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diff --git a/remote/doc/Debugging.md b/remote/doc/Debugging.md new file mode 100644 index 0000000000..2cf03fcfca --- /dev/null +++ b/remote/doc/Debugging.md @@ -0,0 +1,54 @@ +# Debugging + +For other debugging resources, see also: Remote project [wiki] + +## Increasing the logging verbosity + +To increase the internal logging verbosity you can use the +`remote.log.level` [preference]. + +If you use mach to start Firefox: + +```shell +% ./mach run --setpref "remote.log.level=Trace" --remote-debugging-port +``` + +By default, long log lines are truncated. To print long lines in full, you +can set `remote.log.truncate` to false. + +## Enabling logging of emitted events + +To dump events produced by EventEmitter, +including CDP events produced by the Remote Agent, +you can use the `toolkit.dump.emit` [preference]: + +```shell +% ./mach run --setpref "toolkit.dump.emit=true" --remote-debugging-port +``` + +## Logging observer notifications + +Observer notifications are used extensively throughout the +code and it can sometimes be useful to log these to see what is +available and when they are fired. + +The `MOZ_LOG` environment variable controls the C++ logs and takes +the name of the subsystem along with a verbosity setting. See +[prlog.h] for more details. + +```shell +MOZ_LOG=ObserverService:5 +``` + +You can optionally redirect logs away from stdout to a file: + +```shell +MOZ_LOG_FILE=service.log +``` + +This enables `LogLevel::Debug` level information and places all +output in the file service.log in your current working directory. + +[preference]: Prefs.md +[prlog.h]: https://searchfox.org/mozilla-central/source/nsprpub/pr/include/prlog.h +[wiki]: https://wiki.mozilla.org/Remote/Developer_Resources |