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Diffstat (limited to 'src/core/lib/surface/call.c')
| -rw-r--r-- | src/core/lib/surface/call.c | 1491 |
1 files changed, 1491 insertions, 0 deletions
diff --git a/src/core/lib/surface/call.c b/src/core/lib/surface/call.c new file mode 100644 index 0000000000..d63a4a7401 --- /dev/null +++ b/src/core/lib/surface/call.c @@ -0,0 +1,1491 @@ +/* + * + * 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 <assert.h> +#include <limits.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <grpc/compression.h> +#include <grpc/grpc.h> +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> +#include <grpc/support/string_util.h> +#include <grpc/support/useful.h> + +#include "src/core/lib/channel/channel_stack.h" +#include "src/core/lib/compression/algorithm_metadata.h" +#include "src/core/lib/iomgr/timer.h" +#include "src/core/lib/profiling/timers.h" +#include "src/core/lib/support/string.h" +#include "src/core/lib/surface/api_trace.h" +#include "src/core/lib/surface/call.h" +#include "src/core/lib/surface/channel.h" +#include "src/core/lib/surface/completion_queue.h" +#include "src/core/lib/transport/static_metadata.h" + +/** The maximum number of concurrent batches possible. + Based upon the maximum number of individually queueable ops in the batch + api: + - initial metadata send + - message send + - status/close send (depending on client/server) + - initial metadata recv + - message recv + - status/close recv (depending on client/server) */ +#define MAX_CONCURRENT_BATCHES 6 + +typedef struct { + grpc_ioreq_completion_func on_complete; + void *user_data; + int success; +} completed_request; + +#define MAX_SEND_EXTRA_METADATA_COUNT 3 + +/* Status data for a request can come from several sources; this + enumerates them all, and acts as a priority sorting for which + status to return to the application - earlier entries override + later ones */ +typedef enum { + /* Status came from the application layer overriding whatever + the wire says */ + STATUS_FROM_API_OVERRIDE = 0, + /* Status was created by some internal channel stack operation */ + STATUS_FROM_CORE, + /* Status came from 'the wire' - or somewhere below the surface + layer */ + STATUS_FROM_WIRE, + /* Status came from the server sending status */ + STATUS_FROM_SERVER_STATUS, + STATUS_SOURCE_COUNT +} status_source; + +typedef struct { + uint8_t is_set; + grpc_status_code code; + grpc_mdstr *details; +} received_status; + +/* How far through the GRPC stream have we read? */ +typedef enum { + /* We are still waiting for initial metadata to complete */ + READ_STATE_INITIAL = 0, + /* We have gotten initial metadata, and are reading either + messages or trailing metadata */ + READ_STATE_GOT_INITIAL_METADATA, + /* The stream is closed for reading */ + READ_STATE_READ_CLOSED, + /* The stream is closed for reading & writing */ + READ_STATE_STREAM_CLOSED +} read_state; + +typedef enum { + WRITE_STATE_INITIAL = 0, + WRITE_STATE_STARTED, + WRITE_STATE_WRITE_CLOSED +} write_state; + +typedef struct batch_control { + grpc_call *call; + grpc_cq_completion cq_completion; + grpc_closure finish_batch; + void *notify_tag; + gpr_refcount steps_to_complete; + + uint8_t send_initial_metadata; + uint8_t send_message; + uint8_t send_final_op; + uint8_t recv_initial_metadata; + uint8_t recv_message; + uint8_t recv_final_op; + uint8_t is_notify_tag_closure; + uint8_t success; +} batch_control; + +struct grpc_call { + grpc_completion_queue *cq; + grpc_channel *channel; + grpc_call *parent; + grpc_call *first_child; + /* TODO(ctiller): share with cq if possible? */ + gpr_mu mu; + + /* client or server call */ + uint8_t is_client; + /* is the alarm set */ + uint8_t have_alarm; + /** has grpc_call_destroy been called */ + uint8_t destroy_called; + /** flag indicating that cancellation is inherited */ + uint8_t cancellation_is_inherited; + /** bitmask of live batches */ + uint8_t used_batches; + /** which ops are in-flight */ + uint8_t sent_initial_metadata; + uint8_t sending_message; + uint8_t sent_final_op; + uint8_t received_initial_metadata; + uint8_t receiving_message; + uint8_t received_final_op; + + /* have we received initial metadata */ + bool has_initial_md_been_received; + + batch_control active_batches[MAX_CONCURRENT_BATCHES]; + + /* first idx: is_receiving, second idx: is_trailing */ + grpc_metadata_batch metadata_batch[2][2]; + + /* Buffered read metadata waiting to be returned to the application. + Element 0 is initial metadata, element 1 is trailing metadata. */ + grpc_metadata_array *buffered_metadata[2]; + + /* Received call statuses from various sources */ + received_status status[STATUS_SOURCE_COUNT]; + + /* Compression algorithm for the call */ + grpc_compression_algorithm compression_algorithm; + /* Supported encodings (compression algorithms), a bitset */ + uint32_t encodings_accepted_by_peer; + + /* Contexts for various subsystems (security, tracing, ...). */ + grpc_call_context_element context[GRPC_CONTEXT_COUNT]; + + /* Deadline alarm - if have_alarm is non-zero */ + grpc_timer alarm; + + /* for the client, extra metadata is initial metadata; for the + server, it's trailing metadata */ + grpc_linked_mdelem send_extra_metadata[MAX_SEND_EXTRA_METADATA_COUNT]; + int send_extra_metadata_count; + gpr_timespec send_deadline; + + /** siblings: children of the same parent form a list, and this list is + protected under + parent->mu */ + grpc_call *sibling_next; + grpc_call *sibling_prev; + + grpc_slice_buffer_stream sending_stream; + grpc_byte_stream *receiving_stream; + grpc_byte_buffer **receiving_buffer; + gpr_slice receiving_slice; + grpc_closure receiving_slice_ready; + grpc_closure receiving_stream_ready; + grpc_closure receiving_initial_metadata_ready; + uint32_t test_only_last_message_flags; + + union { + struct { + grpc_status_code *status; + char **status_details; + size_t *status_details_capacity; + } client; + struct { + int *cancelled; + } server; + } final_op; + + struct { + void *bctlp; + bool success; + } saved_receiving_stream_ready_ctx; +}; + +#define CALL_STACK_FROM_CALL(call) ((grpc_call_stack *)((call) + 1)) +#define CALL_FROM_CALL_STACK(call_stack) (((grpc_call *)(call_stack)) - 1) +#define CALL_ELEM_FROM_CALL(call, idx) \ + grpc_call_stack_element(CALL_STACK_FROM_CALL(call), idx) +#define CALL_FROM_TOP_ELEM(top_elem) \ + CALL_FROM_CALL_STACK(grpc_call_stack_from_top_element(top_elem)) + +static void set_deadline_alarm(grpc_exec_ctx *exec_ctx, grpc_call *call, + gpr_timespec deadline); +static void execute_op(grpc_exec_ctx *exec_ctx, grpc_call *call, + grpc_transport_stream_op *op); +static grpc_call_error cancel_with_status(grpc_exec_ctx *exec_ctx, grpc_call *c, + grpc_status_code status, + const char *description); +static void destroy_call(grpc_exec_ctx *exec_ctx, void *call_stack, + bool success); +static void receiving_slice_ready(grpc_exec_ctx *exec_ctx, void *bctlp, + bool success); + +grpc_call *grpc_call_create(grpc_channel *channel, grpc_call *parent_call, + uint32_t propagation_mask, + grpc_completion_queue *cq, + const void *server_transport_data, + grpc_mdelem **add_initial_metadata, + size_t add_initial_metadata_count, + gpr_timespec send_deadline) { + size_t i, j; + grpc_channel_stack *channel_stack = grpc_channel_get_channel_stack(channel); + grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; + grpc_call *call; + GPR_TIMER_BEGIN("grpc_call_create", 0); + call = gpr_malloc(sizeof(grpc_call) + channel_stack->call_stack_size); + memset(call, 0, sizeof(grpc_call)); + gpr_mu_init(&call->mu); + call->channel = channel; + call->cq = cq; + call->parent = parent_call; + call->is_client = server_transport_data == NULL; + if (call->is_client) { + GPR_ASSERT(add_initial_metadata_count < MAX_SEND_EXTRA_METADATA_COUNT); + for (i = 0; i < add_initial_metadata_count; i++) { + call->send_extra_metadata[i].md = add_initial_metadata[i]; + } + call->send_extra_metadata_count = (int)add_initial_metadata_count; + } else { + GPR_ASSERT(add_initial_metadata_count == 0); + call->send_extra_metadata_count = 0; + } + for (i = 0; i < 2; i++) { + for (j = 0; j < 2; j++) { + call->metadata_batch[i][j].deadline = gpr_inf_future(GPR_CLOCK_MONOTONIC); + } + } + call->send_deadline = send_deadline; + GRPC_CHANNEL_INTERNAL_REF(channel, "call"); + /* initial refcount dropped by grpc_call_destroy */ + grpc_call_stack_init(&exec_ctx, channel_stack, 1, destroy_call, call, + call->context, server_transport_data, + CALL_STACK_FROM_CALL(call)); + if (cq != NULL) { + GRPC_CQ_INTERNAL_REF(cq, "bind"); + grpc_call_stack_set_pollset(&exec_ctx, CALL_STACK_FROM_CALL(call), + grpc_cq_pollset(cq)); + } + if (parent_call != NULL) { + GRPC_CALL_INTERNAL_REF(parent_call, "child"); + GPR_ASSERT(call->is_client); + GPR_ASSERT(!parent_call->is_client); + + gpr_mu_lock(&parent_call->mu); + + if (propagation_mask & GRPC_PROPAGATE_DEADLINE) { + send_deadline = gpr_time_min( + gpr_convert_clock_type(send_deadline, + parent_call->send_deadline.clock_type), + parent_call->send_deadline); + } + /* for now GRPC_PROPAGATE_TRACING_CONTEXT *MUST* be passed with + * GRPC_PROPAGATE_STATS_CONTEXT */ + /* TODO(ctiller): This should change to use the appropriate census start_op + * call. */ + if (propagation_mask & GRPC_PROPAGATE_CENSUS_TRACING_CONTEXT) { + GPR_ASSERT(propagation_mask & GRPC_PROPAGATE_CENSUS_STATS_CONTEXT); + grpc_call_context_set(call, GRPC_CONTEXT_TRACING, + parent_call->context[GRPC_CONTEXT_TRACING].value, + NULL); + } else { + GPR_ASSERT(propagation_mask & GRPC_PROPAGATE_CENSUS_STATS_CONTEXT); + } + if (propagation_mask & GRPC_PROPAGATE_CANCELLATION) { + call->cancellation_is_inherited = 1; + } + + if (parent_call->first_child == NULL) { + parent_call->first_child = call; + call->sibling_next = call->sibling_prev = call; + } else { + call->sibling_next = parent_call->first_child; + call->sibling_prev = parent_call->first_child->sibling_prev; + call->sibling_next->sibling_prev = call->sibling_prev->sibling_next = + call; + } + + gpr_mu_unlock(&parent_call->mu); + } + if (gpr_time_cmp(send_deadline, gpr_inf_future(send_deadline.clock_type)) != + 0) { + set_deadline_alarm(&exec_ctx, call, send_deadline); + } + grpc_exec_ctx_finish(&exec_ctx); + GPR_TIMER_END("grpc_call_create", 0); + return call; +} + +void grpc_call_set_completion_queue(grpc_exec_ctx *exec_ctx, grpc_call *call, + grpc_completion_queue *cq) { + GPR_ASSERT(cq); + call->cq = cq; + GRPC_CQ_INTERNAL_REF(cq, "bind"); + grpc_call_stack_set_pollset(exec_ctx, CALL_STACK_FROM_CALL(call), + grpc_cq_pollset(cq)); +} + +#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_call_internal_ref(grpc_call *c REF_ARG) { + GRPC_CALL_STACK_REF(CALL_STACK_FROM_CALL(c), REF_REASON); +} +void grpc_call_internal_unref(grpc_exec_ctx *exec_ctx, grpc_call *c REF_ARG) { + GRPC_CALL_STACK_UNREF(exec_ctx, CALL_STACK_FROM_CALL(c), REF_REASON); +} + +static void destroy_call(grpc_exec_ctx *exec_ctx, void *call, bool success) { + size_t i; + int ii; + grpc_call *c = call; + GPR_TIMER_BEGIN("destroy_call", 0); + for (i = 0; i < 2; i++) { + grpc_metadata_batch_destroy( + &c->metadata_batch[1 /* is_receiving */][i /* is_initial */]); + } + if (c->receiving_stream != NULL) { + grpc_byte_stream_destroy(exec_ctx, c->receiving_stream); + } + grpc_call_stack_destroy(exec_ctx, CALL_STACK_FROM_CALL(c)); + GRPC_CHANNEL_INTERNAL_UNREF(exec_ctx, c->channel, "call"); + gpr_mu_destroy(&c->mu); + for (i = 0; i < STATUS_SOURCE_COUNT; i++) { + if (c->status[i].details) { + GRPC_MDSTR_UNREF(c->status[i].details); + } + } + for (ii = 0; ii < c->send_extra_metadata_count; ii++) { + GRPC_MDELEM_UNREF(c->send_extra_metadata[ii].md); + } + for (i = 0; i < GRPC_CONTEXT_COUNT; i++) { + if (c->context[i].destroy) { + c->context[i].destroy(c->context[i].value); + } + } + if (c->cq) { + GRPC_CQ_INTERNAL_UNREF(c->cq, "bind"); + } + gpr_free(c); + GPR_TIMER_END("destroy_call", 0); +} + +static void set_status_code(grpc_call *call, status_source source, + uint32_t status) { + if (call->status[source].is_set) return; + + call->status[source].is_set = 1; + call->status[source].code = (grpc_status_code)status; + + /* TODO(ctiller): what to do about the flush that was previously here */ +} + +static void set_compression_algorithm(grpc_call *call, + grpc_compression_algorithm algo) { + call->compression_algorithm = algo; +} + +grpc_compression_algorithm grpc_call_test_only_get_compression_algorithm( + grpc_call *call) { + grpc_compression_algorithm algorithm; + gpr_mu_lock(&call->mu); + algorithm = call->compression_algorithm; + gpr_mu_unlock(&call->mu); + return algorithm; +} + +uint32_t grpc_call_test_only_get_message_flags(grpc_call *call) { + uint32_t flags; + gpr_mu_lock(&call->mu); + flags = call->test_only_last_message_flags; + gpr_mu_unlock(&call->mu); + return flags; +} + +static void destroy_encodings_accepted_by_peer(void *p) { return; } + +static void set_encodings_accepted_by_peer(grpc_call *call, grpc_mdelem *mdel) { + size_t i; + grpc_compression_algorithm algorithm; + gpr_slice_buffer accept_encoding_parts; + gpr_slice accept_encoding_slice; + void *accepted_user_data; + + accepted_user_data = + grpc_mdelem_get_user_data(mdel, destroy_encodings_accepted_by_peer); + if (accepted_user_data != NULL) { + call->encodings_accepted_by_peer = + (uint32_t)(((uintptr_t)accepted_user_data) - 1); + return; + } + + accept_encoding_slice = mdel->value->slice; + gpr_slice_buffer_init(&accept_encoding_parts); + gpr_slice_split(accept_encoding_slice, ",", &accept_encoding_parts); + + /* No need to zero call->encodings_accepted_by_peer: grpc_call_create already + * zeroes the whole grpc_call */ + /* Always support no compression */ + GPR_BITSET(&call->encodings_accepted_by_peer, GRPC_COMPRESS_NONE); + for (i = 0; i < accept_encoding_parts.count; i++) { + const gpr_slice *accept_encoding_entry_slice = + &accept_encoding_parts.slices[i]; + if (grpc_compression_algorithm_parse( + (const char *)GPR_SLICE_START_PTR(*accept_encoding_entry_slice), + GPR_SLICE_LENGTH(*accept_encoding_entry_slice), &algorithm)) { + GPR_BITSET(&call->encodings_accepted_by_peer, algorithm); + } else { + char *accept_encoding_entry_str = + gpr_dump_slice(*accept_encoding_entry_slice, GPR_DUMP_ASCII); + gpr_log(GPR_ERROR, + "Invalid entry in accept encoding metadata: '%s'. Ignoring.", + accept_encoding_entry_str); + gpr_free(accept_encoding_entry_str); + } + } + + gpr_slice_buffer_destroy(&accept_encoding_parts); + + grpc_mdelem_set_user_data( + mdel, destroy_encodings_accepted_by_peer, + (void *)(((uintptr_t)call->encodings_accepted_by_peer) + 1)); +} + +uint32_t grpc_call_test_only_get_encodings_accepted_by_peer(grpc_call *call) { + uint32_t encodings_accepted_by_peer; + gpr_mu_lock(&call->mu); + encodings_accepted_by_peer = call->encodings_accepted_by_peer; + gpr_mu_unlock(&call->mu); + return encodings_accepted_by_peer; +} + +static void set_status_details(grpc_call *call, status_source source, + grpc_mdstr *status) { + if (call->status[source].details != NULL) { + GRPC_MDSTR_UNREF(call->status[source].details); + } + call->status[source].details = status; +} + +static void get_final_status(grpc_call *call, + void (*set_value)(grpc_status_code code, + void *user_data), + void *set_value_user_data) { + int i; + for (i = 0; i < STATUS_SOURCE_COUNT; i++) { + if (call->status[i].is_set) { + set_value(call->status[i].code, set_value_user_data); + return; + } + } + if (call->is_client) { + set_value(GRPC_STATUS_UNKNOWN, set_value_user_data); + } else { + set_value(GRPC_STATUS_OK, set_value_user_data); + } +} + +static void get_final_details(grpc_call *call, char **out_details, + size_t *out_details_capacity) { + int i; + for (i = 0; i < STATUS_SOURCE_COUNT; i++) { + if (call->status[i].is_set) { + if (call->status[i].details) { + gpr_slice details = call->status[i].details->slice; + size_t len = GPR_SLICE_LENGTH(details); + if (len + 1 > *out_details_capacity) { + *out_details_capacity = + GPR_MAX(len + 1, *out_details_capacity * 3 / 2); + *out_details = gpr_realloc(*out_details, *out_details_capacity); + } + memcpy(*out_details, GPR_SLICE_START_PTR(details), len); + (*out_details)[len] = 0; + } else { + goto no_details; + } + return; + } + } + +no_details: + if (0 == *out_details_capacity) { + *out_details_capacity = 8; + *out_details = gpr_malloc(*out_details_capacity); + } + **out_details = 0; +} + +static grpc_linked_mdelem *linked_from_md(grpc_metadata *md) { + return (grpc_linked_mdelem *)&md->internal_data; +} + +static int prepare_application_metadata(grpc_call *call, int count, + grpc_metadata *metadata, + int is_trailing, + int prepend_extra_metadata) { + int i; + grpc_metadata_batch *batch = + &call->metadata_batch[0 /* is_receiving */][is_trailing]; + if (prepend_extra_metadata) { + if (call->send_extra_metadata_count == 0) { + prepend_extra_metadata = 0; + } else { + for (i = 0; i < call->send_extra_metadata_count; i++) { + GRPC_MDELEM_REF(call->send_extra_metadata[i].md); + } + for (i = 1; i < call->send_extra_metadata_count; i++) { + call->send_extra_metadata[i].prev = &call->send_extra_metadata[i - 1]; + } + for (i = 0; i < call->send_extra_metadata_count - 1; i++) { + call->send_extra_metadata[i].next = &call->send_extra_metadata[i + 1]; + } + } + } + for (i = 0; i < count; i++) { + grpc_metadata *md = &metadata[i]; + grpc_linked_mdelem *l = (grpc_linked_mdelem *)&md->internal_data; + GPR_ASSERT(sizeof(grpc_linked_mdelem) == sizeof(md->internal_data)); + l->md = grpc_mdelem_from_string_and_buffer( + md->key, (const uint8_t *)md->value, md->value_length); + if (!grpc_header_key_is_legal(grpc_mdstr_as_c_string(l->md->key), + GRPC_MDSTR_LENGTH(l->md->key))) { + gpr_log(GPR_ERROR, "attempt to send invalid metadata key: %s", + grpc_mdstr_as_c_string(l->md->key)); + return 0; + } else if (!grpc_is_binary_header(grpc_mdstr_as_c_string(l->md->key), + GRPC_MDSTR_LENGTH(l->md->key)) && + !grpc_header_nonbin_value_is_legal( + grpc_mdstr_as_c_string(l->md->value), + GRPC_MDSTR_LENGTH(l->md->value))) { + gpr_log(GPR_ERROR, "attempt to send invalid metadata value"); + return 0; + } + } + for (i = 1; i < count; i++) { + linked_from_md(&metadata[i])->prev = linked_from_md(&metadata[i - 1]); + } + for (i = 0; i < count - 1; i++) { + linked_from_md(&metadata[i])->next = linked_from_md(&metadata[i + 1]); + } + switch (prepend_extra_metadata * 2 + (count != 0)) { + case 0: + /* no prepend, no metadata => nothing to do */ + batch->list.head = batch->list.tail = NULL; + break; + case 1: + /* metadata, but no prepend */ + batch->list.head = linked_from_md(&metadata[0]); + batch->list.tail = linked_from_md(&metadata[count - 1]); + batch->list.head->prev = NULL; + batch->list.tail->next = NULL; + break; + case 2: + /* prepend, but no md */ + batch->list.head = &call->send_extra_metadata[0]; + batch->list.tail = + &call->send_extra_metadata[call->send_extra_metadata_count - 1]; + batch->list.head->prev = NULL; + batch->list.tail->next = NULL; + break; + case 3: + /* prepend AND md */ + batch->list.head = &call->send_extra_metadata[0]; + call->send_extra_metadata[call->send_extra_metadata_count - 1].next = + linked_from_md(&metadata[0]); + linked_from_md(&metadata[0])->prev = + &call->send_extra_metadata[call->send_extra_metadata_count - 1]; + batch->list.tail = linked_from_md(&metadata[count - 1]); + batch->list.head->prev = NULL; + batch->list.tail->next = NULL; + break; + default: + GPR_UNREACHABLE_CODE(return 0); + } + + return 1; +} + +void grpc_call_destroy(grpc_call *c) { + int cancel; + grpc_call *parent = c->parent; + grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; + + GPR_TIMER_BEGIN("grpc_call_destroy", 0); + GRPC_API_TRACE("grpc_call_destroy(c=%p)", 1, (c)); + + if (parent) { + gpr_mu_lock(&parent->mu); + if (c == parent->first_child) { + parent->first_child = c->sibling_next; + if (c == parent->first_child) { + parent->first_child = NULL; + } + c->sibling_prev->sibling_next = c->sibling_next; + c->sibling_next->sibling_prev = c->sibling_prev; + } + gpr_mu_unlock(&parent->mu); + GRPC_CALL_INTERNAL_UNREF(&exec_ctx, parent, "child"); + } + + gpr_mu_lock(&c->mu); + GPR_ASSERT(!c->destroy_called); + c->destroy_called = 1; + if (c->have_alarm) { + grpc_timer_cancel(&exec_ctx, &c->alarm); + } + cancel = !c->received_final_op; + gpr_mu_unlock(&c->mu); + if (cancel) grpc_call_cancel(c, NULL); + GRPC_CALL_INTERNAL_UNREF(&exec_ctx, c, "destroy"); + grpc_exec_ctx_finish(&exec_ctx); + GPR_TIMER_END("grpc_call_destroy", 0); +} + +grpc_call_error grpc_call_cancel(grpc_call *call, void *reserved) { + GRPC_API_TRACE("grpc_call_cancel(call=%p, reserved=%p)", 2, (call, reserved)); + GPR_ASSERT(!reserved); + return grpc_call_cancel_with_status(call, GRPC_STATUS_CANCELLED, "Cancelled", + NULL); +} + +grpc_call_error grpc_call_cancel_with_status(grpc_call *c, + grpc_status_code status, + const char *description, + void *reserved) { + grpc_call_error r; + grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; + GRPC_API_TRACE( + "grpc_call_cancel_with_status(" + "c=%p, status=%d, description=%s, reserved=%p)", + 4, (c, (int)status, description, reserved)); + GPR_ASSERT(reserved == NULL); + gpr_mu_lock(&c->mu); + r = cancel_with_status(&exec_ctx, c, status, description); + gpr_mu_unlock(&c->mu); + grpc_exec_ctx_finish(&exec_ctx); + return r; +} + +typedef struct cancel_closure { + grpc_closure closure; + grpc_call *call; + grpc_status_code status; +} cancel_closure; + +static void done_cancel(grpc_exec_ctx *exec_ctx, void *ccp, bool success) { + cancel_closure *cc = ccp; + GRPC_CALL_INTERNAL_UNREF(exec_ctx, cc->call, "cancel"); + gpr_free(cc); +} + +static void send_cancel(grpc_exec_ctx *exec_ctx, void *ccp, bool success) { + grpc_transport_stream_op op; + cancel_closure *cc = ccp; + memset(&op, 0, sizeof(op)); + op.cancel_with_status = cc->status; + /* reuse closure to catch completion */ + grpc_closure_init(&cc->closure, done_cancel, cc); + op.on_complete = &cc->closure; + execute_op(exec_ctx, cc->call, &op); +} + +static grpc_call_error cancel_with_status(grpc_exec_ctx *exec_ctx, grpc_call *c, + grpc_status_code status, + const char *description) { + grpc_mdstr *details = + description ? grpc_mdstr_from_string(description) : NULL; + cancel_closure *cc = gpr_malloc(sizeof(*cc)); + + GPR_ASSERT(status != GRPC_STATUS_OK); + + set_status_code(c, STATUS_FROM_API_OVERRIDE, (uint32_t)status); + set_status_details(c, STATUS_FROM_API_OVERRIDE, details); + + grpc_closure_init(&cc->closure, send_cancel, cc); + cc->call = c; + cc->status = status; + GRPC_CALL_INTERNAL_REF(c, "cancel"); + grpc_exec_ctx_enqueue(exec_ctx, &cc->closure, true, NULL); + + return GRPC_CALL_OK; +} + +static void execute_op(grpc_exec_ctx *exec_ctx, grpc_call *call, + grpc_transport_stream_op *op) { + grpc_call_element *elem; + + GPR_TIMER_BEGIN("execute_op", 0); + elem = CALL_ELEM_FROM_CALL(call, 0); + op->context = call->context; + elem->filter->start_transport_stream_op(exec_ctx, elem, op); + GPR_TIMER_END("execute_op", 0); +} + +char *grpc_call_get_peer(grpc_call *call) { + grpc_call_element *elem = CALL_ELEM_FROM_CALL(call, 0); + grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; + char *result; + GRPC_API_TRACE("grpc_call_get_peer(%p)", 1, (call)); + result = elem->filter->get_peer(&exec_ctx, elem); + if (result == NULL) { + result = grpc_channel_get_target(call->channel); + } + if (result == NULL) { + result = gpr_strdup("unknown"); + } + grpc_exec_ctx_finish(&exec_ctx); + return result; +} + +grpc_call *grpc_call_from_top_element(grpc_call_element *elem) { + return CALL_FROM_TOP_ELEM(elem); +} + +static void call_alarm(grpc_exec_ctx *exec_ctx, void *arg, bool success) { + grpc_call *call = arg; + gpr_mu_lock(&call->mu); + call->have_alarm = 0; + if (success) { + cancel_with_status(exec_ctx, call, GRPC_STATUS_DEADLINE_EXCEEDED, + "Deadline Exceeded"); + } + gpr_mu_unlock(&call->mu); + GRPC_CALL_INTERNAL_UNREF(exec_ctx, call, "alarm"); +} + +static void set_deadline_alarm(grpc_exec_ctx *exec_ctx, grpc_call *call, + gpr_timespec deadline) { + if (call->have_alarm) { + gpr_log(GPR_ERROR, "Attempt to set deadline alarm twice"); + assert(0); + return; + } + GRPC_CALL_INTERNAL_REF(call, "alarm"); + call->have_alarm = 1; + call->send_deadline = gpr_convert_clock_type(deadline, GPR_CLOCK_MONOTONIC); + grpc_timer_init(exec_ctx, &call->alarm, call->send_deadline, call_alarm, call, + gpr_now(GPR_CLOCK_MONOTONIC)); +} + +/* we offset status by a small amount when storing it into transport metadata + as metadata cannot store a 0 value (which is used as OK for grpc_status_codes + */ +#define STATUS_OFFSET 1 +static void destroy_status(void *ignored) {} + +static uint32_t decode_status(grpc_mdelem *md) { + uint32_t status; + void *user_data; + if (md == GRPC_MDELEM_GRPC_STATUS_0) return 0; + if (md == GRPC_MDELEM_GRPC_STATUS_1) return 1; + if (md == GRPC_MDELEM_GRPC_STATUS_2) return 2; + user_data = grpc_mdelem_get_user_data(md, destroy_status); + if (user_data != NULL) { + status = ((uint32_t)(intptr_t)user_data) - STATUS_OFFSET; + } else { + if (!gpr_parse_bytes_to_uint32(grpc_mdstr_as_c_string(md->value), + GPR_SLICE_LENGTH(md->value->slice), + &status)) { + status = GRPC_STATUS_UNKNOWN; /* could not parse status code */ + } + grpc_mdelem_set_user_data(md, destroy_status, + (void *)(intptr_t)(status + STATUS_OFFSET)); + } + return status; +} + +static uint32_t decode_compression(grpc_mdelem *md) { + grpc_compression_algorithm algorithm = + grpc_compression_algorithm_from_mdstr(md->value); + if (algorithm == GRPC_COMPRESS_ALGORITHMS_COUNT) { + const char *md_c_str = grpc_mdstr_as_c_string(md->value); + gpr_log(GPR_ERROR, "Invalid compression algorithm: '%s'", md_c_str); + } + return algorithm; +} + +static grpc_mdelem *recv_common_filter(grpc_call *call, grpc_mdelem *elem) { + if (elem->key == GRPC_MDSTR_GRPC_STATUS) { + GPR_TIMER_BEGIN("status", 0); + set_status_code(call, STATUS_FROM_WIRE, decode_status(elem)); + GPR_TIMER_END("status", 0); + return NULL; + } else if (elem->key == GRPC_MDSTR_GRPC_MESSAGE) { + GPR_TIMER_BEGIN("status-details", 0); + set_status_details(call, STATUS_FROM_WIRE, GRPC_MDSTR_REF(elem->value)); + GPR_TIMER_END("status-details", 0); + return NULL; + } + return elem; +} + +static grpc_mdelem *publish_app_metadata(grpc_call *call, grpc_mdelem *elem, + int is_trailing) { + grpc_metadata_array *dest; + grpc_metadata *mdusr; + GPR_TIMER_BEGIN("publish_app_metadata", 0); + dest = call->buffered_metadata[is_trailing]; + if (dest->count == dest->capacity) { + dest->capacity = GPR_MAX(dest->capacity + 8, dest->capacity * 2); + dest->metadata = + gpr_realloc(dest->metadata, sizeof(grpc_metadata) * dest->capacity); + } + mdusr = &dest->metadata[dest->count++]; + mdusr->key = grpc_mdstr_as_c_string(elem->key); + mdusr->value = grpc_mdstr_as_c_string(elem->value); + mdusr->value_length = GPR_SLICE_LENGTH(elem->value->slice); + GPR_TIMER_END("publish_app_metadata", 0); + return elem; +} + +static grpc_mdelem *recv_initial_filter(void *callp, grpc_mdelem *elem) { + grpc_call *call = callp; + elem = recv_common_filter(call, elem); + if (elem == NULL) { + return NULL; + } else if (elem->key == GRPC_MDSTR_GRPC_ENCODING) { + GPR_TIMER_BEGIN("compression_algorithm", 0); + set_compression_algorithm(call, decode_compression(elem)); + GPR_TIMER_END("compression_algorithm", 0); + return NULL; + } else if (elem->key == GRPC_MDSTR_GRPC_ACCEPT_ENCODING) { + GPR_TIMER_BEGIN("encodings_accepted_by_peer", 0); + set_encodings_accepted_by_peer(call, elem); + GPR_TIMER_END("encodings_accepted_by_peer", 0); + return NULL; + } else { + return publish_app_metadata(call, elem, 0); + } +} + +static grpc_mdelem *recv_trailing_filter(void *callp, grpc_mdelem *elem) { + grpc_call *call = callp; + elem = recv_common_filter(call, elem); + if (elem == NULL) { + return NULL; + } else { + return publish_app_metadata(call, elem, 1); + } +} + +grpc_call_stack *grpc_call_get_call_stack(grpc_call *call) { + return CALL_STACK_FROM_CALL(call); +} + +/* + * BATCH API IMPLEMENTATION + */ + +static void set_status_value_directly(grpc_status_code status, void *dest) { + *(grpc_status_code *)dest = status; +} + +static void set_cancelled_value(grpc_status_code status, void *dest) { + *(int *)dest = (status != GRPC_STATUS_OK); +} + +static int are_write_flags_valid(uint32_t flags) { + /* check that only bits in GRPC_WRITE_(INTERNAL?)_USED_MASK are set */ + const uint32_t allowed_write_positions = + (GRPC_WRITE_USED_MASK | GRPC_WRITE_INTERNAL_USED_MASK); + const uint32_t invalid_positions = ~allowed_write_positions; + return !