node/src/node_dtrace.cc at master · dscape/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"

#include <string.h>

#ifdef HAVE_DTRACE

#include "node_provider.h"

#elif HAVE_ETW

#include "node_win32_etw_provider.h"

#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_NET_SOCKET_READ(arg0, arg1)

#define NODE_NET_SOCKET_READ_ENABLED() (0)

#define NODE_NET_SOCKET_WRITE(arg0, arg1)

#define NODE_NET_SOCKET_WRITE_ENABLED() (0)

#define NODE_GC_START(arg0, arg1)

#define NODE_GC_DONE(arg0, arg1)

#endif

namespace node {

using namespace v8;

#define SLURP_STRING(obj, member, valp) \

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

return (ThrowException(Exception::Error(String::New("expected " \

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

} \

String::Utf8Value _##member(obj->Get(String::New(#member))); \

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

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

#define SLURP_INT(obj, member, valp) \

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

return (ThrowException(Exception::Error(String::New("expected " \

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

} \

*valp = obj->Get(String::New(#member))->ToInteger()->Value();

#define SLURP_OBJECT(obj, member, valp) \

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

return (ThrowException(Exception::Error(String::New("expected " \

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

} \

*valp = Local<Object>::Cast(obj->Get(String::New(#member)));

#define SLURP_CONNECTION(arg, conn) \

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

return (ThrowException(Exception::Error(String::New("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, 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 (ThrowException(Exception::Error(String::New("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 (ThrowException(Exception::Error(String::New("expected " \

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

} \

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

return (ThrowException(Exception::Error(String::New("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);

Handle<Value> DTRACE_NET_SERVER_CONNECTION(const Arguments& args) {

if (!NODE_NET_SERVER_CONNECTION_ENABLED())

return Undefined();

HandleScope scope;

SLURP_CONNECTION(args[0], conn);

NODE_NET_SERVER_CONNECTION(&conn);

return Undefined();

}

Handle<Value> DTRACE_NET_STREAM_END(const Arguments& args) {

if (!NODE_NET_STREAM_END_ENABLED())

return Undefined();

HandleScope scope;

SLURP_CONNECTION(args[0], conn);

NODE_NET_STREAM_END(&conn);

return Undefined();

}

Handle<Value> DTRACE_NET_SOCKET_READ(const Arguments& args) {

if (!NODE_NET_SOCKET_READ_ENABLED())

return Undefined();

HandleScope scope;

int nbytes;

SLURP_CONNECTION(args[0], conn);

if (!args[1]->IsNumber()) {

return (ThrowException(Exception::Error(String::New("expected "

"argument 1 to be number of bytes"))));

}

nbytes = args[1]->Int32Value();

NODE_NET_SOCKET_READ(&conn, nbytes);

return Undefined();

}

Handle<Value> DTRACE_NET_SOCKET_WRITE(const Arguments& args) {

if (!NODE_NET_SOCKET_WRITE_ENABLED())

return Undefined();

HandleScope scope;

int nbytes;

SLURP_CONNECTION(args[0], conn);

if (!args[1]->IsNumber()) {

return (ThrowException(Exception::Error(String::New("expected "

"argument 1 to be number of bytes"))));

}

nbytes = args[1]->Int32Value();

NODE_NET_SOCKET_WRITE(&conn, nbytes);

return Undefined();

}

Handle<Value> DTRACE_HTTP_SERVER_REQUEST(const Arguments& args) {

node_dtrace_http_server_request_t req;

if (!NODE_HTTP_SERVER_REQUEST_ENABLED())

return Undefined();

HandleScope scope;

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 (ThrowException(Exception::Error(String::New("expected "

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

Local<Value> strfwdfor = headers->Get(String::New("x-forwarded-for"));

String::Utf8Value fwdfor(strfwdfor);

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

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

SLURP_CONNECTION(args[1], conn);

NODE_HTTP_SERVER_REQUEST(&req, &conn);

return Undefined();

}

Handle<Value> DTRACE_HTTP_SERVER_RESPONSE(const Arguments& args) {

if (!NODE_HTTP_SERVER_RESPONSE_ENABLED())

return Undefined();

HandleScope scope;

SLURP_CONNECTION(args[0], conn);

NODE_HTTP_SERVER_RESPONSE(&conn);

return Undefined();

}

Handle<Value> DTRACE_HTTP_CLIENT_REQUEST(const Arguments& args) {

node_dtrace_http_client_request_t req;

char *header;

if (!NODE_HTTP_CLIENT_REQUEST_ENABLED())

return Undefined();

HandleScope scope;

* 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);

return Undefined();

}

Handle<Value> DTRACE_HTTP_CLIENT_RESPONSE(const Arguments& args) {

if (!NODE_HTTP_CLIENT_RESPONSE_ENABLED())

return Undefined();

HandleScope scope;

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

NODE_HTTP_CLIENT_RESPONSE(&conn);

return Undefined();

}

#define NODE_PROBE(name) #name, name

static int dtrace_gc_start(GCType type, GCCallbackFlags flags) {

NODE_GC_START(type, flags);

* We avoid the tail-call elimination of the USDT probe (which screws up

* args) by forcing a return of 0.

return 0;

}

static int dtrace_gc_done(GCType type, GCCallbackFlags flags) {

NODE_GC_DONE(type, flags);

return 0;

}

void InitDTrace(Handle<Object> target) {

static struct {

const char *name;

Handle<Value> (*func)(const Arguments&);

Persistent<FunctionTemplate> templ;

} tab[] = {

{ NODE_PROBE(DTRACE_NET_SERVER_CONNECTION) },

{ NODE_PROBE(DTRACE_NET_STREAM_END) },

{ NODE_PROBE(DTRACE_NET_SOCKET_READ) },

{ NODE_PROBE(DTRACE_NET_SOCKET_WRITE) },

{ NODE_PROBE(DTRACE_HTTP_SERVER_REQUEST) },

{ NODE_PROBE(DTRACE_HTTP_SERVER_RESPONSE) },

{ NODE_PROBE(DTRACE_HTTP_CLIENT_REQUEST) },

{ NODE_PROBE(DTRACE_HTTP_CLIENT_RESPONSE) },

{ NULL }

};

for (int i = 0; tab[i].name != NULL; i++) {

tab[i].templ = Persistent<FunctionTemplate>::New(

FunctionTemplate::New(tab[i].func));

target->Set(String::NewSymbol(tab[i].name), tab[i].templ->GetFunction());

}

#ifdef HAVE_ETW

init_etw();

#endif

#if defined HAVE_DTRACE || defined HAVE_ETW

v8::V8::AddGCPrologueCallback((GCPrologueCallback)dtrace_gc_start);

v8::V8::AddGCEpilogueCallback((GCEpilogueCallback)dtrace_gc_done);

#endif

}

node/src/node_dtrace.cc at master · dscape/node · GitHub

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