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