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Added sync ops and expose snapshots, share snapshots between iterators
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Frank Böhmer
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Jun 3, 2018
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| Original file line number | Diff line number | Diff line change |
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@@ -15,3 +15,4 @@ leakydb | |
| npm-debug.log | ||
| prebuilds/ | ||
| yarn.lock | ||
| package-lock.json | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| const extend = require('xtend'), | ||
| IteratorStream = require('level-iterator-stream'); | ||
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| const Iterator = require('./iterator'); | ||
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| function Snapshot (db, options) { | ||
| this.db = db; | ||
| this.binding = db.binding.databaseSnapshot(options) | ||
| } | ||
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| Snapshot.prototype.getSync = function (key) { | ||
| return this.binding.getSync(key); | ||
| } | ||
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| Snapshot.prototype.iterator = function (options) { | ||
| options = this.db._setupIteratorOptions(options); | ||
| console.log(JSON.stringify(options)); | ||
| options = extend({ databaseSnapshot: this.binding }, options) | ||
| return new Iterator(this.db, options); | ||
| } | ||
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| Snapshot.prototype.createReadStream = function(options) { | ||
| options = extend({ keys: true, values: true }, options) | ||
| if (typeof options.limit !== 'number') { options.limit = -1 } | ||
| return new IteratorStream(this.iterator(options), options) | ||
| } | ||
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| module.exports = Snapshot |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| /* Copyright (c) 2012-2018 LevelDOWN contributors | ||
| * See list at <https://github.com/level/leveldown#contributing> | ||
| * MIT License <https://github.com/level/leveldown/blob/master/LICENSE.md> | ||
| */ | ||
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| #include <node.h> | ||
| #include <node_buffer.h> | ||
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| #include "database.h" | ||
| #include "database_snapshot.h" | ||
| #include "common.h" | ||
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| namespace leveldown { | ||
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| static Nan::Persistent<v8::FunctionTemplate> database_snapshot_constructor; | ||
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| DatabaseSnapshot::DatabaseSnapshot ( | ||
| Database* database | ||
| , uint32_t id | ||
| , bool fillCache | ||
| , bool keyAsBuffer | ||
| , bool valueAsBuffer | ||
| ) : database(database) | ||
| , id(id) | ||
| , keyAsBuffer(keyAsBuffer) | ||
| , valueAsBuffer(valueAsBuffer) | ||
| { | ||
| Nan::HandleScope scope; | ||
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| options = new leveldb::ReadOptions(); | ||
| options->fill_cache = fillCache; | ||
| // get a snapshot of the current state | ||
| options->snapshot = database->NewSnapshot(); | ||
| }; | ||
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| DatabaseSnapshot::~DatabaseSnapshot () { | ||
| delete options; | ||
| }; | ||
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| void DatabaseSnapshot::Release () { | ||
| database->ReleaseDatabaseSnapshot(id); | ||
| }; | ||
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| leveldb::Snapshot* DatabaseSnapshot::GetSnapshot() { | ||
| return (leveldb::Snapshot*)options->snapshot; | ||
| }; | ||
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| NAN_METHOD(DatabaseSnapshot::GetSync) { | ||
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| if (info.Length() != 1) \ | ||
| return Nan::ThrowError("getSync() requires a single argument: key"); | ||
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| leveldown::DatabaseSnapshot* databaseSnapshot = | ||
| Nan::ObjectWrap::Unwrap<leveldown::DatabaseSnapshot>(info.This()); | ||
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| v8::Local<v8::Object> keyHandle = info[0].As<v8::Object>(); | ||
| LD_STRING_OR_BUFFER_TO_SLICE(key, keyHandle, key); | ||
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| leveldb::ReadOptions options; | ||
| options.fill_cache = true; | ||
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| std::string value; | ||
| leveldb::Status status = databaseSnapshot->database->GetFromDatabase(databaseSnapshot->options, key, value); | ||
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| DisposeStringOrBufferFromSlice(keyHandle, key); | ||
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| if (!status.ok()) | ||
| return Nan::ThrowError(status.ToString().c_str()); | ||
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| v8::Local<v8::Value> returnValue | ||
| = Nan::New<v8::String>((char*)value.data(), value.size()).ToLocalChecked(); | ||
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| info.GetReturnValue().Set(returnValue); | ||
| } | ||
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| NAN_METHOD(DatabaseSnapshot::Iterator) { | ||
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| } | ||
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| void DatabaseSnapshot::Init () { | ||
| v8::Local<v8::FunctionTemplate> tpl = | ||
| Nan::New<v8::FunctionTemplate>(DatabaseSnapshot::New); | ||
| database_snapshot_constructor.Reset(tpl); | ||
| tpl->SetClassName(Nan::New("DatabaseSnapshot").ToLocalChecked()); | ||
| tpl->InstanceTemplate()->SetInternalFieldCount(1); | ||
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| Nan::SetPrototypeMethod(tpl, "getSync", DatabaseSnapshot::GetSync); | ||
| Nan::SetPrototypeMethod(tpl, "iterator", DatabaseSnapshot::Iterator); | ||
| } | ||
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| v8::Local<v8::Object> DatabaseSnapshot::NewInstance ( | ||
| v8::Local<v8::Object> database | ||
| , v8::Local<v8::Number> id | ||
| , v8::Local<v8::Object> optionsObj | ||
| ) { | ||
| Nan::EscapableHandleScope scope; | ||
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| Nan::MaybeLocal<v8::Object> maybeInstance; | ||
| v8::Local<v8::Object> instance; | ||
| v8::Local<v8::FunctionTemplate> constructorHandle = | ||
| Nan::New<v8::FunctionTemplate>(database_snapshot_constructor); | ||
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| if (optionsObj.IsEmpty()) { | ||
| v8::Local<v8::Value> argv[2] = { database, id }; | ||
| maybeInstance = Nan::NewInstance(constructorHandle->GetFunction(), 2, argv); | ||
| } else { | ||
| v8::Local<v8::Value> argv[3] = { database, id, optionsObj }; | ||
| maybeInstance = Nan::NewInstance(constructorHandle->GetFunction(), 3, argv); | ||
| } | ||
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| if (maybeInstance.IsEmpty()) | ||
| Nan::ThrowError("Could not create new Snapshot instance"); | ||
| else | ||
| instance = maybeInstance.ToLocalChecked(); | ||
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| return scope.Escape(instance); | ||
| } | ||
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| NAN_METHOD(DatabaseSnapshot::New) { | ||
| Database* database = Nan::ObjectWrap::Unwrap<Database>(info[0]->ToObject()); | ||
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| v8::Local<v8::Value> id = info[1]; | ||
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| v8::Local<v8::Object> optionsObj; | ||
| if (info.Length() > 1 && info[2]->IsObject()) { | ||
| optionsObj = v8::Local<v8::Object>::Cast(info[2]); | ||
| } | ||
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| bool keyAsBuffer = BooleanOptionValue(optionsObj, "keyAsBuffer", true); | ||
| bool valueAsBuffer = BooleanOptionValue(optionsObj, "valueAsBuffer", true); | ||
| bool fillCache = BooleanOptionValue(optionsObj, "fillCache"); | ||
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| DatabaseSnapshot* databaseSnapshot = new DatabaseSnapshot( | ||
| database | ||
| , (uint32_t)id->Int32Value() | ||
| , fillCache | ||
| , keyAsBuffer | ||
| , valueAsBuffer | ||
| ); | ||
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| databaseSnapshot->Wrap(info.This()); | ||
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| info.GetReturnValue().Set(info.This()); | ||
| } | ||
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| } // namespace leveldown |
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