Created
November 29, 2020 16:12
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Logging for Swift (option 2)
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| import Foundation | |
| import os.log | |
| // MARK:- | |
| protocol LogHandler { | |
| func debug(_ msg: String, _ params: [String: Any]) | |
| func info(_ msg: String, _ params: [String: Any]) | |
| func error(_ msg: String, _ params: [String: Any]) | |
| func fatal(_ msg: String, _ params: [String: Any]) | |
| } | |
| // MARK:- | |
| struct Log { | |
| enum P { | |
| static let err = "error" | |
| static let fn = "fn" | |
| static let task = "task" | |
| static let latency = "latency" | |
| } | |
| static func error(_ msg: String, _ err: Error, _ params: [String: Any] = [:], _ fn: String = #function) { | |
| let newParams = [P.err: err, P.fn: fn].merging(params) { (p, _) in p } | |
| handler.error(msg, newParams) | |
| } | |
| static func debug(_ msg: String, _ params: [String: Any]) { | |
| handler.debug(msg, params) | |
| } | |
| static func info(_ msg: String, _ params: [String: Any]) { | |
| handler.info(msg, params) | |
| } | |
| static func fatal(_ msg: String, _ params: [String: Any]) { | |
| handler.fatal(msg, params) | |
| } | |
| // MARK: - | |
| static let app = Bundle.main.bundleIdentifier! | |
| static var handler = DefaultLogHandler(OSLog(subsystem: app, category: "app")) | |
| } | |
| // MARK:- | |
| final class DefaultLogHandler: LogHandler { | |
| init(_ log: OSLog) { | |
| self.log = log | |
| } | |
| func debug(_ msg: String, _ params: [String: Any]) { | |
| let s = format(msg: msg, with: params) | |
| os_log("%@", log: log, type: .debug, s) | |
| } | |
| func info(_ msg: String, _ params: [String: Any]) { | |
| let s = format(msg: msg, with: params) | |
| os_log("%@", log: log, type: .info, s) | |
| } | |
| func error(_ msg: String, _ params: [String: Any]) { | |
| let s = format(msg: msg, with: params) | |
| os_log("%@", log: log, type: .error, s) | |
| } | |
| func fatal(_ msg: String, _ params: [String: Any]) { | |
| let s = format(msg: msg, with: params) | |
| os_log("fatal: %@", log: log, type: .error, s) | |
| fatalError(s) | |
| } | |
| // MARK:- | |
| private func format(msg: String, with params: [String: Any]) -> String { | |
| return params.isEmpty ? msg : "\(msg); \(params)" | |
| } | |
| private let log: OSLog | |
| } |
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