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T. R. Bernstein 3b0bf5d595 Initial implementation 2026-02-27 22:18:00 +01:00
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.spi.yml
-4
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@@ -1,4 +0,0 @@
version: 1
builder:
configs:
- documentation_targets: [LoggingOSLog]
LICENSE
-287
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@@ -1,287 +0,0 @@
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Package.resolved
+1 -1
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@@ -1,5 +1,5 @@
{
"originHash" : "f8d66a42058d929bf19765cdba6aab75dff1936c233f6720005ce9dbcc464772",
"originHash" : "041d5a9b2664fe8fba9d0ff5826e7f1955cca0b22d288fe2f2383df27258b52a",
"pins" : [
{
"identity" : "swift-log",
README.md
-50
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@@ -1,50 +0,0 @@
# SwiftLog OSLog
A OSLog ([unified logging][unfied-logging]) [backend implementation][backend] for [SwiftLog (swift-log)][swift-log].
It maps the `label` parameter of [SwiftLog (swift-log) to the `subsystem` and
`category` parameter of `OSLog`. It even allows the use of the bundle
identifier - if any as a value for the `subsystem` parameter.
[unified-logging]: https://developer.apple.com/documentation/os/logging
[backend]: https://swiftpackageindex.com/apple/swift-log/1.10.1/documentation/logging
[swift-log]: https://github.com/apple/swift-log
## Installation
To use this library in your project, add it to the package dependencies:
```swift
.package(url: "https://github.com/astzweig/swift-log-oslog", from: "1.0.0")
```
and add it as a dependency on the specific target:
```swift
.target(
name: "YourTarget",
dependencies: [
.product(name: "LoggingOSLog", package: "swift-log-oslog")
]
)
```
### Basic Usage
```swift
// Import the logging API and this backend implementation
import Logging
#if canImport(Darwin)
import LoggingOSLog
#endif
// Later, in your application initialization code
func init() {
// ...
#if canImport(Darwin)
LoggingSystem.bootstrap(LoggingOSLog.init)
#endif
// Start creating loggers
let loggers: [String: Logger] = [
"main": Logger(label: "com.example.yourapp.Main"),
"mail": Logger(label: "com.example.yourapp.Mail System"),
]
}
```
Sources/Logging OSLog/Docs.docc/index.md
-103
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@@ -1,103 +0,0 @@
# ``LoggingOSLog``
An unified logging backend implementation for SwiftLog.
## Overview
LoggingOSLog is a logging backend implementation for [SwiftLog][swift-log], that
routes log messages to [OSLog][oslog], the
[unified logging system][unified-logging] on Apple platforms. On macOS you can
view the log messages using the Console app or the `log` cli tool.
While SwiftLog is available on all Swift platforms though, the
unified logging system of OSLog is only available on Apple platforms.
Use this library to combine both worlds. Use SwiftLog in your codebase and use
this library as the backend implementation when compiling for an Apple platform,
i.e. using `#if canImport(Darwin)`.
[unified-logging]: https://developer.apple.com/documentation/os/logging
[oslog]: https://developer.apple.com/documentation/oslog
[backend]: https://swiftpackageindex.com/apple/swift-log/1.10.1/documentation/logging
[swift-log]: https://github.com/apple/swift-log
## Getting started
Use this package if you're writing a cross-platform (for example, Linux and
macOS) application or library and still want to take full advantage of the
unified logging system on Apple platforms.
### Adding the Dependency
Add the dependency to your Package.swift:
```swift
.package(url: "https://github.com/astzweig/swift-log-oslog", from: "1.0.0")
```
And to your target:
```swift
.target(
name: "YourTarget",
dependencies: [
.product(name: "LoggingOSLog", package: "swift-log-oslog")
]
)
```
### Basic Usage
```swift
// Import the logging API and this backend implementation
import Logging
#if canImport(Darwin)
import LoggingOSLog
#endif
// Later, in your application initialization code
func init() {
// ...
