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import * as net from "net";
import * as util from "util";
import { ArrayRedisToken } from "../resp/protocol/array-redis-token";
import { CommandSuite } from "../resp/processor/command-suite";
import { DefaultRequest } from "./default-request";
import { DefaultSession } from "./default-session";
import { EventEmitter } from "events";
import { IRequest } from "./request";
import { IRespCommand } from "../resp/command/resp-command";
import { Logger } from "../logger";
import { RedisTokenType } from "../resp/protocol/redis-token-type";
import { RespServerContext } from "./resp-server-context";
import { IServerContext } from "./server-context";
import { Session } from "./session";
import { UnknownRedisToken } from "../resp/protocol/unknown-redis-token";
export { sendCommand } from "../client";
/**
* The redis server.
* Manages client request/response cycle.
*
* Listens, by default, to env.DEFAULT_HOST (localhost) on port env.DEFAULT_PORT (6379)
*/
export class RespServer extends EventEmitter {
private static DEFAULT_HOST = process.env.REDIS_HOST || "localhost";
// eslint-disable-next-line no-magic-numbers
private static DEFAULT_PORT = process.env.REDIS_PORT || 6379;
private logger: Logger = new Logger(module.id);
private server: net.Server = net.createServer();
private serverContext: IServerContext;
constructor() {
super();
const host = RespServer.DEFAULT_HOST,
port = Number(RespServer.DEFAULT_PORT);
const commandSuite = new CommandSuite();
// Console.warn(`\tPORT is ${port}`);
this.serverContext = new RespServerContext(
host,
port,
commandSuite
);
}
/**
* Receive the client request, convert it to RESP format,
* dispatch the request then respond to the client.
*
* Probably too busy. Should be refactored.
*
* @param session The client session (including socket)
* @param message The client request
*/
public receive(session: Session, message: any): void {
// Convert message to RedisToken
const parser = new Parser({
"returnBuffers": false,
"returnError": (err: any) => {
this.logger.warn(
"returnError: \"%j\"",
err
);
},
"returnReply": async(command: any) => {
this.logger.debug(`returnReply: command is ${command}`);
session.setLastCommand(command);
const request: IRequest = this.parseMessage(
new ArrayRedisToken(command),
session
);
// Look up the command in commandsuite
const execcommand: IRespCommand = this.serverContext.getCommand(request.getCommand());
this.logger.debug(`Executing command "${request.getCommand()}"`);
const resultToken = await execcommand.execSync(request);
this.logger.debug(
`Response from "${request.getCommand()}, ${request.getParams()}" is %s`,
`${resultToken}`
);
// Send the result back to the client
session.publish(resultToken);
},
"stringNumbers": true
});
parser.execute(message);
}
/**
* Start the redis server
*/
public start(): void {
this.server.on(
"listening",
// eslint-disable-next-line @typescript-eslint/no-unused-vars
(listener: any) => {
this.server.on(
"connection",
(socket: net.Socket) => {
this.logger.debug("\n\nCONNECTION\n\n");
this.registerConnection(socket);
}
);
this.emit("ready");
this.logger.info(`redis-server: Listening on ${this.serverContext.getHost()}:${this.serverContext.getPort()}`);
}
);
this.server.listen(
this.serverContext.getPort(),
this.serverContext.getHost()
);
}
/**
* Stop the redis server
*/
public async stop() {
this.logger.info("redis-server: Shutting down");
await this.server.close();
this.emit("closed");
}
/**
* Register a client socket connection
* @param socket client socket
*/
private registerConnection(socket: net.Socket | any) {
// Generate the socketId
const key = `${socket.remoteAddress}:${socket.remotePort}`;
let newSession: Session | null = null;
Iif (socket.id) {
this.logger.debug(`FOUND SESSION: ${socket.id}`);
newSession = this.serverContext.getClients().get(socket.id);
} else {
socket.setKeepAlive(true);
newSession = new DefaultSession(
key,
socket
);
this.logger.info(`registering connection ${newSession.getId()}`);
newSession.putValue(
"ID",
newSession.getId()
);
socket.id = newSession.getId();
this.serverContext.addClient(
newSession.getId(),
newSession
);
}
socket.on(
"close",
(hadError: boolean) => {
this.logger.debug(`Closing socket ${socket.id}`);
this.serverContext.removeClient(socket.id);
this.logger.debug(`SOCKET CLOSE: ERROR ${hadError}`);
}
);
socket.on(
"data",
(chunk: any) => {
this.logger.debug(`Receive message from ${socket.id}`);
this.receive(
newSession as Session,
chunk
);
}
);
socket.on(
"connect",
() => {
this.logger.debug("THE SOCKET IS CONNECTED");
}
);
socket.on(
"drain",
() => {
this.logger.debug("SOCKET DRAIN");
}
);
socket.on(
"end",
() => {
this.logger.debug("SOCKET END");
}
);
socket.on(
"error",
() => {
this.logger.debug("SOCKET ERROR");
}
);
socket.on(
"ready",
() => {
this.logger.debug("SOCKET READY");
}
);
socket.on(
"timeout",
() => {
this.logger.debug("SOCKET TIMEOUT");
}
);
}
private parseMessage(message: ArrayRedisToken, session: Session): IRequest {
this.logger.debug(
`${session.getId()}: parseMessage `,
util.inspect(message)
);
switch (message.getType()) {
case RedisTokenType.ARRAY:
return this.parseArray(
message,
session
);
case RedisTokenType.UNKNOWN:
return this.parseLine(
message as any as UnknownRedisToken,
session
);
default:
this.logger.warn(`Found RedisTokenType: ${message.getType()}`);
return new DefaultRequest(
this.serverContext,
session,
message.toString(),
[]
);
}
}
private parseArray(message: ArrayRedisToken, session: Session): DefaultRequest {
this.logger.debug(`parseArray(${message}, ${session.getId()})`);
const params: string[] = this.toParams(message);
const command: string = params.shift() || "";
return new DefaultRequest(
this.serverContext,
session,
command,
params
);
}
private parseLine(message: UnknownRedisToken, session: Session): DefaultRequest {
const command: string = message.getValue(),
params: string[] = [];
for (const str of command.toString().split(" ")) {
params.push(str);
}
return new DefaultRequest(
this.serverContext,
session,
params[0].toString(),
params
);
}
private toParams(message: ArrayRedisToken): string[] {
return message.getValue();
}
}
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