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logging.h
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logging.h
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#pragma once
#include <cstdint>
#include <string>
#include <vector>
#include "common/common/logger.h"
#include "absl/strings/str_join.h"
#include "absl/strings/str_split.h"
#include "absl/synchronization/mutex.h"
#include "spdlog/spdlog.h"
namespace Envoy {
/**
* Provides a mechanism to temporarily set the logging level on
* construction, restoring its previous state on destruction.
*
* The log_level is the minimum log severity required to print messages.
* Messages below this loglevel will be suppressed.
*
* Note that during the scope of this object, command-line overrides, e.g.,
* --log-level trace, will not take effect.
*
* Also note: instantiating this setter should only occur when the system is
* in a quiescent state, e.g. at startup or between tests.
*
* This is intended for use in EXPECT_LOG_CONTAINS and similar macros.
*/
class LogLevelSetter {
public:
explicit LogLevelSetter(spdlog::level::level_enum log_level);
~LogLevelSetter();
private:
std::vector<spdlog::level::level_enum> previous_levels_;
};
/**
* Records log messages in a vector<string>, forwarding them to the previous
* delegate. This is useful for unit-testing log messages while still being able
* to see them on stderr.
*
* Also note: instantiating this sink should only occur when the system is
* in a quiescent state, e.g. at startup or between tests
*
* This is intended for use in EXPECT_LOG_CONTAINS and similar macros.
*/
class LogRecordingSink : public Logger::SinkDelegate {
public:
explicit LogRecordingSink(Logger::DelegatingLogSinkSharedPtr log_sink);
~LogRecordingSink() override;
// Logger::SinkDelegate
void log(absl::string_view msg) override;
void flush() override;
const std::vector<std::string>& messages() const { return messages_; }
private:
absl::Mutex mtx_;
std::vector<std::string> messages_ ABSL_GUARDED_BY(mtx_);
};
using StringPair = std::pair<std::string, std::string>;
using ExpectedLogMessages = std::vector<StringPair>;
// Below macros specify Envoy:: before class names so that the macro can be used outside of
// namespace Envoy.
// Alias for EXPECT_LOG_CONTAINS_ALL_OF_HELPER, with escaped=true
#define EXPECT_LOG_CONTAINS_ALL_OF_ESCAPED(expected_messages, stmt) \
EXPECT_LOG_CONTAINS_ALL_OF_HELPER(expected_messages, stmt, true)
// Alias for EXPECT_LOG_CONTAINS_ALL_OF_HELPER, with escaped=false
#define EXPECT_LOG_CONTAINS_ALL_OF(expected_messages, stmt) \
EXPECT_LOG_CONTAINS_ALL_OF_HELPER(expected_messages, stmt, false)
// Validates that when stmt is executed, log messages containing substr and loglevel will be
// emitted. Escaped=true sets the behavior to function like the --log-format-escaped CLI flag.
