added docker file and necessary utils for production environment

.gitignore

@@ -39,3 +39,6 @@ lerna-debug.log*
 
 #e2e 
 /e2e/.logs
+
+#dev
+/config/dev.config.yaml

config/config.template.yaml

@@ -0,0 +1,19 @@
+db:
+  path:  ${SQLITE_PATH}
+  synchronize: false
+app:
+  port: ${PORT}
+  network: ${NETWORK}
+  requestRetry:
+    delay: ${DELAY} # delay in Milliseconds
+    count: ${COUNT} 
+providerType: ${PROVIDER_TYPE}
+esplora:
+  url: ${HOST}
+  batchSize: ${BATCH_SIZE}
+bitcoinCore:
+  protocol: ${PROTOCOL} # http | https
+  rpcHost: ${RPC_HOST}
+  rpcPass: ${RPC_PASS}
+  rpcUser: ${RPC_USER}
+  rpcPort: ${RPC_PORT}

dockerfile

@@ -0,0 +1,44 @@
+# Stage 1: Build the NestJS application
+FROM node:18-alpine AS builder
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy package.json and package-lock.json for efficient layer caching
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy the rest of the application code
+COPY . .
+
+# Build the application
+RUN npm run build
+
+# Stage 2: Production image
+FROM node:18-alpine AS production
+
+#Set the working directory in the container
+WORKDIR /app
+
+# Generate config.yml by replacing placeholders in config.yml.template
+RUN apk add --no-cache gettext
+
+#Copy the compiled application from the build stage
+COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/migrations ./migrations
+COPY --from=builder /app/migrate.js ./migrate.js
+
+#Copy package.json and install only production dependencies
+COPY package.json ./
+RUN npm install --only=production
+
+# Set environment variables for SQLite path and app port
+ENV SQLITE_PATH="/app/.silent-pay-indexer/db/database.sqlite"
+ENV APP_PORT="3000"
+
+EXPOSE $APP_PORT
+
+# Set up entrypoint to handle database migration and config generation
+ENTRYPOINT ["sh", "-c", "node migrate.js && envsubst < dist/config/config.template.yaml > dist/config/config.yaml && node dist/main.js"]

migrate.js

@@ -0,0 +1,47 @@
+/* eslint-disable no-console */
+/* eslint-disable @typescript-eslint/no-var-requires */
+const sqlite3 = require('sqlite3').verbose();
+const fs = require('fs');
+const path = require('path');
+
+// Set the database directory and file path
+const dbPath = process.env.SQLITE_PATH;
+const dbDir = path.dirname(dbPath);
+
+// Ensure the database directory exists, creating it if necessary
+if (!fs.existsSync(dbDir)) {
+    fs.mkdirSync(dbDir, { recursive: true });
+}
+
+const db = new sqlite3.Database(dbPath);
+
+// Function to run migrations
+async function runMigrations() {
+    const migrationsDir = path.join(__dirname, 'migrations');
+
+    // Read migration files in sorted order
+    const files = fs.readdirSync(migrationsDir).sort();
+
+    for (const file of files) {
+        const filePath = path.join(migrationsDir, file);
+        const sql = fs.readFileSync(filePath, 'utf-8');
+        console.log(`Running migration: ${file}`);
+
+        // Execute each SQL file
+        await new Promise((resolve, reject) => {
+            db.exec(sql, (err) => {
+                if (err) reject(err);
+                else resolve();
+            });
+        });
+    }
+    console.log('All migrations applied.');
+}
+
+// Run migrations, then close the database connection
+runMigrations()
+    .then(() => db.close())
+    .catch((err) => {
+        console.error('Migration failed:', err);
+        db.close();
+    });

migrations/001_create_transaction_table.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS "transaction" (
+    id TEXT PRIMARY KEY,
+    blockHeight INTEGER NOT NULL,
+    blockHash TEXT NOT NULL,
+    scanTweak TEXT NOT NULL,
+    outputs TEXT NOT NULL,
+    isSpent BOOLEAN NOT NULL
+);

migrations/002_create_operation_state_table.sql

@@ -0,0 +1,4 @@
+CREATE TABLE IF NOT EXISTS "operation_state" (
+    id TEXT PRIMARY KEY,
+    state TEXT
+);