Added prometheus exporter support

.dockerignore

@@ -0,0 +1,8 @@
+Dockerfile*
+.git/**
+dist/**
+.goreleaser.yml
+.circleci
+examples/**
+docs/**
+README*

.goreleaser.yml

@@ -24,6 +24,7 @@ dockers:
   - image_templates:
       - itzg/mc-monitor:latest
       - itzg/mc-monitor:{{ .Tag }}
+    dockerfile: Dockerfile.release
 checksum:
   name_template: 'checksums.txt'
 snapshot:

Dockerfile

@@ -1,3 +1,13 @@
+FROM golang:1.14 as builder
+
+WORKDIR /build
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 go build -o mc-monitor
+
 FROM scratch
-COPY mc-monitor /
-ENTRYPOINT ["/mc-monitor"]
+ENTRYPOINT ["/mc-monitor"]
+COPY --from=builder /build/mc-monitor /mc-monitor

Dockerfile.release

@@ -0,0 +1,3 @@
+FROM scratch
+COPY mc-monitor /
+ENTRYPOINT ["/mc-monitor"]

README.md

@@ -20,6 +20,7 @@ Subcommands:
 	version          Show version and exit
 
 Subcommands for monitoring:
+	export-for-prometheus  Registers an HTTP metrics endpoints for Prometheus export
 	gather-for-telegraf  Periodically gathers to status of one or more Minecraft servers and sends metrics to telegraf over TCP using Influx line protocol
 
 Subcommands for status:
@@ -45,7 +46,7 @@ docker run -it --rm itzg/mc-monitor status-bedrock --host play.fallentech.io
 
 where exit code will be 0 for success or 1 for failure.
 
-### Monitoring a server
+### Monitoring a server with Telegraf
 
 > The following example is provided in [examples/mc-monitor-telegraf](examples/mc-monitor-telegraf)
 
@@ -84,4 +85,22 @@ The output of the telegraf service will show metric entries such as:
 minecraft_status,host=mc.hypixel.net,port=25565,status=success response_time=0.172809649,online=51201i,max=90000i 1576971568953660767
 minecraft_status,host=mc.hypixel.net,port=25565,status=success response_time=0.239236074,online=51198i,max=90000i 1576971579020125479
 minecraft_status,host=mc.hypixel.net,port=25565,status=success response_time=0.225942383,online=51198i,max=90000i 1576971589006821324
-```
+```
+
+### Monitoring a server with Prometheus
+
+When using the `export-for-prometheus` subcommand, mc-monitor will serve a Prometheus exporter that collects the Minecraft server metrics during each scrape of the path `/metrics`.
+
+Labels
+- `server_host`
+- `server_port`
+- `server_edition` : `java` or `bedrock`
+Metrics
+- `minecraft_status_healthy`
+- `minecraft_status_response_time_seconds`
+- `minecraft_status_players_online_count`
+- `minecraft_status_players_max_count`
+
+An example Docker composition is provided in [examples/mc-monitor-prom](examples/mc-monitor-prom), which was used to grab the following screenshot:
+
+![Prometheus Chart](docs/prometheus_online_count_chart.png)

constants.go

@@ -1,6 +1,9 @@
 package main
 
-const DefaultPort int = 25565
+const (
+	DefaultJavaPort    uint16 = 25565
+	DefaultBedrockPort uint16 = 19132
+)
 
 const (
 	MetricName = "minecraft_status"
@@ -17,3 +20,18 @@ const (
 	StatusError   = "error"
 	StatusSuccess = "success"
 )
+
+type ServerEdition string
+
+const (
+	JavaEdition    ServerEdition = "java"
+	BedrockEdition ServerEdition = "bedrock"
+)
+
+func ValidEdition(v string) bool {
+	switch ServerEdition(v) {
+	case JavaEdition, BedrockEdition:
+		return true
+	}
+	return false
+}

