note/src/runtime/CppCellRunner.cpp at dev · vixcpp/note · GitHub

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/**

* @file CppCellRunner.cpp

* @author Gaspard Kirira

* https://github.com/vixcpp/note

* Use of this source code is governed by a MIT license

* that can be found in the LICENSE file.

* Vix Note

#include <vix/note/runtime/CppCellRunner.hpp>

#include <array>

#include <chrono>

#include <cstdio>

#include <filesystem>

#include <fstream>

#include <sstream>

#include <string>

#include <system_error>

#include <utility>

#include <vector>

#include <cstdint>

#include <cstdlib>

#include <thread>

#ifdef _WIN32

#ifndef NOMINMAX

#define NOMINMAX

#endif

#ifndef WIN32_LEAN_AND_MEAN

#define WIN32_LEAN_AND_MEAN

#endif

#include <windows.h>

#else

#include <cerrno>

#include <csignal>

#include <fcntl.h>

#include <sys/wait.h>

#include <unistd.h>

#endif

namespace vix::note

{

namespace

{

struct ProcessOutput

{

int exitCode = 0;

bool timedOut = false;

bool outputLimitExceeded = false;

std::string failureMessage;

std::string stdoutText;

std::string stderrText;

std::string mergedText;

};

std::string shell_quote(const std::string &value)

{

#ifdef _WIN32

std::string out = "\"";

for (char c : value)

{

if (c == '"')

{

out += "\\\"";

}

else

{

out.push_back(c);

}

out += "\"";

return out;

#else

std::string out = "'";

for (char c : value)

{

if (c == '\'')

{

out += "'\\''";

}

else

{

out.push_back(c);

}

out += "'";

return out;

#endif

}

int normalize_exit_code(int rawCode)

{

#ifdef _WIN32

return rawCode;

#else

if (rawCode == -1)

{

return 1;

}

if (WIFEXITED(rawCode))

{

return WEXITSTATUS(rawCode);

}

if (WIFSIGNALED(rawCode))

{

return 128 + WTERMSIG(rawCode);

}

return rawCode;

#endif

}

bool contains_text(

const std::string &value,

const std::string &needle)

{

return value.find(needle) != std::string::npos;

}

std::string sanitize_file_stem(std::string value)

{

if (value.empty())

{

return "cell";

}

for (char &c : value)

{

const bool ok =

(c >= 'a' && c <= 'z') ||

(c >= 'A' && c <= 'Z') ||

(c >= '0' && c <= '9') ||

c == '-' ||

c == '_';

if (!ok)

{

c = '-';

}

return value;

}

std::uint64_t fnv1a_hash(const std::string &value)

{

std::uint64_t hash = 14695981039346656037ULL;

for (char raw_c : value)

{

const auto c = static_cast<unsigned char>(raw_c);

hash ^= static_cast<std::uint64_t>(c);

hash *= 1099511628211ULL;

}

return hash;

}

std::string lower_copy(std::string value)

{

for (char &c : value)

{

if (c >= 'A' && c <= 'Z')

{

c = static_cast<char>(c - 'A' + 'a');

}

return value;

}

bool env_flag_enabled(const char *name)

{

const char *value = std::getenv(name);

if (value == nullptr || *value == '\0')

{

return false;

}

const std::string text = lower_copy(value);

return text != "0" &&

text != "false" &&

text != "off" &&

text != "no";

}

std::string strip_ansi_codes(const std::string &text)

{

std::string out;

out.reserve(text.size());

for (std::size_t i = 0; i < text.size(); ++i)

{

const unsigned char c =

static_cast<unsigned char>(text[i]);

if (c != 0x1B)

{

out.push_back(static_cast<char>(c));

continue;

}

if (i + 1 >= text.size())

{

break;

}

if (text[i + 1] == '[')

{

i += 2;

while (i < text.size())

{

const unsigned char code =

static_cast<unsigned char>(text[i]);

if (code >= 0x40 && code <= 0x7E)

{

break;

}

++i;

}

continue;

}

if (text[i + 1] == ']')

{

i += 2;

while (i < text.size())

{

if (text[i] == '\a')

{

break;

}

if (text[i] == 0x1B && i + 1 < text.size() && text[i + 1] == '\\')

{

++i;

break;

}

++i;

}

continue;

}

++i;

}

return out;

}

std::string normalize_terminal_text(const std::string &text)

{

std::string out;

out.reserve(text.size());

for (std::size_t i = 0; i < text.size(); ++i)

{

if (text[i] == '\r')

{

if (i + 1 < text.size() && text[i + 1] == '\n')

{

continue;

}

out += '\n';

continue;

