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#include "dtrace_provider.h"
#include <nan.h>
#include <stdio.h>
namespace node {
using namespace v8;
DTraceProvider::DTraceProvider() : Nan::ObjectWrap() {
provider = NULL;
}
DTraceProvider::~DTraceProvider() {
usdt_provider_disable(provider);
usdt_provider_free(provider);
}
Nan::Persistent<FunctionTemplate> DTraceProvider::constructor_template;
void DTraceProvider::Initialize(v8::Local<Object> target) {
Nan::HandleScope scope;
Local<FunctionTemplate> t = Nan::New<FunctionTemplate>(DTraceProvider::New);
t->InstanceTemplate()->SetInternalFieldCount(1);
t->SetClassName(Nan::New<String>("DTraceProvider").ToLocalChecked());
constructor_template.Reset(t);
Nan::SetPrototypeMethod(t, "addProbe", DTraceProvider::AddProbe);
Nan::SetPrototypeMethod(t, "removeProbe", DTraceProvider::RemoveProbe);
Nan::SetPrototypeMethod(t, "enable", DTraceProvider::Enable);
Nan::SetPrototypeMethod(t, "disable", DTraceProvider::Disable);
Nan::SetPrototypeMethod(t, "fire", DTraceProvider::Fire);
target->Set(Nan::New<String>("DTraceProvider").ToLocalChecked(), t->GetFunction());
DTraceProbe::Initialize(target);
}
NAN_METHOD(DTraceProvider::New) {
Nan::HandleScope scope;
DTraceProvider *p = new DTraceProvider();
char module[128];
p->Wrap(info.This());
if (info.Length() < 1 || !info[0]->IsString()) {
Nan::ThrowTypeError("Must give provider name as argument");
return;
}
String::Utf8Value name(info[0]->ToString());
if (info.Length() == 2) {
if (!info[1]->IsString()) {
Nan::ThrowTypeError("Must give module name as argument");
return;
}
String::Utf8Value mod(info[1]->ToString());
(void) snprintf(module, sizeof (module), "%s", *mod);
} else if (info.Length() == 1) {
// If no module name is provided, develop a synthetic module name based
// on our address
(void) snprintf(module, sizeof (module), "mod-%p", p);
} else {
Nan::ThrowError("Expected only provider name and module as arguments");
return;
}
if ((p->provider = usdt_create_provider(*name, module)) == NULL) {
Nan::ThrowError("usdt_create_provider failed");
return;
}
info.GetReturnValue().Set(info.This());
}
NAN_METHOD(DTraceProvider::AddProbe) {
Nan::HandleScope scope;
const char *types[USDT_ARG_MAX];
v8::Local<Object> obj = info.Holder();
DTraceProvider *provider = Nan::ObjectWrap::Unwrap<DTraceProvider>(obj);
// create a DTraceProbe object
v8::Local<Function> klass =
Nan::New<FunctionTemplate>(DTraceProbe::constructor_template)->GetFunction();
v8::Local<Object> pd = klass->NewInstance();
// store in provider object
DTraceProbe *probe = Nan::ObjectWrap::Unwrap<DTraceProbe>(pd->ToObject());
obj->Set(info[0]->ToString(), pd);
// add probe to provider
for (int i = 0; i < USDT_ARG_MAX; i++) {
if (i < info.Length() - 1) {
String::Utf8Value type(info[i + 1]->ToString());
if (strncmp("json", *type, 4) == 0)
probe->arguments[i] = new DTraceJsonArgument();
else if (strncmp("char *", *type, 6) == 0)
probe->arguments[i] = new DTraceStringArgument();
else if (strncmp("int", *type, 3) == 0)
probe->arguments[i] = new DTraceIntegerArgument();
else
probe->arguments[i] = new DTraceStringArgument();
types[i] = strdup(probe->arguments[i]->Type());
probe->argc++;
}
}
String::Utf8Value name(info[0]->ToString());
probe->probedef = usdt_create_probe(*name, *name, probe->argc, types);
usdt_provider_add_probe(provider->provider, probe->probedef);
for (size_t i = 0; i < probe->argc; i++) {
free((char *)types[i]);
}
info.GetReturnValue().Set(pd);
}
NAN_METHOD(DTraceProvider::RemoveProbe) {
Nan::HandleScope scope;
v8::Local<Object> provider_obj = info.Holder();
DTraceProvider *provider = Nan::ObjectWrap::Unwrap<DTraceProvider>(provider_obj);
v8::Local<Object> probe_obj = Local<Object>::Cast(info[0]);
DTraceProbe *probe = Nan::ObjectWrap::Unwrap<DTraceProbe>(probe_obj);
v8::Local<String> name = Nan::New<String>(probe->probedef->name).ToLocalChecked();
provider_obj->Delete(name);
if (usdt_provider_remove_probe(provider->provider, probe->probedef) != 0) {
Nan::ThrowError(usdt_errstr(provider->provider));
return;
}
info.GetReturnValue().Set(Nan::True());
}
NAN_METHOD(DTraceProvider::Enable) {
Nan::HandleScope scope;
DTraceProvider *provider = Nan::ObjectWrap::Unwrap<DTraceProvider>(info.Holder());
if (usdt_provider_enable(provider->provider) != 0) {
Nan::ThrowError(usdt_errstr(provider->provider));
return;
}
return;
}
NAN_METHOD(DTraceProvider::Disable) {
Nan::HandleScope scope;
DTraceProvider *provider = Nan::ObjectWrap::Unwrap<DTraceProvider>(info.Holder());
if (usdt_provider_disable(provider->provider) != 0) {
Nan::ThrowError(usdt_errstr(provider->provider));
return;
}
return;
}
NAN_METHOD(DTraceProvider::Fire) {
Nan::HandleScope scope;
if (!info[0]->IsString()) {
Nan::ThrowTypeError("Must give probe name as first argument");
return;
}
if (!info[1]->IsFunction()) {
Nan::ThrowTypeError("Must give probe value callback as second argument");
return;
}
v8::Local<Object> provider = info.Holder();
v8::Local<Object> probe = Local<Object>::Cast(provider->Get(info[0]));
DTraceProbe *p = Nan::ObjectWrap::Unwrap<DTraceProbe>(probe);
if (p == NULL)
return;
p->_fire(info[1]);
info.GetReturnValue().Set(Nan::True());
}
extern "C" void
init(v8::Local<Object> target) {
DTraceProvider::Initialize(target);
}
NODE_MODULE(DTraceProviderBindings, init)
} // namespace node
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