How to report the full logcat when a crash is triggered in Android?

[MrZhaobh]

Integration

sentry-android

Build System

Gradle

AGP Version

7.4.2

Proguard

Enabled

Version

4.14.1

Steps to Reproduce

When I use the following code, I find that the log captured is the log after the next startup, not the log when the crash occurs. I hope that when the crash occurs, I can first capture the recent log and save it, and then bring it when the report is triggered next time.

            options.addEventProcessor(new EventProcessor() {
                @Override
                public SentryEvent process(SentryEvent event, Hint hint) {
                    try {
                        String logcatCmd = "logcat -t 200 --pid " + android.os.Process.myPid() + " *:V";
                        Process process = Runtime.getRuntime().exec(logcatCmd);
                        InputStream input = process.getInputStream();
                        FileOutputStream out = context.openFileOutput("sentry_logcat.txt", Context.MODE_APPEND);
                        byte[] buffer = new byte[4096];
                        int bytesRead;
                        while ((bytesRead = input.read(buffer)) != -1) {
                            out.write(buffer, 0, bytesRead);
                        }
                        out.close();
                        input.close();
                        hint.addAttachment(new Attachment(
                                context.getFilesDir().getPath() + "/sentry_logcat.txt",
                                "sentry_logcat.txt",
                                "text/plain"
                        ));
                    } catch (Exception e) {
                        Log.e("Sentry",e.getMessage());
                    }
                    return event;
                }
            });

Expected Result

I hope that when the crash occurs, I can first capture the recent log and save it, and then bring it when the report is triggered next time.

Actual Result

none

[philprime]

Hi @MrZhaobh, thanks for raising this question.

@markushi @romtsn do you have any insights on this? Would this be something that could be done with Sentry Logs when it becomes available for mobile as well?

[markushi]

@MrZhaobh Actually you should usually see the logs from your current session. Only if you're facing a native (C/C++) crash the events are processed and sent on the next app start.

Our upcoming logs product will probably make you're life a bit easier, as the logs will be continuously streamed to sentry.
In the meantime I'd advise taking a look at our existing logcat integration, which attaches logs as breadcrumbs to your events: https://docs.sentry.io/platforms/android/integrations/logcat/