}

out += text[i];

}

return out;

}

std::filesystem::path make_temp_cpp_file(

const CppCellRunnerOptions &options,

const std::string &source,

const std::string &stableName,

std::string &err)

{

err.clear();

std::error_code ec;

std::filesystem::path root =

options.temporaryDirectory.empty()

? std::filesystem::temp_directory_path(ec) / "vix-note"

: options.temporaryDirectory;

if (ec)

{

err = "cannot resolve temporary directory: " + ec.message();

return {};

}

std::filesystem::create_directories(root, ec);

if (ec)

{

err = "cannot create temporary directory: " + root.string() + ": " + ec.message();

return {};

}

if (!stableName.empty())

{

return root / (sanitize_file_stem(stableName) + ".cpp");

}

const std::uint64_t hash =

fnv1a_hash(source);

return root / ("cell-" + std::to_string(hash) + ".cpp");

}

CppCellRunnerOptions effective_options(CppCellRunnerOptions options)

{

const ProjectContext &context = options.projectContext;

const bool projectMode =

options.enableProjectContext ||

env_flag_enabled("VIX_NOTE_PROJECT_CONTEXT") ||

env_flag_enabled("VIX_NOTE_REGISTRY_DEPS");

* Fast notebook mode.

* By default, do not attach every C++ cell to the full project/registry

* context. This keeps normal learning cells fast and avoids paying the

* first-run registry/build cost when the user only wants to test small C++

* snippets.

if (!context.enabled || !projectMode)

{

if (options.workingDirectory.empty())

{

std::error_code ec;

const std::filesystem::path root =

options.temporaryDirectory.empty()

? std::filesystem::temp_directory_path(ec) / "vix-note"

: options.temporaryDirectory;

if (!ec)

{

options.workingDirectory = root;

}

return options;

}

* Project/registry mode.

* Opt-in mode for cells that include registry libraries or project-local

* headers/libs. Slower on the first run, but required for linked packages.

if (options.workingDirectory.empty())

{

options.workingDirectory = context.effective_working_directory();

}

if (options.temporaryDirectory.empty() &&

!context.projectRoot.empty())

{

options.temporaryDirectory =

context.projectRoot / ".vix" / "note" / "tmp";

}

return options;

}

bool read_text_file(

const std::filesystem::path &path,

std::string &out)

{

out.clear();

std::ifstream in(path, std::ios::binary);

if (!in.is_open())

{

return false;

}

std::ostringstream buffer;

buffer << in.rdbuf();

if (in.bad())

{

return false;

}

out = buffer.str();

return true;

}

bool write_text_file_if_changed(

const std::filesystem::path &path,

const std::string &content,

std::string &err)

{

err.clear();

std::string existing;

if (read_text_file(path, existing) && existing == content)

{

return true;

}

std::ofstream out(path, std::ios::binary | std::ios::trunc);

if (!out.is_open())

{

err = "cannot write C++ cell file: " + path.string();

return false;

}

out << content;

if (!out.good())

{

err = "cannot write C++ cell file: " + path.string();

return false;

}

return true;

}

bool path_contains_parent_reference(const std::filesystem::path &path)

{

for (const auto &part : path)

{

if (part == "..")

{

return true;

}

return false;

}

std::string vix_run_file_argument(

const CppCellRunnerOptions &options,

const std::filesystem::path &file)

{

if (options.workingDirectory.empty())

{

return file.string();

}

std::error_code ec;

const std::filesystem::path relative =

std::filesystem::relative(

file,

options.workingDirectory,

ec);

if (!ec &&

!relative.empty() &&

!path_contains_parent_reference(relative))

{

return relative.generic_string();

}

return file.string();

}

std::string make_base_run_command(

const CppCellRunnerOptions &options,

const std::filesystem::path &file)

{

std::ostringstream cmd;

#ifdef _WIN32

if (!options.workingDirectory.empty())

{

cmd << "cd /D "

<< shell_quote(options.workingDirectory.string())

<< " && ";

}

cmd << "set VIX_COLOR=never && ";

#else

if (!options.workingDirectory.empty())

{

cmd << "cd "

<< shell_quote(options.workingDirectory.string())

<< " && ";

}

cmd << "VIX_COLOR=never ";

#endif

const std::string runFile =

vix_run_file_argument(options, file);

cmd << shell_quote(options.vixCommand)

<< " run "

<< shell_quote(runFile);

if (!options.runArgs.empty())

{

for (const auto &arg : options.runArgs)

{

cmd << " " << shell_quote(arg);

}

return cmd.str();

}

std::string make_merged_run_command(

const CppCellRunnerOptions &options,

const std::filesystem::path &file)

