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/*
*
* Copyright 2017 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <grpc/support/port_platform.h>
#include "src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_client_stats.h"
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/atm.h>
#include <grpc/support/string_util.h>
#include <grpc/support/sync.h>
#include "src/core/lib/channel/channel_args.h"
#define GRPC_ARG_GRPCLB_CLIENT_STATS "grpc.grpclb_client_stats"
struct grpc_grpclb_client_stats {
gpr_refcount refs;
// This field must only be accessed via *_locked() methods.
grpc_grpclb_dropped_call_counts* drop_token_counts;
// These fields may be accessed from multiple threads at a time.
gpr_atm num_calls_started;
gpr_atm num_calls_finished;
gpr_atm num_calls_finished_with_client_failed_to_send;
gpr_atm num_calls_finished_known_received;
};
grpc_grpclb_client_stats* grpc_grpclb_client_stats_create() {
grpc_grpclb_client_stats* client_stats =
static_cast<grpc_grpclb_client_stats*>(gpr_zalloc(sizeof(*client_stats)));
gpr_ref_init(&client_stats->refs, 1);
return client_stats;
}
grpc_grpclb_client_stats* grpc_grpclb_client_stats_ref(
grpc_grpclb_client_stats* client_stats) {
gpr_ref(&client_stats->refs);
return client_stats;
}
void grpc_grpclb_client_stats_unref(grpc_grpclb_client_stats* client_stats) {
if (gpr_unref(&client_stats->refs)) {
grpc_grpclb_dropped_call_counts_destroy(client_stats->drop_token_counts);
gpr_free(client_stats);
}
}
void grpc_grpclb_client_stats_add_call_started(
grpc_grpclb_client_stats* client_stats) {
gpr_atm_full_fetch_add(&client_stats->num_calls_started, (gpr_atm)1);
}
void grpc_grpclb_client_stats_add_call_finished(
bool finished_with_client_failed_to_send, bool finished_known_received,
grpc_grpclb_client_stats* client_stats) {
gpr_atm_full_fetch_add(&client_stats->num_calls_finished, (gpr_atm)1);
if (finished_with_client_failed_to_send) {
gpr_atm_full_fetch_add(
&client_stats->num_calls_finished_with_client_failed_to_send,
(gpr_atm)1);
}
if (finished_known_received) {
gpr_atm_full_fetch_add(&client_stats->num_calls_finished_known_received,
(gpr_atm)1);
}
}
void grpc_grpclb_client_stats_add_call_dropped_locked(
char* token, grpc_grpclb_client_stats* client_stats) {
// Increment num_calls_started and num_calls_finished.
gpr_atm_full_fetch_add(&client_stats->num_calls_started, (gpr_atm)1);
gpr_atm_full_fetch_add(&client_stats->num_calls_finished, (gpr_atm)1);
// Record the drop.
if (client_stats->drop_token_counts == nullptr) {
client_stats->drop_token_counts =
static_cast<grpc_grpclb_dropped_call_counts*>(
gpr_zalloc(sizeof(grpc_grpclb_dropped_call_counts)));
}
grpc_grpclb_dropped_call_counts* drop_token_counts =
client_stats->drop_token_counts;
for (size_t i = 0; i < drop_token_counts->num_entries; ++i) {
if (strcmp(drop_token_counts->token_counts[i].token, token) == 0) {
++drop_token_counts->token_counts[i].count;
return;
}
}
// Not found, so add a new entry. We double the size of the array each time.
size_t new_num_entries = 2;
while (new_num_entries < drop_token_counts->num_entries + 1) {
new_num_entries *= 2;
}
drop_token_counts->token_counts = static_cast<grpc_grpclb_drop_token_count*>(
gpr_realloc(drop_token_counts->token_counts,
new_num_entries * sizeof(grpc_grpclb_drop_token_count)));
grpc_grpclb_drop_token_count* new_entry =
&drop_token_counts->token_counts[drop_token_counts->num_entries++];
new_entry->token = gpr_strdup(token);
new_entry->count = 1;
}
static void atomic_get_and_reset_counter(int64_t* value, gpr_atm* counter) {
*value = static_cast<int64_t>(gpr_atm_acq_load(counter));
gpr_atm_full_fetch_add(counter, (gpr_atm)(-*value));
}
void grpc_grpclb_client_stats_get_locked(
grpc_grpclb_client_stats* client_stats, int64_t* num_calls_started,
int64_t* num_calls_finished,
int64_t* num_calls_finished_with_client_failed_to_send,
int64_t* num_calls_finished_known_received,
grpc_grpclb_dropped_call_counts** drop_token_counts) {
atomic_get_and_reset_counter(num_calls_started,
&client_stats->num_calls_started);
atomic_get_and_reset_counter(num_calls_finished,
&client_stats->num_calls_finished);
atomic_get_and_reset_counter(
num_calls_finished_with_client_failed_to_send,
&client_stats->num_calls_finished_with_client_failed_to_send);
atomic_get_and_reset_counter(
num_calls_finished_known_received,
&client_stats->num_calls_finished_known_received);
*drop_token_counts = client_stats->drop_token_counts;
client_stats->drop_token_counts = nullptr;
}
void grpc_grpclb_dropped_call_counts_destroy(
grpc_grpclb_dropped_call_counts* drop_entries) {
if (drop_entries != nullptr) {
for (size_t i = 0; i < drop_entries->num_entries; ++i) {
gpr_free(drop_entries->token_counts[i].token);
}
gpr_free(drop_entries->token_counts);
gpr_free(drop_entries);
}
}
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