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[cdc_stream] Automatically start service (#28)

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Starts the streaming service if it's not up and running. This required
adding the ability to run a detached process. By default, all child
processes are killed when the parent process exits. Since detached
child processes don't run with a console, they need to create sub-
processes with CREATE_NO_WINDOW since otherwise a new console pops up,
e.g. for every ssh command.

Polls for 20 seconds while the service starts up. For this purpose,
a BackgroundServiceClient is added. This will be reused in a future CL
by a new stop-service command to exit the service.

Also adds --service-port as additional argument to start-service.
This commit is contained in:
Lutz Justen
2022-12-02 14:34:36 +01:00
committed by GitHub
parent 6d63aa72d7
commit 1120dcbee0
21 changed files with 372 additions and 76 deletions
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10
cdc_stream/background_service_impl.h
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@@ -30,9 +30,6 @@ namespace cdc_ft {
class BackgroundServiceImpl final
: public backgroundservice::BackgroundService::Service {
public:
using ExitRequest = backgroundservice::ExitRequest;
using ExitResponse = backgroundservice::ExitResponse;
using GetPidRequest = backgroundservice::GetPidRequest;
using GetPidResponse = backgroundservice::GetPidResponse;
using EmptyProto = google::protobuf::Empty;
@@ -43,11 +40,10 @@ class BackgroundServiceImpl final
using ExitCallback = std::function<absl::Status()>;
void SetExitCallback(ExitCallback exit_callback);
grpc::Status Exit(grpc::ServerContext* context, const ExitRequest* request,
ExitResponse* response) override;
grpc::Status Exit(grpc::ServerContext* context, const EmptyProto* request,
EmptyProto* response) override;
grpc::Status GetPid(grpc::ServerContext* context,
const GetPidRequest* request,
grpc::Status GetPid(grpc::ServerContext* context, const EmptyProto* request,
GetPidResponse* response) override;
grpc::Status HealthCheck(grpc::ServerContext* context,