/
main.go
264 lines (245 loc) · 5.8 KB
/
main.go
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package main
import (
"bytes"
"database/sql"
"encoding/json"
"flag"
"fmt"
"log"
"os"
"os/exec"
"os/signal"
"path/filepath"
"strings"
"syscall"
"text/template"
"time"
"github.com/at-wat/mqtt-go"
"github.com/cespedes/smarthome"
_ "github.com/lib/pq"
)
type server struct {
verbose bool
config typeConfig
logFile *os.File
logFileName string
mqttClient *smarthome.MQTTClient
mqttChan chan *mqtt.Message
influx *smarthome.InfluxClient
db *sql.DB
}
func (s *server) mqttInit() error {
var err error
if s.verbose {
log.Println("Creating MQTT client...")
}
mqttAddr := fmt.Sprintf("mqtt://%s:%d", s.config.MQTT.Server, s.config.MQTT.Port)
s.mqttClient, err = smarthome.NewMQTTClient(mqttAddr)
if err != nil {
return err
}
if s.verbose {
log.Printf("Subscribing to \"#\"")
}
s.mqttChan = s.mqttClient.Subscribe("#")
return nil
}
func toFloat(v interface{}) string {
if i, ok := v.(int); ok {
return fmt.Sprintf("%d.0", i)
}
if f, ok := v.(float64); ok {
return fmt.Sprintf("%f", f)
}
return "0.0"
}
func tmpl(t string, v string) string {
value := parseValue(v)
var funcMap = template.FuncMap{
"now": time.Now,
"float": toFloat,
}
tmpl, err := template.New("").Funcs(funcMap).Parse(t)
if err != nil {
log.Printf("error parsing template %q: %s", t, err.Error())
return ""
}
var b bytes.Buffer
err = tmpl.Execute(&b, value)
if err != nil {
log.Printf("error executing template %q with value %v: %s", t, v, err.Error())
return ""
}
return b.String()
}
// parseValue tries to parse s as JSON and returns it.
// If it is not a valid JSON, it returns s.
func parseValue(s string) interface{} {
var parsed interface{}
err := json.Unmarshal([]byte(s), &parsed)
if err != nil {
return s
}
return parsed
}
func writeFile(filename, prefix, message string) {
os.MkdirAll(filepath.Dir(filename), 0777)
logFile, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0666)
if err != nil {
log.Fatal(err)
}
fmt.Fprintf(logFile, "%s %s\n", prefix, message)
logFile.Close()
}
func (s *server) writeLog(message string) {
filename := tmpl(s.config.Logs.Filename, "")
prefix := tmpl(s.config.Logs.Prefix, "")
if s.logFileName != filename {
var err error
s.logFile.Close()
os.MkdirAll(filepath.Dir(filename), 0777)
s.logFile, err = os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0666)
if err != nil {
log.Fatal(err)
}
s.logFileName = filename
}
fmt.Fprintf(s.logFile, "%s %s\n", prefix, message)
}
func (s *server) writeDebug(message string) {
filename := tmpl(s.config.Debug.Filename, "")
prefix := tmpl(s.config.Debug.Prefix, "")
writeFile(filename, prefix, message)
}
func (s *server) influxInit() error {
if s.verbose {
log.Println("Creating Influx client...")
}
var err error
s.influx, err = smarthome.NewInfluxClient(s.config.Influx.Addr, s.config.Influx.User, s.config.Influx.Pass, s.config.Influx.Database)
return err
}
func (s *server) postgresInit() error {
if s.verbose {
log.Println("Creating PostgreSQL client...")
}
var err error
s.db, err = sql.Open("postgres", s.config.Postgres.Connect)
if err != nil {
return fmt.Errorf("postgres connect: %v", err)
}
err = s.db.Ping()
if err != nil {
return fmt.Errorf("postgres ping: %v", err)
}
return nil
}
func (s *server) init() error {
if err := s.readConfig(); err != nil {
return err
}
if s.verbose {
log.Printf("CONFIG: %+v", s.config)
log.Printf("Log filename: %q", tmpl(s.config.Logs.Filename, ""))
log.Printf("Log prefix: %q", tmpl(s.config.Logs.Prefix, ""))
}
if err := s.mqttInit(); err != nil {
return err
}
if err := s.influxInit(); err != nil {
return err
}
if err := s.postgresInit(); err != nil {
return err
}
return nil
}
func main() {
var s server
flag.BoolVar(&s.verbose, "v", false, "be verbose")
flag.Parse()
if s.verbose {
log.Println("mqtt2all starting")
}
// SIGHUP handling:
signalChan := make(chan os.Signal, 1)
signal.Notify(signalChan, syscall.SIGHUP)
if err := s.init(); err != nil {
log.Fatal(err)
}
oldValues := make(map[string]string)
for {
select {
case m := <-s.mqttChan:
topic := m.Topic
value := string(m.Payload)
if _, ok := s.config.Topics[topic]; !ok {
continue
}
different := false
if old, ok := oldValues[topic]; ok && value != old {
different = true
}
list := []string{".", value}
if different {
list = append(list, "/=")
}
conf := s.config.Topics[topic]
for _, l := range list {
st, ok := conf[l]
if !ok {
continue
}
if value != oldValues[topic] && st.Log != "" { // do not log if repeat values
v := tmpl(st.Log, value)
s.writeLog(v)
if s.verbose {
log.Printf("LOG: %q", v)
}
}
if value != oldValues[topic] && st.Debug != "" { // do not log if repeat values
v := tmpl(st.Debug, value)
s.writeDebug(v)
if s.verbose {
log.Printf("DEBUG: %q", v)
}
}
if st.Influx != "" {
v := tmpl(st.Influx, value)
if s.verbose {
log.Printf("INFLUX: %q", v)
}
err := s.influx.InsertLine(v)
if err != nil {
log.Printf("Influx Insert Error: %s", err.Error())
}
}
if st.Postgres != "" {
v := tmpl(st.Postgres, value)
if s.verbose {
log.Printf("POSTGRES: %q", v)
}
_, err := s.db.Exec(v)
if err != nil {
log.Printf("PostgreSQL Exec Error: %v", err)
}
}
if value != oldValues[topic] && st.Exec != "" { // do not exec if repeat values
v := tmpl(st.Exec, value)
if s.verbose {
log.Printf("EXEC: %q", v)
}
arguments := strings.Split(v, " ")
cmd := exec.Command(arguments[0], arguments[1:]...)
cmd.Run()
}
}
oldValues[topic] = value
case <-signalChan:
log.Println("SIGHUP received")
if err := s.init(); err != nil {
log.Fatal(err)
}
}
}
}