Merge branch 'master' into fix-php

1 files changed, 381 insertions, 0 deletions

diff --git a/src/core/lib/iomgr/tcp_uv.cc b/src/core/lib/iomgr/tcp_uv.cc
new file mode 100644
index 0000000000..e311964dbc
--- /dev/null
+++ b/src/core/lib/iomgr/tcp_uv.cc
@@ -0,0 +1,381 @@
+/*
+ *
+ * Copyright 2016 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 "src/core/lib/iomgr/port.h"
+
+#ifdef GRPC_UV
+
+#include <limits.h>
+#include <string.h>
+
+#include <grpc/slice_buffer.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/string_util.h>
+
+#include "src/core/lib/iomgr/error.h"
+#include "src/core/lib/iomgr/iomgr_uv.h"
+#include "src/core/lib/iomgr/network_status_tracker.h"
+#include "src/core/lib/iomgr/resource_quota.h"
+#include "src/core/lib/iomgr/tcp_uv.h"
+#include "src/core/lib/slice/slice_internal.h"
+#include "src/core/lib/slice/slice_string_helpers.h"
+#include "src/core/lib/support/string.h"
+
+grpc_tracer_flag grpc_tcp_trace = GRPC_TRACER_INITIALIZER(false, "tcp");
+
+typedef struct {
+  grpc_endpoint base;
+  gpr_refcount refcount;
+
+  uv_write_t write_req;
+  uv_shutdown_t shutdown_req;
+
+  uv_tcp_t *handle;
+
+  grpc_closure *read_cb;
+  grpc_closure *write_cb;
+
+  grpc_slice read_slice;
+  grpc_slice_buffer *read_slices;
+  grpc_slice_buffer *write_slices;
+  uv_buf_t *write_buffers;
+
+  grpc_resource_user *resource_user;
+
+  bool shutting_down;
+
+  char *peer_string;
+  grpc_pollset *pollset;
+} grpc_tcp;
+
+static void tcp_free(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp) {
+  grpc_slice_unref_internal(exec_ctx, tcp->read_slice);
+  grpc_resource_user_unref(exec_ctx, tcp->resource_user);
+  gpr_free(tcp->handle);
+  gpr_free(tcp->peer_string);
+  gpr_free(tcp);
+}
+
+#ifndef NDEBUG
+#define TCP_UNREF(exec_ctx, tcp, reason) \
+  tcp_unref((exec_ctx), (tcp), (reason), __FILE__, __LINE__)
+#define TCP_REF(tcp, reason) tcp_ref((tcp), (reason), __FILE__, __LINE__)
+static void tcp_unref(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp,
+                      const char *reason, const char *file, int line) {
+  if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+    gpr_atm val = gpr_atm_no_barrier_load(&tcp->refcount.count);
+    gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG,
+            "TCP unref %p : %s %" PRIdPTR " -> %" PRIdPTR, tcp, reason, val,
+            val - 1);
+  }
+  if (gpr_unref(&tcp->refcount)) {
+    tcp_free(exec_ctx, tcp);
+  }
+}
+
+static void tcp_ref(grpc_tcp *tcp, const char *reason, const char *file,
+                    int line) {
+  if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+    gpr_atm val = gpr_atm_no_barrier_load(&tcp->refcount.count);
+    gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG,
+            "TCP   ref %p : %s %" PRIdPTR " -> %" PRIdPTR, tcp, reason, val,
+            val + 1);
+  }
+  gpr_ref(&tcp->refcount);
+}
+#else
+#define TCP_UNREF(exec_ctx, tcp, reason) tcp_unref((exec_ctx), (tcp))
+#define TCP_REF(tcp, reason) tcp_ref((tcp))
+static void tcp_unref(grpc_exec_ctx *exec_ctx, grpc_tcp *tcp) {
+  if (gpr_unref(&tcp->refcount)) {
+    tcp_free(exec_ctx, tcp);
+  }
+}
+
+static void tcp_ref(grpc_tcp *tcp) { gpr_ref(&tcp->refcount); }
+#endif
+
+static void uv_close_callback(uv_handle_t *handle) {
