Merge pull request #212 from NoshonNetworks/backend_issue

feat: apibara setup

land-registry-indexer/.env.example

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+STARTING_BLOCK=0
+LAND_REGISTRY_ADDRESS=0x5a4054a1b1389dcd48b650637977280d32f1ad8b3027bc6c7eb606bf7e28bf5
+DATABASE_URL=postgresql://username:password@localhost:5432/land_registry
+APIBARA_URL=

land-registry-indexer/Dockerfile

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+FROM node:18-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+RUN npm run build
+
+CMD ["npm", "start"] 

land-registry-indexer/README.md

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+# Land Registry Indexer
+
+An Apibara indexer for tracking and storing Land Registry smart contract events on StarkNet. This indexer maintains a complete history of land registrations, transfers, verifications, and marketplace activities in a PostgreSQL database.
+
+## Features
+
+- Tracks all Land Registry contract events
+- Stores event data in a normalized PostgreSQL database
+- Maintains relationships between lands, inspectors, and listings
+- Provides complete history of all land-related transactions
+- Supports Docker deployment
+
+## Prerequisites
+
+- Node.js >= 18
+- PostgreSQL >= 14
+- Docker and Docker Compose (for containerized deployment)
+- StarkNet node access (via Apibara)

land-registry-indexer/docker-compose.yml

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+version: '3.8'
+
+services:
+  postgres:
+    image: postgres:14
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER:-postgres}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-postgres}
+      POSTGRES_DB: ${POSTGRES_DB:-land_registry}
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+      - ./schema.sql:/docker-entrypoint-initdb.d/schema.sql
+    ports:
+      - "5432:5432"
+
+  indexer:
+    build: .
+    environment:
+      - DATABASE_URL=postgresql://${POSTGRES_USER:-postgres}:${POSTGRES_PASSWORD:-postgres}@postgres:5432/${POSTGRES_DB:-land_registry}
+      - LAND_REGISTRY_ADDRESS=${LAND_REGISTRY_ADDRESS}
+      - STARTING_BLOCK=${STARTING_BLOCK:-0}
+      - APIBARA_URL=${APIBARA_URL}
+    depends_on:
+      - postgres
+
+volumes:
+  postgres_data: 

land-registry-indexer/package.json

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+{
+  "name": "land-registry-indexer",
+  "version": "1.0.0",
+  "description": "Apibara indexer for Land Registry events",
+  "main": "src/index.ts",
+  "scripts": {
+    "build": "tsc",
+    "start": "node dist/index.js",
+    "dev": "ts-node src/index.ts"
+  },
+  "dependencies": {
+    "@apibara/indexer": "^0.3.0",
+    "@apibara/protocol": "^0.4.0",
+    "@apibara/starknet": "^0.3.0",
+    "dotenv": "^16.0.3",
+    "pg": "^8.11.0",
+    "typescript": "^5.0.4"
+  },
+  "devDependencies": {
+    "@types/node": "^20.2.5",
+    "@types/pg": "^8.10.1",
+    "ts-node": "^10.9.1"
+  }
+} 

land-registry-indexer/schema.sql

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+CREATE TABLE IF NOT EXISTS lands (
+    land_id VARCHAR PRIMARY KEY,
+    owner_address VARCHAR NOT NULL,
+    location_latitude NUMERIC,
+    location_longitude NUMERIC,
+    area NUMERIC,
+    land_use VARCHAR,
+    status VARCHAR,
+    inspector_address VARCHAR,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS land_transfers (
+    id SERIAL PRIMARY KEY,
+    land_id VARCHAR NOT NULL REFERENCES lands(land_id),
+    from_address VARCHAR NOT NULL,
+    to_address VARCHAR NOT NULL,
+    transaction_hash VARCHAR NOT NULL,
+    block_number BIGINT NOT NULL,
+    timestamp TIMESTAMP NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS land_verifications (
+    id SERIAL PRIMARY KEY,
+    land_id VARCHAR NOT NULL REFERENCES lands(land_id),
+    inspector_address VARCHAR NOT NULL,
+    transaction_hash VARCHAR NOT NULL,
+    block_number BIGINT NOT NULL,
+    timestamp TIMESTAMP NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS land_updates (
+    id SERIAL PRIMARY KEY,
+    land_id VARCHAR NOT NULL REFERENCES lands(land_id),
+    area NUMERIC,
+    land_use VARCHAR,
+    transaction_hash VARCHAR NOT NULL,
+    block_number BIGINT NOT NULL,
+    timestamp TIMESTAMP NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS inspectors (
+    address VARCHAR PRIMARY KEY,
+    is_active BOOLEAN DEFAULT true,
+    added_at TIMESTAMP NOT NULL,
+    removed_at TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS inspector_assignments (
+    id SERIAL PRIMARY KEY,
+    land_id VARCHAR NOT NULL REFERENCES lands(land_id),
+    inspector_address VARCHAR NOT NULL REFERENCES inspectors(address),
+    transaction_hash VARCHAR NOT NULL,
+    block_number BIGINT NOT NULL,
+    timestamp TIMESTAMP NOT NULL
+);
+
+-- CREATE TABLE IF NOT EXISTS fee_updates (
+--     id SERIAL PRIMARY KEY,
+--     old_fee NUMERIC NOT NULL,
+--     new_fee NUMERIC NOT NULL,
+--     transaction_hash VARCHAR NOT NULL,
+--     block_number BIGINT NOT NULL,
+--     timestamp TIMESTAMP NOT NULL
+-- );
+
+CREATE TABLE IF NOT EXISTS listings (
+    id SERIAL PRIMARY KEY,
+    land_id VARCHAR NOT NULL REFERENCES lands(land_id),
+    seller_address VARCHAR NOT NULL,
+    price NUMERIC NOT NULL,
+    status VARCHAR NOT NULL,
+    created_at TIMESTAMP NOT NULL,
+    updated_at TIMESTAMP NOT NULL,
+    transaction_hash VARCHAR NOT NULL,
+    block_number BIGINT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS listing_price_updates (
+    id SERIAL PRIMARY KEY,
+    listing_id INTEGER NOT NULL REFERENCES listings(id),
+    old_price NUMERIC NOT NULL,
+    new_price NUMERIC NOT NULL,
+    transaction_hash VARCHAR NOT NULL,
+    block_number BIGINT NOT NULL,
+    timestamp TIMESTAMP NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS land_sales (
+    id SERIAL PRIMARY KEY,
+    listing_id INTEGER NOT NULL REFERENCES listings(id),
+    land_id VARCHAR NOT NULL REFERENCES lands(land_id),
+    seller_address VARCHAR NOT NULL,
+    buyer_address VARCHAR NOT NULL,
+    price NUMERIC NOT NULL,
+    transaction_hash VARCHAR NOT NULL,
+    block_number BIGINT NOT NULL,
+    timestamp TIMESTAMP NOT NULL
+); 

land-registry-indexer/src/config.ts

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+/**
+ * Configuration settings for the Land Registry Indexer
+ * 
+ * This module loads environment variables from a .env file and provides
+ * configuration constants used throughout the application.
+ */
+
+import dotenv from 'dotenv';
+dotenv.config();
+
+export const config = {
+  startingBlock: Number(process.env.STARTING_BLOCK || 0),
+  landRegistryAddress: process.env.LAND_REGISTRY_ADDRESS || '',
+  pgConnection: process.env.DATABASE_URL || '',
+  apibaraUrl: process.env.APIBARA_URL || '',
+};