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Fix mangled JSON output by backup command

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jsonstatus wrote the JSON output without synchronization to the
stdio_wrapper which caused mangling between different status lines.

Use the Print and Error methods of termstatus instead which use a
central goroutine to synchronize output.
This commit is contained in:
Michael Eischer 2020-01-12 14:22:52 +01:00
parent af20015725
commit ef70a2fcb3
1 changed files with 26 additions and 11 deletions
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37
internal/ui/jsonstatus/status.go
View file

@ -1,6 +1,7 @@
package jsonstatus
import (
"bytes"
"context"
"encoding/json"
"os"
@ -74,6 +75,20 @@ func NewBackup(term *termstatus.Terminal, verbosity uint) *Backup {
}
}
func toJSONString(status interface{}) string {
buf := new(bytes.Buffer)
json.NewEncoder(buf).Encode(status)
return buf.String()
}
func (b *Backup) print(status interface{}) {
b.term.Print(toJSONString(status))
}
func (b *Backup) error(status interface{}) {
b.term.Error(toJSONString(status))
}
// Run regularly updates the status lines. It should be called in a separate
// goroutine.
func (b *Backup) Run(ctx context.Context) error {
@ -162,13 +177,13 @@ func (b *Backup) update(total, processed counter, errors uint, currentFiles map[
}
sort.Strings(status.CurrentFiles)
json.NewEncoder(b.StdioWrapper.Stdout()).Encode(status)
b.print(status)
}
// ScannerError is the error callback function for the scanner, it prints the
// error in verbose mode and returns nil.
func (b *Backup) ScannerError(item string, fi os.FileInfo, err error) error {
json.NewEncoder(b.StdioWrapper.Stderr()).Encode(errorUpdate{
b.error(errorUpdate{
MessageType: "error",
Error: err,
During: "scan",
@ -179,7 +194,7 @@ func (b *Backup) ScannerError(item string, fi os.FileInfo, err error) error {
// Error is the error callback function for the archiver, it prints the error and returns nil.
func (b *Backup) Error(item string, fi os.FileInfo, err error) error {
json.NewEncoder(b.StdioWrapper.Stderr()).Encode(errorUpdate{
b.error(errorUpdate{
MessageType: "error",
Error: err,
During: "archival",
@ -233,7 +248,7 @@ func (b *Backup) CompleteItem(item string, previous, current *restic.Node, s arc
if current.Type == "dir" {
if previous == nil {
if b.v >= 3 {
json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
b.print(verboseUpdate{
MessageType: "verbose_status",
Action: "new",
Item: item,
@ -250,7 +265,7 @@ func (b *Backup) CompleteItem(item string, previous, current *restic.Node, s arc
if previous.Equals(*current) {
if b.v >= 3 {
json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
b.print(verboseUpdate{
MessageType: "verbose_status",
Action: "unchanged",
Item: item,
@ -261,7 +276,7 @@ func (b *Backup) CompleteItem(item string, previous, current *restic.Node, s arc
b.summary.Unlock()
} else {
if b.v >= 3 {
json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
b.print(verboseUpdate{
MessageType: "verbose_status",
Action: "modified",
Item: item,
@ -284,7 +299,7 @@ func (b *Backup) CompleteItem(item string, previous, current *restic.Node, s arc
if previous == nil {
if b.v >= 3 {
json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
b.print(verboseUpdate{
MessageType: "verbose_status",
Action: "new",
Item: item,
@ -300,7 +315,7 @@ func (b *Backup) CompleteItem(item string, previous, current *restic.Node, s arc
if previous.Equals(*current) {
if b.v >= 3 {
json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
b.print(verboseUpdate{
MessageType: "verbose_status",
Action: "unchanged",
Item: item,
@ -311,7 +326,7 @@ func (b *Backup) CompleteItem(item string, previous, current *restic.Node, s arc
b.summary.Unlock()
} else {
if b.v >= 3 {
json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
b.print(verboseUpdate{
MessageType: "verbose_status",
Action: "modified",
Item: item,
@ -335,7 +350,7 @@ func (b *Backup) ReportTotal(item string, s archiver.ScanStats) {
if item == "" {
if b.v >= 2 {
json.NewEncoder(b.StdioWrapper.Stdout()).Encode(verboseUpdate{
b.print(verboseUpdate{
MessageType: "status",
Action: "scan_finished",
Duration: time.Since(b.start).Seconds(),
@ -351,7 +366,7 @@ func (b *Backup) ReportTotal(item string, s archiver.ScanStats) {
// Finish prints the finishing messages.
func (b *Backup) Finish(snapshotID restic.ID) {
close(b.finished)
json.NewEncoder(b.StdioWrapper.Stdout()).Encode(summaryOutput{
b.print(summaryOutput{
MessageType: "summary",
FilesNew: b.summary.Files.New,
FilesChanged: b.summary.Files.Changed,