@daiso-tech/core/dist/circuit-breaker/implementations/adapters/redis-circuit-breaker-adapter/redis-circuit-breaker-adapter.js

The library offers flexible, framework-agnostic solutions for modern web applications, built on adaptable components that integrate seamlessly with popular frameworks like Next Js.

/**
 * @module CircuitBreaker
 */
import {} from "ioredis";
import { BACKOFFS, resolveBackoffSettingsEnum, serializeBackoffSettingsEnum, } from "../../../../backoff-policies/_module.js";
import { CIRCUIT_BREAKER_STATE, } from "../../../../circuit-breaker/contracts/_module.js";
import {} from "../../../../circuit-breaker/implementations/adapters/database-circuit-breaker-adapter/circuit-breaker-policy.js";
import { circuitBreakerFactoryLua } from "../../../../circuit-breaker/implementations/adapters/redis-circuit-breaker-adapter/lua/_module.js";
import { BREAKER_POLICIES, resolveCircuitBreakerPolicySettings, serializeCircuitBreakerPolicySettingsEnum, } from "../../../../circuit-breaker/implementations/policies/_module.js";
/**
 * IMPORT_PATH: `"@daiso-tech/core/circuit-breaker/redis-circuit-breaker-adapter"`
 * @group Adapters
 */
export class RedisCircuitBreakerAdapter {
    backoff;
    policy;
    database;
    /**
     * @example
     * ```ts
     * import { RedisCircuitBreakerAdapter } from "@daiso-tech/core/circuit-breaker/redis-circuit-breaker-adapter";
     * import Redis from "ioredis";
     *
     * const database = new Redis("YOUR_REDIS_CONNECTION_STRING");
     * const circuitBreakerAdapter = new RedisCircuitBreakerAdapter({
     *   database
     * });
     * ```
     */
    constructor(settings) {
        const { database, backoff = {
            type: BACKOFFS.EXPONENTIAL,
        }, policy = {
            type: BREAKER_POLICIES.CONSECUTIVE,
        }, } = settings;
        this.database = database;
        this.backoff = resolveBackoffSettingsEnum(backoff);
        this.policy = resolveCircuitBreakerPolicySettings(policy);
        this.initUpdateStateCommmand();
        this.initTrackFailureCommmand();
        this.initTrackSuccessCommmand();
    }
    initUpdateStateCommmand() {
        if (typeof this.database.daiso_circuit_breaker_update_state ===
            "function") {
            return;
        }
        this.database.defineCommand("daiso_circuit_breaker_update_state", {
            numberOfKeys: 1,
            lua: `
            ${circuitBreakerFactoryLua}

            local key = KEYS[1];
            local backoffSettings = cjson.decode(ARGV[1]);
            local policySettings = cjson.decode(ARGV[2]);
            local currentDate = tonumber(ARGV[3]);

            local circuitBreaker = circuitBreakerFactory(backoffSettings, policySettings, currentDate)
            local transition = circuitBreaker.updateState(key)
            return cjson.encode(transition)
            `,
        });
    }
    initTrackFailureCommmand() {
        if (typeof this.database.daiso_circuit_breaker_track_failure ===
            "function") {
            return;
        }
        this.database.defineCommand("daiso_circuit_breaker_track_failure", {
            numberOfKeys: 1,
            lua: `
            ${circuitBreakerFactoryLua}

            local key = KEYS[1];
            local backoffSettings = cjson.decode(ARGV[1]);
            local policySettings = cjson.decode(ARGV[2]);
            local currentDate = tonumber(ARGV[3]);

            local circuitBreaker = circuitBreakerFactory(backoffSettings, policySettings, currentDate)
            circuitBreaker.trackFailure(key)
            `,
        });
    }
    initTrackSuccessCommmand() {
        if (typeof this.database.daiso_circuit_breaker_track_success ===
            "function") {
            return;
        }
        this.database.defineCommand("daiso_circuit_breaker_track_success", {
            numberOfKeys: 1,
            lua: `
            ${circuitBreakerFactoryLua}

            local key = KEYS[1];
            local backoffSettings = cjson.decode(ARGV[1]);
            local policySettings = cjson.decode(ARGV[2]);
            local currentDate = tonumber(ARGV[3]);

            local circuitBreaker = circuitBreakerFactory(backoffSettings, policySettings, currentDate)
            circuitBreaker.trackSuccess(key)
            `,
        });
    }
    async getState(key) {
        const value = await this.database.get(key);
        if (value === null) {
            return CIRCUIT_BREAKER_STATE.CLOSED;
        }
        const state = JSON.parse(value);
        return state.type;
    }
    async updateState(key) {
        const value = await this.database.daiso_circuit_breaker_update_state(key, JSON.stringify(serializeBackoffSettingsEnum(this.backoff)), JSON.stringify(serializeCircuitBreakerPolicySettingsEnum(this.policy)), Date.now());
        return JSON.parse(value);
    }
    async isolate(key) {
        await this.database.set(key, JSON.stringify({
            type: CIRCUIT_BREAKER_STATE.ISOLATED,
        }));
    }
    async trackFailure(key) {
        await this.database.daiso_circuit_breaker_track_failure(key, JSON.stringify(serializeBackoffSettingsEnum(this.backoff)), JSON.stringify(serializeCircuitBreakerPolicySettingsEnum(this.policy)), Date.now());
    }
    async trackSuccess(key) {
        await this.database.daiso_circuit_breaker_track_success(key, JSON.stringify(serializeBackoffSettingsEnum(this.backoff)), JSON.stringify(serializeCircuitBreakerPolicySettingsEnum(this.policy)), Date.now());
    }
    async reset(key) {
        await this.database.del(key);
    }
}
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