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os_util.go
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os_util.go
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package elasticthought
import (
"bufio"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"os/exec"
"github.com/couchbaselabs/logg"
"github.com/nu7hatch/gouuid"
)
func Mkdir(directory string) error {
if err := os.MkdirAll(directory, 0777); err != nil {
return err
}
return nil
}
func streamToFile(r io.Reader, path string) error {
f, err := os.Create(path)
if err != nil {
return err
}
w := bufio.NewWriter(f)
defer w.Flush()
_, err = io.Copy(w, r)
if err != nil {
return err
}
return nil
}
// copyFileContents copies the contents of the file named src to the file named
// by dst. The file will be created if it does not already exist. If the
// destination file exists, all it's contents will be replaced by the contents
// of the source file.
//
// Source: http://stackoverflow.com/questions/21060945/simple-way-to-copy-a-file-in-golang
func CopyFileContents(src, dst string) (err error) {
in, err := os.Open(src)
if err != nil {
return
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return
}
defer func() {
cerr := out.Close()
if err == nil {
err = cerr
}
}()
if _, err = io.Copy(out, in); err != nil {
return
}
err = out.Sync()
return
}
func NewUuid() string {
u4, err := uuid.NewV4()
if err != nil {
logg.LogPanic("Error generating uuid", err)
}
return fmt.Sprintf("%s", u4)
}
func saveCmdOutputToFiles(cmdStdout, cmdStderr io.ReadCloser, stdOutPath, stdErrPath string) error {
stdOutDoneChan := make(chan error, 1)
stdErrDoneChan := make(chan error, 1)
// also, Tee everything to this processes' stdout/stderr
cmdStderrTee := io.TeeReader(cmdStderr, os.Stderr)
cmdStdoutTee := io.TeeReader(cmdStdout, os.Stdout)
// spawn goroutines to read from stdout/stderr
go func() {
if err := streamToFile(cmdStdoutTee, stdOutPath); err != nil {
stdOutDoneChan <- err
} else {
stdOutDoneChan <- nil
}
}()
go func() {
if err := streamToFile(cmdStderrTee, stdErrPath); err != nil {
stdErrDoneChan <- err
} else {
stdErrDoneChan <- nil
}
}()
// wait for goroutines
stdOutResult := <-stdOutDoneChan
stdErrResult := <-stdErrDoneChan
// check for errors
results := []error{stdOutResult, stdErrResult}
for _, result := range results {
if result != nil {
return fmt.Errorf("Saving cmd output failed: %v", result)
}
}
return nil
}
func runCmdTeeStdio(cmd *exec.Cmd, stdOutPath, stdErrPath string) error {
stdout, err := cmd.StdoutPipe()
if err != nil {
return fmt.Errorf("Error running caffe: StdoutPipe(). Err: %v", err)
}
stderr, err := cmd.StderrPipe()
if err != nil {
return fmt.Errorf("Error running caffe: StderrPipe(). Err: %v", err)
}
if err := cmd.Start(); err != nil {
return fmt.Errorf("Error running caffe: cmd.Start(). Err: %v", err)
}
// read from stdout, stderr and write to temp files
if err := saveCmdOutputToFiles(stdout, stderr, stdOutPath, stdErrPath); err != nil {
return fmt.Errorf("Error running command: saveCmdOutput. Err: %v", err)
}
// wait for the command to complete
runCommandErr := cmd.Wait()
return runCommandErr
}
func containsString(values []string, testValue string) bool {
for _, v := range values {
if v == testValue {
return true
}
}
return false
}
func getUrlContent(url string) ([]byte, error) {
// open stream to source url
resp, err := http.Get(url)
if err != nil {
return nil, fmt.Errorf("Error doing GET on: %v. %v", url, err)
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, fmt.Errorf("%v response to GET on: %v", resp.StatusCode, url)
}
sourceBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("Error reading body from: %v. %v", url, err)
}
return sourceBytes, nil
}