64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
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#include "quill/Backend.h"
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#include "quill/Frontend.h"
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#include "quill/LogMacros.h"
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#include "quill/Logger.h"
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#include "quill/sinks/ConsoleSink.h"
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#include "quill/sinks/JsonFileSink.h"
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#include <utility>
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/**
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* This example showcases the usage of the JsonFileSink to generate JSON-formatted logs.
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* Additionally, it demonstrates how to simultaneously log in both the standard logger output
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* format, e.g., to console and the corresponding JSON format to a JSON output sink.
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*
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* For successful JSON logging, it's essential to use named placeholders within the provided
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* format string, such as "{method}" and "{endpoint}".
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*/
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int main()
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{
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// Start the backend thread
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quill::BackendOptions backend_options;
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quill::Backend::start(backend_options);
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// Frontend
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// Create a json file for output
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auto json_sink = quill::Frontend::create_or_get_sink<quill::JsonFileSink>(
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"json_sink_logging.log",
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[]()
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{
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quill::JsonFileSinkConfig cfg;
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cfg.set_open_mode('w');
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cfg.set_filename_append_option(quill::FilenameAppendOption::StartDateTime);
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return cfg;
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}(),
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quill::FileEventNotifier{});
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// When using the JsonFileSink, it is ideal to set the logging pattern to empty to avoid unnecessary message formatting.
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quill::Logger* json_logger = quill::Frontend::create_or_get_logger(
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"json_logger", std::move(json_sink), "", "%H:%M:%S.%Qns", quill::Timezone::GmtTime);
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for (int i = 0; i < 2; ++i)
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{
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LOG_INFO(json_logger, "{method} to {endpoint} took {elapsed} ms", "POST", "http://", 10 * i);
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}
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// It is also possible to create a logger than logs to both the json file and stdout
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// with the appropriate format
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auto json_sink_2 = quill::Frontend::get_sink("json_sink_logging.log");
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auto console_sink = quill::Frontend::create_or_get_sink<quill::ConsoleSink>("console_sink_id_1");
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// We set a custom format pattern here to also include the named_args
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quill::Logger* hybrid_logger = quill::Frontend::create_or_get_logger(
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"hybrid_logger", {std::move(json_sink_2), std::move(console_sink)},
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"%(time) [%(thread_id)] %(short_source_location:<28) LOG_%(log_level:<9) %(logger:<20) "
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"%(message) [%(named_args)]");
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for (int i = 2; i < 4; ++i)
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{
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LOG_INFO(hybrid_logger, "{method} to {endpoint} took {elapsed} ms", "POST", "http://", 10 * i);
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}
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}
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