Initial checkin of gRPC to third_party/

third_party/grpc/src/core/surface/channel.c

Index: third_party/grpc/src/core/surface/channel.c
diff --git a/third_party/grpc/src/core/surface/channel.c b/third_party/grpc/src/core/surface/channel.c
new file mode 100644
index 0000000000000000000000000000000000000000..12d8ebceb9045f08f76ba8e424ecdc611eee1782
--- /dev/null
+++ b/third_party/grpc/src/core/surface/channel.c
@@ -0,0 +1,327 @@
+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/core/surface/channel.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+
+#include "src/core/client_config/resolver_registry.h"
+#include "src/core/iomgr/iomgr.h"
+#include "src/core/support/string.h"
+#include "src/core/surface/api_trace.h"
+#include "src/core/surface/call.h"
+#include "src/core/surface/init.h"
+#include "src/core/transport/static_metadata.h"
+
+/** Cache grpc-status: X mdelems for X = 0..NUM_CACHED_STATUS_ELEMS.
+ *  Avoids needing to take a metadata context lock for sending status
+ *  if the status code is <= NUM_CACHED_STATUS_ELEMS.
+ *  Sized to allow the most commonly used codes to fit in
+ *  (OK, Cancelled, Unknown). */
+#define NUM_CACHED_STATUS_ELEMS 3
+
+typedef struct registered_call {
+  grpc_mdelem *path;
+  grpc_mdelem *authority;
+  struct registered_call *next;
+} registered_call;
+
+struct grpc_channel {
+  int is_client;
+  uint32_t max_message_length;
+  grpc_mdelem *default_authority;
+
+  gpr_mu registered_call_mu;
+  registered_call *registered_calls;
+  char *target;
+};
+
+#define CHANNEL_STACK_FROM_CHANNEL(c) ((grpc_channel_stack *)((c) + 1))
+#define CHANNEL_FROM_CHANNEL_STACK(channel_stack) \
+  (((grpc_channel *)(channel_stack)) - 1)
+#define CHANNEL_FROM_TOP_ELEM(top_elem) \
+  CHANNEL_FROM_CHANNEL_STACK(grpc_channel_stack_from_top_element(top_elem))
+
+/* the protobuf library will (by default) start warning at 100megs */
+#define DEFAULT_MAX_MESSAGE_LENGTH (100 * 1024 * 1024)
+
+static void destroy_channel(grpc_exec_ctx *exec_ctx, void *arg, bool success);
+
+grpc_channel *grpc_channel_create_from_filters(
+    grpc_exec_ctx *exec_ctx, const char *target,
+    const grpc_channel_filter **filters, size_t num_filters,
+    const grpc_channel_args *args, int is_client) {
+  size_t i;
+  size_t size =
+      sizeof(grpc_channel) + grpc_channel_stack_size(filters, num_filters);
+  grpc_channel *channel = gpr_malloc(size);
+  memset(channel, 0, sizeof(*channel));
+  channel->target = gpr_strdup(target);
+  GPR_ASSERT(grpc_is_initialized() && "call grpc_init()");
+  channel->is_client = is_client;
+  gpr_mu_init(&channel->registered_call_mu);
+  channel->registered_calls = NULL;
+
+  channel->max_message_length = DEFAULT_MAX_MESSAGE_LENGTH;
+  if (args) {
+    for (i = 0; i < args->num_args; i++) {
+      if (0 == strcmp(args->args[i].key, GRPC_ARG_MAX_MESSAGE_LENGTH)) {
+        if (args->args[i].type != GRPC_ARG_INTEGER) {
+          gpr_log(GPR_ERROR, "%s ignored: it must be an integer",
+                  GRPC_ARG_MAX_MESSAGE_LENGTH);
+        } else if (args->args[i].value.integer < 0) {
+          gpr_log(GPR_ERROR, "%s ignored: it must be >= 0",
+                  GRPC_ARG_MAX_MESSAGE_LENGTH);
+        } else {
+          channel->max_message_length = (uint32_t)args->args[i].value.integer;
+        }
+      } else if (0 == strcmp(args->args[i].key, GRPC_ARG_DEFAULT_AUTHORITY)) {
+        if (args->args[i].type != GRPC_ARG_STRING) {
+          gpr_log(GPR_ERROR, "%s ignored: it must be a string",
+                  GRPC_ARG_DEFAULT_AUTHORITY);
+        } else {
+          if (channel->default_authority) {
+            /* setting this takes precedence over anything else */
+            GRPC_MDELEM_UNREF(channel->default_authority);
+          }
+          channel->default_authority = grpc_mdelem_from_strings(
+              ":authority", args->args[i].value.string);
+        }
+      } else if (0 ==
+                 strcmp(args->args[i].key, GRPC_SSL_TARGET_NAME_OVERRIDE_ARG)) {
