diff options
Diffstat (limited to 'src/core/channel/channel_stack.c')
| -rw-r--r-- | src/core/channel/channel_stack.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/core/channel/channel_stack.c b/src/core/channel/channel_stack.c new file mode 100644 index 0000000000..a403db35c2 --- /dev/null +++ b/src/core/channel/channel_stack.c @@ -0,0 +1,223 @@ +/* + * + * Copyright 2014, 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/channel/channel_stack.h" +#include <grpc/support/log.h> + +#include <stdlib.h> + +/* Memory layouts. + + Channel stack is laid out as: { + grpc_channel_stack stk; + padding to GPR_MAX_ALIGNMENT + grpc_channel_element[stk.count]; + per-filter memory, aligned to GPR_MAX_ALIGNMENT + } + + Call stack is laid out as: { + grpc_call_stack stk; + padding to GPR_MAX_ALIGNMENT + grpc_call_element[stk.count]; + per-filter memory, aligned to GPR_MAX_ALIGNMENT + } */ + +/* Given a size, round up to the next multiple of sizeof(void*) */ +#define ROUND_UP_TO_ALIGNMENT_SIZE(x) \ + (((x)+GPR_MAX_ALIGNMENT - 1) & ~(GPR_MAX_ALIGNMENT - 1)) + +size_t grpc_channel_stack_size(const grpc_channel_filter **filters, + size_t filter_count) { + /* always need the header, and size for the channel elements */ + size_t size = + ROUND_UP_TO_ALIGNMENT_SIZE(sizeof(grpc_channel_stack)) + + ROUND_UP_TO_ALIGNMENT_SIZE(filter_count * sizeof(grpc_channel_element)); + size_t i; + + GPR_ASSERT((GPR_MAX_ALIGNMENT & (GPR_MAX_ALIGNMENT - 1)) == 0 && + "GPR_MAX_ALIGNMENT must be a power of two"); + + /* add the size for each filter */ + for (i = 0; i < filter_count; i++) { + size += ROUND_UP_TO_ALIGNMENT_SIZE(filters[i]->sizeof_channel_data); + } + + return size; +} + +#define CHANNEL_ELEMS_FROM_STACK(stk) \ + ((grpc_channel_element *)((char *)(stk) + ROUND_UP_TO_ALIGNMENT_SIZE( \ + sizeof(grpc_channel_stack)))) + +#define CALL_ELEMS_FROM_STACK(stk) \ + ((grpc_call_element *)((char *)(stk) + \ + ROUND_UP_TO_ALIGNMENT_SIZE(sizeof(grpc_call_stack)))) + +grpc_channel_element *grpc_channel_stack_element( + grpc_channel_stack *channel_stack, size_t index) { + return CHANNEL_ELEMS_FROM_STACK(channel_stack) + index; +} + +grpc_channel_element *grpc_channel_stack_last_element( + grpc_channel_stack *channel_stack) { + return grpc_channel_stack_element(channel_stack, channel_stack->count - 1); +} + +grpc_call_element *grpc_call_stack_element(grpc_call_stack *call_stack, + size_t index) { + return CALL_ELEMS_FROM_STACK(call_stack) + index; +} + +void grpc_channel_stack_init(const grpc_channel_filter **filters, + size_t filter_count, const grpc_channel_args *args, + grpc_mdctx *metadata_context, + grpc_channel_stack *stack) { + size_t call_size = + ROUND_UP_TO_ALIGNMENT_SIZE(sizeof(grpc_call_stack)) + + ROUND_UP_TO_ALIGNMENT_SIZE(filter_count * sizeof(grpc_call_element)); + grpc_channel_element *elems; + char *user_data; + size_t i; + + stack->count = filter_count; + elems = CHANNEL_ELEMS_FROM_STACK(stack); + user_data = + ((char *)elems) + + ROUND_UP_TO_ALIGNMENT_SIZE(filter_count * sizeof(grpc_channel_element)); + + /* init per-filter data */ + for (i = 0; i < filter_count; i++) { + elems[i].filter = filters[i]; + elems[i].channel_data = user_data; + elems[i].filter->init_channel_elem(&elems[i], args, metadata_context, + i == 