{

return make_base_run_command(options, file) + " 2>&1";

}

std::string make_separated_run_command(

const CppCellRunnerOptions &options,

const std::filesystem::path &file,

const std::filesystem::path &stdoutFile,

const std::filesystem::path &stderrFile)

{

std::ostringstream cmd;

cmd << make_base_run_command(options, file)

<< " > "

<< shell_quote(stdoutFile.string())

<< " 2> "

<< shell_quote(stderrFile.string());

return cmd.str();

}

bool append_limited(

std::string &out,

const char *data,

std::size_t size,

std::size_t maxBytes)

{

if (size == 0)

{

return true;

}

if (maxBytes == 0)

{

out.append(data, size);

return true;

}

if (out.size() >= maxBytes)

{

return false;

}

const std::size_t remaining =

maxBytes - out.size();

const std::size_t toCopy =

size < remaining ? size : remaining;

out.append(data, toCopy);

return toCopy == size;

}

std::uintmax_t safe_file_size_no_error(const std::filesystem::path &path)

{

std::error_code ec;

const std::uintmax_t size =

std::filesystem::file_size(path, ec);

if (ec)

{

return 0;

}

return size;

}

bool output_files_exceed_limit(

const std::filesystem::path *stdoutFile,

const std::filesystem::path *stderrFile,

std::size_t maxBytes)

{

if (maxBytes == 0)

{

return false;

}

std::uintmax_t total = 0;

if (stdoutFile != nullptr)

{

total += safe_file_size_no_error(*stdoutFile);

}

if (stderrFile != nullptr)

{

total += safe_file_size_no_error(*stderrFile);

}

return total > static_cast<std::uintmax_t>(maxBytes);

}

bool read_text_file_limited(

const std::filesystem::path &path,

std::string &out,

std::size_t maxBytes,

bool &truncated)

{

out.clear();

truncated = false;

std::ifstream in(path, std::ios::binary);

if (!in.is_open())

{

return false;

}

std::array<char, 4096> buffer{};

while (in)

{

in.read(buffer.data(), static_cast<std::streamsize>(buffer.size()));

const std::streamsize count = in.gcount();

if (count <= 0)

{

break;

}

const bool ok =

append_limited(

out,

buffer.data(),

static_cast<std::size_t>(count),

maxBytes);

if (!ok)

{

truncated = true;

break;

}

return true;

}

#ifdef _WIN32

bool append_pipe_output(

HANDLE pipe,

std::string &out,

std::size_t maxBytes)

{

bool withinLimit = true;

while (true)

{

DWORD available = 0;

if (!PeekNamedPipe(pipe, nullptr, 0, nullptr, &available, nullptr))

{

break;

}

if (available == 0)

{

break;

}

std::array<char, 4096> buffer{};

DWORD read = 0;

const DWORD toRead =

available < static_cast<DWORD>(buffer.size())

? available

: static_cast<DWORD>(buffer.size());

if (!ReadFile(pipe, buffer.data(), toRead, &read, nullptr) ||

read == 0)

{

break;

}

if (!append_limited(

out,

buffer.data(),

static_cast<std::size_t>(read),

maxBytes))

{

withinLimit = false;

break;

}

return withinLimit;

}

ProcessOutput run_command_controlled(

const std::string &command,

std::chrono::milliseconds timeout,

std::size_t maxOutputBytes,

const std::filesystem::path *stdoutFile = nullptr,

const std::filesystem::path *stderrFile = nullptr)

{

ProcessOutput output;

SECURITY_ATTRIBUTES security{};

security.nLength = sizeof(security);

security.bInheritHandle = TRUE;

security.lpSecurityDescriptor = nullptr;

HANDLE readPipe = nullptr;

HANDLE writePipe = nullptr;

if (!CreatePipe(&readPipe, &writePipe, &security, 0))

{

output.exitCode = 1;

output.failureMessage = "cannot create process pipe";

output.stderrText = output.failureMessage;

output.mergedText = output.failureMessage;

return output;

}

SetHandleInformation(readPipe, HANDLE_FLAG_INHERIT, 0);

STARTUPINFOA startup{};

startup.cb = sizeof(startup);

startup.dwFlags = STARTF_USESTDHANDLES;

startup.hStdInput = GetStdHandle(STD_INPUT_HANDLE);

startup.hStdOutput = writePipe;

startup.hStdError = writePipe;

PROCESS_INFORMATION process{};

std::string commandLine = "cmd.exe /C " + command;

const BOOL created =

CreateProcessA(

nullptr,

commandLine.data(),

nullptr,

TRUE,

CREATE_NO_WINDOW,

nullptr,

&startup,

&process);

