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This package includes a set of :logger formatters designed to output logs in JSON format. It is compatible with a variety of log management systems that support JSON, including Google Cloud Logging and Error Reporting, Datadog, ElasticSearch, LogStash, FileBeat, and Kibana.
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lib/logger_json/formatter.ex
defmodule LoggerJSON.Formatter do
@type opts :: [
{:encoder_opts, encoder_opts()}
| {:metadata, :all | {:all_except, [atom()]} | [atom()]}
| {:redactors, [{module(), term()}]}
| {atom(), term()}
]
@type encoder_opts :: JSON.encoder() | [Jason.encode_opt()] | term()
@doc """
Creates a new configuration for the formatter.
"""
@callback new(opts) :: {module, term()}
@doc """
Formats a log event.
"""
@callback format(event :: :logger.log_event(), opts :: opts()) :: iodata()
@encoder Application.compile_env(:logger_json, :encoder, Jason)
@encoder_protocol Application.compile_env(:logger_json, :encoder_protocol) || Module.concat(@encoder, "Encoder")
@default_encoder_opts if(@encoder == JSON, do: &JSON.protocol_encode/2, else: [])
@doc false
@spec default_encoder_opts :: encoder_opts()
def default_encoder_opts, do: @default_encoder_opts
@doc false
@spec encoder :: module()
def encoder, do: @encoder
@doc false
@spec encoder_protocol :: module()
def encoder_protocol, do: @encoder_protocol
end