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introduce level_cmp option; :exact means exact level match #84

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introduce level_cmp option; :exact means exact level match #84

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b019194
introduce level_cmp option; :exact means exact level match
dvv Aug 5, 2023
e855309
fix :warn warning
dvv Aug 9, 2024
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3 changes: 2 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -58,10 +58,11 @@ multiple log files.

* `path` - the path to the log file
* `level` - the logging level for the backend
* `level_cmp` - `nil` (default): treat level as the _minimum_ logging level for the backend; `:exact` treat level as the _exact_ logging level for the backend
* `format` - the logging format for the backend
* `metadata` - the metadata to include
* `metadata_filter` - metadata terms which must be present in order to log
* metadata_reject - metadata terms which must be present in order to do not log
* `metadata_reject` - metadata terms which must be present in order to do not log

### Examples

Expand Down
15 changes: 13 additions & 2 deletions lib/logger_file_backend.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -31,10 +31,14 @@ defmodule LoggerFileBackend do

def handle_event(
{level, _gl, {Logger, msg, ts, md}},
%{level: min_level, metadata_filter: metadata_filter, metadata_reject: metadata_reject} =
%{level: min_level, level_cmp: level_cmp, metadata_filter: metadata_filter, metadata_reject: metadata_reject} =
state
) do
if (is_nil(min_level) or Logger.compare_levels(level, min_level) != :lt) and
level = case level do
:warn -> :warning
_ -> level
end
if level_matches?(level, min_level, level_cmp) and
metadata_matches?(md, metadata_filter) and
(is_nil(metadata_reject) or !metadata_matches?(md, metadata_reject)) do
log_event(level, msg, ts, md, state)
Expand Down Expand Up @@ -149,6 +153,10 @@ defmodule LoggerFileBackend do
Logger.Formatter.format(format, level, msg, ts, take_metadata(md, keys))
end

defp level_matches?(_, nil, _), do: true
defp level_matches?(level, min_level, nil), do: Logger.compare_levels(level, min_level) != :lt
defp level_matches?(level, min_level, :exact), do: Logger.compare_levels(level, min_level) == :eq

@doc false
@spec metadata_matches?(Keyword.t(), nil | Keyword.t()) :: true | false
def metadata_matches?(_md, nil), do: true
Expand Down Expand Up @@ -206,6 +214,7 @@ defmodule LoggerFileBackend do
inode: nil,
format: nil,
level: nil,
level_cmp: nil,
metadata: nil,
metadata_filter: nil,
metadata_reject: nil,
Expand All @@ -221,6 +230,7 @@ defmodule LoggerFileBackend do
Application.put_env(:logger, name, opts)

level = Keyword.get(opts, :level)
level_cmp = Keyword.get(opts, :level_cmp)
metadata = Keyword.get(opts, :metadata, [])
format_opts = Keyword.get(opts, :format, @default_format)
format = Logger.Formatter.compile(format_opts)
Expand All @@ -235,6 +245,7 @@ defmodule LoggerFileBackend do
path: path,
format: format,
level: level,
level_cmp: level_cmp,
metadata: metadata,
metadata_filter: metadata_filter,
metadata_reject: metadata_reject,
Expand Down