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initial support for memory overlays (#563)
* initial support for memory overlays * name the option dryRun * drafts are working * add destroy
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,256 @@ | ||
| const b4a = require('b4a') | ||
| const { ASSERTION } = require('hypercore-errors') | ||
|
|
||
| class MemoryOverlay { | ||
| constructor (storage) { | ||
| this.storage = storage | ||
| this.head = null | ||
| this.auth = null | ||
| this.localKeyPair = null | ||
| this.encryptionKey = null | ||
| this.dataInfo = null | ||
| this.userData = null | ||
| this.blocks = null | ||
| this.treeNodes = null | ||
| this.bitfields = null | ||
| } | ||
|
|
||
| createReadBatch (read = this.storage.createReadBatch()) { | ||
| return new MemoryOverlayReadBatch(this, read) | ||
| } | ||
|
|
||
| createWriteBatch () { | ||
| return new MemoryOverlayWriteBatch(this) | ||
| } | ||
|
|
||
| merge (overlay) { | ||
| if (overlay.head !== null) this.head = overlay.head | ||
| if (overlay.auth !== null) this.auth = overlay.auth | ||
| if (overlay.localKeyPair !== null) this.localKeyPair = overlay.localKeyPair | ||
| if (overlay.encryptionKey !== null) this.encryptionKey = overlay.encryptionKey | ||
| if (overlay.dataInfo !== null) this.dataInfo = overlay.dataInfo | ||
| if (overlay.userData !== null) this.userData = mergeMap(this.userData, overlay.userData) | ||
| if (overlay.blocks !== null) this.blocks = mergeTip(this.blocks, overlay.blocks) | ||
| if (overlay.treeNodes !== null) this.treeNodes = mergeMap(this.treeNodes, overlay.treeNodes) | ||
| if (overlay.bitfields !== null) this.bitfields = mergeTip(this.bitfields, overlay.bitfields) | ||
| } | ||
| } | ||
|
|
||
| class TipList { | ||
| constructor () { | ||
| this.offset = 0 | ||
| this.data = [] | ||
| } | ||
|
|
||
| end () { | ||
| return this.offset + this.data.length | ||
| } | ||
|
|
||
| put (index, value) { | ||
| if (this.data.length === 0) { | ||
| this.offset = index | ||
| this.data.push(value) | ||
| return | ||
| } | ||
|
|
||
| if (this.data.length === index) { | ||
| this.push.push(value) | ||
| return | ||
| } | ||
|
|
||
| throw ASSERTION('Invalid put on tip list') | ||
| } | ||
|
|
||
| get (index) { | ||
| index -= this.offset | ||
| if (index >= this.data.length) return null | ||
| return this.data[index] | ||
| } | ||
|
|
||
| * [Symbol.iterator] () { | ||
| for (let i = 0; i < this.data.length; i++) { | ||
| yield [i + this.offset, this.data[i]] | ||
| } | ||
| } | ||
| } | ||
|
|
||
| module.exports = MemoryOverlay | ||
|
|
||
| class MemoryOverlayReadBatch { | ||
| constructor (overlay, read) { | ||
| this.read = read | ||
| this.overlay = overlay | ||
| } | ||
|
|
||
| async getCoreHead () { | ||
| return this.overlay.head !== null ? this.overlay.head : this.read.getCoreHead() | ||
| } | ||
|
|
||
| async getCoreAuth () { | ||
| return this.overlay.auth !== null ? this.overlay.auth : this.read.getCoreAuth() | ||
| } | ||
|
|
||
| async getLocalKeyPair () { | ||
| return this.overlay.localKeyPair !== null ? this.overlay.localKeyPair : this.read.getLocalKeyPair() | ||
| } | ||
|
|
||
| async getEncryptionKey () { | ||
| return this.overlay.encryptionKey !== null ? this.overlay.encryptionKey : this.read.getEncryptionKey() | ||
| } | ||
|
|
||
| async getDataInfo () { | ||
| return this.overlay.dataInfo !== null ? this.overlay.dataInfo : this.read.getDataInfo() | ||
| } | ||
|
|
||
| async getUserData (key) { | ||
| const hex = this.overlay.userData === null ? null : b4a.toString('hex', key) | ||
| return hex !== null && this.userData.has(hex) ? this.overlay.dataInfo.get(hex) : this.read.getUserData(key) | ||
| } | ||
|
|
||
| async hasBlock (index) { | ||
| if (this.overlay.blocks !== null && index >= this.overlay.blocks.offset) { | ||
| const blk = this.overlay.blocks.get(index) | ||
| if (blk !== null) return true | ||
