emulator.sh: add support for the special value of "gradle" for the -c command-line argument, causing it to use the same data connect emulator binary that is used by the gradle build.

Author: dconeybe

firebase-dataconnect/emulator/emulator.sh

@@ -58,13 +58,26 @@ function parse_args {
         exit 2
         ;;
       *)
-        echo "INTERNAL ERROR: unknown argument: $arg" >&2
-        exit 1
+        log_error_and_exit "INTERNAL ERROR: unknown argument: $arg"
         ;;
     esac
   done
 
-  export DATACONNECT_EMULATOR_BINARY_PATH="${emulator_binary}"
+  if [[ $emulator_binary != "gradle" ]] ; then
+    export DATACONNECT_EMULATOR_BINARY_PATH="${emulator_binary}"
+  else
+    run_command "${SCRIPT_DIR}/../../gradlew" -p "${SCRIPT_DIR}/../.." --configure-on-demand :firebase-dataconnect:connectors:downloadDebugDataConnectExecutable
+    local gradle_emulator_binaries=("${SCRIPT_DIR}"/../connectors/build/intermediates/dataconnect/debug/executable/*)
+    if [[ ${#gradle_emulator_binaries[@]} -ne 1 ]]; then
+      log_error_and_exit "expected exactly 1 emulator binary from gradle, but got ${#gradle_emulator_binaries[@]}: ${gradle_emulator_binaries[*]}"
+    fi
+    local gradle_emulator_binary="${gradle_emulator_binaries[@]}"
+    if [[ ! -e $gradle_emulator_binary ]] ; then
+      log_error_and_exit "emulator binary from gradle does not exist: ${gradle_emulator_binary}"
+    fi
+    export DATACONNECT_EMULATOR_BINARY_PATH="${gradle_emulator_binaries[0]}"
+  fi
+
   export FIREBASE_DATACONNECT_POSTGRESQL_STRING="${postgresql_string}"
   export DATA_CONNECT_PREVIEW="${preview_flags}"
 
@@ -90,8 +103,9 @@ function print_help {
   echo
   echo "Options:"
   echo "  -c <data_connect_emulator_binary_path>"
-  echo "    Uses the Data Connect Emulator binary at the given path. If not specified, "
-  echo "    or if specified as the empty string, then the emulator binary is downloaded."
+  echo "    Uses the Data Connect Emulator binary at the given path. A value of \"gradle\" "
+  echo "    will use the same CLI as the Gradle build. If not specified, or if specified "
+  echo "    as the empty string, then the emulator binary is downloaded."
   echo
   echo "  -p <postgresql_connection_string>"
   echo "    Uses the given string to connect to the PostgreSQL server. If not specified "
@@ -116,4 +130,9 @@ function log {
   echo "${LOG_PREFIX}$*"
 }
 
+function log_error_and_exit {
+  echo "${LOG_PREFIX}ERROR: $*" >&2
+  exit 1
+}
+
 main "$@"