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/*
* 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 <stdio.h>
#include <string.h>
#include <grpc/census.h>
#include <grpc/support/log.h>
#include "base_resources.h"
#include "gen/census.pb.h"
#include "third_party/nanopb/pb_encode.h"
// Add base RPC resource definitions for use by RPC runtime.
//
// TODO(aveitch): All of these are currently hardwired definitions encoded in
// the code in this file. These should be converted to use an external
// configuration mechanism, in which these resources are defined in a text
// file, which is compiled to .pb format and read by still-to-be-written
// configuration functions.
// Structure representing a MeasurementUnit proto.
typedef struct {
int32_t prefix;
int n_numerators;
const google_census_Resource_BasicUnit *numerators;
int n_denominators;
const google_census_Resource_BasicUnit *denominators;
} measurement_unit;
// Encode a nanopb string. Expects the string argument to be passed in as `arg`.
static bool encode_string(pb_ostream_t *stream, const pb_field_t *field,
void *const *arg) {
if (!pb_encode_tag_for_field(stream, field)) {
return false;
}
return pb_encode_string(stream, (uint8_t *)*arg, strlen((const char *)*arg));
}
// Encode the numerators part of a measurement_unit (passed in as `arg`).
static bool encode_numerators(pb_ostream_t *stream, const pb_field_t *field,
void *const *arg) {
const measurement_unit *mu = (const measurement_unit *)*arg;
for (int i = 0; i < mu->n_numerators; i++) {
if (!pb_encode_tag_for_field(stream, field)) {
return false;
}
if (!pb_encode_varint(stream, mu->numerators[i])) {
return false;
}
}
return true;
}
// Encode the denominators part of a measurement_unit (passed in as `arg`).
static bool encode_denominators(pb_ostream_t *stream, const pb_field_t *field,
void *const *arg) {
const measurement_unit *mu = (const measurement_unit *)*arg;
for (int i = 0; i < mu->n_denominators; i++) {
if (!pb_encode_tag_for_field(stream, field)) {
return false;
}
if (!pb_encode_varint(stream, mu->numerators[i])) {
return false;
}
}
return true;
}
// Define a Resource, given the important details. Encodes a protobuf, which
// is then passed to census_define_resource.
static void define_resource(const char *name, const char *description,
const measurement_unit *unit) {
// nanopb generated type for Resource. Initialize encoding functions to NULL
// since we can't directly initialize them due to embedded union in struct.
google_census_Resource resource = {
{{NULL}, (void *)name},
{{NULL}, (void *)description},
true, // has_unit
{true, unit->prefix, {{NULL}, (void *)unit}, {{NULL}, (void *)unit}}};
resource.name.funcs.encode = &encode_string;
resource.description.funcs.encode = &encode_string;
resource.unit.numerator.funcs.encode = &encode_numerators;
resource.unit.denominator.funcs.encode = &encode_denominators;
// Buffer for storing encoded proto.
uint8_t buffer[512];
pb_ostream_t stream = pb_ostream_from_buffer(buffer, 512);
if (!pb_encode(&stream, google_census_Resource_fields, &resource)) {
gpr_log(GPR_ERROR, "Error encoding resource %s.", name);
return;
}
int32_t mid = census_define_resource(buffer, stream.bytes_written);
if (mid < 0) {
gpr_log(GPR_ERROR, "Error defining resource %s.", name);
}
}
// Define a resource for client RPC latency.
static void define_client_rpc_latency_resource() {
google_census_Resource_BasicUnit numerator =
google_census_Resource_BasicUnit_SECS;
measurement_unit unit = {0, 1, &numerator, 0, NULL};
define_resource("client_rpc_latency", "Client RPC latency in seconds", &unit);
}
// Define a resource for server RPC latency.
static void define_server_rpc_latency_resource() {
google_census_Resource_BasicUnit numerator =
google_census_Resource_BasicUnit_SECS;
measurement_unit unit = {0, 1, &numerator, 0, NULL};
define_resource("server_rpc_latency", "Server RPC latency in seconds", &unit);
}
// Define all base resources. This should be called by census initialization.
void define_base_resources() {
define_client_rpc_latency_resource();
define_server_rpc_latency_resource();
}
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