dockge/backend/agent-manager.ts

import { DockgeSocket } from "./util-server";
import { io, Socket as SocketClient } from "socket.io-client";
import { log } from "./log";
import { Agent } from "./models/agent";
import { LooseObject } from "../common/util-common";

/**
 * Dockge Instance Manager
 */
export class AgentManager {

    protected socket : DockgeSocket;
    protected instanceSocketList : Record<string, SocketClient> = {};

    constructor(socket: DockgeSocket) {
        this.socket = socket;
    }

    connect(url : string, username : string, password : string) {
        let obj = new URL(url);
        let endpoint = obj.host;

        this.socket.emit("agentStatus", {
            endpoint: endpoint,
            status: "connecting",
        });

        if (!endpoint) {
            log.error("agent-manager", "Invalid endpoint: " + endpoint + " URL: " + url);
            return;
        }

        if (this.instanceSocketList[endpoint]) {
            log.debug("agent-manager", "Already connected to the socket server: " + endpoint);
            return;
        }

        log.info("agent-manager", "Connecting to the socket server: " + endpoint);
        let client = io(url, {
            extraHeaders: {
                endpoint,
            }
        });

        client.on("connect", () => {
            log.info("agent-manager", "Connected to the socket server: " + endpoint);

            client.emit("login", {
                username: username,
                password: password,
            }, (res) => {
                if (res.ok) {
                    log.info("agent-manager", "Logged in to the socket server: " + endpoint);
                    this.socket.emit("agentStatus", {
                        endpoint: endpoint,
                        status: "online",
                    });
                } else {
                    log.error("agent-manager", "Failed to login to the socket server: " + endpoint);
                    this.socket.emit("agentStatus", {
                        endpoint: endpoint,
                        status: "offline",
                    });
                }
            });
        });

        client.on("error", (err) => {
            log.error("agent-manager", "Error from the socket server: " + endpoint);
            log.error("agent-manager", err);
            this.socket.emit("agentStatus", {
                endpoint: endpoint,
                status: "offline",
            });
        });

        client.on("disconnect", () => {
            log.info("agent-manager", "Disconnected from the socket server: " + endpoint);
            this.socket.emit("agentStatus", {
                endpoint: endpoint,
                status: "offline",
            });
        });

        client.on("agent", (...args : unknown[]) => {
            log.debug("agent-manager", "Forward event");
            this.socket.emit("agent", ...args);
        });

        this.instanceSocketList[endpoint] = client;
    }

    disconnect(endpoint : string) {
        let client = this.instanceSocketList[endpoint];
        client?.disconnect();
    }

    async connectAll() {
        if (this.socket.endpoint) {
            log.info("agent-manager", "This connection is connected as an agent, skip connectAll()");
            return;
        }

        let list : Record<string, Agent> = await Agent.getAgentList();

        if (Object.keys(list).length !== 0) {
            log.info("agent-manager", "Connecting to all instance socket server(s)...");
        }

        for (let endpoint in list) {
            let agent = list[endpoint];
            this.connect(agent.url, agent.username, agent.password);
        }
    }

    disconnectAll() {
        for (let endpoint in this.instanceSocketList) {
            this.disconnect(endpoint);
        }
    }

    emitToEndpoint(endpoint: string, eventName: string, ...args : unknown[]) {
        log.debug("agent-manager", "Emitting event to endpoint: " + endpoint);
        let client = this.instanceSocketList[endpoint];
        if (!client) {
            log.error("agent-manager", "Socket client not found for endpoint: " + endpoint);
            throw new Error("Socket client not found for endpoint: " + endpoint);
        }
        client?.emit("agent", endpoint, eventName, ...args);
    }

    emitToAllEndpoints(eventName: string, ...args : unknown[]) {
        log.debug("agent-manager", "Emitting event to all endpoints");
        for (let endpoint in this.instanceSocketList) {
            this.emitToEndpoint(endpoint, eventName, ...args);
        }
    }

    async sendAgentList() {
        let list = await Agent.getAgentList();
        let result : Record<string, LooseObject> = {};
        for (let endpoint in list) {
            let agent = list[endpoint];
            result[endpoint] = agent.toJSON();
        }
        this.socket.emit("agentList", {
            ok: true,
            agentList: result,
        });
    }
}