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logging: added a log on panic 

Since panics still regularly "destroy" the terminal, it is hard to get a
stack trace for panics you do not anticipate. This commit adds a panic
handler that automatically creates a logfile inside the current working
directory.

It has to be added to every goroutine that is started and will repair
the terminal on a panic.

Signed-off-by: Moritz Poldrack <git@moritz.sh>
Acked-by: Robin Jarry <robin@jarry.cc>
This commit is contained in:
Moritz Poldrack 2022-03-22 09:52:27 +01:00 committed by Robin Jarry
parent feecc09b73
commit ae83373fa6
27 changed files with 161 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
aerc.go
View File

@ -7,7 +7,6 @@ import (
"io/ioutil"
"log"
"os"
"runtime/debug"
"sort"
"time"
@ -25,6 +24,7 @@ import (
"git.sr.ht/~rjarry/aerc/lib"
"git.sr.ht/~rjarry/aerc/lib/templates"
libui "git.sr.ht/~rjarry/aerc/lib/ui"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/widgets"
)
@ -112,6 +112,7 @@ func setWindowTitle() {
}
func main() {
defer logging.PanicHandler()
opts, optind, err := getopt.Getopts(os.Args, "v")
if err != nil {
log.Print(err)
@ -165,8 +166,6 @@ func main() {
ui *libui.UI
)
defer PanicTermFix(ui) // recover upon panic and try restoring the pty
aerc = widgets.NewAerc(conf, logger, func(cmd []string) error {
return execCommand(aerc, ui, cmd)
}, func(cmd string) []string {
@ -178,6 +177,9 @@ func main() {
panic(err)
}
defer ui.Close()
logging.UICleanup = func() {
ui.Close()
}
if conf.Ui.MouseEnabled {
ui.EnableMouse()
@ -225,19 +227,3 @@ func main() {
}
aerc.CloseBackends()
}
//FatalTermFix prints the stacktrace upon panic and tries to recover the term
// not doing that leaves the terminal in a broken state
func PanicTermFix(ui *libui.UI) {
var err interface{}
if err = recover(); err == nil {
return
}
debug.PrintStack()
if ui != nil {
ui.Close()
}
fmt.Fprintf(os.Stderr, "aerc crashed: %v\n", err)
os.Exit(1)
}

7
commands/account/compose.go
View File

@ -5,6 +5,7 @@ import (
"regexp"
"strings"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/widgets"
"git.sr.ht/~sircmpwn/getopt"
@ -52,7 +53,11 @@ func (Compose) Execute(aerc *widgets.Aerc, args []string) error {
}
tab.Content.Invalidate()
})
go composer.AppendContents(strings.NewReader(body))
go func() {
defer logging.PanicHandler()
composer.AppendContents(strings.NewReader(body))
}()
return nil
}

7
commands/account/recover.go
View File

@ -8,6 +8,7 @@ import (
"path/filepath"
"git.sr.ht/~rjarry/aerc/commands"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/widgets"
"git.sr.ht/~sircmpwn/getopt"
@ -111,7 +112,11 @@ func (Recover) Execute(aerc *widgets.Aerc, args []string) error {
tab.Name = subject
tab.Content.Invalidate()
})
go composer.AppendContents(bytes.NewReader(data))
go func() {
defer logging.PanicHandler()
composer.AppendContents(bytes.NewReader(data))
}()
// remove file if force flag is set
if force {

3
commands/compose/postpone.go
View File

@ -8,6 +8,7 @@ import (
"github.com/miolini/datacounter"
"github.com/pkg/errors"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/widgets"
"git.sr.ht/~rjarry/aerc/worker/types"
@ -66,6 +67,8 @@ func (Postpone) Execute(aerc *widgets.Aerc, args []string) error {
// run this as a goroutine so we can make other progress. The message
// will be saved once the directory is created.
go func() {
defer logging.PanicHandler()
errStr := <-errChan
if errStr != "" {
aerc.PushError(errStr)

