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48 lines
1.9 KiB
Markdown
48 lines
1.9 KiB
Markdown
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# `lnav` config for Synapse logs
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[lnav](https://lnav.org/) is a log-viewing tool. It is particularly useful when
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you need to interleave multiple log files, or for exploring a large log file
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with regex filters. The downside is that it is not as ubiquitous as tools like
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`less`, `grep`, etc.
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This directory contains an `lnav` [log format definition](
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https://docs.lnav.org/en/v0.10.1/formats.html#defining-a-new-format
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) for Synapse logs as
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emitted by Synapse with the default [logging configuration](
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https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#log_config
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). It supports lnav 0.10.1 because that's what's packaged by my distribution.
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This should allow lnav:
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- to interpret timestamps, allowing log interleaving;
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- to interpret log severity levels, allowing colouring by log level(!!!);
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- to interpret request IDs, allowing you to skip through a specific request; and
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- to highlight room, event and user IDs in logs.
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See also https://gist.github.com/benje/e2ab750b0a81d11920d83af637d289f7 for a
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similar example.
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## Example
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[](https://asciinema.org/a/556133)
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## Tips
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- `lnav -i /path/to/synapse/checkout/contrib/lnav/synapse-log-format.json`
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- `lnav my_synapse_log_file` or `lnav synapse_log_files.*`, etc.
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- `lnav --help` for CLI help.
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Within lnav itself:
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- `?` for help within lnav itself.
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- `q` to quit.
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- `/` to search a-la `less` and `vim`, then `n` and `N` to continue searching
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down and up.
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- Use `o` and `O` to skip through logs based on the request ID (`POST-1234`, or
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else the value of the [`request_id_header`](
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https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html?highlight=request_id_header#listeners
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) header). This may get confused if the same request ID is repeated among
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multiple files or process restarts.
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- ???
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- Profit
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