Added prom metrics + changed sensor values to 2 decimal places

.gitignore

@@ -20,3 +20,4 @@
 # Go workspace file
 go.work
 cmd/terrarium-bot/test.yaml
+cmd/terrarium-bot/terrarium-bot

README.md

@@ -3,8 +3,6 @@
 [![Latest release](https://img.shields.io/github/v/release/alec-pinson/terrarium-bot?label=Latest%20release)](https://github.com/alec-pinson/terrarium-bot/releases/latest)
 [![GitHub Release Date](https://img.shields.io/github/release-date/alec-pinson/terrarium-bot)](https://github.com/alec-pinson/terrarium-bot/releases/latest)  
 
-**CURRENTLY IN TESTING**  - I have been running this for a week or so now and I am still fixing minor issues.  
-
 Manage a Terrarium. Temperature, humidity, heating, misting, lighting, all fully configurable and customisable via YAML.  
 
 I currently run this in a Kubernetes cluster (3 Raspberry Pis using [K3S](https://k3s.io/)). I run it along side my other apps:
@@ -244,5 +242,25 @@ Example response:-
 }
 ```
 
+## Prometheus Metrics
+Prometheus metrics can be accessed via `:8081/metrics` and currently includes standard go metrics and the following custom metrics:-
+```
+# HELP terrarium_bot_http_client_pools_total The total number of http client pools
+# TYPE terrarium_bot_http_client_pools_total counter
+terrarium_bot_http_client_pools_total 3
+# HELP terrarium_bot_http_requests_received_total The total number of http requests received by terrarium bot
+# TYPE terrarium_bot_http_requests_received_total counter
+terrarium_bot_http_requests_received_total 2
+# HELP terrarium_bot_http_requests_sent_total The total number of http requests sent from terrarium bot
+# TYPE terrarium_bot_http_requests_sent_total counter
+terrarium_bot_http_requests_sent_total 33
+# HELP terrarium_bot_sensor_humidity The current value of the humidity sensor
+# TYPE terrarium_bot_sensor_humidity gauge
+terrarium_bot_sensor_humidity 65
+# HELP terrarium_bot_sensor_temperature The current value of the temperature sensor
+# TYPE terrarium_bot_sensor_temperature gauge
+terrarium_bot_sensor_temperature 27
+```
+
 ## The End
 Hopefully the configuration should be pretty self explanitory, if you get stuck or there are any features you think might be missing then feel free to create an issue :slightly_smiling_face:.

cmd/terrarium-bot/apiserver.go

@@ -6,10 +6,18 @@ import (
 	"net/http"
 	"strings"
 	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
 )
 
 type APIServer struct{}
 
+var metricHttpRequestsReceived = promauto.NewCounter(prometheus.CounterOpts{
+	Name: "terrarium_bot_http_requests_received_total",
+	Help: "The total number of http requests received by terrarium bot",
+})
+
 func (apiServer APIServer) Start() {
 	log.Println("Starting API server...")
 	http.HandleFunc("/", apiServer.Endpoint)
@@ -19,6 +27,7 @@ func (apiServer APIServer) Start() {
 }
 
 func (apiServer APIServer) Endpoint(w http.ResponseWriter, r *http.Request) {
+	metricHttpRequestsReceived.Inc()
 	switch path := r.URL.Path[1:]; {
 	case path == "health/live" || path == "health/ready":
 		fmt.Fprintf(w, "ok")

cmd/terrarium-bot/config.go

@@ -62,7 +62,7 @@ type Sensor struct {
 	Insecure bool   `yaml:"insecure"`
 	JsonPath string `yaml:"jsonPath"`
 	Unit     string `yaml:"unit"`
-	Value    int
+	Value    float64
 }
 
 type Notification struct {
@@ -90,13 +90,13 @@ type Alert struct {
 
 type When struct {
 	Day struct {
-		Below int           `yaml:"below"`
-		Above int           `yaml:"above"`
+		Below float64       `yaml:"below"`
+		Above float64       `yaml:"above"`
 		Every time.Duration `yaml:"every"`
 	} `yaml:"day"`
 	Night struct {
-		Below int           `yaml:"below"`
-		Above int           `yaml:"above"`
+		Below float64       `yaml:"below"`
+		Above float64       `yaml:"above"`
 		Every time.Duration `yaml:"every"`
 	} `yaml:"night"`
 }

cmd/terrarium-bot/config_test.go

@@ -129,8 +129,8 @@ alert:
 	assert.Equal(t, "trigger1", loadedConfig.Trigger[0].Id)
 	assert.Equal(t, "sensor1", loadedConfig.Trigger[0].Sensor)
 	assert.Equal(t, "http://localhost:8080", loadedConfig.Trigger[0].Endpoint)
-	assert.Equal(t, 5, loadedConfig.Trigger[0].When.Day.Below)
