| /* |
| * |
| * 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; |
| } |
