Move bidirectional_stream_c.h back to third_party/objective_c/Cronet

1 files changed, 246 insertions, 0 deletions

diff --git a/third_party/objective_c/Cronet/bidirectional_stream_c.h b/third_party/objective_c/Cronet/bidirectional_stream_c.h
new file mode 100644
index 0000000000..ffb235ae87
--- /dev/null
+++ b/third_party/objective_c/Cronet/bidirectional_stream_c.h
@@ -0,0 +1,246 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_GRPC_SUPPORT_INCLUDE_BIDIRECTIONAL_STREAM_C_H_
+#define COMPONENTS_GRPC_SUPPORT_INCLUDE_BIDIRECTIONAL_STREAM_C_H_
+
+#if defined(WIN32)
+#define GRPC_SUPPORT_EXPORT
+#else
+#define GRPC_SUPPORT_EXPORT __attribute__((visibility("default")))
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h>
+
+/* Engine API. */
+
+/* Opaque object representing a Bidirectional stream creating engine. Created
+ * and configured outside of this API to facilitate sharing with other
+ * components */
+typedef struct stream_engine {
+  void* obj;
+  void* annotation;
+} stream_engine;
+
+/* Bidirectional Stream API */
+
+/* Opaque object representing Bidirectional Stream. */
+typedef struct bidirectional_stream {
+  void* obj;
+  void* annotation;
+} bidirectional_stream;
+
+/* A single request or response header element. */
+typedef struct bidirectional_stream_header {
+  const char* key;
+  const char* value;
+} bidirectional_stream_header;
+
+/* Array of request or response headers or trailers. */
+typedef struct bidirectional_stream_header_array {
+  size_t count;
+  size_t capacity;
+  bidirectional_stream_header* headers;
+} bidirectional_stream_header_array;
+
+/* Set of callbacks used to receive callbacks from bidirectional stream. */
+typedef struct bidirectional_stream_callback {
+  /* Invoked when the stream is ready for reading and writing.
+   * Consumer may call bidirectional_stream_read() to start reading data.
+   * Consumer may call bidirectional_stream_write() to start writing
+   * data.
+   */
+  void (*on_stream_ready)(bidirectional_stream* stream);
+
+  /* Invoked when initial response headers are received.
+   * Consumer must call bidirectional_stream_read() to start reading.
+   * Consumer may call bidirectional_stream_write() to start writing or
+   * close the stream. Contents of |headers| is valid for duration of the call.
+   */
+  void (*on_response_headers_received)(
+      bidirectional_stream* stream,
+      const bidirectional_stream_header_array* headers,
+      const char* negotiated_protocol);
+
+  /* Invoked when data is read into the buffer passed to
+   * bidirectional_stream_read(). Only part of the buffer may be
+   * populated. To continue reading, call bidirectional_stream_read().
+   * It may be invoked after on_response_trailers_received()}, if there was
+   * pending read data before trailers were received.
+   *
+   * If |bytes_read| is 0, it means the remote side has signaled that it will
+   * send no more data; future calls to bidirectional_stream_read()
+   * will result in the on_data_read() callback or on_succeded() callback if
+   * bidirectional_stream_write() was invoked with end_of_stream set to
+   * true.
+   */
+  void (*on_read_completed)(bidirectional_stream* stream,
+                            char* data,
+                            int bytes_read);
+
+  /**
+   * Invoked when all data passed to bidirectional_stream_write() is
+   * sent. To continue writing, call bidirectional_stream_write().
+   */
+  void (*on_write_completed)(bidirectional_stream* stream, const char* data);
+
+  /* Invoked when trailers are received before closing the stream. Only invoked
+   * when server sends trailers, which it may not. May be invoked while there is
+   * read data remaining in local buffer. Contents of |trailers| is valid for
+   * duration of the call.
+   */
+  void (*on_response_trailers_received)(
+      bidirectional_stream* stream,
+      const bidirectional_stream_header_array* trailers);
+
+  /**
+   * Invoked when there is no data to be read or written and the stream is
+   * closed successfully remotely and locally. Once invoked, no further callback
+   * methods will be invoked.
+   */
+  void (*on_succeded)(bidirectional_stream* stream);
+
+  /**
+   * Invoked if the stream failed for any reason after
+   * bidirectional_stream_start(). HTTP/2 error codes are
+   * mapped to chrome net error codes. Once invoked, no further callback methods
+   * will be invoked.
+   */
+  void (*on_failed)(bidirectional_stream* stream, int net_error);
+
+  /**
+   * Invoked if the stream was canceled via
+   * bidirectional_stream_cancel(). Once invoked, no further callback
+   * methods will be invoked.
+   */
+  void (*on_canceled)(bidirectional_stream* stream);
+} bidirectional_stream_callback;
+
+/* Creates a new stream object that uses |engine| and |callback|. All stream
+ * tasks are performed asynchronously on the |engine| network thread. |callback|
+ * methods are invoked synchronously on the |engine| network thread, but must
+ * not run tasks on the current thread to prevent blocking networking operations
+ * and causing exceptions during shutdown. The |annotation| is stored in
+ * bidirectional stream for arbitrary use by application.
