Nick Payne
58 lines
1.9 KiB
Swift
58 lines
1.9 KiB
Swift
import Foundation
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/// Default logger implementation that writes JSON messages to stderr.
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/// This is the CLI-appropriate logger; library consumers can replace it
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/// via AudioTeeLogging.logger.
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public class StderrJSONLogger: AudioTeeLogger {
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private let dateFormatter: ISO8601DateFormatter = {
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let formatter = ISO8601DateFormatter()
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formatter.formatOptions = [
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.withInternetDateTime,
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.withFractionalSeconds,
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]
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return formatter
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}()
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private let jsonEncoder: JSONEncoder = {
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let encoder = JSONEncoder()
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return encoder
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}()
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public init() {
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// Configured in init because stored property initializers can't
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// reference other instance properties (self.dateFormatter).
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jsonEncoder.dateEncodingStrategy = .custom { [dateFormatter] date, encoder in
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var container = encoder.singleValueContainer()
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try container.encode(dateFormatter.string(from: date))
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}
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}
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// Write any message with the unified envelope to stderr
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public func writeMessage<T: Codable>(_ type: MessageType, data: T?) {
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let message = Message(type: type, data: data)
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do {
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let jsonData = try jsonEncoder.encode(message)
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FileHandle.standardError.write(jsonData)
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FileHandle.standardError.write("\n".data(using: .utf8)!)
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} catch {
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// TODO: handle at some point
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}
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}
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// Convenience methods for different message types
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public func info(_ message: String, context: [String: String]? = nil) {
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let logData = LogData(message: message, context: context)
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writeMessage(.info, data: logData)
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}
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public func error(_ message: String, context: [String: String]? = nil) {
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let logData = LogData(message: message, context: context)
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writeMessage(.error, data: logData)
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}
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public func debug(_ message: String, context: [String: String]? = nil) {
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let logData = LogData(message: message, context: context)
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writeMessage(.debug, data: logData)
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}
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}
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