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golang pipe the http response
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package main | |
import ( | |
"io" | |
"net/http" | |
"os/exec" | |
) | |
var ( | |
BUF_LEN = 1024 | |
) | |
func handler(w http.ResponseWriter, r *http.Request) { | |
cmd := exec.Command("./build.sh") | |
pipeReader, pipeWriter := io.Pipe() | |
cmd.Stdout = pipeWriter | |
cmd.Stderr = pipeWriter | |
go writeCmdOutput(w, pipeReader) | |
cmd.Run() | |
pipeWriter.Close() | |
} | |
func writeCmdOutput(res http.ResponseWriter, pipeReader *io.PipeReader) { | |
buffer := make([]byte, BUF_LEN) | |
for { | |
n, err := pipeReader.Read(buffer) | |
if err != nil { | |
pipeReader.Close() | |
break | |
} | |
data := buffer[0:n] | |
res.Write(data) | |
if f, ok := res.(http.Flusher); ok { | |
f.Flush() | |
} | |
//reset buffer | |
for i := 0; i < n; i++ { | |
buffer[i] = 0 | |
} | |
} | |
} | |
func main() { | |
http.HandleFunc("/", handler) | |
http.ListenAndServe(":8080", nil) | |
} |
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