Golang : Progress bar with ∎ character
This tutorial is add on to the previous tutorial on how upload/receive progress indicator. Just a slight modification, where the progress is indicated by ∎ character and % completed.
NOTE : To add % sign after %v, use two % symbols.
Here you go :
package main
import (
"fmt"
"io"
"net/http"
"os"
"strings"
"time"
)
const (
barChar = "∎"
)
func uploadPage(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(fmt.Sprintf("<html><title>Go upload</title><body><form action='http://localhost:8080/receive' method='post' enctype='multipart/form-data'><label for='file'>Filename:</label><input type='file' name='file' id='file'><input type='submit' value='Upload' ></form></body></html>")))
}
func uploadProgress(w http.ResponseWriter, r *http.Request) {
mr, err := r.MultipartReader()
if err != nil {
fmt.Fprintln(w, err)
return
}
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 {
var read int64
var p float32
part, err := mr.NextPart()
if err == io.EOF {
fmt.Printf("\nDone!")
break
}
dst, err := os.OpenFile("upload.jpg", os.O_WRONLY|os.O_CREATE, 0666)
if err != nil {
return
}
var barLen int
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)
barLen = int(p)
//fmt.Printf("progress: %v \n", strings.Repeat(barChar,barLen))
<-ticker
fmt.Printf("\rStatus: %v [%v%%]", strings.Repeat(barChar, barLen), p)
//fmt.Printf("\rUploading progress %v", p) // for console
dst.Write(buffer[0:cBytes])
} else {
break
}
}
}
}
func main() {
mux := http.NewServeMux()
mux.HandleFunc("/", uploadPage)
mux.HandleFunc("/receive", uploadProgress)
http.ListenAndServe(":8080", mux)
}
Sample output :
go run uploadprogress.go
Status: ∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎∎ [99.915634%]
Last buffer read!
See also : Golang : Upload/Receive file progress indicator
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+6.5k Golang : HTTP Routing with Goji example
+11.4k Golang : Generate QR codes for Google Authenticator App and fix "Cannot interpret QR code" error
+5.5k Golang : Routes multiplexer routing example with regular expression control
+35.9k Golang : Convert string to array/slice
+3.4k Golang : Shortening import identifier
+11.3k Golang : Parsing or breaking down URL
+13k Golang : Get sub string example
+3k Golang : Check if a word is countable or not
+14.6k Golang : When to use public and private identifier(variable) and how to make the identifier public or private?
+31.5k Golang : convert(cast) bytes to string
+7.1k Golang : Fix go.exe is not compatible with the version of Windows you're running
+11.9k Golang : Get IP addresses of a domain name