// Failure message e.g.,
//
// Logs:
// [2018-04-12 05:51:00.245][7290192][debug][upstream] grpc_mux_impl.cc:160] Received gRPC
// [2018-04-12 05:51:00.246][7290192][warning][upstream] grpc_mux_impl.cc:63] Called bar
// [2018-04-12 05:51:00.246][7290192][trace][upstream] grpc_mux_impl.cc:80] Sending foo
// Does NOT contain:
// 'warning', 'Too many sendDiscoveryRequest calls for baz’
// 'warning', 'Too man sendDiscoveryRequest calls for foo'
#define EXPECT_LOG_CONTAINS_ALL_OF_HELPER(expected_messages, stmt, escaped) \
do { \
ASSERT_FALSE(expected_messages.empty()) << "Expected messages cannot be empty."; \
Envoy::LogLevelSetter save_levels(spdlog::level::trace); \
Envoy::Logger::DelegatingLogSinkSharedPtr sink_ptr = Envoy::Logger::Registry::getSink(); \
sink_ptr->setShouldEscape(escaped); \
Envoy::LogRecordingSink log_recorder(sink_ptr); \
stmt; \
if (log_recorder.messages().empty()) { \
FAIL() << "Expected message(s), but NONE was recorded."; \
} \
Envoy::ExpectedLogMessages failed_expectations; \
for (const Envoy::StringPair& expected : expected_messages) { \
const auto log_message = \
std::find_if(log_recorder.messages().begin(), log_recorder.messages().end(), \
[&expected](const std::string& message) { \
return (message.find(expected.second) != std::string::npos) && \
(message.find(expected.first) != std::string::npos); \
}); \
if (log_message == log_recorder.messages().end()) { \
failed_expectations.push_back(expected); \
} \
} \
if (!failed_expectations.empty()) { \
std::string failed_message; \
absl::StrAppend(&failed_message, "\nLogs:\n ", absl::StrJoin(log_recorder.messages(), " "), \
"\n Do NOT contain:\n"); \
for (const auto& expectation : failed_expectations) { \
absl::StrAppend(&failed_message, " '", expectation.first, "', '", expectation.second, \
"'\n"); \
} \
FAIL() << failed_message; \
} \
} while (false)
// Validates that when stmt is executed, log message containing substr and loglevel will NOT be
// emitted. Failure message e.g.,
//
// Logs:
// [2018-04-12 05:51:00.245][7290192][warning][upstream] grpc_mux_impl.cc:160] Received gRPC
// [2018-04-12 05:51:00.246][7290192][trace][upstream] grpc_mux_impl.cc:63] Called bar
// Should NOT contain:
// 'warning', 'Received gRPC’
#define EXPECT_LOG_NOT_CONTAINS(loglevel, substr, stmt) \
do { \
Envoy::LogLevelSetter save_levels(spdlog::level::trace); \
Envoy::LogRecordingSink log_recorder(Envoy::Logger::Registry::getSink()); \
stmt; \
for (const std::string& message : log_recorder.messages()) { \
if ((message.find(substr) != std::string::npos) && \
(message.find(loglevel) != std::string::npos)) { \
FAIL() << "\nLogs:\n " << absl::StrJoin(log_recorder.messages(), " ") \
<< "\n Should NOT contain:\n '" << loglevel << "', '" << substr "'\n"; \
} \
} \
} while (false)
// Validates that when stmt is executed, the supplied substring matches at least one log message.
// Failure message e.g.,
//
// Logs:
// [2018-04-12 05:51:00.245][7290192][debug][upstream] grpc_mux_impl.cc:160] Received gRPC
// [2018-04-12 05:51:00.246][7290192][trace][upstream] grpc_mux_impl.cc:80] Sending foo
// Do NOT contain:
// 'warning', 'Too many sendDiscoveryRequest calls for baz’
#define EXPECT_LOG_CONTAINS(loglevel, substr, stmt) \
do { \
const Envoy::ExpectedLogMessages message{{loglevel, substr}}; \
EXPECT_LOG_CONTAINS_ALL_OF(message, stmt); \
} while (false)
// Validates that when stmt is executed, no logs will be emitted.
// Expected equality of these values:
// 0
// logs.size()
// Which is: 3
// Logs:
// [2018-04-12 05:51:00.245][7290192][debug][upstream] grpc_mux_impl.cc:160] Received gRPC
// [2018-04-12 05:51:00.246][7290192][trace][upstream] grpc_mux_impl.cc:80] Sending foo
#define EXPECT_NO_LOGS(stmt) \
do { \
Envoy::LogLevelSetter save_levels(spdlog::level::trace); \
Envoy::LogRecordingSink log_recorder(Envoy::Logger::Registry::getSink()); \
stmt; \
const std::vector<std::string>& logs = log_recorder.messages(); \
ASSERT_EQ(0, logs.size()) << " Logs:\n " << absl::StrJoin(logs, " "); \
} while (false)
} // namespace Envoy