A logger protocol that provides a common logging interface for different kinds of loggers. In addition, a class with a set of static functions for logging within your code is provided.
Kitura uses this API throughout its implementation when logging.
LoggerAPI package to the dependencies within your application’s
Package.swift file. Substitute
"x.x.x" with the latest
.package(url: "https://github.com/Kitura/LoggerAPI.git", from: "x.x.x")
LoggerAPI to your target’s dependencies:
.target(name: "example", dependencies: ["LoggerAPI"]),
Add log messages to your application:
Log.warning("This is a warning.") Log.error("This is an error.")
Define a logger
You need to define a
logger in order to output these messages. You may wish to write your own
Logger implementation, or you can use
HeliumLogger that writes to standard output:
import LoggerAPI import HeliumLogger let myLogger = HeliumLogger(.info) Log.logger = myLogger
You can find out more about HeliumLogger here.
Logging messages to swift-log
You can direct your log messages to be logged via swift-log by setting the
import LoggerAPI import Logging let myLogger = Logging.Logger(label: "myLogger") myLogger.logLevel = .notice Log.swiftLogger = myLogger
swiftLogger are set, then log messages will be sent to both logging backends. The log level configured for a LoggerAPI Logger and a swift-log Logger are independent, so may be used to log at different levels.
Note that because the hierarchy of log levels defined by LoggerAPI and swift-log is slightly different, a mapping is defined between the levels. See the documentation for
Log.isLogging() for details.
For more information visit our API reference.
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This library is licensed under Apache 2.0. Full license text is available in LICENSE.