From 79dfe23a8cfabe4688a3b05998178a11ea51150c Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Fri, 15 Jul 2016 00:15:55 +0200
Subject: improved canceling


diff --git a/rhimport/converter.go b/rhimport/converter.go
index 0546b97..7c35c07 100644
--- a/rhimport/converter.go
+++ b/rhimport/converter.go
@@ -29,6 +29,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"net/http"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -133,9 +134,16 @@ func (ff *FFMpegFetchConverter) Close() (err error) {
 
 func (ff *FFMpegFetchConverter) GetResult(ctx *Context, res *Result) (result string, err error) {
 	if ff.result != nil {
-		r := <-ff.result
-		ctx.LoudnessCorr = r.loudnessCorr
-		return r.output, r.err
+		select {
+		case r := <-ff.result:
+			ctx.LoudnessCorr = r.loudnessCorr
+			return r.output, r.err
+		case <-ctx.Cancel:
+			ff.cmd.Process.Kill()
+			res.ResponseCode = http.StatusNoContent
+			res.ErrorString = "canceled"
+			return "", errors.New("canceled")
+		}
 	}
 	return "", nil
 }
@@ -201,9 +209,16 @@ func (bs *BS1770FetchConverter) Close() (err error) {
 
 func (bs *BS1770FetchConverter) GetResult(ctx *Context, res *Result) (result string, err error) {
 	if bs.result != nil {
-		r := <-bs.result
-		ctx.LoudnessCorr = r.loudnessCorr
-		return r.output, r.err
+		select {
+		case r := <-bs.result:
+			ctx.LoudnessCorr = r.loudnessCorr
+			return r.output, r.err
+		case <-ctx.Cancel:
+			bs.cmd.Process.Kill()
+			res.ResponseCode = http.StatusNoContent
+			res.ErrorString = "canceled"
+			return "", errors.New("canceled")
+		}
 	}
 	return "", nil
 }
@@ -284,13 +299,29 @@ func (ff *FFMpegBS1770FetchConverter) Close() (err error) {
 }
 
 func (ff *FFMpegBS1770FetchConverter) GetResult(ctx *Context, res *Result) (result string, err error) {
-	var rff, rbs FetchConverterResult
-	if ff.resultFF != nil {
-		rff = <-ff.resultFF
+	if ff.resultFF == nil || ff.resultBS == nil {
+		return "", nil
 	}
-	if ff.resultBS != nil {
-		rbs = <-ff.resultBS
+
+	var rff, rbs *FetchConverterResult
+	for {
+		select {
+		case r := <-ff.resultFF:
+			rff = &r
+		case r := <-ff.resultBS:
+			rbs = &r
+		case <-ctx.Cancel:
+			ff.ffmpeg.Process.Kill()
+			ff.bs1770.Process.Kill()
+			res.ResponseCode = http.StatusNoContent
+			res.ErrorString = "canceled"
+			return "", errors.New("canceled")
+		}
+		if rff != nil && rbs != nil {
+			break
+		}
 	}
+
 	if rff.err != nil {
 		return rff.output, fmt.Errorf("ffmpeg: %v", rff.err)
 	}
diff --git a/rhimport/fetcher.go b/rhimport/fetcher.go
index 4d942fa..1a957c3 100644
--- a/rhimport/fetcher.go
+++ b/rhimport/fetcher.go
@@ -364,6 +364,7 @@ func fetchFileArchiv(ctx *Context, res *Result, uri *url.URL) (err error) {
 
 	rhdl.Printf("importing archiv file from %s", scpuri)
 	err = easy.Perform()
+
 	var convOut string
 	var convErr error
 	if cbdata.conv != nil {
@@ -412,7 +413,6 @@ func fetchFileTmp(ctx *Context, res *Result, uri *url.URL) (err error) {
 }
 
 func fetchFileDirConvert(ctx *Context, res *Result, origSrc *os.File, sizeTotal int64) (err error) {
-
 	basepath, err := ioutil.TempDir(ctx.conf.TempDir, "rhimportd-")
 	if err != nil {
 		return err
@@ -452,14 +452,28 @@ func fetchFileDirConvert(ctx *Context, res *Result, origSrc *os.File, sizeTotal
 				ctx.ProgressCallBack = nil
 			}
 		}
+
+		if ctx.Cancel != nil && len(ctx.Cancel) > 0 {
+			res.ResponseCode = http.StatusNoContent
+			res.ErrorString = "canceled"
+			break
+		}
 	}
 
 	conv.Close()
+	if res.ResponseCode == http.StatusNoContent {
+		rhl.Printf("converting of '%s' got canceled", ctx.SourceUri)
+		return nil
+	}
+
 	rhl.Printf("waiting for converter to finish...")
-	if convOut, convErr := conv.GetResult(ctx, res); convErr != nil {
-		if convOut != "" {
-			rhl.Printf("converter error: %v; converter output: %s", convErr, convOut)
+	convOut, convErr := conv.GetResult(ctx, res)
+	if convErr != nil {
+		if res.ResponseCode == http.StatusNoContent {
+			rhl.Printf("converting of '%s' got canceled", ctx.SourceUri)
+			return nil
 		}
+		rhl.Printf("converter error: %v; converter output: %s", convErr, convOut)
 		return fmt.Errorf("converter error: %v; converter output: %s", convErr, convOut)
 	}
 	rhdl.Printf("converter: loudness correction = %.2f dB", ctx.LoudnessCorr)
@@ -583,15 +597,10 @@ func fetchFileFake(ctx *Context, res *Result, uri *url.URL) error {
 }
 
 func writeAttachmentFile(ctx *Context, res *Result, sizeTotal uint64, conv FetchConverter) error {
-	cancel := ctx.Cancel
-	if cancel == nil {
-		cancel = make(<-chan bool)
-	}
-
 	written := uint64(0)
 	for {
 		select {
-		case <-cancel:
+		case <-ctx.Cancel:
 			rhl.Printf("receiving attachment '%s' got canceled", ctx.SourceFile)
 			res.ResponseCode = http.StatusNoContent
 			res.ErrorString = "canceled"
@@ -671,15 +680,22 @@ func fetchFileAttachment(ctx *Context, res *Result, uri *url.URL) error {
 
 	err = writeAttachmentFile(ctx, res, sizeTotal, conv)
 	conv.Close()
+	if res.ResponseCode == http.StatusNoContent {
+		rhl.Printf("download of '%s' got canceled", ctx.SourceUri)
+		return nil
+	}
+
 	rhl.Printf("waiting for converter to finish...")
 	convOut, convErr := conv.GetResult(ctx, res)
 	if err != nil {
 		return err
 	}
 	if convErr != nil {
-		if convOut != "" {
-			rhl.Printf("converter error: %v; converter output: %s", convErr, convOut)
+		if res.ResponseCode == http.StatusNoContent {
+			rhl.Printf("download of '%s' got canceled", ctx.SourceUri)
+			return nil
 		}
+		rhl.Printf("converter error: %v; converter output: %s", convErr, convOut)
 		return fmt.Errorf("converter error: %v; converter output: %s", convErr, convOut)
 	}
 	rhdl.Printf("converter: loudness correction = %.2f dB", ctx.LoudnessCorr)
-- 
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