5
commands/compose/send.go
View File

@ -16,6 +16,7 @@ import (
"github.com/pkg/errors"
"git.sr.ht/~rjarry/aerc/lib"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/widgets"
"git.sr.ht/~rjarry/aerc/worker/types"
@ -100,6 +101,8 @@ func (Send) Execute(aerc *widgets.Aerc, args []string) error {
failCh := make(chan error)
//writer
go func() {
defer logging.PanicHandler()
var sender io.WriteCloser
switch ctx.scheme {
case "smtp":
@ -131,6 +134,8 @@ func (Send) Execute(aerc *widgets.Aerc, args []string) error {
//cleanup + copy to sent
go func() {
defer logging.PanicHandler()
err = <-failCh
if err != nil {
aerc.PushError(strings.ReplaceAll(err.Error(), "\n", " "))

3
commands/exec.go
View File

@ -7,6 +7,7 @@ import (
"os/exec"
"time"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/widgets"
)
@ -45,6 +46,8 @@ func (ExecCmd) Execute(aerc *widgets.Aerc, args []string) error {
cmd.Env = env
go func() {
defer logging.PanicHandler()
err := cmd.Run()
if err != nil {
aerc.PushError(err.Error())

3
commands/msg/archive.go
View File

@ -8,6 +8,7 @@ import (
"time"
"git.sr.ht/~rjarry/aerc/commands"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/widgets"
"git.sr.ht/~rjarry/aerc/worker/types"
@ -94,6 +95,8 @@ func (Archive) Execute(aerc *widgets.Aerc, args []string) error {
}
// we need to do that in the background, else we block the main thread
go func() {
defer logging.PanicHandler()
wg.Wait()
if success {
aerc.PushStatus("Messages archived.", 10*time.Second)

5
commands/msg/pipe.go
View File

@ -9,6 +9,7 @@ import (
"time"
"git.sr.ht/~rjarry/aerc/commands"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/widgets"
"git.sr.ht/~rjarry/aerc/worker/types"
@ -89,6 +90,8 @@ func (Pipe) Execute(aerc *widgets.Aerc, args []string) error {
return
}
go func() {
defer logging.PanicHandler()
defer pipe.Close()
io.Copy(pipe, reader)
}()
@ -146,6 +149,8 @@ func (Pipe) Execute(aerc *widgets.Aerc, args []string) error {
})
go func() {
defer logging.PanicHandler()
select {
case <-done:
break

3
commands/msg/read.go
View File

@ -8,6 +8,7 @@ import (
"git.sr.ht/~sircmpwn/getopt"
"git.sr.ht/~rjarry/aerc/lib"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/widgets"
"git.sr.ht/~rjarry/aerc/worker/types"
@ -169,6 +170,8 @@ func (FlagMsg) Execute(aerc *widgets.Aerc, args []string) error {
// We need to do flagging in the background, else we block the main thread
go func() {
defer logging.PanicHandler()
wg.Wait()
if success {
aerc.PushStatus(actionName+" flag '"+flagName+"' successful", 10*time.Second)

3
commands/msgview/open.go
View File

@ -9,6 +9,7 @@ import (
"time"
"git.sr.ht/~rjarry/aerc/lib"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/widgets"
)
@ -66,6 +67,8 @@ func (Open) Execute(aerc *widgets.Aerc, args []string) error {
return
}
go func() {
defer logging.PanicHandler()
err := xdg.Wait()
if err != nil {
aerc.PushError(err.Error())

3
commands/msgview/save.go
View File

@ -13,6 +13,7 @@ import (
"github.com/mitchellh/go-homedir"
"git.sr.ht/~rjarry/aerc/commands"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/widgets"
)
@ -126,6 +127,8 @@ func (Save) Execute(aerc *widgets.Aerc, args []string) error {
// we need to wait for the callback prior to displaying a result
go func() {
defer logging.PanicHandler()
err := <-ch
if err != nil {
aerc.PushError(fmt.Sprintf("Save failed: %v", err))

