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sea: use JSON configuration and blob content for SEA
PR-URL: #47125 Refs: nodejs/single-executable#58 Reviewed-By: Darshan Sen <raisinten@gmail.com>
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,80 @@ | ||
#include "json_parser.h" | ||
#include "node_errors.h" | ||
#include "node_v8_platform-inl.h" | ||
#include "util-inl.h" | ||
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namespace node { | ||
using v8::ArrayBuffer; | ||
using v8::Context; | ||
using v8::Isolate; | ||
using v8::Local; | ||
using v8::Object; | ||
using v8::String; | ||
using v8::Value; | ||
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static Isolate* NewIsolate(v8::ArrayBuffer::Allocator* allocator) { | ||
Isolate* isolate = Isolate::Allocate(); | ||
CHECK_NOT_NULL(isolate); | ||
per_process::v8_platform.Platform()->RegisterIsolate(isolate, | ||
uv_default_loop()); | ||
Isolate::CreateParams params; | ||
params.array_buffer_allocator = allocator; | ||
Isolate::Initialize(isolate, params); | ||
return isolate; | ||
} | ||
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void JSONParser::FreeIsolate(Isolate* isolate) { | ||
per_process::v8_platform.Platform()->UnregisterIsolate(isolate); | ||
isolate->Dispose(); | ||
} | ||
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JSONParser::JSONParser() | ||
: allocator_(ArrayBuffer::Allocator::NewDefaultAllocator()), | ||
isolate_(NewIsolate(allocator_.get())), | ||
handle_scope_(isolate_.get()), | ||
context_(isolate_.get(), Context::New(isolate_.get())), | ||
context_scope_(context_.Get(isolate_.get())) {} | ||
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bool JSONParser::Parse(const std::string& content) { | ||
DCHECK(!parsed_); | ||
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Isolate* isolate = isolate_.get(); | ||
Local<Context> context = context_.Get(isolate); | ||
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// It's not a real script, so don't print the source line. | ||
errors::PrinterTryCatch bootstrapCatch( | ||
isolate, errors::PrinterTryCatch::kDontPrintSourceLine); | ||
Local<Value> json_string_value; | ||
Local<Value> result_value; | ||
if (!ToV8Value(context, content).ToLocal(&json_string_value) || | ||
!json_string_value->IsString() || | ||
!v8::JSON::Parse(context, json_string_value.As<String>()) | ||
.ToLocal(&result_value) || | ||
!result_value->IsObject()) { | ||
return false; | ||
} | ||
content_.Reset(isolate, result_value.As<Object>()); | ||
parsed_ = true; | ||
return true; | ||
} | ||
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std::optional<std::string> JSONParser::GetTopLevelField( | ||
const std::string& field) { | ||
Isolate* isolate = isolate_.get(); | ||
Local<Context> context = context_.Get(isolate); | ||
Local<Object> content_object = content_.Get(isolate); | ||
Local<Value> value; | ||
// It's not a real script, so don't print the source line. | ||
errors::PrinterTryCatch bootstrapCatch( | ||
isolate, errors::PrinterTryCatch::kDontPrintSourceLine); | ||
if (!content_object | ||
->Get(context, OneByteString(isolate, field.c_str(), field.length())) | ||
.ToLocal(&value) || | ||
!value->IsString()) { | ||
return {}; | ||
} | ||
Utf8Value utf8_value(isolate, value); | ||
return utf8_value.ToString(); | ||
} | ||
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} // namespace node |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,39 @@ | ||
#ifndef SRC_JSON_PARSER_H_ | ||
#define SRC_JSON_PARSER_H_ | ||
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#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS | ||
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#include <memory> | ||
#include <optional> | ||
#include <string> | ||
#include "util.h" | ||
#include "v8.h" | ||
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namespace node { | ||
// This is intended to be used to get some top-level fields out of a JSON | ||
// without having to spin up a full Node.js environment that unnecessarily | ||
// complicates things. | ||
class JSONParser { | ||
public: | ||
JSONParser(); | ||
~JSONParser() {} | ||
bool Parse(const std::string& content); | ||
std::optional<std::string> GetTopLevelField(const std::string& field); | ||
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private: | ||
// We might want a lighter-weight JSON parser for this use case. But for now | ||
// using V8 is good enough. | ||
static void FreeIsolate(v8::Isolate* isolate); | ||
std::unique_ptr<v8::ArrayBuffer::Allocator> allocator_; | ||
DeleteFnPtr<v8::Isolate, FreeIsolate> isolate_; | ||
v8::HandleScope handle_scope_; | ||
v8::Global<v8::Context> context_; | ||
v8::Context::Scope context_scope_; | ||
v8::Global<v8::Object> content_; | ||
bool parsed_ = false; | ||
}; | ||
} // namespace node | ||
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#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS | ||
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#endif // SRC_JSON_PARSER_H_ |
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