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Copy pathAddressAlreadyInUseRule.cpp
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355 lines (298 loc) · 7.72 KB
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/**
*
* @file AddressAlreadyInUseRule.cpp
* @author Gaspard Kirira
*
* Copyright 2025, Gaspard Kirira. All rights reserved.
* https://github.com/vixcpp/vix
* Use of this source code is governed by a MIT license
* that can be found in the LICENSE file.
*
* Vix.cpp
*
*/
#include <vix/cli/errors/runtime/IRuntimeErrorRule.hpp>
#include <vix/cli/errors/runtime/RuntimeRuleUtils.hpp>
#include <cctype>
#include <cstdlib>
#include <filesystem>
#include <iostream>
#include <memory>
#include <optional>
#include <regex>
#include <string>
#include <vector>
#include <vix/cli/Style.hpp>
using namespace vix::cli::style;
namespace vix::cli::errors::runtime
{
namespace
{
std::string trim_copy(const std::string &value)
{
std::size_t begin = 0;
while (begin < value.size() &&
std::isspace(
static_cast<unsigned char>(value[begin])) != 0)
{
++begin;
}
std::size_t end = value.size();
while (end > begin &&
std::isspace(
static_cast<unsigned char>(value[end - 1])) != 0)
{
--end;
}
return value.substr(begin, end - begin);
}
std::string lowercase_copy(std::string value)
{
for (char &character : value)
{
character = static_cast<char>(
std::tolower(
static_cast<unsigned char>(character)));
}
return value;
}
bool technical_details_enabled()
{
const char *level = std::getenv("VIX_LOG_LEVEL");
if (level == nullptr || *level == '\0')
return false;
const std::string value =
lowercase_copy(trim_copy(level));
return value == "debug" ||
value == "trace";
}
std::optional<int> try_extract_port(
const std::string &log)
{
/*
* Prefer an explicit "port <number>" marker.
*
* Do not accept a bare ':' before the number here.
* A pattern such as ':8081' also matches timestamps:
*
* 13:10:49
* ^^^
*
* and would incorrectly report port 10.
*/
static const std::regex re(
R"(\bport[ \t]*[:=]?[ \t]*([0-9]{1,5})\b)",
std::regex::icase);
std::smatch match;
if (!std::regex_search(log, match, re))
return std::nullopt;
if (match.size() < 2)
return std::nullopt;
try
{
const int port =
std::stoi(match[1].str());
if (port > 0 && port <= 65535)
return port;
}
catch (...)
{
return std::nullopt;
}
return std::nullopt;
}
std::string choose_message(
const std::string &log)
{
if (try_extract_port(log))
return "port is already in use";
return "address is already in use";
}
std::string choose_description(
const std::string &log)
{
if (const auto port = try_extract_port(log))
{
return "Port " +
std::to_string(*port) +
" is already being used by another process.";
}
return "This network address is already being used by another process.";
}
std::string choose_hint(
const std::string &log)
{
if (const auto port = try_extract_port(log))
{
return "stop the process using port " +
std::to_string(*port) +
" or choose another port";
}
return "stop the process using this address or choose another host or port";
}
std::vector<std::string>
source_patterns_for_addr_in_use()
{
return {
"bind(",
"listen(",
"SERVER_PORT",
"socket",
"port",
"host",
};
}
bool looks_like_addr_in_use_log(
const std::string &log)
{
if (icontains(log, "Address already in use") ||
icontains(log, "address already in use") ||
icontains(log, "EADDRINUSE"))
{
return true;
}
if (icontains(log, "port already in use"))
return true;
return false;
}
void print_error(
const std::string &message,
const std::string &description)
{
std::cerr << RED
<< "runtime error: "
<< message
<< RESET
<< "\n";
if (!description.empty())
{
std::cerr << " "
<< description
<< "\n";
}
}
void print_hint_and_location(
const std::string &hint,
const RuntimeLocation &location)
{
std::vector<std::string> hints;
if (!hint.empty())
hints.push_back(hint);
/*
* Print "at:" only when Vix found a real file and line.
*
* Do not use sourceFile as a fallback because
* "source: main.cpp" is not an exact error location.
*/
const std::string at =
location.valid()
? make_at_text(
location,
std::filesystem::path{})
: std::string{};
if (hints.empty() && at.empty())
return;
std::cerr << "\n";
print_runtime_hints_and_at(
hints,
at);
}
void print_debug_details(
const std::string &log,
const std::optional<int> port)
{
if (!technical_details_enabled())
return;
std::cerr << "\n"
<< GRAY
<< "technical details:"
<< RESET
<< "\n";
#if defined(__linux__)
if (port)
{
std::cerr << " inspect: lsof -i :"
<< *port
<< " or ss -lptn"
<< "\n";
}
#endif
print_runtime_log_excerpt(
log,
20);
}
} // namespace
class AddressAlreadyInUseRule final
: public IRuntimeErrorRule
{
public:
bool match(
const std::string &log,
const std::filesystem::path &sourceFile) const override
{
(void)sourceFile;
return looks_like_addr_in_use_log(log);
}
bool handle(
const std::string &log,
const std::filesystem::path &sourceFile) const override
{
const std::string message =
choose_message(log);
const std::string description =
choose_description(log);
const std::string hint =
choose_hint(log);
RuntimeLocation location =
find_best_runtime_location(
log,
sourceFile);
if (!location.valid())
{
/*
* Preserve the existing runtime-location contract.
*
* When the runtime log has no location, search the
* source for the most relevant network operation.
*/
location =
find_best_runtime_location_or_source_hint(
log,
sourceFile,
source_patterns_for_addr_in_use());
}
print_error(
message,
description);
if (location.valid())
{
const auto error =
make_runtime_location(
location.file,
location.line,
location.column,
message);
print_runtime_codeframe(error);
}
print_hint_and_location(
hint,
location);
/*
* Native runtime output and platform-specific inspection
* commands remain available through:
*
* VIX_LOG_LEVEL=debug vix run ...
*/
print_debug_details(
log,
try_extract_port(log));
return true;
}
};
std::unique_ptr<IRuntimeErrorRule>
makeAddressAlreadyInUseRule()
{
return std::make_unique<
AddressAlreadyInUseRule>();
}
} // namespace vix::cli::errors::runtime