POC of restructuring commands

redis · Feb 15, 2024 · f576fe2 · f576fe2
1 parent cc85112
commit f576fe2
Show file tree

Hide file tree

Showing 6 changed files with 142 additions and 17 deletions.
diff --git a/packages/client/lib/RESP/types.ts b/packages/client/lib/RESP/types.ts
@@ -1,3 +1,4 @@
+import { CommandParser } from '../commander';
 import { BlobError, SimpleError } from '../errors';
 import { RedisScriptConfig, SHA1 } from '../lua-script';
 import { RESP_TYPES } from './decoder';
@@ -272,6 +273,7 @@ export type Command = {
    */
   IS_FORWARD_COMMAND?: boolean;
   // POLICIES?: CommandPolicies;
+  parseCommand?(this: void, parser: CommandParser, ...args: Array<any>): void;
   transformArguments(this: void, ...args: Array<any>): CommandArguments;
   TRANSFORM_LEGACY_REPLY?: boolean;
   transformReply: TransformReply | Record<RespVersions, TransformReply>;

diff --git a/packages/client/lib/client/index.ts b/packages/client/lib/client/index.ts
@@ -2,7 +2,7 @@ import COMMANDS from '../commands';
 import RedisSocket, { RedisSocketOptions } from './socket';
 import RedisCommandsQueue, { CommandOptions } from './commands-queue';
 import { EventEmitter } from 'node:events';
-import { attachConfig, functionArgumentsPrefix, getTransformReply, scriptArgumentsPrefix } from '../commander';
+import { BasicCommandParser, CachedCommandParser, CommandParser, attachConfig, functionArgumentsPrefix, getTransformReply, scriptArgumentsPrefix } from '../commander';
 import { ClientClosedError, ClientOfflineError, DisconnectsClientError, WatchError } from '../errors';
 import { URL } from 'node:url';
 import { TcpSocketConnectOpts } from 'node:net';
@@ -151,12 +151,19 @@ export default class RedisClient<
   static #createCommand(command: Command, resp: RespVersions) {
     const transformReply = getTransformReply(command, resp);
     return async function (this: ProxyClient, ...args: Array<unknown>) {
-      const redisArgs = command.transformArguments(...args),
-        reply = await this.sendCommand(redisArgs, this._commandOptions);
-      return transformReply ?
-        transformReply(reply, redisArgs.preserve) :
-        reply;
-    };
+      if (command.parseCommand) {
+        const parser = this._self.#newCommandParser();
+        command.parseCommand!(parser, ...args);
+
+        return this.executeCommand(undefined, parser, this._self._commandOptions);
+      } else {
+        const redisArgs = command.transformArguments(...args),
+          reply = await this.sendCommand(redisArgs, this._commandOptions);
+        return transformReply ?
+          transformReply(reply, redisArgs.preserve) :
+          reply;
+      };
+    }
   }
 
   static #createModuleCommand(command: Command, resp: RespVersions) {
@@ -308,6 +315,11 @@ export default class RedisClient<
     this._self.#dirtyWatch = msg;
   }
 
+  // FIXME: would choose parser here (i.e. if caching or not)
+  #newCommandParser(): CommandParser {
+    return new BasicCommandParser();
+  }
+
   constructor(options?: RedisClientOptions<M, F, S, RESP, TYPE_MAPPING>) {
     super();
     this.#options = this.#initiateOptions(options);
@@ -572,6 +584,25 @@ export default class RedisClient<
     return this as unknown as RedisClientType<M, F, S, RESP, TYPE_MAPPING>;
   }
 
+  async executeCommand<T = ReplyUnion>(
+    prefix: Array<string | Buffer> | undefined,
+    parser: CommandParser,
+    commandOptions: CommandOptions<TYPE_MAPPING> | undefined,
+  ) {
+    if (parser instanceof BasicCommandParser) {
+      let redisArgs = parser.redisArgs;
+      if (prefix) {
+        redisArgs = prefix.concat(redisArgs);
+      }
+
+      const reply = await this.sendCommand(redisArgs, commandOptions)
+
+      return parser.transformReply(reply);
+    } else if (parser instanceof CachedCommandParser) {
+      // TODO
+    }
+  }
+
   sendCommand<T = ReplyUnion>(
     args: Array<RedisArgument>,
     options?: CommandOptions

diff --git a/packages/client/lib/client/pool.ts b/packages/client/lib/client/pool.ts
@@ -4,7 +4,7 @@ import RedisClient, { RedisClientType, RedisClientOptions, RedisClientExtensions
 import { EventEmitter } from 'node:events';
 import { DoublyLinkedNode, DoublyLinkedList, SinglyLinkedList } from './linked-list';
 import { TimeoutError } from '../errors';
-import { attachConfig, functionArgumentsPrefix, getTransformReply, scriptArgumentsPrefix } from '../commander';
+import { BasicCommandParser, CommandParser, attachConfig, functionArgumentsPrefix, getTransformReply, scriptArgumentsPrefix } from '../commander';
 import { CommandOptions } from './commands-queue';
 import RedisClientMultiCommand, { RedisClientMultiCommandType } from './multi-command';
 