#if canImport(Darwin)
LoggingSystem.bootstrap(LoggingOSLog.init)
#endif
// Start creating loggers
let loggers: [String: Logger] = [
"main": Logger(label: "com.example.yourapp.Main"),
"mail": Logger(label: "com.example.yourapp.Mail System"),
]
// And using loggers
logger["main"]!.debug("Starting build",
metadata: [
"input.output_directory": "\(output)",
"input.data": "\(data ?? "-")"
])
}
```
## Relation to the unified logging system
The [unified logging system][unified-logging] uses two parameters to allow for
better filtering of log messages: [subsystem][subsystem] and
[category][category]. [SwiftLog][swift-log] has only a label parameter, so this
library maps a reverse domain style label to the subsystem and category
parameters of the unified logging system. See
``/LoggingOSLog/LoggingOSLog/init(label:)`` for more information.
Metadata is appended as JSON to the logged message after a simple unicode right
arrow ("→").
### What this library does not supply
This library does not implement any of the interpolation privacy features of
the unified logging system, i.e. there is no way to redact or align a meta
information, like the `Logging` API would allow.
[subsystem]: https://developer.apple.com/documentation/os/generating-log-messages-from-your-code#:~:text=The%20subsystem%20string,for%20each%20subsystem%20string.
[category]: https://developer.apple.com/documentation/os/generating-log-messages-from-your-code#:~:text=The%20category%20string,for%20these%20strings.
## Topics
### API
- ``LoggingOSLog``
Sources/Logging OSLog/Logger Metadata Extension.swift
-41
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@@ -1,41 +0,0 @@
import Logging
extension Logging.Logger.Metadata {
public func asJSON() -> String {
return Self.asJSON(self)
}
private static func asJSON(_ metadata: Logging.Logger.Metadata) -> String {
var outputParts: [String: String] = [:]
for (key, value) in metadata {
let jsonKey = Self.escapeForJSON(key)
outputParts[jsonKey] = Self.asJSON(value)
}
return "{" + outputParts.map { "\"\($0)\": \($1)" }.joined(separator: ", ") + "}"
}
private static func asJSON(_ metadata: [Logging.Logger.MetadataValue]) -> String {
var outputParts: [String] = []
for item in metadata {
outputParts.append(Self.asJSON(item))
}
return "[" + outputParts.joined(separator: ", ") + "]"
}
private static func asJSON(_ metadata: Logging.Logger.MetadataValue) -> String {
switch metadata {
case .dictionary(let subvalues):
return Self.asJSON(subvalues)
case .array(let subvalues):
return Self.asJSON(subvalues)
case .string(let subvalue):
return "\"" + Self.escapeForJSON(subvalue) + "\""
case .stringConvertible(let subvalue):
return "\"" + Self.escapeForJSON("\(subvalue)") + "\""
}
}
private static func escapeForJSON(_ data: String) -> String {
return data.replacingOccurrences(of: "\"", with: "\\\"")
}
}
Sources/Logging OSLog/Logging OSLog.swift
+10 -43
View File
@@ -8,22 +8,6 @@ public struct LoggingOSLog: LogHandler {
public var metadataProvider: Logging.Logger.MetadataProvider?
private let oslogger: os.Logger
/**
Initializer that may be passed directly to
[LoggingSystem.bootstrap](https://swiftpackageindex.com/apple/swift-log/1.10.1/documentation/logging/loggingsystem/bootstrap(_:)).
- Parameter label: Example: com.example.sometool.MailProcessing
A reverse domain style identifier. The part up until the
last dot is used as the subsystem and the part after the
last dot is used as the category of the unified logging
message.
After the last dot spaces may be used to separate words.
If you want to use the application bundle identifier as the
subsystem, use a value without any dot and the whole value
will be mapped as the category of the unified logging system and
the subsystem is either the bundle identifier - if any - or
the string "SwiftLogToOsLog".
*/
public init(label: String) {
let lastDotPosition = label.lastIndex(of: ".") ?? label.startIndex
let frontPart = label.prefix(upTo: lastDotPosition)
@@ -36,16 +20,6 @@ public struct LoggingOSLog: LogHandler {
self.init(subsystem: String(frontPart), category: String(backPart))
}
/**
This Initializer may not be passed directly to
[LoggingSystem.bootstrap](https://swiftpackageindex.com/apple/swift-log/1.10.1/documentation/logging/loggingsystem/bootstrap(_:)).
