nest-leader-election/dist/src/entities/factory.js

Distributed leader election for NestJS

import { EntitySchema, Table } from "typeorm";
export const createLeaderLeaseEntity = (schema = "public") => {
    return new EntitySchema({
        name: "LeaderLease",
        tableName: "leader_lease",
        schema: schema,
        columns: {
            id: {
                type: "integer",
                primary: true,
                unique: true,
            },
            leaderId: {
                name: "leader_id",
                type: "text",
                nullable: false,
            },
            expiresAt: {
                name: "expires_at",
                type: "timestamptz",
                nullable: false,
            },
            createdAt: {
                name: "created_at",
                type: "timestamptz",
                default: () => "CURRENT_TIMESTAMP",
                nullable: false,
            },
        },
        checks: [
            {
                expression: `expires_at > created_at`,
            },
        ],
    });
};
export const createLeaderLeaseTable = (schema = "public") => {
    return new Table({
        schema: schema,
        name: `leader_lease`,
        columns: [
            {
                name: "id",
                type: "int",
                isPrimary: true,
                isUnique: true,
            },
            {
                name: "leader_id",
                type: "text",
                isNullable: false,
            },
            {
                name: "expires_at",
                type: "timestamptz",
                isNullable: false,
            },
            {
                name: "created_at",
                type: "timestamptz",
                isNullable: false,
                default: "NOW()",
            },
        ],
        checks: [
            {
                expression: "expires_at > created_at",
            },
        ],
    });
};