-	assert.Equal(t, 5, loadedConfig.Trigger[0].When.Night.Below)
+	assert.Equal(t, float64(5), loadedConfig.Trigger[0].When.Day.Below)
+	assert.Equal(t, float64(5), loadedConfig.Trigger[0].When.Night.Below)
 	assert.Equal(t, []string{"doSomething"}, loadedConfig.Trigger[0].Action)
 	assert.Equal(t, []string{"doSomethingElse"}, loadedConfig.Trigger[0].Else)
 
@@ -162,8 +162,8 @@ alert:
 	assert.Len(t, loadedConfig.Alert, 1)
 	assert.Equal(t, "alert1", loadedConfig.Alert[0].Id)
 	assert.Equal(t, "sensor1", loadedConfig.Alert[0].Sensor)
-	assert.Equal(t, 10, loadedConfig.Alert[0].When.Day.Below)
-	assert.Equal(t, 5, loadedConfig.Alert[0].When.Night.Below)
+	assert.Equal(t, float64(10), loadedConfig.Alert[0].When.Day.Below)
+	assert.Equal(t, float64(5), loadedConfig.Alert[0].When.Night.Below)
 	assert.Equal(t, 20*time.Minute, loadedConfig.Alert[0].After)
 	assert.Equal(t, []string{"notification1"}, loadedConfig.Alert[0].Notification)
 

cmd/terrarium-bot/http.go

@@ -14,9 +14,22 @@ import (
 	"net/url"
 	"strings"
 	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
 )
 
-var httpClientPool []*HttpClientPool
+var (
+	httpClientPool       []*HttpClientPool
+	metricHttpClientPool = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "terrarium_bot_http_client_pools_total",
+		Help: "The total number of http client pools",
+	})
+	metricHttpRequestsSent = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "terrarium_bot_http_requests_sent_total",
+		Help: "The total number of http requests sent from terrarium bot",
+	})
+)
 
 type HttpClientPool struct {
 	Hostname string
@@ -45,6 +58,7 @@ func getClient(address string, insecure bool) *http.Client {
 		Hostname: hostname,
 		Client:   client,
 	})
+	metricHttpClientPool.Inc()
 	return &client
 }
 
@@ -71,6 +85,7 @@ func SendRequest(url string, insecure bool, retries int, decodeJson bool) (map[s
 	// retry x times if an error occurs, sleep 1 second each time
 	for i := 0; i < retries; i++ {
 		Debug("Request attempt %v/%v", i+1, retries)
+		metricHttpRequestsSent.Inc()
 		resp, err = client.Do(req)
 		if err == nil && resp.StatusCode == 200 {
 			break

cmd/terrarium-bot/http_test.go

@@ -77,3 +77,63 @@ func TestSendRequest(t *testing.T) {
 		log.SetOutput(os.Stderr)
 	})
 }
+
+func TestSendRequestConnectionPooling(t *testing.T) {
+	isTesting = true
+	config.Debug = true
+	httpClientPool = nil
+	var buf bytes.Buffer
+	log.SetOutput(&buf)
+
+	// Mock http request response
+	mockResponse := `{"key1": "value1", "key2": 2, "key3": ["element1", "element2"]}`
+	mux := http.NewServeMux()
+	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprint(w, mockResponse)
+	})
+	server := httptest.NewServer(mux)
+	defer server.Close()
+
+	// first request should create a new http pool
+	SendRequest(server.URL, false, 1, true)
+	if got := buf.String(); !strings.Contains(got, "Creating http pool") {
+		t.Errorf("Expected new connection to be created: %q", got)
+	}
+
+	buf.Reset()
+	SendRequest(server.URL, false, 1, true)
+	if got := buf.String(); !strings.Contains(got, "conn was reused: true") {
+		t.Errorf("Expected connection to be reused: %q", got)
+	}
+
+	buf.Reset()
+	SendRequest(server.URL, false, 1, true)
+	if got := buf.String(); !strings.Contains(got, "conn was reused: true") {
+		t.Errorf("Expected connection to be reused: %q", got)
+	}
+
+	buf.Reset()
+	SendRequest(server.URL+"/123", false, 1, true)
+	if got := buf.String(); !strings.Contains(got, "conn was reused: true") {
+		t.Errorf("Expected connection to be reused: %q", got)
+	}
+
+	buf.Reset()
+	SendRequest(server.URL+"/abcdef", false, 1, true)
+	if got := buf.String(); !strings.Contains(got, "conn was reused: true") {
+		t.Errorf("Expected connection to be reused: %q", got)
+	}
+
+	buf.Reset()
+	SendRequest(server.URL, false, 1, true)
+	if got := buf.String(); !strings.Contains(got, "conn was reused: true") {
+		t.Errorf("Expected connection to be reused: %q", got)
+	}
+
+	// reset
+	isTesting = false
+	config.Debug = false
+	log.SetOutput(os.Stderr)
+}

cmd/terrarium-bot/main.go

@@ -7,6 +7,7 @@ import (
 var (
 	config    Config
