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https://github.com/catchorg/Catch2.git
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Refactor pipe-based redirect to not always create new thread and pipe
This commit is contained in:
Martin Hořeňovský
parent
986ee2c793
commit
e63f3cc817
@ -19,6 +19,7 @@
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#if defined(CATCH_CONFIG_USE_ASYNC)
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#include <thread>
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#include <mutex>
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#endif
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#if defined( CATCH_CONFIG_NEW_CAPTURE ) || defined(CATCH_CONFIG_USE_ASYNC)
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@ -253,110 +254,6 @@ namespace Catch {
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#if defined( CATCH_CONFIG_USE_ASYNC )
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struct UniqueFileDescriptor final {
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constexpr UniqueFileDescriptor() noexcept;
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explicit UniqueFileDescriptor( int value ) noexcept;
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UniqueFileDescriptor( UniqueFileDescriptor const& ) = delete;
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constexpr UniqueFileDescriptor(
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UniqueFileDescriptor&& other ) noexcept;
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~UniqueFileDescriptor() noexcept;
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UniqueFileDescriptor&
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operator=( UniqueFileDescriptor const& ) = delete;
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UniqueFileDescriptor&
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operator=( UniqueFileDescriptor&& other ) noexcept;
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constexpr int get();
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private:
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int m_value;
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};
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struct OutputFileRedirector final {
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explicit OutputFileRedirector( std::FILE* file,
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std::string& result );
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OutputFileRedirector( OutputFileRedirector const& ) = delete;
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OutputFileRedirector( OutputFileRedirector&& ) = delete;
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~OutputFileRedirector() noexcept;
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OutputFileRedirector&
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operator=( OutputFileRedirector const& ) = delete;
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OutputFileRedirector& operator=( OutputFileRedirector&& ) = delete;
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private:
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std::FILE* m_file;
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int m_fd;
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UniqueFileDescriptor m_previous;
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std::thread m_readThread;
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};
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struct PipeRedirect final {
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PipeRedirect( std::string& output, std::string& error ):
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m_output{ stdout, output }, m_error{ stderr, error } {}
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private:
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OutputFileRedirector m_output;
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OutputFileRedirector m_error;
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};
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class PipeRedirectWrapper : public OutputRedirect {
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void activateImpl() override { m_redirect = Detail::make_unique<PipeRedirect>( m_stdout, m_stderr ); }
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void deactivateImpl() override { m_redirect.reset(); }
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std::string getStdout() override { return m_stdout; }
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std::string getStderr() override { return m_stderr; }
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void clearBuffers() override {
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m_stdout.clear();
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m_stderr.clear();
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}
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Detail::unique_ptr<PipeRedirect> m_redirect;
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std::string m_stdout, m_stderr;
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};
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static inline void close_or_throw( int descriptor ) {
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if ( close( descriptor ) ) {
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CATCH_INTERNAL_ERROR( "close-or-throw" );
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//CATCH_SYSTEM_ERROR( errno, std::generic_category() );
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}
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}
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static inline int dup_or_throw( int descriptor ) {
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int result{ dup( descriptor ) };
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if ( result == -1 ) {
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CATCH_INTERNAL_ERROR( "dup-or-throw" );
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//CATCH_SYSTEM_ERROR( errno, std::generic_category() );
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}
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return result;
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}
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static inline int dup2_or_throw( int sourceDescriptor,
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int destinationDescriptor ) {
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int result{ dup2( sourceDescriptor, destinationDescriptor ) };
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if ( result == -1 ) {
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CATCH_INTERNAL_ERROR( "dup2-or-throw" );
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//CATCH_SYSTEM_ERROR( errno, std::generic_category() );
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}
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return result;
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}
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static inline int fileno_or_throw( std::FILE* file ) {
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int result{ fileno( file ) };
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if ( result == -1 ) {
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CATCH_INTERNAL_ERROR( "fileno-or-throw" );
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//CATCH_SYSTEM_ERROR( errno, std::generic_category() );
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}
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return result;
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}
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static inline void pipe_or_throw( int descriptors[2] ) {
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# if defined( _MSC_VER )
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constexpr int defaultPipeSize{ 0 };
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@ -383,12 +280,53 @@ namespace Catch {
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if ( result == -1 ) {
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CATCH_INTERNAL_ERROR( "read-or-throw" );
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//CATCH_SYSTEM_ERROR( errno, std::generic_category() );