CloseHandle(writePipe);

if (!created)

{

CloseHandle(readPipe);

output.exitCode = 1;

output.failureMessage = "cannot start C++ cell process";

output.stderrText = output.failureMessage;

output.mergedText = output.failureMessage;

return output;

}

const auto start = std::chrono::steady_clock::now();

const bool hasTimeout = timeout.count() > 0;

while (true)

{

if (!append_pipe_output(readPipe, output.mergedText, maxOutputBytes) ||

output_files_exceed_limit(stdoutFile, stderrFile, maxOutputBytes))

{

output.outputLimitExceeded = true;

output.exitCode = 125;

output.failureMessage = "C++ cell produced too much output";

TerminateProcess(process.hProcess, 125);

WaitForSingleObject(process.hProcess, 1000);

break;

}

const DWORD waitResult =

WaitForSingleObject(process.hProcess, 25);

if (waitResult == WAIT_OBJECT_0)

{

break;

}

if (hasTimeout)

{

const auto elapsed =

std::chrono::duration_cast<std::chrono::milliseconds>(

std::chrono::steady_clock::now() - start);

if (elapsed >= timeout)

{

output.timedOut = true;

output.exitCode = 124;

output.failureMessage =

"C++ cell timed out after " +

std::to_string(timeout.count()) +

" ms";

TerminateProcess(process.hProcess, 124);

WaitForSingleObject(process.hProcess, 1000);

break;

}

if (!append_pipe_output(readPipe, output.mergedText, maxOutputBytes) &&

!output.timedOut &&

!output.outputLimitExceeded)

{

output.outputLimitExceeded = true;

output.exitCode = 125;

output.failureMessage = "C++ cell produced too much output";

}

if (!output.timedOut && !output.outputLimitExceeded)

{

DWORD exitCode = 1;

if (GetExitCodeProcess(process.hProcess, &exitCode))

{

output.exitCode = static_cast<int>(exitCode);

}

else

{

output.exitCode = 1;

}

CloseHandle(process.hThread);

CloseHandle(process.hProcess);

CloseHandle(readPipe);

return output;

}

#else

bool append_fd_output(

int fd,

std::string &out,

std::size_t maxBytes)

{

bool withinLimit = true;

std::array<char, 4096> buffer{};

while (true)

{

const ssize_t n =

::read(fd, buffer.data(), buffer.size());

if (n > 0)

{

if (!append_limited(

out,

buffer.data(),

static_cast<std::size_t>(n),

maxBytes))

{

withinLimit = false;

break;

}

continue;

}

if (n == -1 && (errno == EAGAIN || errno == EWOULDBLOCK))

{

break;

}

break;

}

return withinLimit;

}

void terminate_process_group(pid_t pid)

{

if (pid <= 0)

{

return;

}

::kill(-pid, SIGTERM);

for (int i = 0; i < 10; ++i)

{

int status = 0;

const pid_t done = ::waitpid(pid, &status, WNOHANG);

if (done == pid)

{

return;

}

std::this_thread::sleep_for(std::chrono::milliseconds(20));

}

::kill(-pid, SIGKILL);

}

ProcessOutput run_command_controlled(

const std::string &command,

std::chrono::milliseconds timeout,

std::size_t maxOutputBytes,

const std::filesystem::path *stdoutFile = nullptr,

const std::filesystem::path *stderrFile = nullptr)

{

ProcessOutput output;

int pipeFd[2];

if (::pipe(pipeFd) != 0)

{

output.exitCode = 1;

output.failureMessage = "cannot create process pipe";

output.stderrText = output.failureMessage;

output.mergedText = output.failureMessage;

return output;

}

const pid_t pid = ::fork();

if (pid == -1)

{

::close(pipeFd[0]);

::close(pipeFd[1]);

output.exitCode = 1;

output.failureMessage = "cannot start C++ cell process";

output.stderrText = output.failureMessage;

output.mergedText = output.failureMessage;

return output;

}

if (pid == 0)

{

::setpgid(0, 0);

::close(pipeFd[0]);

::dup2(pipeFd[1], STDOUT_FILENO);

::dup2(pipeFd[1], STDERR_FILENO);

::close(pipeFd[1]);

::execl(

"/bin/sh",

"sh",

"-c",

command.c_str(),

static_cast<char *>(nullptr));

_exit(127);

}

::setpgid(pid, pid);

::close(pipeFd[1]);

const int flags = ::fcntl(pipeFd[0], F_GETFL, 0);

if (flags != -1)

View remainder of file in raw view

note/src/runtime/CppCellRunner.cpp at dev · vixcpp/note · GitHub

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