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cleanup git branch for leveldb stuff
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,21 @@ | ||
| The MIT License | ||
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| Copyright (c) 2016 Jeromy Johnson | ||
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| 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: | ||
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| The above copyright notice and this permission notice shall be included in | ||
| all copies or substantial portions of the Software. | ||
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| 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. |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,37 @@ | ||
| package leveldb | ||
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| import ( | ||
| ds "github.com/ipfs/go-datastore" | ||
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| "github.com/syndtr/goleveldb/leveldb" | ||
| "github.com/syndtr/goleveldb/leveldb/opt" | ||
| ) | ||
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| type leveldbBatch struct { | ||
| b *leveldb.Batch | ||
| db *leveldb.DB | ||
| syncWrites bool | ||
| } | ||
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| // Batch returns a new levelDB batcher | ||
| func (d *Datastore) Batch() (ds.Batch, error) { | ||
| return &leveldbBatch{ | ||
| b: new(leveldb.Batch), | ||
| db: d.db, | ||
| syncWrites: d.syncWrites, | ||
| }, nil | ||
| } | ||
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| func (b *leveldbBatch) Put(key ds.Key, value []byte) error { | ||
| b.b.Put(key.Bytes(), value) | ||
| return nil | ||
| } | ||
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| func (b *leveldbBatch) Commit() error { | ||
| return b.db.Write(b.b, &opt.WriteOptions{Sync: b.syncWrites}) | ||
| } | ||
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| func (b *leveldbBatch) Delete(key ds.Key) error { | ||
| b.b.Delete(key.Bytes()) | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| package leveldb | ||
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| import ( | ||
| "errors" | ||
| "os" | ||
| "path/filepath" | ||
| "sync" | ||
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| ds "github.com/ipfs/go-datastore" | ||
| dsq "github.com/ipfs/go-datastore/query" | ||
| "github.com/syndtr/goleveldb/leveldb" | ||
| "github.com/syndtr/goleveldb/leveldb/opt" | ||
| "github.com/syndtr/goleveldb/leveldb/util" | ||
| "go.uber.org/atomic" | ||
| ) | ||
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| var ( | ||
| _ ds.Datastore = (*Datastore)(nil) | ||
| _ ds.TxnDatastore = (*Datastore)(nil) | ||
| // ErrClosed is an error message returned when the datastore is no longer open | ||
| ErrClosed = errors.New("datastore closed") | ||
| ) | ||
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| // Datastore is a go-datastore implement using leveldb | ||
| type Datastore struct { | ||
| db *leveldb.DB | ||
| path string | ||
| closed *atomic.Bool | ||
| syncWrites bool | ||
| close sync.Once | ||
| closeLock sync.RWMutex | ||
| } | ||
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| // Options is an alias of syndtr/goleveldb/opt.Options which might be extended | ||
| // in the future. | ||
| type Options = opt.Options | ||
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| // NewDatastore returns a new datastore backed by leveldb | ||
| func NewDatastore(path string, opts *Options) (*Datastore, error) { | ||
| noSync := opts.NoSync | ||
| db, err := leveldb.OpenFile(path, opts) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| ds := Datastore{ | ||
| db: db, | ||
| path: path, | ||
| closed: atomic.NewBool(false), | ||
| // if noSync is false this will be true | ||
| syncWrites: !noSync, | ||
| } | ||
| return &ds, nil | ||
| } | ||
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| // Put stores a key-value pair in leveldb | ||
| func (d *Datastore) Put(key ds.Key, value []byte) (err error) { | ||
| if d.closed.Load() { | ||
| return ErrClosed | ||
| } | ||
| return d.db.Put(key.Bytes(), value, &opt.WriteOptions{Sync: d.syncWrites}) | ||
| } | ||
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| // Sync is a noop | ||
| func (d *Datastore) Sync(prefix ds.Key) error { | ||
| return nil | ||
| } | ||
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| // Get returns the value corresponding to the key | ||
| func (d *Datastore) Get(key ds.Key) (value []byte, err error) { | ||
| if d.closed.Load() { | ||
| return nil, ErrClosed | ||
| } | ||
| val, err := d.db.Get(key.Bytes(), nil) | ||
| if err != nil { | ||
| return nil, handleGetError(err) | ||
| } | ||
| return val, nil | ||
| } | ||
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| // Has returns whether or not we have the key | ||
| func (d *Datastore) Has(key ds.Key) (exists bool, err error) { | ||
| if d.closed.Load() { | ||
| return false, ErrClosed | ||
| } | ||
| return ds.GetBackedHas(d, key) | ||
| } | ||
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| // GetSize returns the size of the associated key | ||
| func (d *Datastore) GetSize(key ds.Key) (size int, err error) { | ||
| if d.closed.Load() { | ||
| return 0, ErrClosed | ||
| } | ||
| return ds.GetBackedSize(d, key) | ||
| } | ||
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| // Delete removed the key from our datastore | ||
| func (d *Datastore) Delete(key ds.Key) (err error) { | ||
| if d.closed.Load() { | ||
| return ErrClosed | ||
| } | ||
| return d.db.Delete(key.Bytes(), &opt.WriteOptions{Sync: d.syncWrites}) | ||
| } | ||
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| // Query searches for keys in our datastore | ||
| func (d *Datastore) Query(q dsq.Query) (dsq.Results, error) { | ||
| if d.closed.Load() { | ||
| return nil, ErrClosed | ||
| } | ||
| // closing is only unsafe when there are pending iterators | ||
| // so we only lock when closing, and invoking iterators (query) | ||
| d.closeLock.Lock() | ||
| var rnge *util.Range | ||
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| // make a copy of the query for the fallback naive query implementation. | ||
| // don't modify the original so res.Query() returns the correct results. | ||
| qNaive := q | ||
| prefix := ds.NewKey(q.Prefix).String() | ||
| if prefix != "/" { | ||
| rnge = util.BytesPrefix([]byte(prefix + "/")) | ||
| qNaive.Prefix = "" | ||
| } | ||
| iter := d.db.NewIterator(rnge, nil) | ||
| res, err := query(iter, q, qNaive) | ||
| d.closeLock.Unlock() | ||
| return res, err | ||
| } | ||
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| // DiskUsage returns the current disk size used by this levelDB. | ||
| // For in-mem datastores, it will return 0. | ||
| func (d *Datastore) DiskUsage() (du uint64, err error) { | ||
| if d.closed.Load() { | ||
| return 0, ErrClosed | ||
| } | ||
| err = filepath.Walk(d.path, func(path string, info os.FileInfo, err error) error { | ||
| if err != nil { | ||
| return err | ||
| } | ||
| du += uint64(info.Size()) | ||
| return nil | ||
| }) | ||
| return | ||
| } | ||
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| // Close shuts down leveldb | ||
| func (d *Datastore) Close() (err error) { | ||
| if d.closed.Load() { | ||
| err = ErrClosed | ||
| } | ||
| d.close.Do(func() { | ||
| d.closeLock.Lock() | ||
| err = d.db.Close() | ||
| d.closed.Store(true) | ||
| d.closeLock.Unlock() | ||
| }) | ||
| return | ||
| } |
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