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// CATCH_SYSTEM_ERROR( errno, std::generic_category() );
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}
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return static_cast<size_t>( result );
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}
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static inline void close_or_throw( int descriptor ) {
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if ( close( descriptor ) ) {
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CATCH_INTERNAL_ERROR( "close-or-throw" );
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// CATCH_SYSTEM_ERROR( errno, std::generic_category() );
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}
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}
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static inline int dup_or_throw( int descriptor ) {
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int result{ dup( descriptor ) };
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if ( result == -1 ) {
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CATCH_INTERNAL_ERROR( "dup-or-throw" );
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// CATCH_SYSTEM_ERROR( errno, std::generic_category() );
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}
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return result;
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}
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static inline int dup2_or_throw( int sourceDescriptor,
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int destinationDescriptor ) {
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int result{ dup2( sourceDescriptor, destinationDescriptor ) };
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if ( result == -1 ) {
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CATCH_INTERNAL_ERROR( "dup2-or-throw" );
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// CATCH_SYSTEM_ERROR( errno, std::generic_category() );
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}
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return result;
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}
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static inline int fileno_or_throw( std::FILE* file ) {
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int result{ fileno( file ) };
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if ( result == -1 ) {
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CATCH_INTERNAL_ERROR( "fileno-or-throw" );
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// CATCH_SYSTEM_ERROR( errno, std::generic_category() );
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}
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return result;
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}
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static inline void fflush_or_throw( std::FILE* file ) {
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if ( std::fflush( file ) ) {
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CATCH_INTERNAL_ERROR( "fflush-or-throw" );
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@ -396,96 +334,95 @@ namespace Catch {
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}
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}
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constexpr UniqueFileDescriptor::UniqueFileDescriptor() noexcept:
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m_value{} {}
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class StreamPipeHandler {
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int m_originalFd = -1;
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int m_pipeReadEnd = -1;
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int m_pipeWriteEnd = -1;
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FILE* m_targetStream;
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std::mutex m_mutex;
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std::string m_captured;
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std::thread m_readThread;
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UniqueFileDescriptor::UniqueFileDescriptor( int value ) noexcept:
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m_value{ value } {}
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public:
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StreamPipeHandler( FILE* original ):
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m_originalFd( dup_or_throw( fileno( original ) ) ),
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m_targetStream(original)
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{
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CATCH_ENFORCE( m_originalFd >= 0, "Could not dup stream" );
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int pipe_fds[2];
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pipe_or_throw( pipe_fds );
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m_pipeReadEnd = pipe_fds[0];
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m_pipeWriteEnd = pipe_fds[1];
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constexpr UniqueFileDescriptor::UniqueFileDescriptor(
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UniqueFileDescriptor&& other ) noexcept:
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m_value{ other.m_value } {
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other.m_value = 0;
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}
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UniqueFileDescriptor::~UniqueFileDescriptor() noexcept {
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if ( m_value == 0 ) { return; }
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close_or_throw(
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m_value ); // std::terminate on failure (due to noexcept)
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}
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UniqueFileDescriptor& UniqueFileDescriptor::operator=(
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UniqueFileDescriptor&& other ) noexcept {
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std::swap( m_value, other.m_value );
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return *this;
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}
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constexpr int UniqueFileDescriptor::get() { return m_value; }
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static inline void
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create_pipe( UniqueFileDescriptor& readDescriptor,
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UniqueFileDescriptor& writeDescriptor ) {
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readDescriptor = {};
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writeDescriptor = {};
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int descriptors[2];
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pipe_or_throw( descriptors );
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readDescriptor = UniqueFileDescriptor{ descriptors[0] };
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writeDescriptor = UniqueFileDescriptor{ descriptors[1] };
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}
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static inline void read_thread( UniqueFileDescriptor&& file,
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std::string& result ) {
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std::string buffer{};
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constexpr size_t bufferSize{ 4096 };
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buffer.resize( bufferSize );
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size_t sizeRead{};
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while ( ( sizeRead = read_or_throw(
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file.get(), &buffer[0], bufferSize ) ) != 0 ) {
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result.append( buffer.data(), sizeRead );
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m_readThread = std::thread([this]() {
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constexpr size_t bufferSize = 4096;
