node/src/api/exceptions.cc at main · nodejs/node · GitHub

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// This file contains implementation of error APIs exposed in node.h

#include "env-inl.h"

#include "node.h"

#include "node_errors.h"

#include "util-inl.h"

#include "uv.h"

#include "v8.h"

#include <cstring>

namespace node {

using v8::Context;

using v8::Exception;

using v8::Integer;

using v8::Isolate;

using v8::Local;

using v8::Object;

using v8::String;

using v8::Value;

Local<Value> ErrnoException(Isolate* isolate,

int errorno,

const char* syscall,

const char* msg,

const char* path) {

Environment* env = Environment::GetCurrent(isolate);

CHECK_NOT_NULL(env);

Local<Value> e;

Local<String> estring = OneByteString(isolate, errors::errno_string(errorno));

if (msg == nullptr || msg[0] == '\0') {

msg = strerror(errorno);

}

Local<String> message = OneByteString(isolate, msg);

Local<String> cons =

String::Concat(isolate, estring, FIXED_ONE_BYTE_STRING(isolate, ", "));

cons = String::Concat(isolate, cons, message);

Local<String> path_string;

if (path != nullptr) {

// FIXME(bnoordhuis) It's questionable to interpret the file path as UTF-8.

path_string = String::NewFromUtf8(isolate, path).ToLocalChecked();

}

if (path_string.IsEmpty() == false) {

cons = String::Concat(isolate, cons, FIXED_ONE_BYTE_STRING(isolate, " '"));

cons = String::Concat(isolate, cons, path_string);

cons = String::Concat(isolate, cons, FIXED_ONE_BYTE_STRING(isolate, "'"));

}

e = Exception::Error(cons);

Local<Context> context = env->context();

Local<Object> obj = e.As<Object>();

obj->Set(context,

env->errno_string(),

Integer::New(isolate, errorno)).Check();

obj->Set(context, env->code_string(), estring).Check();

if (path_string.IsEmpty() == false) {

obj->Set(context, env->path_string(), path_string).Check();

}

if (syscall != nullptr) {

obj->Set(context,

env->syscall_string(),

OneByteString(isolate, syscall)).Check();

}

return e;

}

static Local<String> StringFromPath(Isolate* isolate, const char* path) {

#ifdef _WIN32

if (strncmp(path, "\\\\?\\UNC\\", 8) == 0) {

return String::Concat(

isolate,

FIXED_ONE_BYTE_STRING(isolate, "\\\\"),

String::NewFromUtf8(isolate, path + 8).ToLocalChecked());

} else if (strncmp(path, "\\\\?\\", 4) == 0) {

return String::NewFromUtf8(isolate, path + 4).ToLocalChecked();

}

#endif

return String::NewFromUtf8(isolate, path).ToLocalChecked();

}

Local<Value> UVException(Isolate* isolate,

int errorno,

const char* syscall,

const char* msg,

const char* path,

const char* dest) {

Environment* env = Environment::GetCurrent(isolate);

CHECK_NOT_NULL(env);

if (!msg || !msg[0])

msg = uv_strerror(errorno);

Local<String> js_code = OneByteString(isolate, uv_err_name(errorno));

Local<String> js_syscall = OneByteString(isolate, syscall);

Local<String> js_path;

Local<String> js_dest;

Local<String> js_msg = js_code;

js_msg =

String::Concat(isolate, js_msg, FIXED_ONE_BYTE_STRING(isolate, ": "));

js_msg = String::Concat(isolate, js_msg, OneByteString(isolate, msg));

js_msg =

String::Concat(isolate, js_msg, FIXED_ONE_BYTE_STRING(isolate, ", "));

js_msg = String::Concat(isolate, js_msg, js_syscall);

if (path != nullptr) {

js_path = StringFromPath(isolate, path);

js_msg =

String::Concat(isolate, js_msg, FIXED_ONE_BYTE_STRING(isolate, " '"));

js_msg = String::Concat(isolate, js_msg, js_path);

js_msg =

String::Concat(isolate, js_msg, FIXED_ONE_BYTE_STRING(isolate, "'"));

