fix: add keepalive changes to synth.py (#55)

Co-authored-by: larkee <larkee@users.noreply.github.com>

Author: larkee

synth.py

@@ -46,7 +46,14 @@
 s.replace(
  "google/cloud/spanner_v1/gapic/transports/spanner_grpc_transport.py",
  "from google.cloud.spanner_v1.proto import spanner_pb2_grpc\n",
- "\g<0>\n\n_SPANNER_GRPC_CONFIG = 'spanner.grpc.config'\n",
+ "\g<0>\n\n_GRPC_KEEPALIVE_MS = 2 * 60 * 1000\n"
+ "_SPANNER_GRPC_CONFIG = 'spanner.grpc.config'\n",
+)
+
+s.replace(
+ "google/cloud/spanner_v1/gapic/transports/spanner_grpc_transport.py",
+ "(\s+)'grpc.max_receive_message_length': -1,",
+ "\g<0>\g<1>\"grpc.keepalive_time_ms\": _GRPC_KEEPALIVE_MS,",
 )
 
 s.replace(