Fix CRT HTTP Client transcribe streaming

Author: SergeyRyabinin

src/aws-cpp-sdk-core/source/http/crt/CRTHttpClient.cpp

@@ -20,13 +20,21 @@ static const char *const CRT_HTTP_CLIENT_TAG = "CRTHttpClient";
 // Adapts AWS SDK input streams and rate limiters to the CRT input stream reading model.
 class SDKAdaptingInputStream : public Aws::Crt::Io::StdIOStreamInputStream {
 public:
-    SDKAdaptingInputStream(const std::shared_ptr<Aws::Utils::RateLimits::RateLimiterInterface>& rateLimiter, std::shared_ptr<Aws::Crt::Io::IStream> stream,
-        const Aws::Http::HttpClient& client, const Aws::Http::HttpRequest& request, bool isStreaming,
-        Aws::Crt::Allocator *allocator = Aws::Crt::ApiAllocator()) noexcept :
-        Aws::Crt::Io::StdIOStreamInputStream(std::move(stream), allocator), m_rateLimiter(rateLimiter),
-        m_client(client), m_currentRequest(request), m_isStreaming(isStreaming), m_chunkEnd(false) 
+    SDKAdaptingInputStream(const std::shared_ptr<Aws::Utils::RateLimits::RateLimiterInterface>& rateLimiter,
+                           std::shared_ptr<Aws::Crt::Io::IStream> stream,
+                           const Aws::Http::HttpClient& client,
+                           const Aws::Http::HttpRequest& request,
+                           bool isStreaming,
+                           Aws::Crt::Allocator* allocator = Aws::Crt::ApiAllocator()) noexcept :
+        Aws::Crt::Io::StdIOStreamInputStream(std::move(stream), allocator),
+        m_rateLimiter(rateLimiter),
+        m_client(client),
+        m_currentRequest(request),
+        m_isStreaming(isStreaming),
+        m_chunkEnd(false)
     {
     }
+
 protected:
 
     bool ReadImpl(Aws::Crt::ByteBuf &buffer) noexcept override
@@ -56,7 +64,18 @@ class SDKAdaptingInputStream : public Aws::Crt::Io::StdIOStreamInputStream {
 
             // now do the read. We may over read by an IO buffer size, but it's fine. The throttle will still
             // kick-in in plenty of time.
-            bool retValue = Aws::Crt::Io::StdIOStreamInputStream::ReadImpl(buffer);
+            bool retValue = false;
+            if (!m_isStreaming)
+            {
+                retValue = Aws::Crt::Io::StdIOStreamInputStream::ReadImpl(buffer);
+            }
+            else
+            {
+                if (StdIOStreamInputStream::GetStatusImpl().is_valid && StdIOStreamInputStream::PeekImpl() != std::char_traits<char>::eof())
+                {
+                    retValue = Aws::Crt::Io::StdIOStreamInputStream::ReadSomeImpl(buffer);
+                }
+            }
             size_t newPos = buffer.len;
             AWS_ASSERT(newPos >= currentPos && "the buffer length should not have decreased in value.");
 
@@ -161,10 +180,10 @@ class AsyncWaiter
         m_cvar.wait(uniqueLocker, [this](){return m_wakeupIntentional;});
     }
 
-    bool WaitOnCompletionUntil(std::chrono::time_point<std::chrono::high_resolution_clock> until)
+    bool WaitOnCompletionFor(const size_t ms)
     {
         std::unique_lock<std::mutex> uniqueLocker(m_lock);
-        return m_cvar.wait_until(uniqueLocker, until, [this](){return m_wakeupIntentional;});
+        return m_cvar.wait_for(uniqueLocker, std::chrono::milliseconds(ms), [this](){return m_wakeupIntentional;});
     }
 
 private:
@@ -431,9 +450,14 @@ namespace Aws
 
             // This will arrive at or around the same time as the headers. Use it to set the response code on the response
             requestOptions.onIncomingHeadersBlockDone =
-                [response](Crt::Http::HttpStream& stream, enum aws_http_header_block block)
+                [request, response](Crt::Http::HttpStream& stream, enum aws_http_header_block block)
             {
                 OnIncomingHeadersBlockDone(stream, block, response);
+                auto& headersHandler = request->GetHeadersReceivedEventHandler();
+                if (headersHandler)
+                {
+                    headersHandler(request.get(), response.get());
+                }
             };
 
             // CRT client is async only so we'll need to do the synchronous part ourselves.
@@ -467,9 +491,7 @@ namespace Aws
             // all that effort if that's the worst thing that can happen?
             if (m_configuration.requestTimeoutMs > 0 )
             {
-                auto requestExpiryTime = std::chrono::high_resolution_clock::now() +
-                                         std::chrono::milliseconds(m_configuration.requestTimeoutMs);
-                waiterTimedOut = !waiter.WaitOnCompletionUntil(requestExpiryTime);
+                waiterTimedOut = !waiter.WaitOnCompletionFor(m_configuration.requestTimeoutMs);
 
                 // if this is true, the waiter timed out without a terminal condition being woken up.
                 if (waiterTimedOut)