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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/impl/codegen/port_platform.h>
#include "src/core/lib/channel/channelz.h"
#include <grpc/grpc.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "src/core/lib/channel/channelz_registry.h"
#include "src/core/lib/channel/status_util.h"
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/gprpp/memory.h"
#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/surface/channel.h"
#include "src/core/lib/transport/connectivity_state.h"
#include "src/core/lib/transport/error_utils.h"
namespace grpc_core {
namespace channelz {
namespace {
// TODO(ncteisen): move this function to a common helper location.
//
// returns an allocated string that represents tm according to RFC-3339, and,
// more specifically, follows:
// https://developers.google.com/protocol-buffers/docs/proto3#json
//
// "Uses RFC 3339, where generated output will always be Z-normalized and uses
// 0, 3, 6 or 9 fractional digits."
char* fmt_time(gpr_timespec tm) {
char time_buffer[35];
char ns_buffer[11]; // '.' + 9 digits of precision
struct tm* tm_info = localtime((const time_t*)&tm.tv_sec);
strftime(time_buffer, sizeof(time_buffer), "%Y-%m-%dT%H:%M:%S", tm_info);
snprintf(ns_buffer, 11, ".%09d", tm.tv_nsec);
// This loop trims off trailing zeros by inserting a null character that the
// right point. We iterate in chunks of three because we want 0, 3, 6, or 9
// fractional digits.
for (int i = 7; i >= 1; i -= 3) {
if (ns_buffer[i] == '0' && ns_buffer[i + 1] == '0' &&
ns_buffer[i + 2] == '0') {
ns_buffer[i] = '\0';
// Edge case in which all fractional digits were 0.
if (i == 1) {
ns_buffer[0] = '\0';
}
} else {
break;
}
}
char* full_time_str;
gpr_asprintf(&full_time_str, "%s%sZ", time_buffer, ns_buffer);
return full_time_str;
}
// TODO(ncteisen); move this to json library
grpc_json* add_num_str(grpc_json* parent, grpc_json* it, const char* name,
int64_t num) {
char* num_str;
gpr_asprintf(&num_str, "%" PRId64, num);
return grpc_json_create_child(it, parent, name, num_str, GRPC_JSON_STRING,
true);
}
} // namespace
ChannelNode::ChannelNode(grpc_channel* channel, size_t channel_tracer_max_nodes)
: channel_(channel), target_(nullptr), channel_uuid_(-1) {
trace_.Init(channel_tracer_max_nodes);
target_ = UniquePtr<char>(grpc_channel_get_target(channel_));
channel_uuid_ = ChannelzRegistry::Register(this);
gpr_atm_no_barrier_store(&last_call_started_millis_,
(gpr_atm)ExecCtx::Get()->Now());
}
ChannelNode::~ChannelNode() {
trace_.Destroy();
ChannelzRegistry::Unregister(channel_uuid_);
}
void ChannelNode::RecordCallStarted() {
gpr_atm_no_barrier_fetch_add(&calls_started_, (gpr_atm)1);
gpr_atm_no_barrier_store(&last_call_started_millis_,
(gpr_atm)ExecCtx::Get()->Now());
}
grpc_connectivity_state ChannelNode::GetConnectivityState() {
if (channel_ == nullptr) {
return GRPC_CHANNEL_SHUTDOWN;
} else {
// TODO(ncteisen): re-enable this once we have cleaned up all of the
// internal dependency issues.
// return grpc_channel_check_connectivity_state(channel_, false);
return GRPC_CHANNEL_IDLE;
}
}
char* ChannelNode::RenderJSON() {
// We need to track these three json objects to build our object
grpc_json* top_level_json = grpc_json_create(GRPC_JSON_OBJECT);
grpc_json* json = top_level_json;
grpc_json* json_iterator = nullptr;
// create and fill the ref child
json_iterator = grpc_json_create_child(json_iterator, json, "ref", nullptr,
GRPC_JSON_OBJECT, false);
json = json_iterator;
json_iterator = nullptr;
json_iterator = add_num_str(json, json_iterator, "channelId", channel_uuid_);
// reset json iterators to top level object
json = top_level_json;
json_iterator = nullptr;
// create and fill the data child.
grpc_json* data = grpc_json_create_child(json_iterator, json, "data", nullptr,
GRPC_JSON_OBJECT, false);
json = data;
json_iterator = nullptr;
// create and fill the connectivity state child.
grpc_connectivity_state connectivity_state = GetConnectivityState();
json_iterator = grpc_json_create_child(json_iterator, json, "state", nullptr,
GRPC_JSON_OBJECT, false);
json = json_iterator;
grpc_json_create_child(nullptr, json, "state",
grpc_connectivity_state_name(connectivity_state),
GRPC_JSON_STRING, false);
// reset the parent to be the data object.
json = data;
json_iterator = grpc_json_create_child(
json_iterator, json, "target", target_.get(), GRPC_JSON_STRING, false);
// fill in the channel trace if applicable
grpc_json* trace = trace_->RenderJSON();
if (trace != nullptr) {
// we manuall link up and fill the child since it was created for us in
// ChannelTrace::RenderJSON
json_iterator = grpc_json_link_child(json, trace, json_iterator);
trace->parent = json;
trace->value = nullptr;
trace->key = "trace";
trace->owns_value = false;
}
// reset the parent to be the data object.
json = data;
json_iterator = nullptr;
// We use -1 as sentinel values since proto default value for integers is
// zero, and the confuses the parser into thinking the value weren't present
json_iterator =
add_num_str(json, json_iterator, "callsStarted", calls_started_);
json_iterator =
add_num_str(json, json_iterator, "callsSucceeded", calls_succeeded_);
json_iterator =
add_num_str(json, json_iterator, "callsFailed", calls_failed_);
gpr_timespec ts =
grpc_millis_to_timespec(last_call_started_millis_, GPR_CLOCK_REALTIME);
json_iterator =
grpc_json_create_child(json_iterator, json, "lastCallStartedTimestamp",
fmt_time(ts), GRPC_JSON_STRING, true);
// render and return the over json object
char* json_str = grpc_json_dump_to_string(top_level_json, 0);
grpc_json_destroy(top_level_json);
return json_str;
}
} // namespace channelz
} // namespace grpc_core
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