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_tcp *tcp = (grpc_tcp *)handle->data;
+  TCP_UNREF(&exec_ctx, tcp, "destroy");
+  grpc_exec_ctx_finish(&exec_ctx);
+}
+
+static grpc_slice alloc_read_slice(grpc_exec_ctx *exec_ctx,
+                                   grpc_resource_user *resource_user) {
+  return grpc_resource_user_slice_malloc(exec_ctx, resource_user,
+                                         GRPC_TCP_DEFAULT_READ_SLICE_SIZE);
+}
+
+static void alloc_uv_buf(uv_handle_t *handle, size_t suggested_size,
+                         uv_buf_t *buf) {
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_tcp *tcp = (grpc_tcp *)handle->data;
+  (void)suggested_size;
+  buf->base = (char *)GRPC_SLICE_START_PTR(tcp->read_slice);
+  buf->len = GRPC_SLICE_LENGTH(tcp->read_slice);
+  grpc_exec_ctx_finish(&exec_ctx);
+}
+
+static void read_callback(uv_stream_t *stream, ssize_t nread,
+                          const uv_buf_t *buf) {
+  grpc_slice sub;
+  grpc_error *error;
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_tcp *tcp = (grpc_tcp *)stream->data;
+  grpc_closure *cb = tcp->read_cb;
+  if (nread == 0) {
+    // Nothing happened. Wait for the next callback
+    return;
+  }
+  TCP_UNREF(&exec_ctx, tcp, "read");
+  tcp->read_cb = NULL;
+  // TODO(murgatroid99): figure out what the return value here means
+  uv_read_stop(stream);
+  if (nread == UV_EOF) {
+    error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("EOF");
+  } else if (nread > 0) {
+    // Successful read
+    sub = grpc_slice_sub_no_ref(tcp->read_slice, 0, (size_t)nread);
+    grpc_slice_buffer_add(tcp->read_slices, sub);
+    tcp->read_slice = alloc_read_slice(&exec_ctx, tcp->resource_user);
+    error = GRPC_ERROR_NONE;
+    if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+      size_t i;
+      const char *str = grpc_error_string(error);
+      gpr_log(GPR_DEBUG, "read: error=%s", str);
+
+      for (i = 0; i < tcp->read_slices->count; i++) {
+        char *dump = grpc_dump_slice(tcp->read_slices->slices[i],
+                                     GPR_DUMP_HEX | GPR_DUMP_ASCII);
+        gpr_log(GPR_DEBUG, "READ %p (peer=%s): %s", tcp, tcp->peer_string,
+                dump);
+        gpr_free(dump);
+      }
+    }
+  } else {
+    // nread < 0: Error
+    error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("TCP Read failed");
+  }
+  GRPC_CLOSURE_SCHED(&exec_ctx, cb, error);
+  grpc_exec_ctx_finish(&exec_ctx);
+}
+
+static void uv_endpoint_read(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
+                             grpc_slice_buffer *read_slices, grpc_closure *cb) {
+  grpc_tcp *tcp = (grpc_tcp *)ep;
+  int status;
+  grpc_error *error = GRPC_ERROR_NONE;
+  GRPC_UV_ASSERT_SAME_THREAD();
+  GPR_ASSERT(tcp->read_cb == NULL);
+  tcp->read_cb = cb;
+  tcp->read_slices = read_slices;
+  grpc_slice_buffer_reset_and_unref_internal(exec_ctx, read_slices);
+  TCP_REF(tcp, "read");
+  // TODO(murgatroid99): figure out what the return value here means
+  status =
+      uv_read_start((uv_stream_t *)tcp->handle, alloc_uv_buf, read_callback);
+  if (status != 0) {
+    error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("TCP Read failed at start");
+    error =
