node/src/node_dtrace.cc at doc/stream-write-encoding · dev-script/node · GitHub

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// Copyright Joyent, Inc. and other Node contributors.

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

#include "node_dtrace.h"

#ifdef HAVE_DTRACE

#include "node_provider.h"

#elif HAVE_ETW

#include "node_win32_etw_provider-inl.h"

#else

#define NODE_HTTP_SERVER_REQUEST(arg0, arg1)

#define NODE_HTTP_SERVER_REQUEST_ENABLED() (0)

#define NODE_HTTP_SERVER_RESPONSE(arg0)

#define NODE_HTTP_SERVER_RESPONSE_ENABLED() (0)

#define NODE_HTTP_CLIENT_REQUEST(arg0, arg1)

#define NODE_HTTP_CLIENT_REQUEST_ENABLED() (0)

#define NODE_HTTP_CLIENT_RESPONSE(arg0)

#define NODE_HTTP_CLIENT_RESPONSE_ENABLED() (0)

#define NODE_NET_SERVER_CONNECTION(arg0)

#define NODE_NET_SERVER_CONNECTION_ENABLED() (0)

#define NODE_NET_STREAM_END(arg0)

#define NODE_NET_STREAM_END_ENABLED() (0)

#define NODE_GC_START(arg0, arg1, arg2)

#define NODE_GC_DONE(arg0, arg1, arg2)

#endif

#include "env-inl.h"

#include "node_errors.h"

#include <cstring>

namespace node {

using v8::Context;

using v8::FunctionCallbackInfo;

using v8::GCCallbackFlags;

using v8::GCType;

using v8::HandleScope;

using v8::Isolate;

using v8::Local;

using v8::Object;

using v8::Value;

#define SLURP_STRING(obj, member, valp) \

if (!(obj)->IsObject()) { \

return node::THROW_ERR_INVALID_ARG_TYPE(env, \

"expected object for " #obj " to contain string member " #member); \

} \

node::Utf8Value _##member(env->isolate(), \

obj->Get(env->context(), \

OneByteString(env->isolate(), #member)).ToLocalChecked()); \

if ((*(const char **)valp = *_##member) == nullptr) \

*(const char **)valp = "<unknown>";

#define SLURP_INT(obj, member, valp) \

if (!(obj)->IsObject()) { \

return node::THROW_ERR_INVALID_ARG_TYPE( \

env, \

"expected object for " #obj " to contain integer member " #member); \

} \

*valp = obj->Get(env->context(), \

OneByteString(env->isolate(), #member)).ToLocalChecked() \

->Int32Value(env->context()) \

.FromJust();

#define SLURP_OBJECT(obj, member, valp) \

if (!(obj)->IsObject()) { \

return node::THROW_ERR_INVALID_ARG_TYPE(env, \

"expected object for " #obj " to contain object member " #member); \

} \

*valp = Local<Object>::Cast(obj->Get(env->context(), \

OneByteString(env->isolate(), #member)).ToLocalChecked());

#define SLURP_CONNECTION(arg, conn) \

if (!(arg)->IsObject()) { \

return node::THROW_ERR_INVALID_ARG_TYPE(env, \

"expected argument " #arg " to be a connection object"); \

} \

node_dtrace_connection_t conn; \

Local<Object> _##conn = Local<Object>::Cast(arg); \

Local<Value> _handle = \

(_##conn)->Get(env->context(), \

FIXED_ONE_BYTE_STRING(env->isolate(), "_handle")) \

.ToLocalChecked(); \

if (_handle->IsObject()) { \

SLURP_INT(_handle.As<Object>(), fd, &conn.fd); \

} else { \

conn.fd = -1; \

} \

SLURP_STRING(_##conn, remoteAddress, &conn.remote); \

SLURP_INT(_##conn, remotePort, &conn.port); \

SLURP_INT(_##conn, bufferSize, &conn.buffered);

