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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/channel_trace.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/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 {
ChannelTrace::TraceEvent::TraceEvent(Severity severity, grpc_slice data,
RefCountedPtr<BaseNode> referenced_entity)
: severity_(severity),
data_(data),
timestamp_(grpc_millis_to_timespec(grpc_core::ExecCtx::Get()->Now(),
GPR_CLOCK_REALTIME)),
next_(nullptr),
referenced_entity_(std::move(referenced_entity)),
memory_usage_(sizeof(TraceEvent) + grpc_slice_memory_usage(data)) {}
ChannelTrace::TraceEvent::TraceEvent(Severity severity, grpc_slice data)
: severity_(severity),
data_(data),
timestamp_(grpc_millis_to_timespec(grpc_core::ExecCtx::Get()->Now(),
GPR_CLOCK_REALTIME)),
next_(nullptr),
memory_usage_(sizeof(TraceEvent) + grpc_slice_memory_usage(data)) {}
ChannelTrace::TraceEvent::~TraceEvent() { grpc_slice_unref_internal(data_); }
ChannelTrace::ChannelTrace(size_t max_event_memory)
: num_events_logged_(0),
event_list_memory_usage_(0),
max_event_memory_(max_event_memory),
head_trace_(nullptr),
tail_trace_(nullptr) {
if (max_event_memory_ == 0)
return; // tracing is disabled if max_event_memory_ == 0
gpr_mu_init(&tracer_mu_);
time_created_ = grpc_millis_to_timespec(grpc_core::ExecCtx::Get()->Now(),
GPR_CLOCK_REALTIME);
}
ChannelTrace::~ChannelTrace() {
if (max_event_memory_ == 0)
return; // tracing is disabled if max_event_memory_ == 0
TraceEvent* it = head_trace_;
while (it != nullptr) {
TraceEvent* to_free = it;
it = it->next();
Delete<TraceEvent>(to_free);
}
gpr_mu_destroy(&tracer_mu_);
}
void ChannelTrace::AddTraceEventHelper(TraceEvent* new_trace_event) {
++num_events_logged_;
// first event case
if (head_trace_ == nullptr) {
head_trace_ = tail_trace_ = new_trace_event;
}
// regular event add case
else {
tail_trace_->set_next(new_trace_event);
tail_trace_ = tail_trace_->next();
}
event_list_memory_usage_ += new_trace_event->memory_usage();
// maybe garbage collect the tail until we are under the memory limit.
while (event_list_memory_usage_ > max_event_memory_) {
TraceEvent* to_free = head_trace_;
event_list_memory_usage_ -= to_free->memory_usage();
head_trace_ = head_trace_->next();
Delete<TraceEvent>(to_free);
}
}
void ChannelTrace::AddTraceEvent(Severity severity, grpc_slice data) {
if (max_event_memory_ == 0)
return; // tracing is disabled if max_event_memory_ == 0
AddTraceEventHelper(New<TraceEvent>(severity, data));
}
void ChannelTrace::AddTraceEventWithReference(
Severity severity, grpc_slice data,
RefCountedPtr<BaseNode> referenced_entity) {
if (max_event_memory_ == 0)
return; // tracing is disabled if max_event_memory_ == 0
// create and fill up the new event
AddTraceEventHelper(
New<TraceEvent>(severity, data, std::move(referenced_entity)));
}
namespace {
const char* severity_string(ChannelTrace::Severity severity) {
switch (severity) {
case ChannelTrace::Severity::Info:
return "CT_INFO";
case ChannelTrace::Severity::Warning:
return "CT_WARNING";
case ChannelTrace::Severity::Error:
return "CT_ERROR";
default:
GPR_UNREACHABLE_CODE(return "CT_UNKNOWN");
}
}
} // anonymous namespace
void ChannelTrace::TraceEvent::RenderTraceEvent(grpc_json* json) const {
grpc_json* json_iterator = nullptr;
json_iterator = grpc_json_create_child(json_iterator, json, "description",
grpc_slice_to_c_string(data_),
GRPC_JSON_STRING, true);
json_iterator = grpc_json_create_child(json_iterator, json, "severity",
severity_string(severity_),
GRPC_JSON_STRING, false);
json_iterator = grpc_json_create_child(json_iterator, json, "timestamp",
gpr_format_timespec(timestamp_),
GRPC_JSON_STRING, true);
if (referenced_entity_ != nullptr) {
const bool is_channel =
(referenced_entity_->type() == BaseNode::EntityType::kTopLevelChannel ||
referenced_entity_->type() == BaseNode::EntityType::kInternalChannel);
char* uuid_str;
gpr_asprintf(&uuid_str, "%" PRIdPTR, referenced_entity_->uuid());
grpc_json* child_ref = grpc_json_create_child(
json_iterator, json, is_channel ? "channelRef" : "subchannelRef",
nullptr, GRPC_JSON_OBJECT, false);
json_iterator = grpc_json_create_child(
nullptr, child_ref, is_channel ? "channelId" : "subchannelId", uuid_str,
GRPC_JSON_STRING, true);
json_iterator = child_ref;
}
}
grpc_json* ChannelTrace::RenderJson() const {
if (max_event_memory_ == 0)
return nullptr; // tracing is disabled if max_event_memory_ == 0
grpc_json* json = grpc_json_create(GRPC_JSON_OBJECT);
grpc_json* json_iterator = nullptr;
if (num_events_logged_ > 0) {
json_iterator = grpc_json_add_number_string_child(
json, json_iterator, "numEventsLogged", num_events_logged_);
}
json_iterator = grpc_json_create_child(
json_iterator, json, "creationTimestamp",
gpr_format_timespec(time_created_), GRPC_JSON_STRING, true);
// only add in the event list if it is non-empty.
if (head_trace_ != nullptr) {
grpc_json* events = grpc_json_create_child(json_iterator, json, "events",
nullptr, GRPC_JSON_ARRAY, false);
json_iterator = nullptr;
TraceEvent* it = head_trace_;
while (it != nullptr) {
json_iterator = grpc_json_create_child(json_iterator, events, nullptr,
nullptr, GRPC_JSON_OBJECT, false);
it->RenderTraceEvent(json_iterator);
it = it->next();
}
}
return json;
}
} // namespace channelz
} // namespace grpc_core
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