+        grpc_error_set_str(error, GRPC_ERROR_STR_OS_ERROR,
+                           grpc_slice_from_static_string(uv_strerror(status)));
+    GRPC_CLOSURE_SCHED(exec_ctx, cb, error);
+  }
+  if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+    const char *str = grpc_error_string(error);
+    gpr_log(GPR_DEBUG, "Initiating read on %p: error=%s", tcp, str);
+  }
+}
+
+static void write_callback(uv_write_t *req, int status) {
+  grpc_tcp *tcp = (grpc_tcp *)req->data;
+  grpc_error *error;
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_closure *cb = tcp->write_cb;
+  tcp->write_cb = NULL;
+  TCP_UNREF(&exec_ctx, tcp, "write");
+  if (status == 0) {
+    error = GRPC_ERROR_NONE;
+  } else {
+    error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("TCP Write failed");
+  }
+  if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+    const char *str = grpc_error_string(error);
+    gpr_log(GPR_DEBUG, "write complete on %p: error=%s", tcp, str);
+  }
+  gpr_free(tcp->write_buffers);
+  grpc_resource_user_free(&exec_ctx, tcp->resource_user,
+                          sizeof(uv_buf_t) * tcp->write_slices->count);
+  GRPC_CLOSURE_SCHED(&exec_ctx, cb, error);
+  grpc_exec_ctx_finish(&exec_ctx);
+}
+
+static void uv_endpoint_write(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
+                              grpc_slice_buffer *write_slices,
+                              grpc_closure *cb) {
+  grpc_tcp *tcp = (grpc_tcp *)ep;
+  uv_buf_t *buffers;
+  unsigned int buffer_count;
+  unsigned int i;
+  grpc_slice *slice;
+  uv_write_t *write_req;
+  GRPC_UV_ASSERT_SAME_THREAD();
+
+  if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+    size_t j;
+
+    for (j = 0; j < write_slices->count; j++) {
+      char *data = grpc_dump_slice(write_slices->slices[j],
+                                   GPR_DUMP_HEX | GPR_DUMP_ASCII);
+      gpr_log(GPR_DEBUG, "WRITE %p (peer=%s): %s", tcp, tcp->peer_string, data);
+      gpr_free(data);
+    }
+  }
+
+  if (tcp->shutting_down) {
+    GRPC_CLOSURE_SCHED(exec_ctx, cb, GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+                                         "TCP socket is shutting down"));
+    return;
+  }
+
+  GPR_ASSERT(tcp->write_cb == NULL);
+  tcp->write_slices = write_slices;
+  GPR_ASSERT(tcp->write_slices->count <= UINT_MAX);
+  if (tcp->write_slices->count == 0) {
+    // No slices means we don't have to do anything,
+    // and libuv doesn't like empty writes
+    GRPC_CLOSURE_SCHED(exec_ctx, cb, GRPC_ERROR_NONE);
+    return;
+  }
+
+  tcp->write_cb = cb;
+  buffer_count = (unsigned int)tcp->write_slices->count;
+  buffers = (uv_buf_t *)gpr_malloc(sizeof(uv_buf_t) * buffer_count);
+  grpc_resource_user_alloc(exec_ctx, tcp->resource_user,
+                           sizeof(uv_buf_t) * buffer_count, NULL);
+  for (i = 0; i < buffer_count; i++) {
+    slice = &tcp->write_slices->slices[i];
+    buffers[i].base = (char *)GRPC_SLICE_START_PTR(*slice);
+    buffers[i].len = GRPC_SLICE_LENGTH(*slice);
+  }
+  tcp->write_buffers = buffers;
+  write_req = &tcp->write_req;
+  write_req->data = tcp;
+  TCP_REF(tcp, "write");
+  // TODO(murgatroid99): figure out what the return value here means
