@azure/app-configuration/dist/commonjs/internal/syncTokenPolicy.js

An isomorphic client library for the Azure App Configuration service.

var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
var syncTokenPolicy_exports = {};
__export(syncTokenPolicy_exports, {
  SyncTokenHeaderName: () => SyncTokenHeaderName,
  SyncTokens: () => SyncTokens,
  parseSyncToken: () => parseSyncToken,
  syncTokenPolicy: () => syncTokenPolicy
});
module.exports = __toCommonJS(syncTokenPolicy_exports);
var import_logger = require("../logger.js");
const SyncTokenHeaderName = "sync-token";
function syncTokenPolicy(syncTokens) {
  return {
    name: "Sync Token Policy",
    async sendRequest(request, next) {
      const syncTokenHeaderValue = syncTokens.getSyncTokenHeaderValue();
      if (syncTokenHeaderValue) {
        import_logger.logger.info(
          `[syncTokenPolicy] Setting headers with ${SyncTokenHeaderName} and ${syncTokenHeaderValue}`
        );
        request.headers.set(SyncTokenHeaderName, syncTokenHeaderValue);
      }
      const response = await next(request);
      syncTokens.addSyncTokenFromHeaderValue(response.headers.get(SyncTokenHeaderName));
      return response;
    }
  };
}
class SyncTokens {
  _currentSyncTokens = /* @__PURE__ */ new Map();
  /**
   * Takes the value from the header named after the constant `SyncTokenHeaderName`
   * and adds it to our list of accumulated sync tokens.
   *
   * If given an empty value (or undefined) it clears the current list of sync tokens.
   * (indicates the service has properly absorbed values into the cluster).
   *
   * @param syncTokenHeaderValue - The full value of the sync token header.
   */
  addSyncTokenFromHeaderValue(syncTokenHeaderValue) {
    if (syncTokenHeaderValue == null || syncTokenHeaderValue === "") {
      this._currentSyncTokens.clear();
      return;
    }
    const newTokens = syncTokenHeaderValue.split(",").map(parseSyncToken);
    for (const newToken of newTokens) {
      const existingToken = this._currentSyncTokens.get(newToken.id);
      if (!existingToken || existingToken.sequenceNumber < newToken.sequenceNumber) {
        this._currentSyncTokens.set(newToken.id, newToken);
        continue;
      }
    }
  }
  /**
   * Gets a properly formatted SyncToken header value.
   */
  getSyncTokenHeaderValue() {
    if (this._currentSyncTokens.size === 0) {
      return void 0;
    }
    const syncTokenStrings = [];
    for (const syncToken of this._currentSyncTokens.values()) {
      syncTokenStrings.push(`${syncToken.id}=${syncToken.value}`);
    }
    return syncTokenStrings.join(",");
  }
}
const syncTokenRegex = /^([^=]+)=([^;]+);sn=(\d+)$/;
function parseSyncToken(syncToken) {
  const matches = syncToken.match(syncTokenRegex);
  if (matches == null) {
    throw new Error(
      `Failed to parse sync token '${syncToken}' with regex ${syncTokenRegex.source}`
    );
  }
  const sequenceNumber = parseInt(matches[3], 10);
  if (isNaN(sequenceNumber)) {
    throw new Error(`${syncToken}: The sequence number value '${matches[3]}' wasn't a number`);
  }
  return {
    id: matches[1],
    value: matches[2],
    sequenceNumber
  };
}
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  SyncTokenHeaderName,
  SyncTokens,
  parseSyncToken,
  syncTokenPolicy
});
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