3
commands/util.go
View File

@ -13,6 +13,7 @@ import (
"github.com/lithammer/fuzzysearch/fuzzy"
"git.sr.ht/~rjarry/aerc/lib"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/widgets"
"github.com/gdamore/tcell/v2"
@ -51,6 +52,8 @@ func QuickTerm(aerc *widgets.Aerc, args []string, stdin io.Reader) (*widgets.Ter
status := make(chan error, 1)
go func() {
defer logging.PanicHandler()
_, err := io.Copy(pipe, stdin)
defer pipe.Close()
status <- err

4
lib/open.go
View File

@ -3,6 +3,8 @@ package lib
import (
"os/exec"
"runtime"
"git.sr.ht/~rjarry/aerc/logging"
)
var openBin string = "xdg-open"
@ -49,6 +51,8 @@ func (xdg *xdgOpen) Start() error {
return err
}
go func() {
defer logging.PanicHandler()
xdg.errCh <- xdg.cmd.Wait()
close(xdg.errCh)
}()

9
lib/socket.go
View File

@ -13,6 +13,7 @@ import (
"sync/atomic"
"time"
"git.sr.ht/~rjarry/aerc/logging"
"github.com/kyoh86/xdg"
)
@ -36,6 +37,8 @@ func StartServer(logger *log.Logger) (*AercServer, error) {
}
// TODO: stash clients and close them on exit... bleh racey
go func() {
defer logging.PanicHandler()
for {
conn, err := l.Accept()
if err != nil {
@ -44,7 +47,11 @@ func StartServer(logger *log.Logger) (*AercServer, error) {
as.logger.Printf("Closing Unix server: %v", err)
return
}
go as.handleClient(conn)
go func() {
defer logging.PanicHandler()
as.handleClient(conn)
}()
}
}()
return as, nil

3
lib/ui/ui.go
View File

@ -3,6 +3,7 @@ package ui
import (
"sync/atomic"
"git.sr.ht/~rjarry/aerc/logging"
"github.com/gdamore/tcell/v2"
)
@ -43,6 +44,8 @@ func Initialize(content DrawableInteractive) (*UI, error) {
state.exit.Store(false)
go func() {
defer logging.PanicHandler()
for !state.ShouldExit() {
state.tcEvents <- screen.PollEvent()
}

56
logging/panic-logger.go Normal file
View File

@ -0,0 +1,56 @@
package logging
import (
"fmt"
"io"
"os"
"runtime/debug"
"strings"
"time"
)
var UICleanup = func() {}
// PanicHandler tries to restore the terminal. A stack trace is written to
// aerc-crash.log and then passed on if a panic occurs.
func PanicHandler() {
r := recover()
if r == nil {
return
}
UICleanup()
filename := time.Now().Format("/tmp/aerc-crash-20060102-150405.log")
panicLog, err := os.OpenFile(filename, os.O_SYNC|os.O_APPEND|os.O_CREATE|os.O_WRONLY|os.O_EXCL, 0o600)
if err != nil {
// we tried, not possible. bye
panic(r)
}
defer panicLog.Close()
outputs := io.MultiWriter(panicLog, os.Stderr)
// if any error happens here, we do not care.
fmt.Fprintln(panicLog, strings.Repeat("#", 80))
fmt.Fprint(panicLog, strings.Repeat(" ", 34))
fmt.Fprintln(panicLog, "PANIC CAUGHT!")
fmt.Fprint(panicLog, strings.Repeat(" ", 24))
fmt.Fprintln(panicLog, time.Now().Format("2006-01-02T15:04:05.000000-0700"))
fmt.Fprintln(panicLog, strings.Repeat("#", 80))
fmt.Fprintf(outputs, "%s\n", panicMessage)
fmt.Fprintf(panicLog, "Error: %v\n\n", r)
panicLog.Write(debug.Stack())
fmt.Fprintf(os.Stderr, "\nThis error was also written to: %s\n", filename)
panic(r)
}
const panicMessage = `
aerc has encountered a critical error and has terminated. Please help us fixing
this by sending this log and the steps to reproduce the crash to:
~rjarry/aerc-devel@lists.sr.ht
Thank you
`

