Running a Matrixchain Indexer

Prerequisites

Before you begin, ensure that you have installed Docker on a machine you will use to host the Indexer.

Quick Start

1. Begin by creating three files (docker-compose.yml, .env and init.sql):

version: "3.9"

services:  
  indexer_db:  
    container_name: indexer_db  
    image: postgres:16  
    restart: unless-stopped  
    environment:  
      POSTGRES_DB: ${DB_NAME}  
      POSTGRES_PASSWORD: ${DB_PASS}  
    volumes:  
      - ./init.sql:/docker-entrypoint-initdb.d/init.sql  
      - indexer_db:/var/lib/postgresql/data  
    ports:  
      - "5432:5432"  
    command: [  
      "postgres",  
      "-c", "max_connections=200"  
    ]

  indexer_redis:  
    container_name: indexer_redis  
    image: redis:7.0  
    restart: on-failure  
    volumes:  
      - redis_db:/data  
    ports:  
      - "6389:6379"

  indexer_processor:  
    container_name: indexer_processor  
    restart: unless-stopped  
    image: enjin/indexer-matrixchain:${VERSION:-latest}  
    environment:  
      CONTAINER_ROLE: processor  
    build:  
      context: .  
    volumes:  
      - .env:/squid/.env  
    depends_on:  
      - indexer_db  
      - indexer_worker

  indexer_graphql:  
    container_name: indexer_graphql  
    restart: unless-stopped  
    image: enjin/indexer-matrixchain:${VERSION:-latest}  
    environment:  
      CONTAINER_ROLE: graphql  
    build:  
      context: .  
    ports:  
      - "4000:4000"  
      - "8080:8080"  
    volumes:  
      - .env:/squid/.env  
    depends_on:  
      - indexer_db  
      - indexer_processor

  indexer_worker:  
    container_name: indexer_worker  
    restart: unless-stopped  
    image: enjin/indexer-matrixchain:${VERSION:-latest}  
    environment:  
      CONTAINER_ROLE: worker  
    build:  
      context: .  
    ports:  
      - "9090:9090"  
    volumes:  
      - .env:/squid/.env  
    depends_on:  
      - indexer_db  
      - indexer_redis

volumes:  
  indexer_db:  
  redis_db:

ARCHIVE_ENDPOINT: "<https://v2.archive.subsquid.io/network/enjin-matrix">  
CHAIN_ENDPOINT: "wss://archive.matrix.blockchain.enjin.io"  
CHAIN_PREFIX: "1110"  
DB_HOST: "indexer_db"  
DB_NAME: "indexer_enjin_matrix"  
DB_PORT: "5432"  
DB_PASS: postgres  
REDIS_URL: "redis://indexer_redis:6379/1"

CREATE SCHEMA IF NOT EXISTS metadata;  

CREATE TABLE IF NOT EXISTS "metadata"."metadata" (  
    id TEXT PRIMARY KEY,  
    metadata JSONB,  
    uri TEXT,  
    last_updated_at TIMESTAMP  
);

CREATE INDEX IF NOT EXISTS metadata_uri ON "metadata"."metadata" (uri);

2. Start the Indexer by running the following command: docker compose up -d
   The command will launch all the necessary services in the background.
3. Access the GraphQL API
   Once the services are up and running, you can access the GraphQL Playground of the Indexer by opening your web browser and navigating to: http://localhost:4000/graphql

You can read the GraphQL Documentation for more information about how to construct queries for the GraphQL interface.

Advanced Configuration

1. Clone and Enter the Repository

   git clone <https://github.com/enjin/indexer.git>  
   cd indexer
2. Configure Environment Variables
   In the repository, you will find a .env.example file that outlines the necessary environment variables for running the Enjin Matrixchain Indexer. Copy this file to create your own .env file: cp .env.example .env
   Then, open the .env file in a text editor and fill in the missing values. Below is an example of the environment variables and their purpose:

NODE_ENV=production # Node.js environment (supported values: development, production) 

## Required - Blockchain
CHAIN_ENDPOINT=wss://archive.matrix.blockchain.enjin.io # WebSocket endpoint to connect to the Enjin Matrixchain. It is recommended to be set to your Enjin Archive Node.  
CHAIN_PREFIX=1110 # The chain prefix for Enjin Matrixchain
ARCHIVE_ENDPOINT=<https://v2.archive.subsquid.io/network/enjin-matrix> # Subsquid archive endpoint for historical blockchain data

## Required - Database
DB_NAME=postgres # Name of your PostgreSQL database. If you  
DB_HOST=indexer_db # PostgreSQL host  
DB_PORT=5432 # PostgreSQL port  
DB_PASS=postgres # Postgres password  
REDIS_URL=redis://indexer_redis:6379/1 # Redis URL for caching

## Optional - Prometheus Monitoring
PROMETHEUS_PORT=7364 # Port for Prometheus metrics
PROCESSOR_PROMETHEUS_ENDPOINT=http://localhost:7364 # Prometheus endpoint for the processor

## Optional - Error Reporting and Debugging
SQD_DEBUG=INFO # Debugging flag for Subsquid. More info can be found <https://docs.sqd.dev/sdk/reference/logger/>  
SENTRY_DSN=your_sentry_dsn # Sentry DSN for error tracking

info

If you are using your own Redis or PostgresSQL instances (instead of the ones provided by Docker Compose), remember to remove the indexer_db and indexer_redis services from the docker-compose.yml, and set the database connection details (like DB_HOST, DB_PORT and REDIS_URL) in the .env file to match your external services.

Troubleshooting

• Ensure Docker is installed and running with sufficient resources.
• Use docker compose logs -f <service_name> to view logs and diagnose issues.
• Double-check all environment variables and configurations in the .env file.

For additional support, you can reach out to Enjin Support.