0, i == (filter_count - 1)); + user_data += ROUND_UP_TO_ALIGNMENT_SIZE(filters[i]->sizeof_channel_data); + call_size += ROUND_UP_TO_ALIGNMENT_SIZE(filters[i]->sizeof_call_data); + } + + GPR_ASSERT(user_data - (char *)stack == + grpc_channel_stack_size(filters, filter_count)); + + stack->call_stack_size = call_size; +} + +void grpc_channel_stack_destroy(grpc_channel_stack *stack) { + grpc_channel_element *channel_elems = CHANNEL_ELEMS_FROM_STACK(stack); + size_t count = stack->count; + size_t i; + + /* destroy per-filter data */ + for (i = 0; i < count; i++) { + channel_elems[i].filter->destroy_channel_elem(&channel_elems[i]); + } +} + +void grpc_call_stack_init(grpc_channel_stack *channel_stack, + const void *transport_server_data, + grpc_call_stack *call_stack) { + grpc_channel_element *channel_elems = CHANNEL_ELEMS_FROM_STACK(channel_stack); + size_t count = channel_stack->count; + grpc_call_element *call_elems; + char *user_data; + size_t i; + + call_stack->count = count; + call_elems = CALL_ELEMS_FROM_STACK(call_stack); + user_data = ((char *)call_elems) + + ROUND_UP_TO_ALIGNMENT_SIZE(count * sizeof(grpc_call_element)); + + /* init per-filter data */ + for (i = 0; i < count; i++) { + call_elems[i].filter = channel_elems[i].filter; + call_elems[i].channel_data = channel_elems[i].channel_data; + call_elems[i].call_data = user_data; + call_elems[i].filter->init_call_elem(&call_elems[i], transport_server_data); + user_data += + ROUND_UP_TO_ALIGNMENT_SIZE(call_elems[i].filter->sizeof_call_data); + } +} + +void grpc_call_stack_destroy(grpc_call_stack *stack) { + grpc_call_element *elems = CALL_ELEMS_FROM_STACK(stack); + size_t count = stack->count; + size_t i; + + /* destroy per-filter data */ + for (i = 0; i < count; i++) { + elems[i].filter->destroy_call_elem(&elems[i]); + } +} + +void grpc_call_next_op(grpc_call_element *elem, grpc_call_op *op) { + grpc_call_element *next_elem = elem + op->dir; + next_elem->filter->call_op(next_elem, op); +} + +void grpc_channel_next_op(grpc_channel_element *elem, grpc_channel_op *op) { + grpc_channel_element *next_elem = elem + op->dir; + next_elem->filter->channel_op(next_elem, op); +} + +grpc_channel_stack *grpc_channel_stack_from_top_element( + grpc_channel_element *elem) { + return (grpc_channel_stack *)((char *)(elem) - + ROUND_UP_TO_ALIGNMENT_SIZE( + sizeof(grpc_channel_stack))); +} + +grpc_call_stack *grpc_call_stack_from_top_element(grpc_call_element *elem) { + return (grpc_call_stack *)((char *)(elem) - ROUND_UP_TO_ALIGNMENT_SIZE( + sizeof(grpc_call_stack))); +} + +static void do_nothing(void *user_data, grpc_op_error error) {} + +void grpc_call_element_send_metadata(grpc_call_element *cur_elem, + grpc_mdelem *mdelem) { + grpc_call_op metadata_op; + metadata_op.type = GRPC_SEND_METADATA; + metadata_op.dir = GRPC_CALL_DOWN; + metadata_op.done_cb = do_nothing; + metadata_op.user_data = NULL; + metadata_op.data.metadata = grpc_mdelem_ref(mdelem); + grpc_call_next_op(cur_elem, &metadata_op); +} + +void grpc_call_element_send_cancel(grpc_call_element *cur_elem) { + grpc_call_op cancel_op; + cancel_op.type = GRPC_CANCEL_OP; + cancel_op.dir = GRPC_CALL_DOWN; + cancel_op.done_cb = do_nothing; + cancel_op.user_data = NULL; + grpc_call_next_op(cur_elem, &cancel_op); +} |