Back out "[flipper] Wait for server when requesting certificate files"

Summary:
This breaks in open source due to a missing rsocket symbol and
blocks our legocastle task.

Closes https://github.com/facebook/flipper/issues/224

Original commit changeset: e782b303b5e4

Reviewed By: jknoxville, danielbuechele

Differential Revision: D9289450

fbshipit-source-id: b780c300394f5793e95ef2fb6b0e6ba0150caf9a

xplat/Sonar/SonarWebSocketImpl.cpp

@@ -255,51 +255,20 @@ void SonarWebSocketImpl::requestSignedCertFromSonar() {
 
   folly::dynamic message = folly::dynamic::object("method", "signCertificate")(
       "csr", csr.c_str())("destination", absoluteFilePath("").c_str());
-  auto gettingCert = sonarState_->start("Getting cert from desktop");
-
-  sonarEventBase_->add([this, message, gettingCert]() {
+  auto sendingCSR = sonarState_->start("Send CSR to desktop");
+  sonarEventBase_->add([this, message, sendingCSR]() {
     client_->getRequester()
-        ->requestResponse(rsocket::Payload(folly::toJson(message)))
-        ->subscribe([this, gettingCert](rsocket::Payload p) {
-          gettingCert->complete();
-          SONAR_LOG("Certificate exchange complete.");
+        ->fireAndForget(rsocket::Payload(folly::toJson(message)))
+        ->subscribe([this, sendingCSR]() {
+          sendingCSR->complete();
           // Disconnect after message sending is complete.
           // This will trigger a reconnect which should use the secure channel.
-          // TODO: Connect immediately, without waiting for reconnect
           client_ = nullptr;
-        },
-        [this, message](folly::exception_wrapper e) {
-          e.handle(
-            [&](rsocket::ErrorWithPayload& errorWithPayload) {
-              std::string errorMessage = errorWithPayload.payload.moveDataToString();
-
-             if (errorMessage.compare("not implemented")) {
-               SONAR_LOG(("Desktop failed to provide certificates. Error from sonar desktop:\n" + errorMessage).c_str());
-             } else {
-              sendLegacyCertificateRequest(message);
-             }
-            },
-            [e](...) {
-             SONAR_LOG(("Error during certificate exchange:" + e.what()).c_str());
-            }
-          );
         });
   });
   failedConnectionAttempts_ = 0;
 }
 
-void SonarWebSocketImpl::sendLegacyCertificateRequest(folly::dynamic message) {
-  // Desktop is using an old version of Flipper.
-  // Fall back to fireAndForget, instead of requestResponse.
-  auto sendingRequest = sonarState_->start("Sending fallback certificate request");
-  client_->getRequester()
-   ->fireAndForget(rsocket::Payload(folly::toJson(message)))
-   ->subscribe([this, sendingRequest]() {
-     sendingRequest->complete();
-     client_ = nullptr;
-   });
-}
-
 std::string SonarWebSocketImpl::loadStringFromFile(std::string fileName) {
   if (!fileExists(fileName)) {
     return "";