"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.readyHandler = exports.errorHandler = exports.closeHandler = exports.connectHandler = void 0;
const redis_errors_1 = require("redis-errors");
const Command_1 = require("../Command");
const errors_1 = require("../errors");
const utils_1 = require("../utils");
const version_1 = require("../utils/version");
const DataHandler_1 = require("../DataHandler");
const HimportCoordinator_1 = require("../himport/HimportCoordinator");
const debug = (0, utils_1.Debug)("connection");
function getHandshakeCommands(self) {
    const commands = [];
    if (self.condition.protocol === 3) {
        const helloCommandArgs = [self.condition.protocol];
        if (self.condition.auth) {
            helloCommandArgs.push("AUTH");
            if (Array.isArray(self.condition.auth)) {
                helloCommandArgs.push(self.condition.auth[0], self.condition.auth[1]);
            }
            else {
                helloCommandArgs.push("default", self.condition.auth);
            }
        }
        commands.push({
            kind: "hello",
            send: () => self.hello(helloCommandArgs),
            errorHandler: handleAuthError,
        });
    }
    else if (self.condition.auth) {
        commands.push({
            kind: "auth",
            send: () => self.auth(self.condition.auth),
            errorHandler: handleAuthError,
        });
    }
    if (self.condition.select) {
        commands.push({
            kind: "select",
            send: () => self.select(self.condition.select),
            errorHandler: (err) => self.silentEmit("error", err),
        });
    }
    if (self.options.connectionName) {
        debug("set the connection name [%s]", self.options.connectionName);
        commands.push({
            kind: "client",
            send: () => self.client("setname", self.options.connectionName),
            errorHandler: utils_1.noop,
        });
    }
    if (self.options.readOnly) {
        debug("set the connection to readonly mode");
        commands.push({
            kind: "readonly",
            send: () => self.readonly(),
            errorHandler: utils_1.noop,
        });
    }
    if (!self.options.disableClientInfo) {
        debug("set the client info");
        commands.push({
            kind: "client",
            send: () => self.client("SETINFO", "LIB-VER", version_1.PACKAGE_VERSION),
            errorHandler: utils_1.noop,
        });
        commands.push({
            kind: "client",
            send: () => self.client("SETINFO", "LIB-NAME", self.options?.clientInfoTag
                ? `ioredis(${self.options.clientInfoTag})`
                : "ioredis"),
            errorHandler: utils_1.noop,
        });
    }
    const himportBinding = (0, HimportCoordinator_1.getHimportBinding)(self);
    if (himportBinding && himportBinding.role !== "replica") {
        for (const definition of himportBinding.coordinator.getDefinitions()) {
            commands.push({
                kind: "himport",
                send: () => himportBinding.coordinator.ensurePrepared(self, definition) ??
                    Promise.resolve(),
                errorHandler: (err) => self.silentEmit("error", err),
            });
        }
    }
    return commands;
}
async function sendHandshake(commands, protocol) {
    if (protocol !== 3) {
        await Promise.all(commands.map(({ send, errorHandler }) => errorHandler ? send().catch(errorHandler) : send()));
        return;
    }
    // HELLO may carry AUTH. Send everything optimistically, then inspect
    // HELLO before surfacing setup errors.
    const results = await Promise.allSettled(commands.map(({ send }) => send()));
    const helloIndex = commands.findIndex(({ kind }) => kind === "hello");
    const helloResult = helloIndex === -1 ? undefined : results[helloIndex];
    if (helloResult?.status === "rejected" &&
        isProtocolNegotiationError(helloResult.reason)) {
        throw helloResult.reason;
    }
    for (let i = 0; i < results.length; i++) {
        const result = results[i];
        if (result.status === "rejected") {
            const { errorHandler } = commands[i];
            if (errorHandler) {
                errorHandler(result.reason);
                continue;
            }
            throw result.reason;
        }
    }
}
function connectHandler(self) {
    return async function () {
        try {
            self.resetCommandQueue();
            self.condition.handshake = true;
            self.setStatus("connect");
            /*
              No need to keep the reference of DataHandler here
              because we don't need to do the cleanup.