#define SLURP_CONNECTION_HTTP_CLIENT(arg, conn) \

if (!(arg)->IsObject()) { \

return node::THROW_ERR_INVALID_ARG_TYPE(env, \

"expected argument " #arg " to be a connection object"); \

} \

node_dtrace_connection_t conn; \

Local<Object> _##conn = Local<Object>::Cast(arg); \

SLURP_INT(_##conn, fd, &conn.fd); \

SLURP_STRING(_##conn, host, &conn.remote); \

SLURP_INT(_##conn, port, &conn.port); \

SLURP_INT(_##conn, bufferSize, &conn.buffered);

#define SLURP_CONNECTION_HTTP_CLIENT_RESPONSE(arg0, arg1, conn) \

if (!(arg0)->IsObject()) { \

return node::THROW_ERR_INVALID_ARG_TYPE(env, \

"expected argument " #arg0 " to be a connection object"); \

} \

if (!(arg1)->IsObject()) { \

return node::THROW_ERR_INVALID_ARG_TYPE(env, \

"expected argument " #arg1 " to be a connection object"); \

} \

node_dtrace_connection_t conn; \

Local<Object> _##conn = Local<Object>::Cast(arg0); \

SLURP_INT(_##conn, fd, &conn.fd); \

SLURP_INT(_##conn, bufferSize, &conn.buffered); \

_##conn = Local<Object>::Cast(arg1); \

SLURP_STRING(_##conn, host, &conn.remote); \

SLURP_INT(_##conn, port, &conn.port);

void DTRACE_NET_SERVER_CONNECTION(const FunctionCallbackInfo<Value>& args) {

if (!NODE_NET_SERVER_CONNECTION_ENABLED())

return;

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

SLURP_CONNECTION(args[0], conn);

NODE_NET_SERVER_CONNECTION(&conn, conn.remote, conn.port, conn.fd);

}

void DTRACE_NET_STREAM_END(const FunctionCallbackInfo<Value>& args) {

if (!NODE_NET_STREAM_END_ENABLED())

return;

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

SLURP_CONNECTION(args[0], conn);

NODE_NET_STREAM_END(&conn, conn.remote, conn.port, conn.fd);

}

void DTRACE_HTTP_SERVER_REQUEST(const FunctionCallbackInfo<Value>& args) {

node_dtrace_http_server_request_t req;

if (!NODE_HTTP_SERVER_REQUEST_ENABLED())

return;

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

HandleScope scope(env->isolate());

Local<Object> arg0 = Local<Object>::Cast(args[0]);

Local<Object> headers;

memset(&req, 0, sizeof(req));

req._un.version = 1;

SLURP_STRING(arg0, url, &req.url);

SLURP_STRING(arg0, method, &req.method);

SLURP_OBJECT(arg0, headers, &headers);

if (!(headers)->IsObject()) {

return node::THROW_ERR_INVALID_ARG_TYPE(env,

"expected object for request to contain string member headers");

}

Local<Value> strfwdfor = headers->Get(

env->context(), env->x_forwarded_string()).ToLocalChecked();

node::Utf8Value fwdfor(env->isolate(), strfwdfor);

if (!strfwdfor->IsString() || (req.forwardedFor = *fwdfor) == nullptr)

req.forwardedFor = const_cast<char*>("");

SLURP_CONNECTION(args[1], conn);

NODE_HTTP_SERVER_REQUEST(&req, &conn, conn.remote, conn.port, req.method, \

req.url, conn.fd);

}

void DTRACE_HTTP_SERVER_RESPONSE(const FunctionCallbackInfo<Value>& args) {

if (!NODE_HTTP_SERVER_RESPONSE_ENABLED())

return;

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

SLURP_CONNECTION(args[0], conn);

NODE_HTTP_SERVER_RESPONSE(&conn, conn.remote, conn.port, conn.fd);

}

void DTRACE_HTTP_CLIENT_REQUEST(const FunctionCallbackInfo<Value>& args) {

node_dtrace_http_client_request_t req;

char* header;

if (!NODE_HTTP_CLIENT_REQUEST_ENABLED())

return;

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

HandleScope scope(env->isolate());

* For the method and URL, we're going to dig them out of the header. This

* is not as efficient as it could be, but we would rather not force the

* caller here to retain their method and URL until the time at which

* DTRACE_HTTP_CLIENT_REQUEST can be called.