examples/mc-monitor-prom/docker-compose.yml

@@ -0,0 +1,18 @@
+version: '3'
+
+services:
+  prom:
+    image: prom/prometheus
+    ports:
+    - 9090:9090
+    volumes:
+    - ./prometheus.yml:/etc/prometheus/prometheus.yml
+    depends_on:
+      - monitor
+  monitor:
+    build:
+      context: ../..
+    command: export-for-prometheus
+    environment:
+      EXPORT_SERVERS: 127.0.0.1,mc.hypixel.net,play.cubecraft.net
+      DEBUG: "true"

examples/mc-monitor-prom/prometheus.yml

@@ -0,0 +1,7 @@
+global:
+  scrape_interval: 30s
+scrape_configs:
+  - job_name: mc-monitor
+    static_configs:
+      - targets:
+          - monitor:8080

examples/mc-monitor-telegraf/docker-compose.yml

@@ -8,7 +8,8 @@ services:
     volumes:
     - ./telegraf.conf:/etc/telegraf/telegraf.conf:ro
   monitor:
-    image: itzg/mc-monitor
+    build:
+      context: ../..
     command: gather-for-telegraf
     environment:
       GATHER_INTERVAL: 10s

gather_telegraf.go

@@ -10,8 +10,6 @@ import (
 	"go.uber.org/zap"
 	"log"
 	"os"
-	"strconv"
-	"strings"
 	"time"
 )
 
@@ -34,9 +32,9 @@ func (c *gatherTelegrafCmd) Usage() string {
 	return ""
 }
 
-func (c *gatherTelegrafCmd) SetFlags(flags *flag.FlagSet) {
+func (c *gatherTelegrafCmd) SetFlags(f *flag.FlagSet) {
 	filler := flagsfiller.New(flagsfiller.WithEnv("Gather"))
-	err := filler.Fill(flags, c)
+	err := filler.Fill(f, c)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -97,17 +95,11 @@ func (c *gatherTelegrafCmd) createGatherers() ([]*TelegrafGatherer, error) {
 	}
 
 	for _, addr := range c.Servers {
-		parts := strings.SplitN(addr, ":", 2)
-		if len(parts) == 2 {
-			port, err := strconv.Atoi(parts[1])
-			if err != nil {
-				log.Printf("WARN: unable to process %s: %s\n", addr, err)
-			} else {
-				gatherers = append(gatherers, NewTelegrafGatherer(parts[0], port, lpClient, c.logger))
-			}
-		} else {
-			gatherers = append(gatherers, NewTelegrafGatherer(parts[0], DefaultPort, lpClient, c.logger))
+		host, port, err := SplitHostPort(addr, DefaultJavaPort)
+		if err != nil {
+			return nil, err
 		}
+		gatherers = append(gatherers, NewTelegrafGatherer(host, port, lpClient, c.logger))
 	}
 
 	return gatherers, nil

go.mod

@@ -3,12 +3,13 @@ module github.com/itzg/mc-monitor
 go 1.13
 
 require (
-	github.com/Raqbit/mc-pinger v0.0.0-20190414124050-6c3fd84faaa1
+	github.com/Raqbit/mc-pinger v0.0.0-20191220212142-2843d3222bd5
 	github.com/google/subcommands v1.0.1
 	github.com/itzg/go-flagsfiller v1.4.1
 	github.com/itzg/line-protocol-sender v0.1.1
 	github.com/itzg/zapconfigs v0.1.0
 	github.com/mitchellh/mapstructure v1.1.2 // indirect
+	github.com/prometheus/client_golang v1.5.1
 	github.com/sandertv/go-raknet v1.6.6
 	github.com/sandertv/gophertunnel v1.3.16
 	go.uber.org/zap v1.13.0

go.sum

@@ -2,6 +2,18 @@ github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ
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@@ -61,20 +118,31 @@ go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee h1:0mgffUl7nfd+FpvXMVz4IDEa
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@@ -85,13 +153,18 @@ golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtn
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