stillyoungman / SLog

SLog

Base SLog project. SLog is a module-based logging system for Swift applications that allows writing both to Apple's OSLog and to other channels (e.g. file) without losing performance.

Getting started

Default setup flow.

Run following lines of code to configure logging system (it's better to configure logging as early as possible).

// Init and configure backends.
let fileBackend = ... 
let anotherBackend = ...
let backend = MultiplexLogBackend([fileBackend, anotherBackend])

// Provide backend factory method.
LoggingSystem.bootstrap { backend }

Usage

class Component { 
    let logger = Logger(source: "Component")
    
    func doAction() { 
        logger.debug("doAction() is going to be performed.")
        ...
        logger.info("doAction() is going to be finished.")
    }
}

Log templated message:

// let's assume that `err` variable defined in context
logger.error("Error happend in method doAction(). Description: %@", .s(err.localizedDescription))

Templated messages give ability to provide more detailed context to LogBackend. To use values in templated messages you should use TypeWrapper constructors:

.i(4) // integer
.ul(1000000000000000000) // unsigned long
.b(true) // boolean
.d(3.14) // double
.s("Hello") // string
.a(.s("Hello"), "world", 4, true) // array
.d(["key":.i(4)]) // dictionary

The method logger.debug("Message") is shorthand for logger.log(level: .debug, message: "Message") (for other levels same logic).