}

if (dest != nullptr) {

js_dest = StringFromPath(isolate, dest);

js_msg = String::Concat(

isolate, js_msg, FIXED_ONE_BYTE_STRING(isolate, " -> '"));

js_msg = String::Concat(isolate, js_msg, js_dest);

js_msg =

String::Concat(isolate, js_msg, FIXED_ONE_BYTE_STRING(isolate, "'"));

}

Local<Object> e =

Exception::Error(js_msg)->ToObject(isolate->GetCurrentContext())

.ToLocalChecked();

Local<Context> context = env->context();

e->Set(context,

env->errno_string(),

Integer::New(isolate, errorno)).Check();

e->Set(context, env->code_string(), js_code).Check();

e->Set(context, env->syscall_string(), js_syscall).Check();

if (!js_path.IsEmpty())

e->Set(context, env->path_string(), js_path).Check();

if (!js_dest.IsEmpty())

e->Set(context, env->dest_string(), js_dest).Check();

return e;

}

#ifdef _WIN32

// Does about the same as strerror(),

// but supports all windows error messages

static const char* winapi_strerror(const int errorno, bool* must_free) {

char* errmsg = nullptr;

FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |

FORMAT_MESSAGE_IGNORE_INSERTS,

nullptr,

errorno,

MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

reinterpret_cast<LPSTR>(&errmsg),

nullptr);

if (errmsg) {

*must_free = true;

// Remove trailing newlines

for (int i = strlen(errmsg) - 1;

i >= 0 && (errmsg[i] == '\n' || errmsg[i] == '\r');

i--) {

errmsg[i] = '\0';

}

return errmsg;

} else {

// FormatMessage failed

*must_free = false;

return "Unknown error";

}

Local<Value> WinapiErrnoException(Isolate* isolate,

int errorno,

const char* syscall,

const char* msg,

const char* path) {

Environment* env = Environment::GetCurrent(isolate);

CHECK_NOT_NULL(env);

Local<Value> e;

bool must_free = false;

if (!msg || !msg[0]) {

msg = winapi_strerror(errorno, &must_free);

}

Local<String> message = OneByteString(isolate, msg);

if (path) {

Local<String> cons1 =

String::Concat(isolate, message, FIXED_ONE_BYTE_STRING(isolate, " '"));

Local<String> cons2 = String::Concat(

isolate,

cons1,

String::NewFromUtf8(isolate, path).ToLocalChecked());

Local<String> cons3 =

String::Concat(isolate, cons2, FIXED_ONE_BYTE_STRING(isolate, "'"));

e = Exception::Error(cons3);

} else {

e = Exception::Error(message);

}

Local<Context> context = env->context();

Local<Object> obj = e.As<Object>();

obj->Set(context, env->errno_string(), Integer::New(isolate, errorno))

.Check();

if (path != nullptr) {

obj->Set(context,

env->path_string(),

String::NewFromUtf8(isolate, path).ToLocalChecked())

.Check();

}

if (syscall != nullptr) {

obj->Set(context,

env->syscall_string(),

OneByteString(isolate, syscall))

.Check();

}

if (must_free) {

LocalFree(const_cast<char*>(msg));

}

return e;

}

#endif // _WIN32

// Implement the legacy name exposed in node.h. This has not been in fact

// fatal any more, as the user can handle the exception in the

// TryCatch by listening to `uncaughtException`.

// TODO(joyeecheung): deprecate it in favor of a more accurate name.

void FatalException(Isolate* isolate, const v8::TryCatch& try_catch) {

errors::TriggerUncaughtException(isolate, try_catch);

}

} // namespace node

node/src/api/exceptions.cc at main · nodejs/node · GitHub

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