[LEIP-251] Add a Wait Loop for Identity Provider Server

With this addition, the container waits for the configured identity provider to be up and running, before continuing execution. This ensures successful start up in environments, where the identity provider is started in parallel to the collector.

collector/entrypoint.sh

@@ -33,7 +33,8 @@ main() {
   loadApiParameters
   loadCollectorParameters
   loadConfig
-  waitForDependency "mongo" 27017
+  waitForDependency "mongo:27017"
+  waitForDependency "$CYFACE_OAUTH_SITE"
   startApi
 }
 
@@ -190,12 +191,16 @@ loadConfig() {
   }"
 }
 
-# Parameter 1: Name of the Docker Container of the dependency to wait for
-# Parameter 2: Internal Docker port of the dependency to wait for
+# Parameter 1: URL to the service to wait for
 waitForDependency() {
-  local service="$1"
-  local port="$2"
-  echo && echo "Waiting for $service:$port to start..."
+  local URL="$1"
+
+  HOST_PORT=$(awk -F/ '{print $3}' <<<"$URL")
+  HOST_PORT_ARRAY=($(echo "$HOST_PORT" | tr ":" "\n"))
+  local host=${HOST_PORT_ARRAY[0]}
+  local port=${HOST_PORT_ARRAY[1]}
+
+  echo && echo "Waiting for $host:$port to start..."
 
   local attempts=0
   local max_attempts=10
@@ -205,15 +210,15 @@ waitForDependency() {
     ((attempts++))
     echo "Attempt $attempts"
 
-    if nc -z "$service" "$port" > /dev/null 2>&1; then
-      echo "$service is up!"
+    if nc -z "$host" "$port" > /dev/null 2>&1; then
+      echo "$host is up!"
       return 0
     else
       sleep "$sleep_duration"
     fi
   done
 
-  echo "Unable to find $service:$port after $max_attempts attempts! API will not start."
+  echo "Unable to find $host:$port after $max_attempts attempts! API will not start."
   exit 1
 }