A prometheus exporter for 3D printers exposing Prusa Connect's API.
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prusa-connect-exporter/main.go

366 lines
9.2 KiB

package main
import (
"context"
"encoding/json"
"flag"
"io"
"log"
"net/http"
"strconv"
"strings"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
// original /api/telemetry type struct
type MetricsV1 struct {
TempNozzle int `json:"temp_nozzle"`
TempBed int `json:"temp_bed"`
Material string `json:"material"`
ZPosition float64 `json:"pos_z_mm"`
PrintingSpeed int `json:"printing_speed"`
FlowFactor int `json:"flow_factor"`
Progress int `json:"progress"`
PrintDur string `json:"print_dur"`
TimeEst string `json:"time_est"`
TimeZone string `json:"time_zone"`
ProjectName string `json:"project_name"`
}
// new 4.4.0+ /api/printer struct
type MetricsV2 struct {
Telemetry Telemetry `json:"telemetry"`
Temperature Temperature `json:"temperature"`
State State `json:"state"`
}
type Telemetry struct {
TempBed float64 `json:"temp-bed"`
TempNozzle float64 `json:"temp-nozzle"`
PrintSpeed int `json:"print-speed"`
ZHeight float64 `json:"z-height"`
Material string `json:"material"`
}
type Temperature struct {
Tool0 Tempatures `json:"tool0"`
Bed Tempatures `json:"bed"`
}
type Tempatures struct {
Actual float64 `json:"actual"`
Target float64 `json:"target"`
Display float64 `json:"display"`
Offset float64 `json:"offset"`
}
type State struct {
Text string `json:"text"`
Flags Flags `json:"flags"`
}
type Flags struct {
Operational bool `json:"operational"`
Paused bool `json:"paused"`
Printing bool `json:"printing"`
Cancelling bool `json:"cancelling"`
Pausing bool `json:"pausing"`
SdReady bool `json:"sdReady"`
Error bool `json:"error"`
ClosedOnError bool `json:"closedOnError"`
Ready bool `json:"ready"`
Busy bool `json:"busy"`
}
// /api/job struct
type JobV2 struct {
State string `json:"state"`
Job Job `json:"job"`
Progress Progress `json:"progress"`
}
type File struct {
Name string `json:"name"`
Path string `json:"path"`
Display string `json:"display"`
}
type Job struct {
EstimatedPrintTime int `json:"estimatedPrintTime"`
File File `json:"file"`
}
type Progress struct {
Completion float64 `json:"completion"`
PrintTime int `json:"printTime"`
PrintTimeLeft int `json:"printTimeLeft"`
}
type Config struct {
QueryHostname string
QueryInterval int
Port string
Path string
APIKey string
}
var (
errCount = 0
gauges = map[string]prometheus.Gauge{
"flow_factor": prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "prusa_connect",
Name: "flow_factor",
Help: "Current flow factor, as a unitless number",
}),
"printing_speed": prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "prusa_connect",
Name: "printing_speed",
Help: "Current print speed, as a percentage",
}),
"z_position": prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "prusa_connect",
Name: "z_position",
Help: "Vertical depth, in mm, of the Z head",
}),
"temp_bed": prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "prusa_connect",
Name: "temp_bed",
Help: "Temperature, in celsius, of the print bed",
}),
"temp_nozzle": prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "prusa_connect",
Name: "temp_nozzle",
Help: "Temperature, in celsius, of the print nozzle",
}),
"progress": prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "prusa_connect",
Name: "progress",
Help: "Current print completeness, as a percentage",
}),
"duration": prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "prusa_connect",
Name: "duration",
Help: "Duration of current print job, as seconds since start",
}),
"remaining": prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: "prusa_connect",
Name: "remaining",
Help: "Estimated remaining time of current print job, as seconds",
}),
}
)
func errLog(err error) {
errCount++
// reset metrics
for _, g := range gauges {
g.Set(0)
}
if errCount == 5 {
log.Printf("suppressing further error logging")
return
} else if errCount > 5 {
return
}
log.Printf("error retrieving telemetry: %v", err)
}
func recordMetrics(ctx context.Context, config Config) {
go func() {
for {
select {
case <-ctx.Done():
log.Print("exiting!")
