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annotate mod_log_json/README.markdown @ 5024:1cb762f72a91

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mod_isr: XEP-0397: Instant Stream Resumption
author Matthew Wild <mwild1@gmail.com>
date Sun, 28 Aug 2022 17:30:52 +0100
parents 4356088ad675
children
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1 ---
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2 summary: JSON Log Sink
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3 ---
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4
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5 Conifiguration
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6 ==============
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7
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8 Here we log to `/var/log/prosody/prosody.json`:
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9
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10 ``` {.lua}
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11 log = {
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12 -- your other log sinks
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13 info = "/var/log/prosody/prosody.log"
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14 -- add this:
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15 { to = "json", filename = "/var/log/prosody/prosody.json" };
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16 }
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17 ```
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18
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19 ## UDP
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20
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21 Alternatively, it can send logs via UDP:
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22
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23 ```lua
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24 log = {
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25 { to = "json", udp_host = "10.1.2.3", udp_port = "9999" };
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26 }
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27 ```
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28
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29 Format
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30 ======
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31
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32 JSON log files consist of a series of `\n`-separated JSON objects,
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33 suitable for mangling with tools like
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34 [`jq`](https://stedolan.github.io/jq/).
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35
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36 Example (with whitespace and indentation for readability):
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37
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38 ``` {.json}
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39 {
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40 "args" : [],
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41 "datetime" : "2019-11-03T13:38:28Z",
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42 "level" : "info",
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43 "message" : "Client connected",
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44 "source" : "c2s55f267f5b9d0"
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45 }
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46 {
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47 "args" : [
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48 "user@example.net"
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49 ],
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50 "datetime" : "2019-11-03T13:38:28Z",
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51 "level" : "debug",
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52 "message" : "load_roster: asked for: %s",
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53 "source" : "rostermanager"
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54 }
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55 ```
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56
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57 `datetime`
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58 : [XEP-0082]-formatted timestamp.
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59
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60 `source`
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61 : Log source, usually a module or a connected session.
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62
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63 `level`
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64 : `debug`, `info`, `warn` or `error`
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65
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66 `message`
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67 : The log message in `printf` format. Combine with `args` to get the
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68 final message.
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69
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70 `args`
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71 : Array of extra arguments, corresponding to `printf`-style `%s`
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72 formatting in the `message`.
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73
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74 Formatted message
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75 -----------------
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76
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77 If desired, at the obvious expense of performance, the formatted version of
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78 the string can be included in the JSON object by specifying the `formatted_as`
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79 key in the logger config:
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80
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81 ``` {.lua}
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82 log = {
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83 -- ... other sinks ...
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84 { to = "json", formatted_as = "msg_formatted", filename = "/var/log/prosody/prosody.json" };
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85 }
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86
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87 ```
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88
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89 This will expose the formatted message in the JSON as separate `msg_formatted`
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90 key. It is possible to override existing keys using this (for example, the
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91 `message` key), but not advisible.