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Modified keys MUST be moved to the\n * beginning of the list.\n */\nexport class TraceStateImpl implements TraceState {\n private _internalState: Map<string, string> = new Map();\n\n constructor(rawTraceState?: string) {\n if (rawTraceState) this._parse(rawTraceState);\n }\n\n set(key: string, value: string): TraceStateImpl {\n // TODO: Benchmark the different approaches(map vs list) and\n // use the faster one.\n const traceState = this._clone();\n if (traceState._internalState.has(key)) {\n traceState._internalState.delete(key);\n }\n traceState._internalState.set(key, value);\n return traceState;\n }\n\n unset(key: string): TraceStateImpl {\n const traceState = this._clone();\n traceState._internalState.delete(key);\n return traceState;\n }\n\n get(key: string): string | undefined {\n return this._internalState.get(key);\n }\n\n serialize(): string {\n return this._keys()\n .reduce((agg: string[], key) => {\n agg.push(key + LIST_MEMBER_KEY_VALUE_SPLITTER + this.get(key));\n return agg;\n }, [])\n .join(LIST_MEMBERS_SEPARATOR);\n }\n\n private _parse(rawTraceState: string) {\n if (rawTraceState.length > MAX_TRACE_STATE_LEN) return;\n this._internalState = rawTraceState\n .split(LIST_MEMBERS_SEPARATOR)\n .reverse() // Store in reverse so new keys (.set(...)) will be placed at the beginning\n .reduce((agg: Map<string, string>, part: string) => {\n const listMember = part.trim(); // Optional Whitespace (OWS) handling\n const i = listMember.indexOf(LIST_MEMBER_KEY_VALUE_SPLITTER);\n if (i !== -1) {\n const key = listMember.slice(0, i);\n const value = listMember.slice(i + 1, part.length);\n if (validateKey(key) && validateValue(value)) {\n agg.set(key, value);\n } else {\n // TODO: Consider to add warning log\n }\n }\n return agg;\n }, new Map());\n\n // Because of the reverse() requirement, trunc must be done after map is created\n if (this._internalState.size > MAX_TRACE_STATE_ITEMS) {\n this._internalState = new Map(\n Array.from(this._internalState.entries())\n .reverse() // Use reverse same as original tracestate parse chain\n .slice(0, MAX_TRACE_STATE_ITEMS)\n );\n }\n }\n\n private _keys(): string[] {\n return Array.from(this._internalState.keys()).reverse();\n }\n\n private _clone(): TraceStateImpl {\n const traceState = new TraceStateImpl();\n traceState._internalState = new Map(this._internalState);\n return traceState;\n }\n}\n"]} |