api: forward ECS metadata URI

mpcontribs-api/main.sh

@@ -1,11 +1,17 @@
 #!/bin/bash
 
 supervisorctl start api
-# TODO only start worker/scheduler on first AWS task/container?
 
-if [ ! -z ${ECS_CONTAINER_METADATA_URI_V4} ]; then
-    http ${ECS_CONTAINER_METADATA_URI_V4}
+echo "METADATA URI: ${METADATA_URI}"
+
+if [ -z ${METADATA_URI} ]; then
+    # in docker-compose stack with one task
+    supervisorctl start worker
+    supervisorctl start scheduler
+else
+    # in AWS Fargate with potentially multiple tasks
+    http ${METADATA_URI}
+    supervisorctl start worker
+    supervisorctl start scheduler
 fi
 
-supervisorctl start worker
-supervisorctl start scheduler

mpcontribs-api/supervisord.conf

@@ -45,6 +45,7 @@ stderr_logfile_maxbytes=0
 [program:main]
 command=./main.sh
 directory=/app
+environment=METADATA_URI=%(ENV_ECS_CONTAINER_METADATA_URI_V4)s
 stdout_logfile=/dev/fd/1
 stdout_logfile_maxbytes=0
 stderr_logfile=/dev/fd/2