view mod_log_json/README.markdown @ 5296:0f5657db1cfc

mod_isolate_host: handle server-generated stanzas The hook for setting the no_host_isolation is only called for c2s sessions. This does not work for stanzas generated by the server, such as PEP notifications or presence probe answers. To handle that, we do per-stanza checks for the case that the origin is local.
author Jonas Schäfer <jonas@wielicki.name>
date Sat, 01 Apr 2023 12:03:08 +0200
parents 4356088ad675
children
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---
summary: JSON Log Sink
---

Conifiguration
==============

Here we log to `/var/log/prosody/prosody.json`:

``` {.lua}
log = {
  -- your other log sinks
  info = "/var/log/prosody/prosody.log"
  -- add this:
  { to = "json", filename = "/var/log/prosody/prosody.json" };
}
```

## UDP

Alternatively, it can send logs via UDP:

```lua
log = {
  { to = "json", udp_host = "10.1.2.3", udp_port = "9999" };
}
```

Format
======

JSON log files consist of a series of `\n`-separated JSON objects,
suitable for mangling with tools like
[`jq`](https://stedolan.github.io/jq/).

Example (with whitespace and indentation for readability):

``` {.json}
{
   "args" : [],
   "datetime" : "2019-11-03T13:38:28Z",
   "level" : "info",
   "message" : "Client connected",
   "source" : "c2s55f267f5b9d0"
}
{
   "args" : [
      "user@example.net"
   ],
   "datetime" : "2019-11-03T13:38:28Z",
   "level" : "debug",
   "message" : "load_roster: asked for: %s",
   "source" : "rostermanager"
}
```

`datetime`
:   [XEP-0082]-formatted timestamp.

`source`
:   Log source, usually a module or a connected session.

`level`
:   `debug`, `info`, `warn` or `error`

`message`
:   The log message in `printf` format. Combine with `args` to get the
    final message.

`args`
:   Array of extra arguments, corresponding to `printf`-style `%s`
    formatting in the `message`.

Formatted message
-----------------

If desired, at the obvious expense of performance, the formatted version of
the string can be included in the JSON object by specifying the `formatted_as`
key in the logger config:

``` {.lua}
log = {
  -- ... other sinks ...
  { to = "json", formatted_as = "msg_formatted", filename = "/var/log/prosody/prosody.json" };
}

```

This will expose the formatted message in the JSON as separate `msg_formatted`
key. It is possible to override existing keys using this (for example, the
`message` key), but not advisible.