d22556d04e
Metadata shall be machine readable (see SwiftLog/Structured Logging) and the previous metadata serialization erased the nesting structure. The JSON output ensures that the metadata can be quickly analyzed by either a copy and paste into a JSON editor or a small CLI pipeline. See https://swiftpackageindex.com/apple/swift-log/1.10.1/documentation/logging/002-structuredlogging for more information on metadata.
42 lines
1.2 KiB
Swift
42 lines
1.2 KiB
Swift
import Logging
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extension Logging.Logger.Metadata {
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public func asJSON() -> String {
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return Self.asJSON(self)
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}
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private static func asJSON(_ metadata: Logging.Logger.Metadata) -> String {
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var outputParts: [String: String] = [:]
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for (key, value) in metadata {
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let jsonKey = Self.escapeForJSON(key)
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outputParts[jsonKey] = Self.asJSON(value)
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}
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return "{" + outputParts.map { "\"\($0)\": \($1)" }.joined(separator: ", ") + "}"
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}
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private static func asJSON(_ metadata: [Logging.Logger.MetadataValue]) -> String {
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var outputParts: [String] = []
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for item in metadata {
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outputParts.append(Self.asJSON(item))
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}
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return "[" + outputParts.joined(separator: ", ") + "]"
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}
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private static func asJSON(_ metadata: Logging.Logger.MetadataValue) -> String {
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switch metadata {
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case .dictionary(let subvalues):
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return Self.asJSON(subvalues)
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case .array(let subvalues):
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return Self.asJSON(subvalues)
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case .string(let subvalue):
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return "\"" + Self.escapeForJSON(subvalue) + "\""
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case .stringConvertible(let subvalue):
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return "\"" + Self.escapeForJSON("\(subvalue)") + "\""
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}
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}
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private static func escapeForJSON(_ data: String) -> String {
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return data.replacingOccurrences(of: "\"", with: "\\\"")
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}
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}
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