              `Stream#end()` will remove all listeners for us.
            */
            new DataHandler_1.default(self, {
                stringNumbers: self.options.stringNumbers,
                replyMapping: self.condition.replyMapping,
            });
            const { connectionEpoch } = self;
            const himportBinding = (0, HimportCoordinator_1.getHimportBinding)(self);
            himportBinding?.coordinator.beginSession(self);
            const isActiveConnect = () => connectionEpoch === self.connectionEpoch && self.status === "connect";
            const finishHandshake = () => {
                if (!isActiveConnect()) {
                    return false;
                }
                self.condition.handshake = false;
                return true;
            };
            try {
                await sendHandshake(getHandshakeCommands(self), self.condition.protocol);
            }
            catch (err) {
                // The connection may have been closed (and possibly already
                // reconnected) while the client setup commands above were still
                // in flight. In that case this callback is stale and the
                // connection is no longer the one we are setting up, so calling
                // readyHandler() would mark a dead connection as "ready" and
                // permanently stop reconnection. The enableReadyCheck branch
                // below is already guarded by the same connectionEpoch check.
                // See https://github.com/redis/ioredis/issues/2099
                if (!isActiveConnect()) {
                    return;
                }
                // Only an unsupported-RESP3 error is recoverable; everything else is fatal.
                if (!isProtocolNegotiationError(err)) {
                    return self.recoverFromFatalError(err, err);
                }
                // resp3 shapes are unavailable on RESP2, but the data is unaffected
                // (RESP2 never sends the remapped frames), so just warn — don't touch
                // the option.
                if (self.options.replyMapping === "resp3") {
                    console.warn('[WARN] replyMapping "resp3" was requested, but the server does not support RESP3. ' +
                        "Replies will use RESP2-compatible shapes until connected to a server that supports RESP3.");
                }
                debug("server rejected RESP3, downgrading connection to RESP2");
                self.condition.protocol = 2;
                self.condition.replyMapping = "legacy";
                try {
                    await sendHandshake(getHandshakeCommands(self), self.condition.protocol);
                }
                catch (downgradeErr) {
                    if (!isActiveConnect()) {
                        return;
                    }
                    return self.recoverFromFatalError(downgradeErr, downgradeErr);
                }
            }
            if (!isActiveConnect()) {
                return;
            }
            // Keep the public "connect" state/event while the internal handshake gate
            // stays closed. INFO is a handshake command so it's still writable here,
            // while a user SUBSCRIBE is not — it stays queued and can't race the
            // connection into subscriber mode before we're ready (which would get
            // INFO rejected).
            if (!self.options.enableReadyCheck) {
                if (!finishHandshake()) {
                    return;
                }
                return exports.readyHandler(self)();
            }
            self._readyCheck(function (err, info) {
                if (!isActiveConnect()) {
                    return;
                }
                if (err) {
                    self.recoverFromFatalError(err, err);
                }
                else if (self.connector.check(info)) {
                    if (!finishHandshake()) {
                        return;
                    }
                    exports.readyHandler(self)();
                }
                else {
                    self.disconnect(true);
                }
            });
        }
        catch (err) {
            self.recoverFromFatalError(err, err);
        }
    };
}
exports.connectHandler = connectHandler;
function handleAuthError(err) {
    const msg = err.message || "";
    if (msg.indexOf("no password is set") !== -1) {
        console.warn("[WARN] Redis server does not require a password, but a password was supplied.");
        return;
    }
    if (msg.indexOf("without any password configured for the default user") !== -1) {
        console.warn("[WARN] This Redis server's `default` user does not require a password, but a password was supplied");
        return;
    }
    if (msg.indexOf("wrong number of arguments for 'auth' command") !== -1) {
        console.warn(`[ERROR] The server returned "wrong number of arguments for 'auth' command". You are probably passing both username and password to Redis version 5 or below. You should only pass the 'password' option for Redis version 5 and under.`);
        return;
    }
    throw err;
}
// True when HELLO 3 failed because the server can't do RESP3: no HELLO at all
// (Redis < 6) or HELLO present but the version refused (NOPROTO).
