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#include "source/common/http/http2/nghttp2.h"
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#include "source/common/common/logger.h"

            

        

            

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// nghttp2 fails to convey the POSIX ssize_t declaration

            

        

            

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// that Microsoft declines to implement. Pick up a valid

            

        

            

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// ssize_t declaration for win32 in our platform.h

            

        

            

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#include "envoy/common/platform.h"

            

        

            

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#include "nghttp2/nghttp2.h"

            

        

            

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namespace Envoy {

            

        

            

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namespace Http {

            

        

            

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namespace Http2 {

            

        

            

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void initializeNghttp2Logging() {

            

        

            

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  // When ENVOY_NGHTTP2_TRACE is set, we install a debug logger, to prevent nghttp2

            

        

            

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  // logging directly to stdout at -l trace.

            

        

            

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  nghttp2_set_debug_vprintf_callback([](const char* format, va_list args) {

            

        

            

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    if (std::getenv("ENVOY_NGHTTP2_TRACE") != nullptr) {

            

        

            

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      char buf[2048];

            

        

            

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      const int n = ::vsnprintf(buf, sizeof(buf), format, args);

            

        

            

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      // nghttp2 inserts new lines, but we also insert a new line in the ENVOY_LOG

            

        

            

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      // below, so avoid double \n.

            

        

            

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      if (n >= 1 && static_cast<size_t>(n) < sizeof(buf) && buf[n - 1] == '\n') {

            

        

            

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        buf[n - 1] = '\0';

            

        

            

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      }

            

        

            

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      ENVOY_LOG_TO_LOGGER(Logger::Registry::getLog(Logger::Id::http2), trace, "nghttp2: {}", buf);

            

        

            

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    }

            

        

            

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  });

            

        

            

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}

            

        

            

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} // namespace Http2

            

        

            

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} // namespace Http

            

        

            

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} // namespace Envoy