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Added mdc from pull #2907

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gabime
2024-03-29 15:51:45 +03:00
parent a627f5c43a
commit 8815f81e5d
5 changed files with 203 additions and 21 deletions
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33
README.md
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@@ -138,23 +138,6 @@ void daily_example()
```
---
#### Backtrace support
```c++
// Debug messages can be stored in a ring buffer instead of being logged immediately.
// This is useful to display debug logs only when needed (e.g. when an error happens).
// When needed, call dump_backtrace() to dump them to your log.
spdlog::enable_backtrace(32); // Store the latest 32 messages in a buffer.
// or my_logger->enable_backtrace(32)..
for(int i = 0; i < 100; i++)
{
spdlog::debug("Backtrace message {}", i); // not logged yet..
}
// e.g. if some error happened:
spdlog::dump_backtrace(); // log them now! show the last 32 messages
// or my_logger->dump_backtrace(32)..
```
---
#### Periodic flush
@@ -207,6 +190,22 @@ void binary_example()
```
---
#### Mapped diagnostic context (MDC)
MDC is a map of contextual information that can be used to enrich log messages.
It is a map of key-value pairs that can be set on a per-thread basis since it is stored in thread-local storage.
```c++
#include "spdlog/spdlog.h"
#include "spdlog/mdc"
{
spdlog::mdc::put("key1", "value1");
spdlog::mdc::put("key2", "value2");
// use the %& formatter flag to print all MDC values
spdlog::set_pattern("[%H:%M:%S %z] [%^%L%$] [%&] %v");
spdlog::info("Some log message with context");
}
```
---
#### Logger with multi sinks - each with a different format and log level
```c++