function isProtocolNegotiationError(err) {
    const msg = (err.message || "").toUpperCase();
    return (msg.includes("NOPROTO") ||
        (msg.includes("UNKNOWN COMMAND") && msg.includes("HELLO")));
}
function abortError(command) {
    const err = new redis_errors_1.AbortError("Command aborted due to connection close");
    err.command = {
        name: command.name,
        args: command.args,
    };
    return err;
}
// If a contiguous set of pipeline commands starts from index zero then they
// can be safely reattempted. If however we have a chain of pipelined commands
// starting at index 1 or more it means we received a partial response before
// the connection close and those pipelined commands must be aborted. For
// example, if the queue looks like this: [2, 3, 4, 0, 1, 2] then after
// aborting and purging we'll have a queue that looks like this: [0, 1, 2]
function abortIncompletePipelines(commandQueue) {
    let expectedIndex = 0;
    for (let i = 0; i < commandQueue.length;) {
        const command = commandQueue.peekAt(i)?.command;
        const pipelineIndex = command.pipelineIndex;
        if (pipelineIndex === undefined || pipelineIndex === 0) {
            expectedIndex = 0;
        }
        if (pipelineIndex !== undefined && pipelineIndex !== expectedIndex++) {
            commandQueue.remove(i, 1);
            command.reject(abortError(command));
            continue;
        }
        i++;
    }
}
// If only a partial transaction result was received before connection close,
// we have to abort any transaction fragments that may have ended up in the
// offline queue
function abortTransactionFragments(commandQueue) {
    for (let i = 0; i < commandQueue.length;) {
        const command = commandQueue.peekAt(i)?.command;
        if (command.name === "multi") {
            break;
        }
        if (command.name === "exec") {
            commandQueue.remove(i, 1);
            command.reject(abortError(command));
            break;
        }
        if (command.inTransaction) {
            commandQueue.remove(i, 1);
            command.reject(abortError(command));
        }
        else {
            i++;
        }
    }
}
function closeHandler(self) {
    return function () {
        const prevStatus = self.status;
        self.setStatus("close");
        // The timeout belongs to the stream that just closed and must not survive reconnect.
        if (self.socketTimeoutTimer !== undefined) {
            clearTimeout(self.socketTimeoutTimer);
            self.socketTimeoutTimer = undefined;
        }
        if (self.commandQueue.length) {
            abortIncompletePipelines(self.commandQueue);
        }
        if (self.offlineQueue.length) {
            abortTransactionFragments(self.offlineQueue);
        }
        if (prevStatus === "ready") {
            if (!self.prevCondition) {
                self.prevCondition = self.condition;
            }
            if (self.commandQueue.length) {
                self.prevCommandQueue = self.commandQueue;
            }
        }
        if (self.manuallyClosing) {
            self.manuallyClosing = false;
            debug("skip reconnecting since the connection is manually closed.");
            return close();
        }
        if (typeof self.options.retryStrategy !== "function") {
            debug("skip reconnecting because `retryStrategy` is not a function");
            return close();
        }
        const retryDelay = self.options.retryStrategy(++self.retryAttempts);
        if (typeof retryDelay !== "number") {
            debug("skip reconnecting because `retryStrategy` doesn't return a number");
            return close();
        }
        debug("reconnect in %sms", retryDelay);
        self.setStatus("reconnecting", retryDelay);
        self.reconnectTimeout = setTimeout(function () {
            self.reconnectTimeout = null;
            self.connect().catch(utils_1.noop);
        }, retryDelay);
        const { maxRetriesPerRequest } = self.options;
        if (typeof maxRetriesPerRequest === "number") {
            if (maxRetriesPerRequest < 0) {
                debug("maxRetriesPerRequest is negative, ignoring...");
            }
            else {
                const remainder = self.retryAttempts % (maxRetriesPerRequest + 1);
                if (remainder === 0) {
                    debug("reach maxRetriesPerRequest limitation, flushing command queue...");
