Add function to fetch availability zone id (#2326)

indexer/packages/base/package.json

@@ -32,6 +32,7 @@
   },
   "homepage": "https://github.com/dydxprotocol/indexer#readme",
   "dependencies": {
+    "@aws-sdk/client-ec2": "^3.354.0",
     "axios": "^1.2.1",
     "big.js": "^6.2.1",
     "bignumber.js": "^9.0.2",

indexer/packages/base/src/az-id.ts

@@ -0,0 +1,51 @@
+import { DescribeAvailabilityZonesCommand, EC2Client } from '@aws-sdk/client-ec2';
+
+import { axiosRequest } from './axios';
+import config from './config';
+import logger from './logger';
+
+export async function getAvailabilityZoneId(): Promise<string> {
+  if (config.ECS_CONTAINER_METADATA_URI_V4 !== '' && config.AWS_REGION !== '') {
+    const taskUrl = `${config.ECS_CONTAINER_METADATA_URI_V4}/task`;
+    try {
+      const response = await axiosRequest({
+        method: 'GET',
+        url: taskUrl,
+      }) as { AvailabilityZone: string };
+      const client = new EC2Client({ region: config.AWS_REGION });
+      const command = new DescribeAvailabilityZonesCommand({
+        ZoneNames: [response.AvailabilityZone],
+      });
+      try {
+        const ec2Response = await client.send(command);
+        const zoneId = ec2Response.AvailabilityZones![0].ZoneId!;
+        logger.info({
+          at: 'az-id#getAvailabilityZoneId',
+          message: `Got availability zone id ${zoneId}.`,
+        });
+        return ec2Response.AvailabilityZones![0].ZoneId!;
+      } catch (error) {
+        logger.error({
+          at: 'az-id#getAvailabilityZoneId',
+          message: 'Failed to fetch availabilty zone id from EC2. ',
+          error,
+        });
+        return '';
+      }
+    } catch (error) {
+      logger.error({
+        at: 'az-id#getAvailabilityZoneId',
+        message: 'Failed to retrieve availability zone from metadata endpoint. No availabilty zone id found.',
+        error,
+        taskUrl,
+      });
+      return '';
+    }
+  } else {
+    logger.error({
+      at: 'az-id#getAvailabilityZoneId',
+      message: 'No metadata URI or region. No availabilty zone id found.',
+    });
+    return '';
+  }
+}

indexer/packages/base/src/config.ts

@@ -39,6 +39,7 @@ export const baseConfigSchema = {
   STATSD_PORT: parseInteger({ default: 8125 }),
   LOG_LEVEL: parseString({ default: 'debug' }),
   ECS_CONTAINER_METADATA_URI_V4: parseString({ default: '' }),
+  AWS_REGION: parseString({ default: '' }),
 };
 
 export default parseSchema(baseConfigSchema);

indexer/packages/base/src/index.ts

@@ -14,6 +14,7 @@ export * from './bugsnag';
 export * from './stats-util';
 export * from './date-helpers';
 export * from './instance-id';
+export * from './az-id';
 
 // Do this outside logger.ts to avoid a dependency cycle with logger transports that may trigger
 // additional logging.