@@ -61,11 +61,18 @@ export class RedisClientPool<
   static #createCommand(command: Command, resp: RespVersions) {
     const transformReply = getTransformReply(command, resp);
     return async function (this: ProxyPool, ...args: Array<unknown>) {
-      const redisArgs = command.transformArguments(...args),
-        reply = await this.sendCommand(redisArgs, this._commandOptions);
-      return transformReply ?
-        transformReply(reply, redisArgs.preserve) :
-        reply;
+      if (command.parseCommand) {
+        const parser = this._self.#newCommandParser();
+        command.parseCommand(parser, ...args);
+
+        return this._self.execute(client => client.executeCommand(undefined, parser, this._commandOptions))
+      } else {
+        const redisArgs = command.transformArguments(...args),
+          reply = await this.sendCommand(redisArgs, this._commandOptions);
+        return transformReply ?
+          transformReply(reply, redisArgs.preserve) :
+          reply;
+      }
     };
   }
 
@@ -207,6 +214,11 @@ export class RedisClientPool<
     return this._self.#isClosing;
   }
 
+  // FIXME: would choose parser here (i.e. if caching or not)
+  #newCommandParser(): CommandParser {
+    return new BasicCommandParser();
+  }
+
   /**
    * You are probably looking for {@link RedisClient.createPool `RedisClient.createPool`},
    * {@link RedisClientPool.fromClient `RedisClientPool.fromClient`},

diff --git a/packages/client/lib/commander.ts b/packages/client/lib/commander.ts
@@ -1,4 +1,79 @@
-import { Command, CommanderConfig, RedisCommands, RedisFunction, RedisFunctions, RedisModules, RedisScript, RedisScripts, RespVersions } from './RESP/types';
+import { RedisArgument } from '..';
+import { Command, CommanderConfig, RedisCommands, RedisFunction, RedisFunctions, RedisModules, RedisScript, RedisScripts, RespVersions, TransformReply } from './RESP/types';
+
+export interface CommandParser {
+  push: (arg: RedisArgument) => unknown;
+  pushKey: (key: RedisArgument) => unknown;
+  setTransformReply: (transformReply: TransformReply) => unknown;
+  isParsed: () => boolean;
+  setCachable: () => unknown;
+}
+
+abstract class AbstractCommandParser implements CommandParser {
+  parsed: boolean = false;
+  redisArgs: Array<RedisArgument> = [];
+  transformReply: TransformReply = (reply) => { return reply }
+
+  push(arg: RedisArgument) {
+    this.parsed = true;
+    this.redisArgs.push(arg);
+
+  };
+  pushKey(key: RedisArgument) {
+    this.redisArgs.push(key);
+  };
+
+  setTransformReply(transformReply: TransformReply) {
+    this.transformReply = transformReply;
+  }
+
+  isParsed() {
+    return this.parsed;
+  }
+
+  setCachable() {};
+}
+
+export class BasicCommandParser extends AbstractCommandParser {};
+
+export class CachedCommandParser extends AbstractCommandParser {
+  keys: Array<RedisArgument> = [];
+  #cachable = false;
+  get cachable() {
+    return this.#cachable;
+  }
+
+  override pushKey(key: RedisArgument) {
+    this.keys.push(key)
+    super.pushKey(key);
+  }
+
+  override setCachable() {
+    this.#cachable = true;
+  }
+}
+
+export class ClusterCommandParser extends BasicCommandParser {
+  firstKey?: RedisArgument;
+
+  override pushKey(key: RedisArgument): void {
+    if (!this.firstKey) {
+      this.firstKey = key;
+    }
+    super.pushKey(key);
+  }
+}
+
+export class ClusterCachedCommandParser extends CachedCommandParser {
+  firstKey?: RedisArgument;
+
+  override pushKey(key: RedisArgument): void {
+    if (!this.firstKey) {
+      this.firstKey = key;
+    }
+    super.pushKey(key);
+  }
+}
 
 interface AttachConfigOptions<
   M extends RedisModules,

diff --git a/packages/client/lib/commands/GET.ts b/packages/client/lib/commands/GET.ts
@@ -1,10 +1,15 @@
 import { RedisArgument, BlobStringReply, NullReply, Command } from '../RESP/types';
+import { CommandParser } from '../commander';
 
 export default {
   FIRST_KEY_INDEX: 1,
   IS_READ_ONLY: true,
-  transformArguments(key: RedisArgument) {
-    return ['GET', key];
+  parseCommand(parser: CommandParser, key: RedisArgument) {
+    parser.setCachable();
+    parser.setTransformReply(undefined as unknown as () => BlobStringReply | NullReply)
+    parser.push('GET');
+    parser.pushKey(key);
   },
+  transformArguments: () => { return [] },
   transformReply: undefined as unknown as () => BlobStringReply | NullReply
 } as const satisfies Command;
diff --git a/packages/test-utils/lib/index.ts b/packages/test-utils/lib/index.ts
@@ -229,7 +229,7 @@ export default class TestUtils {
     it(title, async function () {
       if (!dockerPromise) return this.skip();
 
-      const pool = createClientPool({
+      const pool = u({
         ...options.clientOptions,
         socket: {
           ...options.clientOptions?.socket,