7
widgets/account.go
View File

@ -13,6 +13,7 @@ import (
"git.sr.ht/~rjarry/aerc/lib/sort"
"git.sr.ht/~rjarry/aerc/lib/statusline"
"git.sr.ht/~rjarry/aerc/lib/ui"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/worker"
"git.sr.ht/~rjarry/aerc/worker/types"
@ -86,7 +87,11 @@ func NewAccountView(aerc *Aerc, conf *config.AercConfig, acct *config.AccountCon
view.msglist = NewMessageList(conf, logger, aerc)
view.grid.AddChild(view.msglist).At(0, 1)
go worker.Backend.Run()
go func() {
defer logging.PanicHandler()
worker.Backend.Run()
}()
worker.PostAction(&types.Configure{Config: acct}, nil)
worker.PostAction(&types.Connect{}, nil)

3
widgets/dirlist.go
View File

@ -16,6 +16,7 @@ import (
"git.sr.ht/~rjarry/aerc/lib"
libsort "git.sr.ht/~rjarry/aerc/lib/sort"
"git.sr.ht/~rjarry/aerc/lib/ui"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/worker/types"
)
@ -128,6 +129,8 @@ func (dirlist *DirectoryList) Select(name string) {
dirlist.skipSelect = make(chan bool)
go func() {
defer logging.PanicHandler()
select {
case <-time.After(dirlist.UiConfig().DirListDelay):
dirlist.worker.PostAction(&types.OpenDirectory{Directory: name},

9
widgets/msgviewer.go
View File

@ -19,6 +19,7 @@ import (
"git.sr.ht/~rjarry/aerc/lib"
"git.sr.ht/~rjarry/aerc/lib/format"
"git.sr.ht/~rjarry/aerc/lib/ui"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
)
@ -600,6 +601,8 @@ func (pv *PartViewer) attemptCopy() {
pv.copyFilterOutToPager() //delayed until we write to the sink
}
go func() {
defer logging.PanicHandler()
pv.writeMailHeaders()
if strings.EqualFold(pv.part.MIMEType, "text") {
// if the content is plain we can strip ansi control chars
@ -645,6 +648,8 @@ func (pv *PartViewer) copyFilterOutToPager() {
pv.filter.Start()
ch := make(chan interface{})
go func() {
defer logging.PanicHandler()
_, err := io.Copy(pv.pagerin, stdout)
if err != nil {
pv.err = err
@ -654,6 +659,8 @@ func (pv *PartViewer) copyFilterOutToPager() {
ch <- nil
}()
go func() {
defer logging.PanicHandler()
_, err := io.Copy(pv.pagerin, stderr)
if err != nil {
pv.err = err
@ -663,6 +670,8 @@ func (pv *PartViewer) copyFilterOutToPager() {
ch <- nil
}()
go func() {
defer logging.PanicHandler()
<-ch
<-ch
pv.filter.Wait()

3
widgets/spinner.go
View File

@ -9,6 +9,7 @@ import (
"git.sr.ht/~rjarry/aerc/config"
"git.sr.ht/~rjarry/aerc/lib/ui"
"git.sr.ht/~rjarry/aerc/logging"
)
type Spinner struct {
@ -37,6 +38,8 @@ func (s *Spinner) Start() {
atomic.StoreInt64(&s.frame, 0)
go func() {
defer logging.PanicHandler()
for {
select {
case <-s.stop:

