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annotate mod_log_ringbuffer/README.markdown @ 5853:97c9b76867ca

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mod_log_ringbuffer: Detach event handlers on logging reload (thanks Menel) Otherwise the global event handlers accumulate, one added each time logging is reoladed, and each invocation of the signal or event triggers one dump of each created ringbuffer.
author Kim Alvefur <zash@zash.se>
date Sun, 03 Mar 2024 11:23:40 +0100
parents 133b23758cf6
children
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1 ---
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2 labels:
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3 - 'Stage-Beta'
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4 summary: 'Log to in-memory ringbuffer'
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5 ...
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6
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7 Introduction
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8 ============
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9
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10 Sometimes debug logs are too verbose for continuous logging to disk. However
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11 occasionally you may be interested in the debug logs when a certain event occurs.
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12
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13 This module allows you to store all logs in a fixed-size buffer in Prosody's memory,
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14 and dump them to a file whenever you want.
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15
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16 # Configuration
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18 First of all, you need to load the module by adding it to your global `modules_enabled`:
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19
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20 ``` {.lua}
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21 modules_enabled = {
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22 ...
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23 "log_ringbuffer";
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24 ...
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25 }
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26 ```
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27
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28 By default the module will do nothing - you need to configure a log sink, using Prosody's
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29 usual [logging configuration](https://prosody.im/doc/advanced_logging).
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30
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31 ``` {.lua}
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32 log = {
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33 -- Log errors to a file
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34 error = "/var/log/prosody/prosody.err";
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35
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36 -- Log debug and higher to a 2MB buffer
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37 { to = "ringbuffer", size = 1024*1024*2, filename_template = "debug-logs-{pid}-{count}.log", signal = "SIGUSR2" };
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38 }
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39 ```
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40
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41 The possible fields of the logging config entry are:
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42
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43 `to`
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44 : Set this to `"ringbuffer"`.
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45
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46 `levels`
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47 : The log levels to capture, e.g. `{ min = "debug" }`. By default, all levels are captured.
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48
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49 `size`
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50 : The size, in bytes, of the buffer. When the buffer fills,
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51 old data will be overwritten by new data.
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52
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53 `lines`
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54 : If specified, preserves the latest N complete lines in the
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55 buffer. The `size` option is ignored when this option is set.
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56
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57 `filename`
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58 : The name of the file to dump logs to when triggered.
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59
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60 `filename_template`
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61 : This parameter may optionally be specified instead of `filename. It
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62 may contain a number of variables, described below. Defaults to
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63 `"{paths.data}/ringbuffer-logs-{pid}-{count}.log"`.
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64
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65 Only one of the following triggers may be specified:
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66
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67 `signal`
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68 : A signal that will cause the buffer to be dumped, e.g. `"SIGUSR2"`.
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69 Do not use any signal that is used by any other Prosody module, to
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70 avoid conflicts.
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71
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72 `event`
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73 : Alternatively, the name of a Prosody global event that will trigger
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74 the logs to be dumped, e.g. `"config-reloaded"`.
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75
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76 ## Filename variables
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77
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78 If `filename_template` is specified instead of `filename`, it may contain
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79 any of the following variables in curly braces, e.g. `{pid}`.
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80
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81 `pid`
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82 : The PID of the current process
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83
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84 `count`
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85 : A counter that begins at 0 and increments for each dump made by
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86 the current process.
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87
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88 `time`
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89 : The unix timestamp at which the dump is made. It can be formatted
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90 to human-readable local time using `{time|yyyymmdd}` and `{time|hhmmss}`.
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91
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92 `paths`
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93 : Allows access to Prosody's known filesystem paths, use e.g. `{paths.data}`
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94 for the path to Prosody's data directory.
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95
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96 The filename does not have to be unique for every dump - if a file with the same
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97 name already exists, it will be appended to.
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98
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99 ## Integration with mod_debug_traceback
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100
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101 This module can be used in combination with [mod_debug_traceback] so that debug
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102 logs are dumped at the same time as the traceback. Use the following configuration:
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103
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104 ``` {.lua}
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105 log = {
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106 ---
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107 -- other optional logging config here --
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108 ---
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109
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110 {
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111 to = "ringbuffer";
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112 filename_template = "{paths.data}/traceback-{pid}-{count}.log";
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113 event = "debug_traceback/triggered";
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114 };
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115 }
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116 ```
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117
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118 If the filename template matches the traceback path, both logs and traceback will
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119 be combined into the same file. Of course separate files can be specified if preferred.
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120
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121 # Compatibility
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122
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123 0.12 and later.