(flags & invalid_positions); +} + +static batch_control *allocate_batch_control(grpc_call *call) { + size_t i; + for (i = 0; i < MAX_CONCURRENT_BATCHES; i++) { + if ((call->used_batches & (1 << i)) == 0) { + call->used_batches = (uint8_t)(call->used_batches | (uint8_t)(1 << i)); + return &call->active_batches[i]; + } + } + return NULL; +} + +static void finish_batch_completion(grpc_exec_ctx *exec_ctx, void *user_data, + grpc_cq_completion *storage) { + batch_control *bctl = user_data; + grpc_call *call = bctl->call; + gpr_mu_lock(&call->mu); + call->used_batches = (uint8_t)( + call->used_batches & ~(uint8_t)(1 << (bctl - call->active_batches))); + gpr_mu_unlock(&call->mu); + GRPC_CALL_INTERNAL_UNREF(exec_ctx, call, "completion"); +} + +static void post_batch_completion(grpc_exec_ctx *exec_ctx, + batch_control *bctl) { + grpc_call *call = bctl->call; + if (bctl->is_notify_tag_closure) { + grpc_exec_ctx_enqueue(exec_ctx, bctl->notify_tag, bctl->success, NULL); + gpr_mu_lock(&call->mu); + bctl->call->used_batches = + (uint8_t)(bctl->call->used_batches & + ~(uint8_t)(1 << (bctl - bctl->call->active_batches))); + gpr_mu_unlock(&call->mu); + GRPC_CALL_INTERNAL_UNREF(exec_ctx, call, "completion"); + } else { + grpc_cq_end_op(exec_ctx, bctl->call->cq, bctl->notify_tag, bctl->success, + finish_batch_completion, bctl, &bctl->cq_completion); + } +} + +static void continue_receiving_slices(grpc_exec_ctx *exec_ctx, + batch_control *bctl) { + grpc_call *call = bctl->call; + for (;;) { + size_t remaining = call->receiving_stream->length - + (*call->receiving_buffer)->data.raw.slice_buffer.length; + if (remaining == 0) { + call->receiving_message = 0; + grpc_byte_stream_destroy(exec_ctx, call->receiving_stream); + call->receiving_stream = NULL; + if (gpr_unref(&bctl->steps_to_complete)) { + post_batch_completion(exec_ctx, bctl); + } + return; + } + if (grpc_byte_stream_next(exec_ctx, call->receiving_stream, + &call->receiving_slice, remaining, + &call->receiving_slice_ready)) { + gpr_slice_buffer_add(&(*call->receiving_buffer)->data.raw.slice_buffer, + call->receiving_slice); + } else { + return; + } + } +} + +static void receiving_slice_ready(grpc_exec_ctx *exec_ctx, void *bctlp, + bool success) { + batch_control *bctl = bctlp; + grpc_call *call = bctl->call; + + if (success) { + gpr_slice_buffer_add(&(*call->receiving_buffer)->data.raw.slice_buffer, + call->receiving_slice); + continue_receiving_slices(exec_ctx, bctl); + } else { + grpc_byte_stream_destroy(exec_ctx, call->receiving_stream); + call->receiving_stream = NULL; + grpc_byte_buffer_destroy(*call->receiving_buffer); + *call->receiving_buffer = NULL; + if (gpr_unref(&bctl->steps_to_complete)) { + post_batch_completion(exec_ctx, bctl); + } + } +} + +static void process_data_after_md(grpc_exec_ctx *exec_ctx, batch_control *bctl, + bool success) { + grpc_call *call = bctl->call; + if (call->receiving_stream == NULL) { + *call->receiving_buffer = NULL; + call->receiving_message = 0; + if (gpr_unref(&bctl->steps_to_complete)) { + post_batch_completion(exec_ctx, bctl); + } + } else if (call->receiving_stream->length > + grpc_channel_get_max_message_length(call->channel)) { + cancel_with_status(exec_ctx, call, GRPC_STATUS_INTERNAL, + "Max message size exceeded"); + grpc_byte_stream_destroy(exec_ctx, call->receiving_stream); + call->receiving_stream = NULL; + *call->receiving_buffer = NULL; + call->receiving_message = 0; + if (gpr_unref(&bctl->steps_to_complete)) { + post_batch_completion(exec_ctx, bctl); + } + } else { + call->test_only_last_message_flags = call->receiving_stream->flags; + if ((call->receiving_stream->flags & GRPC_WRITE_INTERNAL_COMPRESS) && + (call->compression_algorithm > GRPC_COMPRESS_NONE)) { + *call->receiving_buffer = grpc_raw_compressed_byte_buffer_create( + NULL, 0, call->compression_algorithm); + } else { + *call->receiving_buffer = grpc_raw_byte_buffer_create(NULL, 0); + } + grpc_closure_init(&call->receiving_slice_ready, receiving_slice_ready, + bctl); + continue_receiving_slices(exec_ctx, bctl); + /* early out */ + return; + } +} + +static void receiving_stream_ready(grpc_exec_ctx *exec_ctx, void *bctlp, + bool success) { + batch_control *bctl = bctlp; + grpc_call *call = bctl->call; + + gpr_mu_lock(&bctl->call->mu); + if (bctl->call->has_initial_md_been_received) { + gpr_mu_unlock(&bctl->call->mu); + process_data_after_md(exec_ctx, bctlp, success); + } else { + call->saved_receiving_stream_ready_ctx.bctlp = bctlp; + call->saved_receiving_stream_ready_ctx.success = success; + gpr_mu_unlock(&bctl->call->mu); + } +} + +static void receiving_initial_metadata_ready(grpc_exec_ctx *exec_ctx, + void *bctlp, bool success) { + batch_control *bctl = bctlp; + grpc_call *call = bctl->call; + + gpr_mu_lock(&call->mu); + + grpc_metadata_batch *md = + &call->metadata_batch[1 /* is_receiving */][0 /* is_trailing */]; + grpc_metadata_batch_filter(md, recv_initial_filter, call); + call->has_initial_md_been_received = true; + + if (gpr_time_cmp(md->deadline, gpr_inf_future(md->deadline.clock_type)) != + 0 && + !call->is_client) { + GPR_TIMER_BEGIN("set_deadline_alarm", 0); + set_deadline_alarm(exec_ctx, call, md->deadline); + GPR_TIMER_END("set_deadline_alarm", 0); + } + + if (call->saved_receiving_stream_ready_ctx.bctlp != NULL) { + grpc_closure *saved_rsr_closure = grpc_closure_create( + receiving_stream_ready, call->saved_receiving_stream_ready_ctx.bctlp); + grpc_exec_ctx_enqueue(exec_ctx, saved_rsr_closure, + call->saved_receiving_stream_ready_ctx.success, NULL); + call->saved_receiving_stream_ready_ctx.bctlp = NULL; + } + + gpr_mu_unlock(&call->mu); + + if (gpr_unref(&bctl->steps_to_complete)) { + post_batch_completion(exec_ctx, bctl); + } +} + +static void finish_batch(grpc_exec_ctx *exec_ctx, void *bctlp, bool success) { + batch_control *bctl = bctlp; + grpc_call *call = bctl->call; + grpc_call *child_call; + grpc_call *next_child_call; + + gpr_mu_lock(&call->mu); + if (bctl->send_initial_metadata) { + grpc_metadata_batch_destroy( + &call->metadata_batch[0 /* is_receiving */][0 /* is_trailing */]); + } + if (bctl->send_message) { + call->sending_message = 0; + } + if (bctl->send_final_op) { + grpc_metadata_batch_destroy( + &call->metadata_batch[0 /* is_receiving */][1 /* is_trailing */]); + } + if (bctl->recv_final_op) { + grpc_metadata_batch *md = + &call->metadata_batch[1 /* is_receiving */][1 /* is_trailing */]; + grpc_metadata_batch_filter(md, recv_trailing_filter, call); + + if (call->have_alarm) { + grpc_timer_cancel(exec_ctx, &call->alarm); + } + /* propagate