+        if (args->args[i].type != GRPC_ARG_STRING) {
+          gpr_log(GPR_ERROR, "%s ignored: it must be a string",
+                  GRPC_SSL_TARGET_NAME_OVERRIDE_ARG);
+        } else {
+          if (channel->default_authority) {
+            /* other ways of setting this (notably ssl) take precedence */
+            gpr_log(GPR_ERROR,
+                    "%s ignored: default host already set some other way",
+                    GRPC_SSL_TARGET_NAME_OVERRIDE_ARG);
+          } else {
+            channel->default_authority = grpc_mdelem_from_strings(
+                ":authority", args->args[i].value.string);
+          }
+        }
+      }
+    }
+  }
+
+  if (channel->is_client && channel->default_authority == NULL &&
+      target != NULL) {
+    char *default_authority = grpc_get_default_authority(target);
+    if (default_authority) {
+      channel->default_authority =
+          grpc_mdelem_from_strings(":authority", default_authority);
+    }
+    gpr_free(default_authority);
+  }
+
+  grpc_channel_stack_init(exec_ctx, 1, destroy_channel, channel, filters,
+                          num_filters, args,
+                          is_client ? "CLIENT_CHANNEL" : "SERVER_CHANNEL",
+                          CHANNEL_STACK_FROM_CHANNEL(channel));
+
+  return channel;
+}
+
+char *grpc_channel_get_target(grpc_channel *channel) {
+  GRPC_API_TRACE("grpc_channel_get_target(channel=%p)", 1, (channel));
+  return gpr_strdup(channel->target);
+}
+
+static grpc_call *grpc_channel_create_call_internal(
+    grpc_channel *channel, grpc_call *parent_call, uint32_t propagation_mask,
+    grpc_completion_queue *cq, grpc_mdelem *path_mdelem,
+    grpc_mdelem *authority_mdelem, gpr_timespec deadline) {
+  grpc_mdelem *send_metadata[2];
+  size_t num_metadata = 0;
+
+  GPR_ASSERT(channel->is_client);
+
+  send_metadata[num_metadata++] = path_mdelem;
+  if (authority_mdelem != NULL) {
+    send_metadata[num_metadata++] = authority_mdelem;
+  } else if (channel->default_authority != NULL) {
+    send_metadata[num_metadata++] = GRPC_MDELEM_REF(channel->default_authority);
+  }
+
+  return grpc_call_create(channel, parent_call, propagation_mask, cq, NULL,
+                          send_metadata, num_metadata, deadline);
+}
+
+grpc_call *grpc_channel_create_call(grpc_channel *channel,
+                                    grpc_call *parent_call,
+                                    uint32_t propagation_mask,
+                                    grpc_completion_queue *cq,
+                                    const char *method, const char *host,
+                                    gpr_timespec deadline, void *reserved) {
+  GRPC_API_TRACE(
+      "grpc_channel_create_call("
+      "channel=%p, parent_call=%p, propagation_mask=%x, cq=%p, method=%s, "
+      "host=%s, "
+      "deadline=gpr_timespec { tv_sec: %lld, tv_nsec: %d, clock_type: %d }, "
+      "reserved=%p)",
+      10, (channel, parent_call, (unsigned)propagation_mask, cq, method, host,
+           (long long)deadline.tv_sec, (int)deadline.tv_nsec,
+           (int)deadline.clock_type, reserved));
+  GPR_ASSERT(!reserved);
+  return grpc_channel_create_call_internal(
+      channel, parent_call, propagation_mask, cq,
+      grpc_mdelem_from_metadata_strings(GRPC_MDSTR_PATH,
+                                        grpc_mdstr_from_string(method)),
+      host ? grpc_mdelem_from_metadata_strings(GRPC_MDSTR_AUTHORITY,
+                                               grpc_mdstr_from_string(host))
+           : NULL,
+      deadline);
+}
+
+void *grpc_channel_register_call(grpc_channel *channel, const char *method,
+                                 const char *host, void *reserved) {
+  registered_call *rc = gpr_malloc(sizeof(registered_call));
+  GRPC_API_TRACE(
+      "grpc_channel_register_call(channel=%p, method=%s, host=%s, reserved=%p)",
+      4, (channel, method, host, reserved));
+  GPR_ASSERT(!reserved);