return
default:
time.Sleep(time.Second * time.Duration(config.QueryInterval))
if config.APIKey == "" {
parseMetricsV1(ctx, config)
break
}
parseMetricsV2(ctx, config)
}
}
}()
}
func parseMetricsV1(ctx context.Context, config Config) {
t, err := getTelemetry(config.QueryHostname)
if err != nil {
errLog(err)
return
}
if errCount != 0 {
errCount = 0
log.Printf("connection established")
}
gauges["flow_factor"].Set(float64(t.FlowFactor))
gauges["printing_speed"].Set(float64(t.PrintingSpeed))
gauges["z_position"].Set(t.ZPosition)
gauges["temp_bed"].Set(float64(t.TempBed))
gauges["temp_nozzle"].Set(float64(t.TempNozzle))
gauges["progress"].Set(float64(t.Progress))
gauges["duration"].Set(float64(parseDuration(t.PrintDur) / time.Second))
estimatedTimeRemaining, err := strconv.ParseFloat(t.TimeEst, 64)
if err == nil {
gauges["remaining"].Set(float64(estimatedTimeRemaining))
}
}
func parseMetricsV2(ctx context.Context, config Config) {
t, err := getPrinter(config.Port, config.APIKey)
if err != nil {
errLog(err)
return
}
j, err := getJob(config.Port, config.APIKey)
if err != nil {
errLog(err)
return
}
if errCount != 0 {
errCount = 0
log.Printf("connection established")
}
gauges["printing_speed"].Set(float64(t.Telemetry.PrintSpeed))
gauges["z_position"].Set(t.Telemetry.ZHeight)
gauges["temp_bed"].Set(float64(t.Telemetry.TempBed))
gauges["temp_nozzle"].Set(float64(t.Telemetry.TempNozzle))
gauges["progress"].Set(float64(j.Progress.Completion) * 100)
gauges["duration"].Set(float64(j.Progress.PrintTime))
gauges["remaining"].Set(float64(j.Progress.PrintTimeLeft))
}
func getJob(hostname, apiKey string) (*JobV2, error) {
r, err := http.NewRequest(http.MethodGet, hostname+"/api/job", nil)
if err != nil {
return &JobV2{}, err
}
r.Header.Set("X-Api-Key", apiKey)
res, err := http.DefaultClient.Do(r)
if err != nil {
return &JobV2{}, err
}
b, err := io.ReadAll(res.Body)
if err != nil {
return &JobV2{}, err
}
j := &JobV2{}
err = json.Unmarshal(b, j)
if err != nil {
return &JobV2{}, err
}
return j, nil
}
func getPrinter(hostname, apiKey string) (*MetricsV2, error) {
r, err := http.NewRequest(http.MethodGet, hostname+"/api/printer", nil)
if err != nil {
return &MetricsV2{}, err
}
r.Header.Set("X-Api-Key", apiKey)
res, err := http.DefaultClient.Do(r)
if err != nil {
return &MetricsV2{}, err
}
b, err := io.ReadAll(res.Body)
if err != nil {
return &MetricsV2{}, err
}
j := &MetricsV2{}
err = json.Unmarshal(b, j)
if err != nil {
return &MetricsV2{}, err
}
return j, nil
}
func getTelemetry(hostname string) (*MetricsV1, error) {
res, err := http.Get(hostname + "/api/telemetry")
if err != nil {
return &MetricsV1{}, err
}
b, err := io.ReadAll(res.Body)
if err != nil {
return &MetricsV1{}, err
}
t := &MetricsV1{}
err = json.Unmarshal(b, t)
if err != nil {
return &MetricsV1{}, err
}
return t, nil
}
// taking a guess on proper parsing here...
func parseDuration(d string) time.Duration {
dur := 0
d = strings.TrimSpace(d)
number := []rune{}
for _, t := range d {
switch t {
case ' ':
continue
case '1', '2', '3', '4', '5', '6', '7', '8', '9', '0':
number = append(number, t)
case 's':
i, _ := strconv.Atoi(string(number))
dur += i * int(time.Second)
number = []rune{}
case 'm':
i, _ := strconv.Atoi(string(number))
dur += (i * int(time.Minute))
number = []rune{}
case 'h':
i, _ := strconv.Atoi(string(number))
dur += (i * int(time.Hour))
number = []rune{}
case 'd':
i, _ := strconv.Atoi(string(number))
dur += (i * int(time.Hour) * 24)
number = []rune{}
}
}
return time.Duration(dur)
}
func main() {
var hostname string
flag.StringVar(&hostname, "hostname", "localhost", "Hostname the Prusa Connect API is available at (assumes http)")
var queryInterval int
flag.IntVar(&queryInterval, "interval", 2, "How often, in seconds, to query the API")
var port string
flag.StringVar(&port, "port", "2112", "Local port to export metrics on")
var path string
flag.StringVar(&path, "path", "metrics", "Local path to export metrics on")
var apiKey string
flag.StringVar(&apiKey, "apikey", "", "Prusa Connect API key (see Main Menu -> Settings -> Network on the printer)")
flag.Parse()
if queryInterval < 1 {
log.Fatalf("query interval must be greater than 0; %d received", queryInterval)
}
config := Config{
QueryHostname: "http://" + hostname,
QueryInterval: queryInterval,
Port: port,
Path: path,
APIKey: apiKey,
}
r := prometheus.NewRegistry()
for _, g := range gauges {
r.MustRegister(g)
}
recordMetrics(context.Background(), config)
log.Printf("starting exporter on :%v", config.Port)
http.Handle("/"+config.Path, promhttp.HandlerFor(r, promhttp.HandlerOpts{}))
http.ListenAndServe(":"+config.Port, nil)
}