Local<Object> arg0 = Local<Object>::Cast(args[0]);

SLURP_STRING(arg0, _header, &header);

req.method = header;

while (*header != '\0' && *header != ' ')

header++;

if (*header != '\0')

*header++ = '\0';

req.url = header;

while (*header != '\0' && *header != ' ')

header++;

*header = '\0';

SLURP_CONNECTION_HTTP_CLIENT(args[1], conn);

NODE_HTTP_CLIENT_REQUEST(&req, &conn, conn.remote, conn.port, req.method, \

req.url, conn.fd);

}

void DTRACE_HTTP_CLIENT_RESPONSE(const FunctionCallbackInfo<Value>& args) {

if (!NODE_HTTP_CLIENT_RESPONSE_ENABLED())

return;

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

SLURP_CONNECTION_HTTP_CLIENT_RESPONSE(args[0], args[1], conn);

NODE_HTTP_CLIENT_RESPONSE(&conn, conn.remote, conn.port, conn.fd);

}

void dtrace_gc_start(Isolate* isolate,

GCType type,

GCCallbackFlags flags,

void* data) {

// Previous versions of this probe point only logged type and flags.

// That's why for reasons of backwards compatibility the isolate goes last.

NODE_GC_START(type, flags, isolate);

}

void dtrace_gc_done(Isolate* isolate,

GCType type,

GCCallbackFlags flags,

void* data) {

// Previous versions of this probe point only logged type and flags.

// That's why for reasons of backwards compatibility the isolate goes last.

NODE_GC_DONE(type, flags, isolate);

}

void InitDTrace(Environment* env) {

#ifdef HAVE_ETW

// ETW is neither thread-safe nor does it clean up resources on exit,

// so we can use it only on the main thread.

if (env->is_main_thread()) {

init_etw();

}

#endif

// We need to use the variant of GC callbacks that takes data to

// avoid running into DCHECKs when multiple Environments try to add

// the same callback to the same isolate multiple times.

env->isolate()->AddGCPrologueCallback(dtrace_gc_start, env);

env->isolate()->AddGCEpilogueCallback(dtrace_gc_done, env);

env->AddCleanupHook([](void* data) {

Environment* env = static_cast<Environment*>(data);

env->isolate()->RemoveGCPrologueCallback(dtrace_gc_start, env);

env->isolate()->RemoveGCEpilogueCallback(dtrace_gc_done, env);

}, env);

}

void InitializeDTrace(Local<Object> target,

Local<Value> unused,

Local<Context> context,

void* priv) {

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

#if defined HAVE_DTRACE || defined HAVE_ETW

# define NODE_PROBE(name) env->SetMethod(target, #name, name);

NODE_PROBE(DTRACE_NET_SERVER_CONNECTION)

NODE_PROBE(DTRACE_NET_STREAM_END)

NODE_PROBE(DTRACE_HTTP_SERVER_REQUEST)

NODE_PROBE(DTRACE_HTTP_SERVER_RESPONSE)

NODE_PROBE(DTRACE_HTTP_CLIENT_REQUEST)

NODE_PROBE(DTRACE_HTTP_CLIENT_RESPONSE)

# undef NODE_PROBE

#endif

}

} // namespace node

NODE_MODULE_CONTEXT_AWARE_INTERNAL(dtrace, node::InitializeDTrace)

node/src/node_dtrace.cc at doc/stream-write-encoding · dev-script/node · GitHub

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