diff options
Diffstat (limited to 'src/core/ext/load_reporting/load_reporting_filter.c')
| -rw-r--r-- | src/core/ext/load_reporting/load_reporting_filter.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/src/core/ext/load_reporting/load_reporting_filter.c b/src/core/ext/load_reporting/load_reporting_filter.c new file mode 100644 index 0000000000..f372f88c3a --- /dev/null +++ b/src/core/ext/load_reporting/load_reporting_filter.c @@ -0,0 +1,151 @@ +/* + * + * Copyright 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 <grpc/support/log.h> +#include <grpc/support/string_util.h> +#include <grpc/support/sync.h> +#include <string.h> + +#include "src/core/ext/load_reporting/load_reporting.h" +#include "src/core/ext/load_reporting/load_reporting_filter.h" +#include "src/core/lib/channel/channel_args.h" +#include "src/core/lib/profiling/timers.h" +#include "src/core/lib/transport/static_metadata.h" + +typedef struct call_data { const char *trailing_md_string; } call_data; +typedef struct channel_data { + gpr_mu mu; + grpc_load_reporting_config *lrc; +} channel_data; + +static void invoke_lr_fn_locked(grpc_load_reporting_config *lrc, + grpc_load_reporting_call_data *lr_call_data) { + GPR_TIMER_BEGIN("load_reporting_config_fn", 0); + grpc_load_reporting_config_call(lrc, lr_call_data); + GPR_TIMER_END("load_reporting_config_fn", 0); +} + +/* Constructor for call_data */ +static void init_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, + grpc_call_element_args *args) { + call_data *calld = elem->call_data; + memset(calld, 0, sizeof(call_data)); +} + +/* Destructor for call_data */ +static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, + const grpc_call_stats *stats, void *ignored) { + channel_data *chand = elem->channel_data; + call_data *calld = elem->call_data; + + grpc_load_reporting_call_data lr_call_data = {stats, + calld->trailing_md_string}; + + gpr_mu_lock(&chand->mu); + invoke_lr_fn_locked(chand->lrc, &lr_call_data); + gpr_mu_unlock(&chand->mu); +} + +/* Constructor for channel_data */ +static void init_channel_elem(grpc_exec_ctx *exec_ctx, + grpc_channel_element *elem, + grpc_channel_element_args *args) { + GPR_ASSERT(!args->is_last); + + channel_data *chand = elem->channel_data; + memset(chand, 0, sizeof(channel_data)); + + gpr_mu_init(&chand->mu); + for (size_t i = 0; i < args->channel_args->num_args; i++) { + if (0 == strcmp(args->channel_args->args[i].key, + GRPC_ARG_ENABLE_LOAD_REPORTING)) { + grpc_load_reporting_config *arg_lrc = + args->channel_args->args[i].value.pointer.p; + chand->lrc = grpc_load_reporting_config_copy(arg_lrc); + GPR_ASSERT(chand->lrc != NULL); + break; + } + } + GPR_ASSERT(chand->lrc != NULL); /* arg actually found */ + + gpr_mu_lock(&chand->mu); + invoke_lr_fn_locked(chand->lrc, NULL); + gpr_mu_unlock(&chand->mu); +} + +/* Destructor for channel data */ +static void destroy_channel_elem(grpc_exec_ctx *exec_ctx, + grpc_channel_element *elem) { + channel_data *chand = elem->channel_data; + gpr_mu_destroy(&chand->mu); + grpc_load_reporting_config_destroy(chand->lrc); +} + +static grpc_mdelem *lr_trailing_md_filter(void *user_data, grpc_mdelem *md) { + grpc_call_element *elem = user_data; + call_data *calld = elem->call_data; + + if (md->key == GRPC_MDSTR_LOAD_REPORTING) { + calld->trailing_md_string = gpr_strdup(grpc_mdstr_as_c_string(md->value)); + return NULL; + } + + return md; +} + +static void lr_start_transport_stream_op(grpc_exec_ctx *exec_ctx, + grpc_call_element *elem, + grpc_transport_stream_op *op) { + GPR_TIMER_BEGIN("lr_start_transport_stream_op", 0); + + if (op->send_trailing_metadata) { + grpc_metadata_batch_filter(op->send_trailing_metadata, + lr_trailing_md_filter, elem); + } + grpc_call_next_op(exec_ctx, elem, op); + + GPR_TIMER_END("lr_start_transport_stream_op", 0); +} + +const grpc_channel_filter grpc_load_reporting_filter = { + lr_start_transport_stream_op, + grpc_channel_next_op, + sizeof(call_data), + init_call_elem, + grpc_call_stack_ignore_set_pollset_or_pollset_set, + destroy_call_elem, + sizeof(channel_data), + init_channel_elem, + destroy_channel_elem, + grpc_call_next_get_peer, + "load_reporting"}; |