ECS Logging backend for SwiftLog. Outputs log messages in ECS Log format.

• Features
• Installation
  • Swift Package Manager
• Usage
• How It Works
• Known Issues
• Author
• License
• Additional Software
  • Frameworks
  • Tools

• Compatible with SwiftLog
• Compatible with Vapor
• Support for custom events not defined as part of the ECS Log fields
• Supports additional key-value pairs which can be attached to and sent with every log event i.e. SwiftLog metadata
• Use ECS format logging in production falling back to regular logging format for development

• Include SwiftLog as a dependency as part of your projects’s Package.swift file. If using Vapor, you may skip this step as Vapor already includes SwiftLog as a dependency.
• Include swift-log-ecs as a dependency as part of your project’s Package.swift file.

• Import ECSLogging i.e. import ECSLogging
• Bootstrap the SwiftLog logging system as follows:

LoggingSystem.bootstrap { label in
    ECSLogHandler(label: label)
}

Note: The default log level is .info. You can set the log level as follows:

LoggingSystem.bootstrap { label in
    ECSLogHandler(label: label, logLevel: .notice)
}

If you wish to send your ECS formatted log messages somewhere other than the console, it’s possible to chain log handlers by passing in another LogHandler as follows:

let consoleLogger = ConsoleLogger(label: label, console: console, level: level)
return ECSLogHandler(label: label, logHandler: consoleLogger, logLevel: level)

This will cause the ECSLogHandler to format log messages according to the ECS Logging standard before forwarding the log messages on to the next LogHandler.

The default log handler included with SwiftLog is StreamLogHandler whilst the default LogHandler for Vapor is ConsoleLogger (from ConsoleKit) when you call the following bootstrapping code:

var env = try Environment.detect()
try LoggingSystem.bootstrap(from: &env)

To use ECSLogHandler instead, add the following extension to your Vapor project:

import Foundation
import Logging
import ECSLogging
import Vapor

extension LoggingSystem {
    public static func bootstrapECSLogging(from environment: inout Environment) throws {
        try self.bootstrap(from: &environment) { level in
            return { (label: String) in
                return ECSLogHandler(label: label, logLevel: level)
            }
        }
    }
}

Or if you prefer to use a combination of both:

import Foundation
import Logging
import ECSLogging
import ConsoleKit
import Vapor

extension LoggingSystem {
    public static func bootstrapECSLogging(from environment: inout Environment) throws {
        try self.bootstrap(from: &environment) { level in
            let console = Terminal()
            return { (label: String) in
                let consoleLogger = ConsoleLogger(label: label, console: console, level: level)
                return ECSLogHandler(label: label, logHandler: consoleLogger, logLevel: level)
            }
        }
    }
}

Then instead of calling the following in your main.swift:

var env = try Environment.detect()
try LoggingSystem.bootstrap(from: &env)

Instead call:

var env = try Environment.detect()
try LoggingSystem.bootstrapECSLogging(from: &env)

The SwiftLog package provides the Logger which clients should use. A LogHandler is a specific logging implementation e.g. to log to a file, to log to the console, to log to a monitoring solution such as Datadog or Sentry. swift-log-ecs provides the ECSLogHandler for logging messages in ECS Log format.

The Logger will pass log messages to the appropriate LogHandler, in this case, ECSLogHandler, if:

• The SwiftLog logging system has been bootstrapped to use the appropriate LogHandler i.e. ECSLogHandler (see Usage above).
• The message was logged at a log level higher than (or equal to) the current logging level set on the Logger.

See Issues.

Ross Butler

swift-log-ecs is available under the MIT license. See the LICENSE file for more info.

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