It must be wrapped beforehand, but allows for direct assignment of subsystem and
category parameters of [OSLog](https://developer.apple.com/documentation/oslog).
- Parameters:
- subsystem: See the [Apple documentation](https://developer.apple.com/documentation/os/generating-log-messages-from-your-code#:~:text=The%20subsystem%20string,for%20each%20subsystem%20string.) for this parameter.
- category: See the [Apple documentation](https://developer.apple.com/documentation/os/generating-log-messages-from-your-code#:~:text=The%20category%20string,for%20these%20strings.) for this parameter.
*/
public init(
subsystem: String = Bundle.main.bundleIdentifier ?? "SwiftLogToOsLog",
category: String,
@@ -55,20 +29,11 @@ public struct LoggingOSLog: LogHandler {
self.logLevel = logLevel
}
/**
This Initializer may not be passed directly to
[LoggingSystem.bootstrap](https://swiftpackageindex.com/apple/swift-log/1.10.1/documentation/logging/loggingsystem/bootstrap(_:)).
Use it, when you've already a fully configured [os.Logger](https://developer.apple.com/documentation/os/logging)
instance.
*/
public init(oslog: os.Logger, logLevel: Logging.Logger.Level = .debug) {
self.oslogger = oslog
self.logLevel = logLevel
}
/**
This function is called by [SwiftLog](https://github.com/apple/swift-log).
*/
public func log(
level: Logging.Logger.Level,
message: Logging.Logger.Message,
@@ -78,16 +43,13 @@ public struct LoggingOSLog: LogHandler {
function: String,
line: UInt
) {
let metadataCSV = Self.joinedMetadata(self.metadata, self.metadataProvider?.get(), metadata)
let metadataCSV = Self.joinMetadata(self.metadata, self.metadataProvider?.get(), metadata)
let messageParts = [message.description, metadataCSV]
let message = messageParts.compactMap { $0 }.joined(separator: " → ")
self.oslogger.log(level: OSLogType.from(loggerLevel: level), "\(message, privacy: .public)")
let message = messageParts.compactMap { $0 }.joined(separator: " -> ")
self.oslogger.log(level: OSLogType.from(loggerLevel: level), "\(message)")
}
/**
Use subscripts on struct instances, to add metadata for all future log messages.
*/
public subscript(metadataKey metadataKey: String) -> Logging.Logger.Metadata.Value? {
get {
return self.metadata[metadataKey]
@@ -97,12 +59,17 @@ public struct LoggingOSLog: LogHandler {
}
}
private static func joinedMetadata(_ metadataList: Logging.Logger.Metadata?...) -> String? {
private static func joinMetadata(_ metadataList: Logging.Logger.Metadata?...) -> String? {
var metadataAggregator: Logging.Logger.Metadata = [:]
for metadata in metadataList {
guard let metadata = metadata else { continue }
metadataAggregator.merge(metadata) { return $1 }
}
return metadataAggregator.asJSON()
return Self.joinMetadata(metadataAggregator)
}
private static func joinMetadata(_ metadata: Logging.Logger.Metadata, with separator: String = ", ") -> String? {
guard !metadata.isEmpty else { return nil }
return metadata.map { "\($0) = \($1)" }.joined(separator: separator)
}
}
Tests/Logging OSLog Tests/Logging Test.swift
-12
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@@ -14,15 +14,3 @@ import LoggingOSLog
let logger = Logging.Logger(label: "de.astzweig.loggingoslog.Test")
logger.info("Test message")
}
@Test func canLogMessageWithMetadata() {
let logger = Logging.Logger(label: "de.astzweig.loggingoslog.Test")
logger.info("Test message", metadata: [
"request.id": "20140801",
"request.dirname": "\"Impossible\"",
"request.authorization": [
"bearer": "empty"
],
"request.values": ["1", "rootID", ["key": "value"]]
])
}