+ *
+ * Returned |bidirectional_stream*| is owned by the caller, and must be
+ * destroyed using |bidirectional_stream_destroy|.
+ *
+ * Both |calback| and |engine| must remain valid until stream is destroyed.
+ */
+GRPC_SUPPORT_EXPORT
+bidirectional_stream* bidirectional_stream_create(
+    stream_engine* engine,
+    void* annotation,
+    bidirectional_stream_callback* callback);
+
+/* TBD: The following methods return int. Should it be a custom type? */
+
+/* Destroys stream object. Destroy could be called from any thread, including
+ * network thread, but is posted, so |stream| is valid until calling task is
+ * complete.
+ */
+GRPC_SUPPORT_EXPORT
+int bidirectional_stream_destroy(bidirectional_stream* stream);
+
+/**
+ * Disables or enables auto flush. By default, data is flushed after
+ * every bidirectional_stream_write(). If the auto flush is disabled,
+ * the client should explicitly call bidirectional_stream_flush to flush
+ * the data.
+ */
+GRPC_SUPPORT_EXPORT void bidirectional_stream_disable_auto_flush(
+    bidirectional_stream* stream,
+    bool disable_auto_flush);
+
+/**
+ * Delays sending request headers until bidirectional_stream_flush()
+ * is called. This flag is currently only respected when QUIC is negotiated.
+ * When true, QUIC will send request header frame along with data frame(s)
+ * as a single packet when possible.
+ */
+GRPC_SUPPORT_EXPORT
+void bidirectional_stream_delay_request_headers_until_flush(
+    bidirectional_stream* stream,
+    bool delay_headers_until_flush);
+
+/* Starts the stream by sending request to |url| using |method| and |headers|.
+ * If |end_of_stream| is true, then no data is expected to be written. The
+ * |method| is HTTP verb, with PUT having a special meaning to mark idempotent
+ * request, which could use QUIC 0-RTT.
+ */
+GRPC_SUPPORT_EXPORT
+int bidirectional_stream_start(bidirectional_stream* stream,
+                               const char* url,
+                               int priority,
+                               const char* method,
+                               const bidirectional_stream_header_array* headers,
+                               bool end_of_stream);
+
+/* Reads response data into |buffer| of |capacity| length. Must only be called
+ * at most once in response to each invocation of the
+ * on_stream_ready()/on_response_headers_received() and on_read_completed()
+ * methods of the bidirectional_stream_callback.
+ * Each call will result in an invocation of the callback's
+ * on_read_completed() method if data is read, or its on_failed() method if
+ * there's an error. The callback's on_succeeded() method is also invoked if
+ * there is no more data to read and |end_of_stream| was previously sent.
+ */
+GRPC_SUPPORT_EXPORT
+int bidirectional_stream_read(bidirectional_stream* stream,
+                              char* buffer,
+                              int capacity);
+
+/* Writes request data from |buffer| of |buffer_length| length. If auto flush is
+ * disabled, data will be sent only after bidirectional_stream_flush() is
+ * called.
+ * Each call will result in an invocation the callback's on_write_completed()
+ * method if data is sent, or its on_failed() method if there's an error.
+ * The callback's on_succeeded() method is also invoked if |end_of_stream| is
+ * set and all response data has been read.
+ */
+GRPC_SUPPORT_EXPORT
+int bidirectional_stream_write(bidirectional_stream* stream,
+                               const char* buffer,
+                               int buffer_length,
+                               bool end_of_stream);
+
+/**
+ * Flushes pending writes. This method should not be called before invocation of
+ * on_stream_ready() method of the bidirectional_stream_callback.
+ * For each previously called bidirectional_stream_write()
+ * a corresponding on_write_completed() callback will be invoked when the buffer
+ * is sent.
+ */
+GRPC_SUPPORT_EXPORT
+void bidirectional_stream_flush(bidirectional_stream* stream);
+
+/* Cancels the stream. Can be called at any time after
+ * bidirectional_stream_start(). The on_canceled() method of
+ * bidirectional_stream_callback will be invoked when cancelation
+ * is complete and no further callback methods will be invoked. If the
+ * stream has completed or has not started, calling
+ * bidirectional_stream_cancel() has no effect and on_canceled() will not
+ * be invoked. At most one callback method may be invoked after
+ * bidirectional_stream_cancel() has completed.
+ */
+GRPC_SUPPORT_EXPORT
+void bidirectional_stream_cancel(bidirectional_stream* stream);
+
+/* Returns true if the |stream| was successfully started and is now done
+ * (succeeded, canceled, or failed).
+ * Returns false if the |stream| stream is not yet started or is in progress.
+ */
+GRPC_SUPPORT_EXPORT
+bool bidirectional_stream_is_done(bidirectional_stream* stream);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // COMPONENTS_GRPC_SUPPORT_INCLUDE_BIDIRECTIONAL_STREAM_H_