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main.go
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package main
import (
"fmt"
"io"
"log"
"net/http"
"os"
"time"
"github.com/jpramirez/go-qplace-api/pkg/models"
)
var (
MaxWorker = os.Getenv("MAX_WORKERS")
MaxQueue = os.Getenv("MAX_QUEUE")
)
// Job represents the job to be run
type Job struct {
Payload models.Payload
}
// A buffered channel that we can send work requests on.
var JobQueue chan Job
// Worker represents the worker that executes the job
type Worker struct {
WorkerPool chan chan Job
JobChannel chan Job
quit chan bool
}
func NewWorker(workerPool chan chan Job) Worker {
return Worker{
WorkerPool: workerPool,
JobChannel: make(chan Job),
quit: make(chan bool)}
}
// Start method starts the run loop for the worker, listening for a quit channel in
// case we need to stop it
func (w Worker) Start() {
go func() {
for {
// register the current worker into the worker queue.
w.WorkerPool <- w.JobChannel
select {
case job := <-w.JobChannel:
// we have received a work request.
if err := job.Payload.SavePayLoad; err != nil {
log.Println("Error uploading to S3: %s", err)
}
case <-w.quit:
// we have received a signal to stop
return
}
}
}()
}
type Dispatcher struct {
// A pool of workers channels that are registered with the dispatcher
WorkerPool chan chan Job
maxWorkers int
pool int
}
func NewDispatcher(maxWorkers int) *Dispatcher {
pool := make(chan chan Job, maxWorkers)
return &Dispatcher{WorkerPool: pool}
}
func (d *Dispatcher) Run() {
// starting n number of workers
for i := 0; i < d.maxWorkers; i++ {
worker := NewWorker(d.WorkerPool)
worker.Start()
}
go d.dispatch()
}
func (d *Dispatcher) dispatch() {
for {
select {
case job := <-JobQueue:
// a job request has been received
go func(job Job) {
// try to obtain a worker job channel that is available.
// this will block until a worker is idle
jobChannel := <-d.WorkerPool
// dispatch the job to the worker job channel
jobChannel <- job
}(job)
}
}
}
/*
func PayloadHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
// Read the body into a string for json decoding
var content = &PayloadCollection{}
err := json.NewDecoder(io.LimitReader(r.Body, MaxLength)).Decode(&content)
if err != nil {
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
w.WriteHeader(http.StatusBadRequest)
return
}
// Go through each payload and queue items individually to be posted to S3
for _, payload := range content.Payloads {
// let's create a job with the payload
work := Job{Payload: payload}
// Push the work onto the queue.
JobQueue <- work
}
w.WriteHeader(http.StatusOK)
}
*/
func renderError(w http.ResponseWriter, message string, statusCode int) {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte(message))
}
//GetFileContentType will get the mime type of the file by reading its first 512 bytes (according to the standard)
func GetFileContentType(buffer []byte) (string, error) {
// Use the net/http package's handy DectectContentType function. Always returns a valid
// content-type by returning "application/octet-stream" if no others seemed to match.
contentType := http.DetectContentType(buffer)
return contentType, nil
}
//UploadHandler is in charge of optimizing upload request
func UploadHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
w.WriteHeader(http.StatusMethodNotAllowed)
return
}
config := models.ServerConfig{
MaxUploadSize: 2 * 1024 * 1024,
UploadFolder: "./upload/",
}
reader, err := r.MultipartReader()
fmt.Println(err)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
for {
part, err := reader.NextPart()
if err == io.EOF {
break
}
//if part.FileName() is empty, skip this iteration.
if part.FileName() == "" {
continue
}
dst, err := os.Create(config.UploadFolder + part.FileName())
defer dst.Close()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
buffer := make([]byte, 512)
part.Read(buffer)
content, err := GetFileContentType(buffer)
if content != "image/jpeg" {
fmt.Println("format not supported ")
continue
}
/*
fmt.Println("Saving File")
if _, err := io.Copy(dst, part); err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
*/
var read int64
var p float32
length := r.ContentLength
ticker := time.Tick(time.Millisecond) // <-- use this in production
//ticker := time.Tick(time.Second) // this is for demo purpose with longer delay
for {
buffer := make([]byte, 100000)
cBytes, err := part.Read(buffer)
if err == io.EOF {
fmt.Printf("\nLast buffer read!")
break
}
read = read + int64(cBytes)
//fmt.Printf("\r read: %v length : %v \n", read, length)
if read > 0 {
p = float32(read*100) / float32(length)
//fmt.Printf("progress: %v \n", p)
<-ticker
fmt.Printf("\rUploading progress %v", p) // for console
dst.Write(buffer[0:cBytes])
} else {
break
}
}
}
}
func main() {
http.HandleFunc("/uploadAudio", UploadHandler)
//static file handler.
http.Handle("/assets/", http.StripPrefix("/assets/", http.FileServer(http.Dir("assets"))))
//Listen on port 8080
http.ListenAndServe(":8080", nil)
}