+  uv_write(write_req, (uv_stream_t *)tcp->handle, buffers, buffer_count,
+           write_callback);
+}
+
+static void uv_add_to_pollset(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
+                              grpc_pollset *pollset) {
+  // No-op. We're ignoring pollsets currently
+  (void)exec_ctx;
+  (void)ep;
+  (void)pollset;
+  grpc_tcp *tcp = (grpc_tcp *)ep;
+  tcp->pollset = pollset;
+}
+
+static void uv_add_to_pollset_set(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
+                                  grpc_pollset_set *pollset) {
+  // No-op. We're ignoring pollsets currently
+  (void)exec_ctx;
+  (void)ep;
+  (void)pollset;
+}
+
+static void shutdown_callback(uv_shutdown_t *req, int status) {}
+
+static void uv_endpoint_shutdown(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep,
+                                 grpc_error *why) {
+  grpc_tcp *tcp = (grpc_tcp *)ep;
+  if (!tcp->shutting_down) {
+    if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+      const char *str = grpc_error_string(why);
+      gpr_log(GPR_DEBUG, "TCP %p shutdown why=%s", tcp->handle, str);
+    }
+    tcp->shutting_down = true;
+    uv_shutdown_t *req = &tcp->shutdown_req;
+    uv_shutdown(req, (uv_stream_t *)tcp->handle, shutdown_callback);
+    grpc_resource_user_shutdown(exec_ctx, tcp->resource_user);
+  }
+  GRPC_ERROR_UNREF(why);
+}
+
+static void uv_destroy(grpc_exec_ctx *exec_ctx, grpc_endpoint *ep) {
+  grpc_network_status_unregister_endpoint(ep);
+  grpc_tcp *tcp = (grpc_tcp *)ep;
+  uv_close((uv_handle_t *)tcp->handle, uv_close_callback);
+}
+
+static char *uv_get_peer(grpc_endpoint *ep) {
+  grpc_tcp *tcp = (grpc_tcp *)ep;
+  return gpr_strdup(tcp->peer_string);
+}
+
+static grpc_resource_user *uv_get_resource_user(grpc_endpoint *ep) {
+  grpc_tcp *tcp = (grpc_tcp *)ep;
+  return tcp->resource_user;
+}
+
+static int uv_get_fd(grpc_endpoint *ep) { return -1; }
+
+static grpc_endpoint_vtable vtable = {
+    uv_endpoint_read,      uv_endpoint_write,    uv_add_to_pollset,
+    uv_add_to_pollset_set, uv_endpoint_shutdown, uv_destroy,
+    uv_get_resource_user,  uv_get_peer,          uv_get_fd};
+
+grpc_endpoint *grpc_tcp_create(uv_tcp_t *handle,
+                               grpc_resource_quota *resource_quota,
+                               char *peer_string) {
+  grpc_tcp *tcp = (grpc_tcp *)gpr_malloc(sizeof(grpc_tcp));
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+
+  if (GRPC_TRACER_ON(grpc_tcp_trace)) {
+    gpr_log(GPR_DEBUG, "Creating TCP endpoint %p", tcp);
+  }
+
+  /* Disable Nagle's Algorithm */
+  uv_tcp_nodelay(handle, 1);
+
+  memset(tcp, 0, sizeof(grpc_tcp));
+  tcp->base.vtable = &vtable;
+  tcp->handle = handle;
+  handle->data = tcp;
+  gpr_ref_init(&tcp->refcount, 1);
+  tcp->peer_string = gpr_strdup(peer_string);
+  tcp->shutting_down = false;
+  tcp->resource_user = grpc_resource_user_create(resource_quota, peer_string);
+  tcp->read_slice = alloc_read_slice(&exec_ctx, tcp->resource_user);
+  /* Tell network status tracking code about the new endpoint */
+  grpc_network_status_register_endpoint(&tcp->base);
+
+#ifndef GRPC_UV_TCP_HOLD_LOOP
+  uv_unref((uv_handle_t *)handle);
+#endif
+
+  grpc_exec_ctx_finish(&exec_ctx);
+  return &tcp->base;
+}
+
+#endif /* GRPC_UV */