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// Package signal contains helpers to exchange the SDP session
// description between examples.
package signal
import (
"bufio"
"bytes"
"compress/gzip"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
)
// Allows compressing offer/answer to bypass terminal input limits.
const compress = false
// MustReadStdin blocks until input is received from stdin
func MustReadStdin() string {
r := bufio.NewReader(os.Stdin)
var in string
for {
var err error
in, err = r.ReadString('\n')
if err != io.EOF {
if err != nil {
panic(err)
}
}
in = strings.TrimSpace(in)
if len(in) > 0 {
break
}
}
fmt.Println("")
return in
}
// Encode encodes the input in base64
// It can optionally zip the input before encoding
func Encode(obj interface{}) string {
b, err := json.Marshal(obj)
if err != nil {
panic(err)
}
if compress {
b = zip(b)
}
return base64.StdEncoding.EncodeToString(b)
}
// Decode decodes the input from base64
// It can optionally unzip the input after decoding
func Decode(in string, obj interface{}) {
b, err := base64.StdEncoding.DecodeString(in)
if err != nil {
panic(err)
}
if compress {
b = unzip(b)
}
err = json.Unmarshal(b, obj)
if err != nil {
panic(err)
}
}
func zip(in []byte) []byte {
var b bytes.Buffer
gz := gzip.NewWriter(&b)
_, err := gz.Write(in)
if err != nil {
panic(err)
}
err = gz.Flush()
if err != nil {
panic(err)
}
err = gz.Close()
if err != nil {
panic(err)
}
return b.Bytes()
}
func unzip(in []byte) []byte {
var b bytes.Buffer
_, err := b.Write(in)
if err != nil {
panic(err)
}
r, err := gzip.NewReader(&b)
if err != nil {
panic(err)
}
res, err := ioutil.ReadAll(r)
if err != nil {
panic(err)
}
return res
}
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