author | Matthew Wild <mwild1@gmail.com> |
Tue, 16 Apr 2024 10:42:25 +0100 | |
changeset 5886 | 563c2c70cb9f |
parent 5856 | 133b23758cf6 |
permissions | -rw-r--r-- |
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labels: |
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- 'Stage-Beta' |
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summary: 'Log to in-memory ringbuffer' |
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... |
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Introduction |
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============ |
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Sometimes debug logs are too verbose for continuous logging to disk. However |
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occasionally you may be interested in the debug logs when a certain event occurs. |
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This module allows you to store all logs in a fixed-size buffer in Prosody's memory, |
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and dump them to a file whenever you want. |
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# Configuration |
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First of all, you need to load the module by adding it to your global `modules_enabled`: |
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``` {.lua} |
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modules_enabled = { |
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... |
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"log_ringbuffer"; |
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... |
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} |
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``` |
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By default the module will do nothing - you need to configure a log sink, using Prosody's |
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usual [logging configuration](https://prosody.im/doc/advanced_logging). |
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``` {.lua} |
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log = { |
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-- Log errors to a file |
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error = "/var/log/prosody/prosody.err"; |
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-- Log debug and higher to a 2MB buffer |
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{ to = "ringbuffer", size = 1024*1024*2, filename_template = "debug-logs-{pid}-{count}.log", signal = "SIGUSR2" }; |
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} |
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``` |
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The possible fields of the logging config entry are: |
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`to` |
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: Set this to `"ringbuffer"`. |
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`levels` |
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: The log levels to capture, e.g. `{ min = "debug" }`. By default, all levels are captured. |
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`size` |
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: The size, in bytes, of the buffer. When the buffer fills, |
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old data will be overwritten by new data. |
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`lines` |
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: If specified, preserves the latest N complete lines in the |
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buffer. The `size` option is ignored when this option is set. |
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`filename` |
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: The name of the file to dump logs to when triggered. |
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`filename_template` |
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: This parameter may optionally be specified instead of `filename. It |
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may contain a number of variables, described below. Defaults to |
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`"{paths.data}/ringbuffer-logs-{pid}-{count}.log"`. |
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Only one of the following triggers may be specified: |
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`signal` |
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: A signal that will cause the buffer to be dumped, e.g. `"SIGUSR2"`. |
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Do not use any signal that is used by any other Prosody module, to |
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avoid conflicts. |
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`event` |
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: Alternatively, the name of a Prosody global event that will trigger |
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the logs to be dumped, e.g. `"config-reloaded"`. |
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## Filename variables |
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If `filename_template` is specified instead of `filename`, it may contain |
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any of the following variables in curly braces, e.g. `{pid}`. |
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`pid` |
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: The PID of the current process |
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`count` |
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: A counter that begins at 0 and increments for each dump made by |
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the current process. |
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`time` |
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: The unix timestamp at which the dump is made. It can be formatted |
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to human-readable local time using `{time|yyyymmdd}` and `{time|hhmmss}`. |
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`paths` |
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: Allows access to Prosody's known filesystem paths, use e.g. `{paths.data}` |
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for the path to Prosody's data directory. |
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The filename does not have to be unique for every dump - if a file with the same |
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name already exists, it will be appended to. |
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## Integration with mod_debug_traceback |
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This module can be used in combination with [mod_debug_traceback] so that debug |
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logs are dumped at the same time as the traceback. Use the following configuration: |
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``` {.lua} |
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log = { |
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--- |
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-- other optional logging config here -- |
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--- |
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{ |
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to = "ringbuffer"; |
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filename_template = "{paths.data}/traceback-{pid}-{count}.log"; |
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event = "debug_traceback/triggered"; |
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}; |
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} |
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``` |
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|
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If the filename template matches the traceback path, both logs and traceback will |
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be combined into the same file. Of course separate files can be specified if preferred. |
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|
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# Compatibility |
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0.12 and later. |