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char buffer[bufferSize];
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size_t sizeRead;
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while ( ( sizeRead = read_or_throw(
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m_pipeReadEnd, buffer, bufferSize ) ) != 0 ) {
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std::unique_lock<std::mutex> _( m_mutex );
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m_captured.append( buffer, sizeRead );
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}
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});
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}
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}
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OutputFileRedirector::OutputFileRedirector( FILE* file,
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std::string& result ):
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m_file{ file },
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m_fd{ fileno_or_throw( m_file ) },
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m_previous{ dup_or_throw( m_fd ) } {
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fflush_or_throw( m_file );
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~StreamPipeHandler() {
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close_or_throw( m_pipeWriteEnd );
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m_readThread.join();
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}
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UniqueFileDescriptor readDescriptor{};
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UniqueFileDescriptor writeDescriptor{};
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create_pipe( readDescriptor, writeDescriptor );
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std::string getCapturedOutput() {
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std::unique_lock<std::mutex> _( m_mutex );
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return m_captured;
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}
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// Anonymous pipes have a limited buffer and require an active
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// reader to ensure the writer does not become blocked. Use a
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// separate thread to ensure the buffer does not get stuck full.
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m_readThread =
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std::thread{ [readDescriptor{ CATCH_MOVE( readDescriptor ) },
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&result]() mutable {
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read_thread( CATCH_MOVE( readDescriptor ), result );
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} };
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void clearCapturedOutput() {
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std::unique_lock<std::mutex> _( m_mutex );
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m_captured.clear();
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}
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// Replace the stdout or stderr file descriptor with the write end
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// of the pipe.
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dup2_or_throw( writeDescriptor.get(), m_fd );
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}
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void startCapture() {
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fflush_or_throw( m_targetStream );
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int ret = dup2_or_throw( m_pipeWriteEnd, fileno( m_targetStream ) );
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CATCH_ENFORCE( ret >= 0,
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"dup2 pipe-write -> original stream failed " << errno );
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}
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void stopCapture() {
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fflush_or_throw( m_targetStream );
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int ret = dup2_or_throw( m_originalFd, fileno( m_targetStream ) );
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CATCH_ENFORCE( ret >= 0,
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"dup2 of original fd -> original stream failed " << errno );
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}
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};
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OutputFileRedirector::~OutputFileRedirector() noexcept {
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fflush_or_throw(
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m_file ); // std::terminate on failure (due to noexcept)
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// Restore the original stdout or stderr file descriptor.
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dup2_or_throw(
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m_previous.get(),
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m_fd ); // std::terminate on failure (due to noexcept)
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if ( m_readThread.joinable() ) { m_readThread.join(); }
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}
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class PipeRedirect : public OutputRedirect {
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private:
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StreamPipeHandler m_stdout;
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StreamPipeHandler m_stderr;
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public:
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PipeRedirect():
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m_stdout(stdout),
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m_stderr(stderr){}
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void activateImpl() override {
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m_stdout.startCapture();
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m_stderr.startCapture();
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}
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void deactivateImpl() override {
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m_stdout.stopCapture();
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m_stderr.stopCapture();
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}
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std::string getStdout() override {
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return m_stdout.getCapturedOutput();
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}
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std::string getStderr() override {
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return m_stderr.getCapturedOutput();
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}
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void clearBuffers() override {
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m_stdout.clearCapturedOutput();
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m_stderr.clearCapturedOutput();
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}
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};
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#endif // CATCH_CONFIG_USE_ASYNC
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@ -518,7 +455,7 @@ namespace Catch {
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return Detail::make_unique<FileRedirect>();
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#else
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//return Detail::make_unique<StreamRedirect>();
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return Detail::make_unique<PipeRedirectWrapper>();
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return Detail::make_unique<PipeRedirect>();
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#endif
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} else {
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return Detail::make_unique<NoopRedirect>();
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