 	apiServer APIServer
+	metrics   Metrics
 	isTesting bool = false // flag used when testing
 )
 
@@ -33,6 +34,7 @@ func main() {
 	InitTime()
 	InitAlerting()
 	apiServer.Start()
+	metrics.Start()
 	InitTriggers()
 	InitNotifications()
 

cmd/terrarium-bot/metrics.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+type Metrics struct{}
+
+func (metrics Metrics) Start() {
+	log.Println("Starting Metrics server...")
+	http.Handle("/metrics", promhttp.Handler())
+	go http.ListenAndServe(":8081", nil)
+	time.Sleep(1 * time.Second) // give some time for metrics server to start before moving on
+	log.Println("Metrics Server started...")
+}

cmd/terrarium-bot/sensor.go

@@ -4,9 +4,13 @@ import (
 	"encoding/json"
 	"fmt"
 	"log"
+	"math"
 	"strconv"
 	"strings"
 	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
 )
 
 func GetSensor(id string) *Sensor {
@@ -26,15 +30,15 @@ func InitSensors() {
 	time.Sleep(5 * time.Second) // give abit of time for any sensors to collect data
 }
 
-func (s *Sensor) SetValue(value int) {
+func (s *Sensor) SetValue(value float64) {
 	s.Value = value
 }
 
-func (s *Sensor) GetValue() int {
+func (s *Sensor) GetValue() float64 {
 	return s.Value
 }
 
-func (s *Sensor) getSensorValue() int {
+func (s *Sensor) getSensorValue() float64 {
 	r, respCode, err := SendRequest(s.Url, s.Insecure, 3, s.JsonPath != "")
 	if err != nil {
 		log.Println(err)
@@ -50,10 +54,15 @@ func (s *Sensor) getSensorValue() int {
 		return 0
 	}
 	value := getJsonValue(string(b), s.JsonPath)
-	intValue, err := strconv.Atoi(fmt.Sprintf("%.0f", value))
-	s.SetValue(intValue)
+	floatVal, err := strconv.ParseFloat(fmt.Sprint(value), 64)
+	if err != nil {
+		log.Println(err)
+		return 0
+	}
+	roundedValue := math.Round(floatVal*100) / 100
+	s.SetValue(roundedValue)
 	s.checkValue()
-	return intValue
+	return roundedValue
 }
 
 func (s *Sensor) checkValue() {
@@ -66,10 +75,16 @@ func (s *Sensor) checkValue() {
 }
 
 func (s *Sensor) monitor() {
+	var sensorMetrics = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "terrarium_bot_sensor_" + s.Id,
+		Help: "The current value of the " + s.Id + " sensor",
+	})
+
 	val := s.getSensorValue()
 	log.Printf("Monitoring sensor '%s' (%v%s)", s.Id, val, s.Unit)
 	for {
 		val = s.getSensorValue()
+		sensorMetrics.Set(float64(val))
 		Debug("%s: %v%s", strings.Title(s.Id), val, s.Unit)
 		time.Sleep(1 * time.Minute)
 	}

cmd/terrarium-bot/sensor_test.go

@@ -21,14 +21,14 @@ func TestSensorSetValue(t *testing.T) {
 	s := &Sensor{}
 	s.SetValue(42)
 	if s.Value != 42 {
-		t.Errorf("Expected sensor value to be 42, but got %d", s.Value)
+		t.Errorf("Expected sensor value to be 42, but got %v", s.Value)
 	}
 }
 
 func TestSensorGetValue(t *testing.T) {
 	s := &Sensor{Value: 42}
 	v := s.GetValue()
 	if v != 42 {
-		t.Errorf("Expected sensor value to be 42, but got %d", v)
+		t.Errorf("Expected sensor value to be 42, but got %v", v)
 	}
 }

cmd/terrarium-bot/trigger.go

@@ -1,8 +1,8 @@
 package main
 
 import (
+	"fmt"
 	"log"
-	"strconv"
 	"time"
 )
 
@@ -23,16 +23,16 @@ func InitTriggers() {
 	}
 }
 
-func GenerateReason(value int, unit string, maxValue int) string {
-	return strconv.Itoa(value) + unit + "/" + strconv.Itoa(maxValue) + unit
+func GenerateReason(value float64, unit string, maxValue float64) string {
+	return fmt.Sprintf("%.2f", value) + unit + "/" + fmt.Sprintf("%.2f", maxValue) + unit
 }
 
 func (t *Trigger) monitor() {
 	var (
 		s         *Sensor
 		runAction bool
 		reason    string
-		value     int
+		value     float64
 	)
 
 	// get trigger sensor if one is set

go.mod

@@ -8,11 +8,23 @@ require github.com/thedevsaddam/gojsonq v2.3.0+incompatible
 
 require (
 	github.com/gregdel/pushover v1.1.0
+	github.com/prometheus/client_golang v1.15.1
 	github.com/stretchr/testify v1.8.2
 )
 
 require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_model v0.3.0 // indirect
+	github.com/prometheus/common v0.42.0 // indirect
+	github.com/prometheus/procfs v0.9.0 // indirect
+	github.com/rogpeppe/go-internal v1.10.0 // indirect
+	golang.org/x/sys v0.6.0 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )