Add more logging scopes to session IDs

This uses prefix chaining to correlate several scopes together.

src/crypto/OlmDevice.js

@@ -656,13 +656,14 @@ OlmDevice.prototype.getSessionIdsForDevice = async function(theirDeviceIdentityK
  * @param {boolean} nowait Don't wait for an in-progress session to complete.
  *     This should only be set to true of the calling function is the function
  *     that marked the session as being in-progress.
+ * @param {Logger} [log] A possibly customised log
  * @return {Promise<?string>}  session id, or null if no established session
  */
 OlmDevice.prototype.getSessionIdForDevice = async function(
-    theirDeviceIdentityKey, nowait,
+    theirDeviceIdentityKey, nowait, log,
 ) {
     const sessionInfos = await this.getSessionInfoForDevice(
-        theirDeviceIdentityKey, nowait,
+        theirDeviceIdentityKey, nowait, log,
     );
 
     if (sessionInfos.length === 0) {
@@ -702,10 +703,13 @@ OlmDevice.prototype.getSessionIdForDevice = async function(
  * @param {boolean} nowait Don't wait for an in-progress session to complete.
  *     This should only be set to true of the calling function is the function
  *     that marked the session as being in-progress.
+ * @param {Logger} [log] A possibly customised log
  * @return {Array.<{sessionId: string, hasReceivedMessage: Boolean}>}
  */
-OlmDevice.prototype.getSessionInfoForDevice = async function(deviceIdentityKey, nowait) {
-    const log = logger.withPrefix("[getSessionInfoForDevice]");
+OlmDevice.prototype.getSessionInfoForDevice = async function(
+    deviceIdentityKey, nowait, log = logger,
+) {
+    log = log.withPrefix("[getSessionInfoForDevice]");
 
     if (this._sessionsInProgress[deviceIdentityKey] && !nowait) {
         log.debug(`Waiting for Olm session for ${deviceIdentityKey} to be created`);

src/crypto/olmlib.js

@@ -183,7 +183,7 @@ export async function getExistingOlmSessions(
  * @param {Array} [failedServers] An array to fill with remote servers that
  *     failed to respond to one-time-key requests.
  *
- * @param {Object} [log] A possibly customised log
+ * @param {Logger} [log] A possibly customised log
  *
  * @return {Promise} resolves once the sessions are complete, to
  *    an Object mapping from userId to deviceId to
@@ -257,7 +257,7 @@ export async function ensureOlmSessionsForDevices(
                 );
             }
             const sessionId = await olmDevice.getSessionIdForDevice(
-                key, resolveSession[key],
+                key, resolveSession[key], log,
             );
             log.debug(`Got Olm session ${sessionId} ${forWhom}`);
             if (sessionId !== null && resolveSession[key]) {

src/crypto/store/indexeddb-crypto-store.js

@@ -596,7 +596,7 @@ export class IndexedDBCryptoStore {
      * @param {function(*)} func Function called with the
      *     transaction object: an opaque object that should be passed
      *     to store functions.
-     * @param {object} [log] A possibly customised log
+     * @param {Logger} [log] A possibly customised log
      * @return {Promise} Promise that resolves with the result of the `func`
      *     when the transaction is complete. If the backend is
      *     async (ie. the indexeddb backend) any of the callback

src/logger.ts

@@ -68,8 +68,9 @@ interface PrefixedLogger extends Logger {
 }
 
 function extendLogger(logger: PrefixedLogger) {
-    logger.withPrefix = function(prefix: string) {
-        return getPrefixedLogger(this.prefix + prefix);
+    logger.withPrefix = function(prefix: string): PrefixedLogger {
+        const existingPrefix = this.prefix || "";
+        return getPrefixedLogger(existingPrefix + prefix);
     };
 }