diff options
Diffstat (limited to 'src/core/ext/load_reporting/load_reporting.c')
-rw-r--r-- | src/core/ext/load_reporting/load_reporting.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/core/ext/load_reporting/load_reporting.c b/src/core/ext/load_reporting/load_reporting.c new file mode 100644 index 0000000000..9e4d32676f --- /dev/null +++ b/src/core/ext/load_reporting/load_reporting.c @@ -0,0 +1,133 @@ +/* + * + * 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 <limits.h> +#include <string.h> + +#include <grpc/support/alloc.h> +#include <grpc/support/sync.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_stack_builder.h" +#include "src/core/lib/surface/channel_init.h" + +struct grpc_load_reporting_config { + grpc_load_reporting_fn fn; + void *user_data; +}; + +grpc_load_reporting_config *grpc_load_reporting_config_create( + grpc_load_reporting_fn fn, void *user_data) { + GPR_ASSERT(fn != NULL); + grpc_load_reporting_config *lrc = + gpr_malloc(sizeof(grpc_load_reporting_config)); + lrc->fn = fn; + lrc->user_data = user_data; + return lrc; +} + +grpc_load_reporting_config *grpc_load_reporting_config_copy( + grpc_load_reporting_config *src) { + return grpc_load_reporting_config_create(src->fn, src->user_data); +} + +void grpc_load_reporting_config_destroy(grpc_load_reporting_config *lrc) { + gpr_free(lrc); +} + +void grpc_load_reporting_config_call( + grpc_load_reporting_config *lrc, + const grpc_load_reporting_call_data *call_data) { + lrc->fn(call_data, lrc->user_data); +} + +static bool is_load_reporting_enabled(const grpc_channel_args *a) { + if (a == NULL) return false; + for (size_t i = 0; i < a->num_args; i++) { + if (0 == strcmp(a->args[i].key, GRPC_ARG_ENABLE_LOAD_REPORTING)) { + return a->args[i].type == GRPC_ARG_POINTER && + a->args[i].value.pointer.p != NULL; + } + } + return false; +} + +static bool maybe_add_load_reporting_filter(grpc_channel_stack_builder *builder, + void *arg) { + const grpc_channel_args *args = + grpc_channel_stack_builder_get_channel_arguments(builder); + if (is_load_reporting_enabled(args)) { + return grpc_channel_stack_builder_prepend_filter( + builder, (const grpc_channel_filter *)arg, NULL, NULL); + } + return true; +} + +static void lrd_arg_destroy(void *p) { grpc_load_reporting_config_destroy(p); } + +static void *lrd_arg_copy(void *p) { + return grpc_load_reporting_config_copy(p); +} + +static int lrd_arg_cmp(void *a, void *b) { + grpc_load_reporting_config *lhs = a; + grpc_load_reporting_config *rhs = b; + return !(lhs->fn == rhs->fn && lhs->user_data == rhs->user_data); +} + +static const grpc_arg_pointer_vtable lrd_ptr_vtable = { + lrd_arg_copy, lrd_arg_destroy, lrd_arg_cmp}; + +grpc_arg grpc_load_reporting_config_create_arg( + grpc_load_reporting_config *lrc) { + grpc_arg arg; + arg.type = GRPC_ARG_POINTER; + arg.key = GRPC_ARG_ENABLE_LOAD_REPORTING; + arg.value.pointer.p = lrc; + arg.value.pointer.vtable = &lrd_ptr_vtable; + return arg; +} + +/* Plugin registration */ + +void grpc_load_reporting_plugin_init(void) { + grpc_channel_init_register_stage(GRPC_CLIENT_CHANNEL, INT_MAX, + maybe_add_load_reporting_filter, + (void *)&grpc_load_reporting_filter); + grpc_channel_init_register_stage(GRPC_SERVER_CHANNEL, INT_MAX, + maybe_add_load_reporting_filter, + (void *)&grpc_load_reporting_filter); +} + +void grpc_load_reporting_plugin_shutdown() {} |