+  rc->path = grpc_mdelem_from_metadata_strings(GRPC_MDSTR_PATH,
+                                               grpc_mdstr_from_string(method));
+  rc->authority = host ? grpc_mdelem_from_metadata_strings(
+                             GRPC_MDSTR_AUTHORITY, grpc_mdstr_from_string(host))
+                       : NULL;
+  gpr_mu_lock(&channel->registered_call_mu);
+  rc->next = channel->registered_calls;
+  channel->registered_calls = rc;
+  gpr_mu_unlock(&channel->registered_call_mu);
+  return rc;
+}
+
+grpc_call *grpc_channel_create_registered_call(
+    grpc_channel *channel, grpc_call *parent_call, uint32_t propagation_mask,
+    grpc_completion_queue *completion_queue, void *registered_call_handle,
+    gpr_timespec deadline, void *reserved) {
+  registered_call *rc = registered_call_handle;
+  GRPC_API_TRACE(
+      "grpc_channel_create_registered_call("
+      "channel=%p, parent_call=%p, propagation_mask=%x, completion_queue=%p, "
+      "registered_call_handle=%p, "
+      "deadline=gpr_timespec { tv_sec: %lld, tv_nsec: %d, clock_type: %d }, "
+      "reserved=%p)",
+      9, (channel, parent_call, (unsigned)propagation_mask, completion_queue,
+          registered_call_handle, (long long)deadline.tv_sec,
+          (int)deadline.tv_nsec, (int)deadline.clock_type, reserved));
+  GPR_ASSERT(!reserved);
+  return grpc_channel_create_call_internal(
+      channel, parent_call, propagation_mask, completion_queue,
+      GRPC_MDELEM_REF(rc->path),
+      rc->authority ? GRPC_MDELEM_REF(rc->authority) : NULL, deadline);
+}
+
+#ifdef GRPC_STREAM_REFCOUNT_DEBUG
+#define REF_REASON reason
+#define REF_ARG , const char *reason
+#else
+#define REF_REASON ""
+#define REF_ARG
+#endif
+void grpc_channel_internal_ref(grpc_channel *c REF_ARG) {
+  GRPC_CHANNEL_STACK_REF(CHANNEL_STACK_FROM_CHANNEL(c), REF_REASON);
+}
+
+void grpc_channel_internal_unref(grpc_exec_ctx *exec_ctx,
+                                 grpc_channel *c REF_ARG) {
+  GRPC_CHANNEL_STACK_UNREF(exec_ctx, CHANNEL_STACK_FROM_CHANNEL(c), REF_REASON);
+}
+
+static void destroy_channel(grpc_exec_ctx *exec_ctx, void *arg,
+                            bool iomgr_success) {
+  grpc_channel *channel = arg;
+  grpc_channel_stack_destroy(exec_ctx, CHANNEL_STACK_FROM_CHANNEL(channel));
+  while (channel->registered_calls) {
+    registered_call *rc = channel->registered_calls;
+    channel->registered_calls = rc->next;
+    GRPC_MDELEM_UNREF(rc->path);
+    if (rc->authority) {
+      GRPC_MDELEM_UNREF(rc->authority);
+    }
+    gpr_free(rc);
+  }
+  if (channel->default_authority != NULL) {
+    GRPC_MDELEM_UNREF(channel->default_authority);
+  }
+  gpr_mu_destroy(&channel->registered_call_mu);
+  gpr_free(channel->target);
+  gpr_free(channel);
+}
+
+void grpc_channel_destroy(grpc_channel *channel) {
+  grpc_transport_op op;
+  grpc_channel_element *elem;
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  GRPC_API_TRACE("grpc_channel_destroy(channel=%p)", 1, (channel));
+  memset(&op, 0, sizeof(op));
+  op.disconnect = 1;
+  elem = grpc_channel_stack_element(CHANNEL_STACK_FROM_CHANNEL(channel), 0);
+  elem->filter->start_transport_op(&exec_ctx, elem, &op);
+
+  GRPC_CHANNEL_INTERNAL_UNREF(&exec_ctx, channel, "channel");
+
+  grpc_exec_ctx_finish(&exec_ctx);
+}
+
+grpc_channel_stack *grpc_channel_get_channel_stack(grpc_channel *channel) {
+  return CHANNEL_STACK_FROM_CHANNEL(channel);
+}
+
+grpc_mdelem *grpc_channel_get_reffed_status_elem(grpc_channel *channel, int i) {
+  char tmp[GPR_LTOA_MIN_BUFSIZE];
+  switch (i) {
+    case 0:
+      return GRPC_MDELEM_GRPC_STATUS_0;
+    case 1:
+      return GRPC_MDELEM_GRPC_STATUS_1;
+    case 2:
+      return GRPC_MDELEM_GRPC_STATUS_2;
+  }
+  gpr_ltoa(i, tmp);
+  return grpc_mdelem_from_metadata_strings(GRPC_MDSTR_GRPC_STATUS,
+                                           grpc_mdstr_from_string(tmp));
+}
+
+uint32_t grpc_channel_get_max_message_length(grpc_channel *channel) {
+  return channel->max_message_length;
+}