cancellation to any interested children */ + child_call = call->first_child; + if (child_call != NULL) { + do { + next_child_call = child_call->sibling_next; + if (child_call->cancellation_is_inherited) { + GRPC_CALL_INTERNAL_REF(child_call, "propagate_cancel"); + grpc_call_cancel(child_call, NULL); + GRPC_CALL_INTERNAL_UNREF(exec_ctx, child_call, "propagate_cancel"); + } + child_call = next_child_call; + } while (child_call != call->first_child); + } + + if (call->is_client) { + get_final_status(call, set_status_value_directly, + call->final_op.client.status); + get_final_details(call, call->final_op.client.status_details, + call->final_op.client.status_details_capacity); + } else { + get_final_status(call, set_cancelled_value, + call->final_op.server.cancelled); + } + + success = 1; + } + bctl->success = success != 0; + gpr_mu_unlock(&call->mu); + if (gpr_unref(&bctl->steps_to_complete)) { + post_batch_completion(exec_ctx, bctl); + } +} + +static grpc_call_error call_start_batch(grpc_exec_ctx *exec_ctx, + grpc_call *call, const grpc_op *ops, + size_t nops, void *notify_tag, + int is_notify_tag_closure) { + grpc_transport_stream_op stream_op; + size_t i; + const grpc_op *op; + batch_control *bctl; + int num_completion_callbacks_needed = 1; + grpc_call_error error = GRPC_CALL_OK; + + GPR_TIMER_BEGIN("grpc_call_start_batch", 0); + + GRPC_CALL_LOG_BATCH(GPR_INFO, call, ops, nops, notify_tag); + + memset(&stream_op, 0, sizeof(stream_op)); + + /* TODO(ctiller): this feels like it could be made lock-free */ + gpr_mu_lock(&call->mu); + bctl = allocate_batch_control(call); + memset(bctl, 0, sizeof(*bctl)); + bctl->call = call; + bctl->notify_tag = notify_tag; + bctl->is_notify_tag_closure = (uint8_t)(is_notify_tag_closure != 0); + + if (nops == 0) { + GRPC_CALL_INTERNAL_REF(call, "completion"); + bctl->success = 1; + if (!is_notify_tag_closure) { + grpc_cq_begin_op(call->cq, notify_tag); + } + gpr_mu_unlock(&call->mu); + post_batch_completion(exec_ctx, bctl); + error = GRPC_CALL_OK; + goto done; + } + + /* rewrite batch ops into a transport op */ + for (i = 0; i < nops; i++) { + op = &ops[i]; + if (op->reserved != NULL) { + error = GRPC_CALL_ERROR; + goto done_with_error; + } + switch (op->op) { + case GRPC_OP_SEND_INITIAL_METADATA: + /* Flag validation: currently allow no flags */ + if (op->flags != 0) { + error = GRPC_CALL_ERROR_INVALID_FLAGS; + goto done_with_error; + } + if (call->sent_initial_metadata) { + error = GRPC_CALL_ERROR_TOO_MANY_OPERATIONS; + goto done_with_error; + } + if (op->data.send_initial_metadata.count > INT_MAX) { + error = GRPC_CALL_ERROR_INVALID_METADATA; + goto done_with_error; + } + bctl->send_initial_metadata = 1; + call->sent_initial_metadata = 1; + if (!prepare_application_metadata( + call, (int)op->data.send_initial_metadata.count, + op->data.send_initial_metadata.metadata, 0, call->is_client)) { + error = GRPC_CALL_ERROR_INVALID_METADATA; + goto done_with_error; + } + /* TODO(ctiller): just make these the same variable? */ + call->metadata_batch[0][0].deadline = call->send_deadline; + stream_op.send_initial_metadata = + &call->metadata_batch[0 /* is_receiving */][0 /* is_trailing */]; + break; + case GRPC_OP_SEND_MESSAGE: + if (!are_write_flags_valid(op->flags)) { + error = GRPC_CALL_ERROR_INVALID_FLAGS; + goto done_with_error; + } + if (op->data.send_message == NULL) { + error = GRPC_CALL_ERROR_INVALID_MESSAGE; + goto done_with_error; + } + if (call->sending_message) { + error = GRPC_CALL_ERROR_TOO_MANY_OPERATIONS; + goto done_with_error; + } + bctl->send_message = 1; + call->sending_message = 1; + grpc_slice_buffer_stream_init( + &call->sending_stream, + &op->data.send_message->data.raw.slice_buffer, op->flags); + stream_op.send_message = &call->sending_stream.base; + break; + case GRPC_OP_SEND_CLOSE_FROM_CLIENT: + /* Flag validation: currently allow no flags */ + if (op->flags != 0) { + error = GRPC_CALL_ERROR_INVALID_FLAGS; + goto done_with_error; + } + if (!call->is_client) { + error = GRPC_CALL_ERROR_NOT_ON_SERVER; + goto done_with_error; + } + if (call->sent_final_op) { + error = GRPC_CALL_ERROR_TOO_MANY_OPERATIONS; + goto done_with_error; + } + bctl->send_final_op = 1; + call->sent_final_op = 1; + stream_op.send_trailing_metadata = + &call->metadata_batch[0 /* is_receiving */][1 /* is_trailing */]; + break; + case GRPC_OP_SEND_STATUS_FROM_SERVER: + /* Flag validation: currently allow no flags */ + if (op->flags != 0) { + error = GRPC_CALL_ERROR_INVALID_FLAGS; + goto done_with_error; + } + if (call->is_client) { + error = GRPC_CALL_ERROR_NOT_ON_CLIENT; + goto done_with_error; + } + if (call->sent_final_op) { + error = GRPC_CALL_ERROR_TOO_MANY_OPERATIONS; + goto done_with_error; + } + if (op->data.send_status_from_server.trailing_metadata_count > + INT_MAX) { + error = GRPC_CALL_ERROR_INVALID_METADATA; + goto done_with_error; + } + bctl->send_final_op = 1; + call->sent_final_op = 1; + call->send_extra_metadata_count = 1; + call->send_extra_metadata[0].md = grpc_channel_get_reffed_status_elem( + call->channel, op->data.send_status_from_server.status); + if (op->data.send_status_from_server.status_details != NULL) { + call->send_extra_metadata[1].md = grpc_mdelem_from_metadata_strings( + GRPC_MDSTR_GRPC_MESSAGE, + grpc_mdstr_from_string( + op->data.send_status_from_server.status_details)); + call->send_extra_metadata_count++; + set_status_details( + call, STATUS_FROM_API_OVERRIDE, + GRPC_MDSTR_REF(call->send_extra_metadata[1].md->value)); + } + set_status_code(call, STATUS_FROM_API_OVERRIDE, + (uint32_t)op->data.send_status_from_server.status); + if (!prepare_application_metadata( + call, + (int)op->data.send_status_from_server.trailing_metadata_count, + op->data.send_status_from_server.trailing_metadata, 1, 1)) { + error = GRPC_CALL_ERROR_INVALID_METADATA; + goto