Can Zap Logger\'s Log Level Be Altered Dynamically at Runtime?

Is it possible to change log level of a zap logger at runtime?

To manage logging levels dynamically in Zap logger, the AtomicLevel feature can be utilized. Here's how:

import (
    "go.uber.org/zap"
    "go.uber.org/zap/zapcore"
    "os"
)

func main() {
    // Set the underlying level to the default (DebugLevel)
    atom := zap.NewAtomicLevel()

    // Disable timestamps for deterministic logging
    encoderCfg := zap.NewProductionEncoderConfig()
    encoderCfg.TimeKey = ""

    // Create a logger with a JSON encoder and the atomic level
    logger := zap.New(zapcore.NewCore(
        zapcore.NewJSONEncoder(encoderCfg),
        zapcore.Lock(os.Stdout),
        atom,
    ))

    // Clean up resources when the program exits
    defer logger.Sync()

    // Log at the default level (DebugLevel)
    logger.Info("info logging enabled")

    // Change the atomic level to ErrorLevel
    atom.SetLevel(zapcore.ErrorLevel)

    // Log again, but at the new level (ErrorLevel)
    logger.Info("info logging disabled")
}

In this example, the atom variable represents the atomic level, which can be modified at runtime. By calling atom.SetLevel, the log level of the logger can be changed dynamically. This allows for run-time control over logging verbosity.

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