@opentelemetry/core/dist/trace/TraceState.cjs

OpenTelemetry Core provides constants and utilities shared by all OpenTelemetry SDK packages.

const require_validators = require("../internal/validators.cjs");
//#region src/trace/TraceState.ts
const MAX_TRACE_STATE_ITEMS = 32;
const MAX_TRACE_STATE_LEN = 512;
const LIST_MEMBERS_SEPARATOR = ",";
const LIST_MEMBER_KEY_VALUE_SPLITTER = "=";
/**
* TraceState must be a class and not a simple object type because of the spec
* requirement (https://www.w3.org/TR/trace-context/#tracestate-field).
*
* Here is the list of allowed mutations:
* - New key-value pair should be added into the beginning of the list
* - The value of any key can be updated. Modified keys MUST be moved to the
* beginning of the list.
*/
var TraceState = class TraceState {
	_length;
	_rawTraceState;
	_internalState;
	constructor(rawTraceState) {
		this._rawTraceState = typeof rawTraceState === "string" ? rawTraceState : "";
		this._length = this._rawTraceState.length;
	}
	set(key, value) {
		if (!require_validators.validateKey(key) || !require_validators.validateValue(value)) return this;
		const currState = this._getState();
		const currValue = currState.get(key);
		let newLength = this._length;
		if (typeof currValue === "string") newLength += value.length - currValue.length;
		else {
			if (currState.size >= MAX_TRACE_STATE_ITEMS) return this;
			newLength += key.length + value.length + (currState.size > 0 ? 2 : 1);
		}
		if (newLength > MAX_TRACE_STATE_LEN) return this;
		const newState = new Map(currState);
		newState.delete(key);
		newState.set(key, value);
		return this._fromState(newState, newLength);
	}
	unset(key) {
		const currState = this._getState();
		const currValue = currState.get(key);
		if (typeof currValue !== "string") return this;
		let newLength = this._length - (key.length + currValue.length + 1);
		if (currState.size > 1) newLength = newLength - 1;
		const newState = new Map(currState);
		newState.delete(key);
		return this._fromState(newState, newLength);
	}
	get(key) {
		return this._getState().get(key);
	}
	serialize() {
		let serialized = "";
		let index = 0;
		for (const entry of this._getState()) {
			if (index > 0) serialized = LIST_MEMBERS_SEPARATOR + serialized;
			serialized = `${entry[0]}${LIST_MEMBER_KEY_VALUE_SPLITTER}${entry[1]}` + serialized;
			index++;
		}
		return serialized;
	}
	_getState() {
		if (this._internalState) return this._internalState;
		const vendorMembers = this._rawTraceState.split(LIST_MEMBERS_SEPARATOR);
		const vendorEntries = /* @__PURE__ */ new Map();
		let currentLength = 0;
		for (const member of vendorMembers) {
			const m = member.trim();
			const idx = m.indexOf(LIST_MEMBER_KEY_VALUE_SPLITTER);
			if (idx === -1) continue;
			const key = m.slice(0, idx);
			const value = m.slice(idx + 1);
			if (!require_validators.validateKey(key) || !require_validators.validateValue(value)) continue;
			const futureLength = currentLength + m.length + (vendorEntries.size > 0 ? 1 : 0);
			if (futureLength > MAX_TRACE_STATE_LEN) continue;
			vendorEntries.set(key, value);
			currentLength = futureLength;
			if (vendorEntries.size >= MAX_TRACE_STATE_ITEMS) break;
		}
		this._length = currentLength;
		this._internalState = new Map(Array.from(vendorEntries.entries()).reverse());
		return this._internalState;
	}
	_fromState(state, length) {
		const traceState = Object.create(TraceState.prototype);
		traceState._internalState = state;
		traceState._length = length;
		return traceState;
	}
};
//#endregion
exports.TraceState = TraceState;

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