ref #2370 add support for CommandIterator in ScanIterator

Co-authored-by: Leibale Eidelman <me@leibale.com>

packages/client/lib/client/index.spec.ts

@@ -607,18 +607,19 @@ describe('Client', () => {
         return client.executeIsolated(isolated => killClient(isolated, client));
     }, GLOBAL.SERVERS.OPEN);
 
-    testUtils.testWithClient('scanIterator', async client => {
+    describe('scanIterator', () => {
-        const promises = [],
+        testUtils.testWithClient('strings', async client => {
-            keys = new Set();
+            const args: Array<string> = [],
+                keys = new Set<string>();
             for (let i = 0; i < 100; i++) {
                 const key = i.toString();
+                args.push(key, '');
                 keys.add(key);
-            promises.push(client.set(key, ''));
             }
 
-        await Promise.all(promises);
+            await client.mSet(args);
 
-        const results = new Set();
+            const results = new Set<string>();
             for await (const key of client.scanIterator()) {
                 results.add(key);
             }
@@ -626,6 +627,29 @@ describe('Client', () => {
             assert.deepEqual(keys, results);
         }, GLOBAL.SERVERS.OPEN);
 
+        testUtils.testWithClient('buffers', async client => {
+            const args: Array<string | Buffer> = [],
+                keys = new Set<Buffer>();
+            for (let i = 0; i < 100; i++) {
+                const key = Buffer.from([i]);
+                args.push(key, '');
+                keys.add(key);
+            }
+
+            await client.mSet(args);
+
+            const results = new Set<Buffer>(),
+                iteartor = client.scanIterator(
+                    client.commandOptions({ returnBuffers: true })
+                );
+            for await (const key of iteartor) {
+                results.add(key);
+            }
+
+            assert.deepEqual(keys, results);
+        }, GLOBAL.SERVERS.OPEN);
+    });
+
     testUtils.testWithClient('hScanIterator', async client => {
         const hash: Record<string, string> = {};
         for (let i = 0; i < 100; i++) {

packages/client/lib/client/index.ts

@@ -656,10 +656,29 @@ export default class RedisClient<
         return results;
     }
 
-    async* scanIterator(options?: ScanCommandOptions): AsyncIterable<string> {
+    scanIterator<T extends CommandOptions<ClientCommandOptions>>(
+        commandOptions: T,
+        options?: ScanCommandOptions
+    ): AsyncIterable<T['returnBuffers'] extends true ? Buffer : string>;
+    scanIterator(
+        options?: ScanCommandOptions
+    ): AsyncIterable<string>;
+    async* scanIterator<T extends CommandOptions<ClientCommandOptions>>(
+        commandOptions?: T | ScanCommandOptions,
+        options?: ScanCommandOptions
+    ): AsyncIterable<T['returnBuffers'] extends true ? Buffer : string> {
+        if (!isCommandOptions(commandOptions)) {
+            options = commandOptions;
+            commandOptions = undefined;
+        }
+
+        const scan = commandOptions ?
+            (...args: Array<unknown>) => (this as any).scan(commandOptions, ...args) :
+            (...args: Array<unknown>) => (this as any).scan(...args);
+
         let cursor = 0;
         do {
-            const reply = await (this as any).scan(cursor, options);
+            const reply = await scan(cursor, options);
             cursor = reply.cursor;
             for (const key of reply.keys) {
                 yield key;
@@ -726,3 +745,15 @@ attachCommands({
     executor: RedisClient.prototype.commandsExecutor
 });
 (RedisClient.prototype as any).Multi = RedisClientMultiCommand;
+
+const client = RedisClient.create();
+
+const a = client.scanIterator(
+    client.commandOptions({returnBuffers: true})
+)
+
+const b = client.scanIterator(
+    client.commandOptions({returnBuffers: false})
+)
+
+const c = client.scanIterator()

packages/test-utils/lib/dockers.ts

@@ -52,7 +52,7 @@ const DOCKER_FODLER_PATH = path.join(__dirname, '../docker');
 async function spawnRedisServerDocker({ image, version }: RedisServerDockerConfig, serverArguments: Array<string>): Promise<RedisServerDocker> {
     const port = (await portIterator.next()).value,
         { stdout, stderr } = await execAsync(
-            'docker run -d --network host $(' +
+            `docker run -d -p ${port}:${port} $(` +
                 `docker build ${DOCKER_FODLER_PATH} -q ` +
                 `--build-arg IMAGE=${image}:${version} ` +
                 `--build-arg REDIS_ARGUMENTS="--save '' --port ${port.toString()} ${serverArguments.join(' ')}"` +