import Foundationimport Logging#if canImport(Darwin)import Darwin#elseimport Glibc#endif struct JSONStderrLogHandler: LogHandler { var metadata: Logger.Metadata = [:] var logLevel: Logger.Level = .info private let label: String private let encoder: JSONEncoder init(label: String) { self.label = label self.encoder = JSONEncoder() self.encoder.dateEncodingStrategy = .iso8601 self.encoder.outputFormatting = [.sortedKeys] } subscript(metadataKey metadataKey: String) -> Logger.Metadata.Value? { get { self.metadata[metadataKey] } set { self.metadata[metadataKey] = newValue } } // swiftlint:disable:next function_parameter_count func log( level: Logger.Level, message: Logger.Message, metadata: Logger.Metadata?, source: String, file: String, function: String, line: UInt) { let ts = Date() var combined = self.metadata if let metadata { combined.merge(metadata, uniquingKeysWith: { _, new in new }) } let payload = JSONLogLine( timestamp: ts, level: level.rawValue, label: self.label, message: message.description, source: source, file: file, function: function, line: line, metadata: combined.isEmpty ? nil : combined.mapValues(\.description)) guard let data = try? self.encoder.encode(payload), let text = String(data: data, encoding: .utf8) else { return } Self.writeStderr(text + "\n") }} private struct JSONLogLine: Encodable { let timestamp: Date let level: String let label: String let message: String let source: String let file: String let function: String let line: UInt let metadata: [String: String]?} extension JSONStderrLogHandler { private static func writeStderr(_ text: String) { let bytes = Array(text.utf8) bytes.withUnsafeBytes { buffer in guard let baseAddress = buffer.baseAddress else { return } _ = write(STDERR_FILENO, baseAddress, buffer.count) } }}
import Foundation
import Logging
#if canImport(Darwin)
import Darwin
#else
import Glibc
#endif
struct JSONStderrLogHandler: LogHandler {
var metadata: Logger.Metadata = [:]
var logLevel: Logger.Level = .info
private let label: String
private let encoder: JSONEncoder
init(label: String) {
self.label = label
self.encoder = JSONEncoder()
self.encoder.dateEncodingStrategy = .iso8601
self.encoder.outputFormatting = [.sortedKeys]
}
subscript(metadataKey metadataKey: String) -> Logger.Metadata.Value? {
get { self.metadata[metadataKey] }
set { self.metadata[metadataKey] = newValue }
}
// swiftlint:disable:next function_parameter_count
func log(
level: Logger.Level,
message: Logger.Message,
metadata: Logger.Metadata?,
source: String,
file: String,
function: String,
line: UInt)
{
let ts = Date()
var combined = self.metadata
if let metadata { combined.merge(metadata, uniquingKeysWith: { _, new in new }) }
let payload = JSONLogLine(
timestamp: ts,
level: level.rawValue,
label: self.label,
message: message.description,
source: source,
file: file,
function: function,
line: line,
metadata: combined.isEmpty ? nil : combined.mapValues(\.description))
guard let data = try? self.encoder.encode(payload),
let text = String(data: data, encoding: .utf8) else { return }
Self.writeStderr(text + "\n")
}
}
private struct JSONLogLine: Encodable {
let timestamp: Date
let level: String
let label: String
let message: String
let source: String
let file: String
let function: String
let line: UInt
let metadata: [String: String]?
}
extension JSONStderrLogHandler {
private static func writeStderr(_ text: String) {
let bytes = Array(text.utf8)
bytes.withUnsafeBytes { buffer in
guard let baseAddress = buffer.baseAddress else { return }
_ = write(STDERR_FILENO, baseAddress, buffer.count)
}
}
}