                    self.flushQueue(new errors_1.MaxRetriesPerRequestError(maxRetriesPerRequest));
                }
            }
        }
    };
    function close() {
        self.setStatus("end");
        self.flushQueue(new Error(utils_1.CONNECTION_CLOSED_ERROR_MSG));
    }
}
exports.closeHandler = closeHandler;
function errorHandler(self) {
    return function (error) {
        debug("error: %s", error);
        self.silentEmit("error", error);
    };
}
exports.errorHandler = errorHandler;
function readyHandler(self) {
    return function () {
        self.setStatus("ready");
        self.retryAttempts = 0;
        if (self.options.monitor) {
            self.call("monitor").then(() => self.setStatus("monitoring"), (error) => self.emit("error", error));
            const { sendCommand } = self;
            self.sendCommand = function (command) {
                if (Command_1.default.checkFlag("VALID_IN_MONITOR_MODE", command.name)) {
                    return sendCommand.call(self, command);
                }
                command.reject(new Error("Connection is in monitoring mode, can't process commands."));
                return command.promise;
            };
            self.once("close", function () {
                delete self.sendCommand;
            });
            return;
        }
        const finalSelect = self.prevCondition
            ? self.prevCondition.select
            : self.condition.select;
        if (self.prevCondition) {
            const condition = self.prevCondition;
            self.prevCondition = null;
            if (condition.subscriber && self.options.autoResubscribe) {
                // We re-select the previous db first since
                // `SELECT` command is not valid in sub mode.
                if (self.condition.select !== finalSelect) {
                    debug("connect to db [%d]", finalSelect);
                    self.select(finalSelect);
                }
                const subscribeChannels = condition.subscriber.channels("subscribe");
                if (subscribeChannels.length) {
                    debug("subscribe %d channels", subscribeChannels.length);
                    self.subscribe(subscribeChannels);
                }
                const psubscribeChannels = condition.subscriber.channels("psubscribe");
                if (psubscribeChannels.length) {
                    debug("psubscribe %d channels", psubscribeChannels.length);
                    self.psubscribe(psubscribeChannels);
                }
                const ssubscribeChannels = condition.subscriber.channels("ssubscribe");
                if (ssubscribeChannels.length) {
                    debug("ssubscribe %s", ssubscribeChannels.length);
                    for (const channel of ssubscribeChannels) {
                        self.ssubscribe(channel);
                    }
                }
            }
        }
        if (self.prevCommandQueue) {
            if (self.options.autoResendUnfulfilledCommands) {
                debug("resend %d unfulfilled commands", self.prevCommandQueue.length);
                while (self.prevCommandQueue.length > 0) {
                    const item = self.prevCommandQueue.shift();
                    if (item.select !== self.condition.select &&
                        item.command.name !== "select") {
                        self.select(item.select);
                    }
                    self.sendCommand(item.command, item.stream);
                }
            }
            else {
                self.prevCommandQueue = null;
            }
        }
        if (self.offlineQueue.length) {
            debug("send %d commands in offline queue", self.offlineQueue.length);
            const offlineQueue = self.offlineQueue;
            self.resetOfflineQueue();
            while (offlineQueue.length > 0) {
                const item = offlineQueue.shift();
                if (item.select !== self.condition.select &&
                    item.command.name !== "select") {
                    self.select(item.select);
                }
                self.sendCommand(item.command, item.stream);
            }
        }
        if (self.condition.select !== finalSelect) {
            debug("connect to db [%d]", finalSelect);
            self.select(finalSelect);
        }
    };
}
exports.readyHandler = readyHandler;