ") {
+		vPart := strings.Split(kvPart, "=")
+		if len(vPart) != 2 {
+			log.Debugf("Invalid format for client list string, got: %s", kvPart)
+			return nil, false
+		}
+		connectedClient[vPart[0]] = vPart[1]
+	}
+
+	hostPortString := strings.Split(connectedClient["addr"], ":")
+	if len(hostPortString) != 2 {
+		return nil, false
+	}
+
+	return []string{
+		connectedClient["name"],
+		connectedClient["age"],
+		connectedClient["idle"],
+		connectedClient["flags"],
+		connectedClient["db"],
+		connectedClient["omem"],
+		connectedClient["cmd"],
+
+		hostPortString[0], // host
+		hostPortString[1], // port
+	}, true
+
+}
+
+func (e *Exporter) extractConnectedClientMetrics(ch chan<- prometheus.Metric, c redis.Conn) {
+	reply, err := redis.String(doRedisCmd(c, "CLIENT", "LIST"))
+	if err != nil {
+		log.Errorf("CLIENT LIST err: %s", err)
+		return
+	}
+
+	for _, c := range strings.Split(reply, "\n") {
+		if lbls, ok := parseClientListString(c); ok {
+
+			// port is the last item, we'll trim it if it's not needed
+			if !e.options.ExportClientsInclPort {
+				lbls = lbls[:len(lbls)-1]
+			}
+			e.registerConstMetricGauge(
+				ch, "connected_clients_details", 1.0,
+				lbls...,
+			)
+		}
+	}
+}

exporter/clients_test.go

@@ -0,0 +1,89 @@
+package exporter
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+func TestParseClientListString(t *testing.T) {
+	tsts := map[string][]string{
+		"id=11 addr=127.0.0.1:63508 fd=8 name= age=6321 idle=6320 flags=N db=0 sub=0 psub=0 multi=-1 qbuf=0 qbuf-free=0 obl=0 oll=0 omem=0 events=r cmd=setex":    []string{"", "6321", "6320", "N", "0", "0", "setex", "127.0.0.1", "63508"},
+		"id=14 addr=127.0.0.1:64958 fd=9 name=foo age=5 idle=0 flags=N db=1 sub=0 psub=0 multi=-1 qbuf=26 qbuf-free=32742 obl=0 oll=0 omem=0 events=r cmd=client": []string{"foo", "5", "0", "N", "1", "0", "client", "127.0.0.1", "64958"},
+	}
+
+	for k, v := range tsts {
+		lbls, ok := parseClientListString(k)
+		mismatch := false
+		for idx, l := range lbls {
+			if l != v[idx] {
+				mismatch = true
+				break
+			}
+		}
+		if !ok || mismatch {
+			t.Errorf("TestParseClientListString( %s ) error. Given: %s Wanted: %s", k, lbls, v)
+		}
+	}
+}
+
+func TestExportClientList(t *testing.T) {
+	for _, isExportClientList := range []bool{true, false} {
+		e := getTestExporterWithOptions(Options{
+			Namespace: "test", Registry: prometheus.NewRegistry(),
+			ExportClientList: isExportClientList,
+		})
+
+		chM := make(chan prometheus.Metric)
+		go func() {
+			e.Collect(chM)
+			close(chM)
+		}()
+
+		found := false
+		for m := range chM {
+			if strings.Contains(m.Desc().String(), "connected_clients_details") {
+				found = true
+			}
+		}
+
+		if isExportClientList && !found {
+			t.Errorf("connected_clients_details was *not* found in isExportClientList metrics but expected")
+		} else if !isExportClientList && found {
+			t.Errorf("connected_clients_details was *found* in isExportClientList metrics but *not* expected")
+		}
+	}
+}
+
+func TestExportClientListInclPort(t *testing.T) {
+	for _, inclPort := range []bool{true, false} {
+		e := getTestExporterWithOptions(Options{
+			Namespace: "test", Registry: prometheus.NewRegistry(),
+			ExportClientList:      true,
+			ExportClientsInclPort: inclPort,
+		})
+
+		chM := make(chan prometheus.Metric)
+		go func() {
+			e.Collect(chM)
+			close(chM)
+		}()
+
+		found := false
+		for m := range chM {
+			desc := m.Desc().String()
+			if strings.Contains(desc, "connected_clients_details") {
+				if strings.Contains(desc, "port") {
+					found = true
+				}
+			}
+		}
+
+		if inclPort && !found {
+			t.Errorf(`connected_clients_details did *not* include "port" in isExportClientList metrics but was expected`)
+		} else if !inclPort && found {
+			t.Errorf(`connected_clients_details did *include* "port" in isExportClientList metrics but was *not* expected`)
+		}
+	}
+}