Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc-cloned / deps / grpc / src / core / ext / transport / chttp2 / transport / frame_window_update.cc

diff --git a/legacy-libs/grpc-cloned/deps/grpc/src/core/ext/transport/chttp2/transport/frame_window_update.cc b/legacy-libs/grpc-cloned/deps/grpc/src/core/ext/transport/chttp2/transport/frame_window_update.cc
new file mode 100644 (file)
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+++ b/legacy-libs/grpc-cloned/deps/grpc/src/core/ext/transport/chttp2/transport/frame_window_update.cc
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+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/ext/transport/chttp2/transport/frame_window_update.h"
+#include "src/core/ext/transport/chttp2/transport/internal.h"
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+
+grpc_slice grpc_chttp2_window_update_create(
+    uint32_t id, uint32_t window_update, grpc_transport_one_way_stats* stats) {
+  static const size_t frame_size = 13;
+  grpc_slice slice = GRPC_SLICE_MALLOC(frame_size);
+  stats->header_bytes += frame_size;
+  uint8_t* p = GRPC_SLICE_START_PTR(slice);
+
+  GPR_ASSERT(window_update);
+
+  *p++ = 0;
+  *p++ = 0;
+  *p++ = 4;
+  *p++ = GRPC_CHTTP2_FRAME_WINDOW_UPDATE;
+  *p++ = 0;
+  *p++ = static_cast<uint8_t>(id >> 24);
+  *p++ = static_cast<uint8_t>(id >> 16);
+  *p++ = static_cast<uint8_t>(id >> 8);
+  *p++ = static_cast<uint8_t>(id);
+  *p++ = static_cast<uint8_t>(window_update >> 24);
+  *p++ = static_cast<uint8_t>(window_update >> 16);
+  *p++ = static_cast<uint8_t>(window_update >> 8);
+  *p++ = static_cast<uint8_t>(window_update);
+
+  return slice;
+}
+
+grpc_error* grpc_chttp2_window_update_parser_begin_frame(
+    grpc_chttp2_window_update_parser* parser, uint32_t length, uint8_t flags) {
+  if (flags || length != 4) {
+    char* msg;
+    gpr_asprintf(&msg, "invalid window update: length=%d, flags=%02x", length,
+                 flags);
+    grpc_error* err = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
+    gpr_free(msg);
+    return err;
+  }
+  parser->byte = 0;
+  parser->amount = 0;
+  return GRPC_ERROR_NONE;
+}
+
+grpc_error* grpc_chttp2_window_update_parser_parse(void* parser,
+                                                   grpc_chttp2_transport* t,
+                                                   grpc_chttp2_stream* s,
+                                                   const grpc_slice& slice,
+                                                   int is_last) {
+  const uint8_t* const beg = GRPC_SLICE_START_PTR(slice);
+  const uint8_t* const end = GRPC_SLICE_END_PTR(slice);
+  const uint8_t* cur = beg;
+  grpc_chttp2_window_update_parser* p =
+      static_cast<grpc_chttp2_window_update_parser*>(parser);
+
+  while (p->byte != 4 && cur != end) {
+    p->amount |= (static_cast<uint32_t>(*cur)) << (8 * (3 - p->byte));
+    cur++;
+    p->byte++;
+  }
+
+  if (s != nullptr) {
+    s->stats.incoming.framing_bytes += static_cast<uint32_t>(end - cur);
+  }
+
+  if (p->byte == 4) {
+    // top bit is reserved and must be ignored.
+    uint32_t received_update = p->amount & 0x7fffffffu;
+    if (received_update == 0) {
+      char* msg;
+      gpr_asprintf(&msg, "invalid window update bytes: %d", p->amount);
+      grpc_error* err = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
+      gpr_free(msg);
+      return err;
+    }
+    GPR_ASSERT(is_last);
+
+    if (t->incoming_stream_id != 0) {
+      if (s != nullptr) {
+        s->flow_control->RecvUpdate(received_update);
+        if (grpc_chttp2_list_remove_stalled_by_stream(t, s)) {
+          grpc_chttp2_mark_stream_writable(t, s);
+          grpc_chttp2_initiate_write(
+              t, GRPC_CHTTP2_INITIATE_WRITE_FLOW_CONTROL_UNSTALLED_BY_UPDATE);
+        }
+      }
+    } else {
+      bool was_zero = t->flow_control->remote_window() <= 0;
+      t->flow_control->RecvUpdate(received_update);
+      bool is_zero = t->flow_control->remote_window() <= 0;
+      if (was_zero && !is_zero) {
+        grpc_chttp2_initiate_write(
+            t, GRPC_CHTTP2_INITIATE_WRITE_TRANSPORT_FLOW_CONTROL_UNSTALLED);
+      }
+    }
+  }
+
+  return GRPC_ERROR_NONE;
+}