done_with_error; + } + stream_op.send_trailing_metadata = + &call->metadata_batch[0 /* is_receiving */][1 /* is_trailing */]; + break; + case GRPC_OP_RECV_INITIAL_METADATA: + /* Flag validation: currently allow no flags */ + if (op->flags != 0) { + error = GRPC_CALL_ERROR_INVALID_FLAGS; + goto done_with_error; + } + if (call->received_initial_metadata) { + error = GRPC_CALL_ERROR_TOO_MANY_OPERATIONS; + goto done_with_error; + } + call->received_initial_metadata = 1; + call->buffered_metadata[0] = op->data.recv_initial_metadata; + grpc_closure_init(&call->receiving_initial_metadata_ready, + receiving_initial_metadata_ready, bctl); + bctl->recv_initial_metadata = 1; + stream_op.recv_initial_metadata = + &call->metadata_batch[1 /* is_receiving */][0 /* is_trailing */]; + stream_op.recv_initial_metadata_ready = + &call->receiving_initial_metadata_ready; + num_completion_callbacks_needed++; + break; + case GRPC_OP_RECV_MESSAGE: + /* Flag validation: currently allow no flags */ + if (op->flags != 0) { + error = GRPC_CALL_ERROR_INVALID_FLAGS; + goto done_with_error; + } + if (call->receiving_message) { + error = GRPC_CALL_ERROR_TOO_MANY_OPERATIONS; + goto done_with_error; + } + call->receiving_message = 1; + bctl->recv_message = 1; + call->receiving_buffer = op->data.recv_message; + stream_op.recv_message = &call->receiving_stream; + grpc_closure_init(&call->receiving_stream_ready, receiving_stream_ready, + bctl); + stream_op.recv_message_ready = &call->receiving_stream_ready; + num_completion_callbacks_needed++; + break; + case GRPC_OP_RECV_STATUS_ON_CLIENT: + /* Flag validation: currently allow no flags */ + if (op->flags != 0) { + error = GRPC_CALL_ERROR_INVALID_FLAGS; + goto done_with_error; + } + if (!call->is_client) { + error = GRPC_CALL_ERROR_NOT_ON_SERVER; + goto done_with_error; + } + if (call->received_final_op) { + error = GRPC_CALL_ERROR_TOO_MANY_OPERATIONS; + goto done_with_error; + } + call->received_final_op = 1; + call->buffered_metadata[1] = + op->data.recv_status_on_client.trailing_metadata; + call->final_op.client.status = op->data.recv_status_on_client.status; + call->final_op.client.status_details = + op->data.recv_status_on_client.status_details; + call->final_op.client.status_details_capacity = + op->data.recv_status_on_client.status_details_capacity; + bctl->recv_final_op = 1; + stream_op.recv_trailing_metadata = + &call->metadata_batch[1 /* is_receiving */][1 /* is_trailing */]; + break; + case GRPC_OP_RECV_CLOSE_ON_SERVER: + /* Flag validation: currently allow no flags */ + if (op->flags != 0) { + error = GRPC_CALL_ERROR_INVALID_FLAGS; + goto done_with_error; + } + if (call->is_client) { + error = GRPC_CALL_ERROR_NOT_ON_CLIENT; + goto done_with_error; + } + if (call->received_final_op) { + error = GRPC_CALL_ERROR_TOO_MANY_OPERATIONS; + goto done_with_error; + } + call->received_final_op = 1; + call->final_op.server.cancelled = + op->data.recv_close_on_server.cancelled; + bctl->recv_final_op = 1; + stream_op.recv_trailing_metadata = + &call->metadata_batch[1 /* is_receiving */][1 /* is_trailing */]; + break; + } + } + + GRPC_CALL_INTERNAL_REF(call, "completion"); + if (!is_notify_tag_closure) { + grpc_cq_begin_op(call->cq, notify_tag); + } + gpr_ref_init(&bctl->steps_to_complete, num_completion_callbacks_needed); + + stream_op.context = call->context; + grpc_closure_init(&bctl->finish_batch, finish_batch, bctl); + stream_op.on_complete = &bctl->finish_batch; + gpr_mu_unlock(&call->mu); + + execute_op(exec_ctx, call, &stream_op); + +done: + GPR_TIMER_END("grpc_call_start_batch", 0); + return error; + +done_with_error: + /* reverse any mutations that occured */ + if (bctl->send_initial_metadata) { + call->sent_initial_metadata = 0; + grpc_metadata_batch_clear(&call->metadata_batch[0][0]); + } + if (bctl->send_message) { + call->sending_message = 0; + grpc_byte_stream_destroy(exec_ctx, &call->sending_stream.base); + } + if (bctl->send_final_op) { + call->sent_final_op = 0; + grpc_metadata_batch_clear(&call->metadata_batch[0][1]); + } + if (bctl->recv_initial_metadata) { + call->received_initial_metadata = 0; + } + if (bctl->recv_message) { + call->receiving_message = 0; + } + if (bctl->recv_final_op) { + call->received_final_op = 0; + } + gpr_mu_unlock(&call->mu); + goto done; +} + +grpc_call_error grpc_call_start_batch(grpc_call *call, const grpc_op *ops, + size_t nops, void *tag, void *reserved) { + grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; + grpc_call_error err; + + GRPC_API_TRACE( + "grpc_call_start_batch(call=%p, ops=%p, nops=%lu, tag=%p, reserved=%p)", + 5, (call, ops, (unsigned long)nops, tag, reserved)); + + if (reserved != NULL) { + err = GRPC_CALL_ERROR; + } else { + err = call_start_batch(&exec_ctx, call, ops, nops, tag, 0); + } + + grpc_exec_ctx_finish(&exec_ctx); + return err; +} + +grpc_call_error grpc_call_start_batch_and_execute(grpc_exec_ctx *exec_ctx, + grpc_call *call, + const grpc_op *ops, + size_t nops, + grpc_closure *closure) { + return call_start_batch(exec_ctx, call, ops, nops, closure, 1); +} + +void grpc_call_context_set(grpc_call *call, grpc_context_index elem, + void *value, void (*destroy)(void *value)) { + if (call->context[elem].destroy) { + call->context[elem].destroy(call->context[elem].value); + } + call->context[elem].value = value; + call->context[elem].destroy = destroy; +} + +void *grpc_call_context_get(grpc_call *call, grpc_context_index elem) { + return call->context[elem].value; +} + +uint8_t grpc_call_is_client(grpc_call *call) { return call->is_client; } + +grpc_compression_algorithm grpc_call_compression_for_level( + grpc_call *call, grpc_compression_level level) { + gpr_mu_lock(&call->mu); + const uint32_t accepted_encodings = call->encodings_accepted_by_peer; + gpr_mu_unlock(&call->mu); + return grpc_compression_algorithm_for_level(level, accepted_encodings); +} |