| /* |
| * |
| * Copyright 2015, 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. |
| * |
| */ |
| |
| #ifndef GRPC_CORE_EXT_CENSUS_CENSUS_INTERFACE_H |
| #define GRPC_CORE_EXT_CENSUS_CENSUS_INTERFACE_H |
| |
| #include <grpc/support/port_platform.h> |
| |
| /* Maximum length of an individual census trace annotation. */ |
| #define CENSUS_MAX_ANNOTATION_LENGTH 200 |
| |
| /* Structure of a census op id. Define as structure because 64bit integer is not |
| available on every platform for C89. */ |
| typedef struct census_op_id { |
| uint32_t upper; |
| uint32_t lower; |
| } census_op_id; |
| |
| typedef struct census_rpc_stats census_rpc_stats; |
| |
| /* Initializes Census library. No-op if Census is already initialized. */ |
| void census_init(void); |
| |
| /* Shutdown Census Library. */ |
| void census_shutdown(void); |
| |
| /* Annotates grpc method name on a census_op_id. The method name has the format |
| of <full quantified rpc service name>/<rpc function name>. Returns 0 iff |
| op_id and method_name are all valid. op_id is valid after its creation and |
| before calling census_tracing_end_op(). |
| |
| TODO(hongyu): Figure out valid characters set for service name and command |
| name and document requirements here.*/ |
| int census_add_method_tag(census_op_id op_id, const char *method_name); |
| |
| /* Annotates tracing information to a specific op_id. |
| Up to CENSUS_MAX_ANNOTATION_LENGTH bytes are recorded. */ |
| void census_tracing_print(census_op_id op_id, const char *annotation); |
| |
| /* Starts tracing for an RPC. Returns a locally unique census_op_id */ |
| census_op_id census_tracing_start_op(void); |
| |
| /* Ends tracing. Calling this function will invalidate the input op_id. */ |
| void census_tracing_end_op(census_op_id op_id); |
| |
| #endif /* GRPC_CORE_EXT_CENSUS_CENSUS_INTERFACE_H */ |