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#ifndef QUICHE_HTTP2_ADAPTER_DATA_SOURCE_H_
#define QUICHE_HTTP2_ADAPTER_DATA_SOURCE_H_
#include <string>
#include <utility>
#include "absl/strings/string_view.h"
#include "common/platform/api/quiche_export.h"
namespace http2 {
namespace adapter {
// Represents a source of DATA frames for transmission to the peer.
class QUICHE_EXPORT_PRIVATE DataFrameSource {
public:
virtual ~DataFrameSource() {}
static constexpr ssize_t kBlocked = 0;
static constexpr ssize_t kError = -1;
// Returns the number of bytes to send in the next DATA frame, and whether
// this frame indicates the end of the data. Returns {kBlocked, false} if
// blocked, {kError, false} on error.
virtual std::pair<ssize_t, bool> SelectPayloadLength(size_t max_length) = 0;
// This method is called with a frame header and a payload length to send. The
// source should send or buffer the entire frame and return true, or return
// false without sending or buffering anything.
virtual bool Send(absl::string_view frame_header, size_t payload_length) = 0;
// If true, the end of this data source indicates the end of the stream.
// Otherwise, this data will be followed by trailers.
virtual bool send_fin() const = 0;
};
} // namespace adapter
} // namespace http2
#endif // QUICHE_HTTP2_ADAPTER_DATA_SOURCE_H_