3
widgets/status.go
View File

@ -8,6 +8,7 @@ import (
"git.sr.ht/~rjarry/aerc/config"
"git.sr.ht/~rjarry/aerc/lib/ui"
"git.sr.ht/~rjarry/aerc/logging"
)
type StatusLine struct {
@ -78,6 +79,8 @@ func (status *StatusLine) Push(text string, expiry time.Duration) *StatusMessage
}
status.stack = append(status.stack, msg)
go (func() {
defer logging.PanicHandler()
time.Sleep(expiry)
for i, m := range status.stack {
if m == msg {

3
widgets/terminal.go
View File

@ -7,6 +7,7 @@ import (
"syscall"
"git.sr.ht/~rjarry/aerc/lib/ui"
"git.sr.ht/~rjarry/aerc/logging"
"github.com/creack/pty"
vterm "github.com/ddevault/go-libvterm"
@ -124,6 +125,8 @@ func NewTerminal(cmd *exec.Cmd) (*Terminal, error) {
term.start = make(chan interface{})
screen := term.vterm.ObtainScreen()
go func() {
defer logging.PanicHandler()
<-term.start
buf := make([]byte, 4096)
for {

3
worker/imap/fetch.go
View File

@ -10,6 +10,7 @@ import (
"github.com/emersion/go-message/mail"
"github.com/emersion/go-message/textproto"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/worker/types"
)
@ -169,6 +170,8 @@ func (imapw *IMAPWorker) handleFetchMessages(
done := make(chan error)
go func() {
defer logging.PanicHandler()
var reterr error
for _msg := range messages {
imapw.seqMap[_msg.SeqNum-1] = _msg.Uid

3
worker/imap/flags.go
View File

@ -4,6 +4,7 @@ import (
"fmt"
"github.com/emersion/go-imap"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/worker/types"
)
@ -22,6 +23,8 @@ func (imapw *IMAPWorker) handleDeleteMessages(msg *types.DeleteMessages) {
ch := make(chan uint32)
done := make(chan interface{})
go func() {
defer logging.PanicHandler()
for seqNum := range ch {
i := seqNum - 1
deleted = append(deleted, imapw.seqMap[i])

3
worker/imap/list.go
View File

@ -3,6 +3,7 @@ package imap
import (
"github.com/emersion/go-imap"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/worker/types"
)
@ -13,6 +14,8 @@ func (imapw *IMAPWorker) handleListDirectories(msg *types.ListDirectories) {
done := make(chan interface{})
go func() {
defer logging.PanicHandler()
for mbox := range mailboxes {
if !canOpen(mbox) {
// no need to pass this to handlers if it can't be opened

3
worker/imap/worker.go
View File

@ -17,6 +17,7 @@ import (
"golang.org/x/oauth2"
"git.sr.ht/~rjarry/aerc/lib"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/worker/handlers"
"git.sr.ht/~rjarry/aerc/worker/types"
@ -83,6 +84,8 @@ func (w *IMAPWorker) handleMessage(msg types.WorkerMessage) error {
if w.client != nil && w.client.State() == imap.SelectedState {
w.idleStop = make(chan struct{})
go func() {
defer logging.PanicHandler()
w.idleDone <- w.client.Idle(w.idleStop, &client.IdleOptions{LogoutTimeout: 0, PollInterval: 0})
}()
}

3
worker/notmuch/worker.go
View File

@ -16,6 +16,7 @@ import (
"git.sr.ht/~rjarry/aerc/config"
"git.sr.ht/~rjarry/aerc/lib/uidstore"
"git.sr.ht/~rjarry/aerc/logging"
"git.sr.ht/~rjarry/aerc/models"
"git.sr.ht/~rjarry/aerc/worker/handlers"
"git.sr.ht/~rjarry/aerc/worker/lib"
@ -180,6 +181,8 @@ func (w *worker) handleConnect(msg *types.Connect) error {
w.done(msg)
w.emitLabelList()
go func() {
defer logging.PanicHandler()
for {
w.nmEvents <- &updateDirCounts{}
time.Sleep(backgroundRefreshDelay)