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logger.go
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logger.go
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package main
import (
"OPiControllerLogger/utils"
"database/sql"
"fmt"
_ "github.com/mattn/go-sqlite3"
"github.com/streadway/amqp"
"log"
"net/http"
"strconv"
"sync"
)
const rabbitMqConnection = "amqp://guest:guest@localhost:5672/"
var lock sync.Mutex
var rlock sync.RWMutex
func main() {
conn, err := amqp.Dial(rabbitMqConnection)
if err != nil {
log.Fatal("Failed to connect RabbitMQ")
}
channel, err := conn.Channel()
if err != nil {
log.Fatal("Failed to create channel RabbitMQ")
}
queue, err := channel.QueueDeclare(
"log",
true,
false,
false,
false,
nil,
)
messages, err := channel.Consume(
queue.Name,
"",
false,
false,
false,
false,
nil,
)
if err != nil {
log.Fatal("Failed to register a consumer")
}
db, err := sql.Open("sqlite3", "logbase.sqlite")
if err != nil {
log.Fatal("Can't open DB file! Error: ", err)
}
defer db.Close()
forever := make(chan bool)
go ConsumeMessages(messages, db)
go StartHttpServer(db)
<-forever
}
func StartHttpServer(db *sql.DB) {
http.HandleFunc("/", HTTPHandler(db))
err := http.ListenAndServe(":48700", nil)
if err != nil {
fmt.Println("http server error: ", err)
}
}
func ConsumeMessages(messages <-chan amqp.Delivery, db *sql.DB) {
lock.Lock()
defer lock.Unlock()
for msg := range messages {
_ = msg.Ack(false)
lm := utils.NewLogMessageFromRabbit(msg.Body)
_, err := db.Exec("Insert into log (datetime, sender, message) "+
"values ($1, $2, $3)", lm.Datetime, lm.Sender, lm.Message)
if err != nil {
log.Println("Error writing to DB: ", err)
}
}
}
func HTTPHandler(db *sql.DB) func(w http.ResponseWriter, req *http.Request) {
return func(w http.ResponseWriter, req *http.Request) {
w.Header().Add("Access-Control-Allow-Origin", "*")
w.Header().Add("Access-Control-Allow-Methods", "GET")
fmt.Println("requested: ", req.URL)
q := req.URL.Query()
num, err := strconv.Atoi(q.Get("num"))
if err != nil {
num = 100
}
page, err := strconv.Atoi(q.Get("page"))
if err != nil {
page = 0
}
_, err = w.Write(utils.ReturnNLogMessages(num, page, db, &rlock))
if err != nil {
log.Println("HTTPServer Error: ", err)
}
}
}