| } | ||
| return this.read.hasBlock(index) | ||
| } | ||
|
|
||
| async getBlock (index, error) { | ||
| if (this.overlay.blocks !== null && index >= this.overlay.blocks.offset) { | ||
| const blk = this.overlay.blocks.get(index) | ||
| if (blk !== null) return blk | ||
| } | ||
| return this.read.getBlock(index, error) | ||
| } | ||
|
|
||
| async hasTreeNode (index) { | ||
| return (this.overlay.treeNodes !== null && this.overlay.treeNodes.has(index)) || this.read.hasTreeNode(index) | ||
| } | ||
|
|
||
| async getTreeNode (index, error) { | ||
| if (this.overlay.treeNodes !== null && this.overlay.treeNodes.has(index)) { | ||
| return this.overlay.treeNodes.get(index) | ||
| } | ||
| return this.read.getTreeNode(index, error) | ||
| } | ||
|
|
||
| async getBitfieldPage (index) { | ||
| if (this.overlay.bitfields !== null && index >= this.overlay.bitfields.offset) { | ||
| const page = this.overlay.bitfields.get(index) | ||
| if (page !== null) return page | ||
| } | ||
| return this.read.getBitfieldPage(index) | ||
| } | ||
|
|
||
| destroy () { | ||
| this.read.destroy() | ||
| } | ||
|
|
||
| flush () { | ||
| return this.read.flush() | ||
| } | ||
|
|
||
| tryFlush () { | ||
| this.read.tryFlush() | ||
| } | ||
| } | ||
|
|
||
| class MemoryOverlayWriteBatch { | ||
| constructor (storage) { | ||
| this.storage = storage | ||
| this.overlay = new MemoryOverlay() | ||
| } | ||
|
|
||
| setCoreHead (head) { | ||
| this.overlay.head = head | ||
| } | ||
|
|
||
| setCoreAuth (auth) { | ||
| this.overlay.auth = auth | ||
| } | ||
|
|
||
| setBatchPointer (name, pointer) { | ||
| throw ASSERTION('Not supported') | ||
| } | ||
|
|
||
| setDataDependency (dataInfo) { | ||
| throw ASSERTION('Not supported') | ||
| } | ||
|
|
||
| setLocalKeyPair (keyPair) { | ||
| this.overlay.localKeyPair = keyPair | ||
| } | ||
|
|
||
| setEncryptionKey (encryptionKey) { | ||
| this.overlay.encryptionKey = encryptionKey | ||
| } | ||
|
|
||
| setDataInfo (info) { | ||
| this.overlay.dataInfo = info | ||
| } | ||
|
|
||
| setUserData (key, value) { | ||
| if (this.overlay.userData === null) this.overlay.userData = new Map() | ||
| this.overlay.userData.set(b4a.toString(key, 'hex'), value) | ||
| } | ||
|
|
||
| putBlock (index, data) { | ||
| if (this.overlay.blocks === null) this.overlay.blocks = new TipList() | ||
| this.overlay.blocks.put(index, data) | ||
| } | ||
|
|
||
| deleteBlock (index) { | ||
| throw ASSERTION('Not supported yet, but will be') | ||
| } | ||
|
|
||
| deleteBlockRange (start, end) { | ||
| throw ASSERTION('Not supported yet, but will be') | ||
| } | ||
|
|
||
| putTreeNode (node) { | ||
| if (this.overlay.treeNodes === null) this.overlay.treeNodes = new Map() | ||
| this.overlay.treeNodes.set(node.index, node) | ||
| } | ||
|
|
||
| deleteTreeNode (index) { | ||
| throw ASSERTION('Not supported yet, but will be') | ||
| } | ||
|
|
||
| deleteTreeNodeRange (start, end) { | ||
| throw ASSERTION('Not supported yet, but will be') | ||
| } | ||
|
|
||
| putBitfieldPage (index, page) { | ||
| if (this.overlay.bitfields === null) this.overlay.bitfields = new TipList() | ||
| this.overlay.bitfields.put(index, page) | ||
| } | ||
|
|
||
| deleteBitfieldPage (index) { | ||
| throw new Error('Not supported yet, but will be') | ||
| } | ||
|
|
||
| deleteBitfieldPageRange (start, end) { | ||
| throw new Error('Not supported yet, but will be') | ||
| } | ||
|
|
||
| destroy () {} | ||
|
|
||
| flush () { | ||
| this.storage.merge(this.overlay) | ||
| return Promise.resolve() | ||
| } | ||
| } | ||
|
|
||
| function mergeMap (a, b) { | ||
| if (a === null) return b | ||
| for (const [key, value] of b) a.set(key, value) | ||
| return a | ||
| } | ||
|
|
||
| function mergeTip (a, b) { | ||
| if (a === null) return b | ||
| while (a.end() !== b.offset && b.offset >= a.offset && b.end() >= a.end()) a.data.pop() | ||
| if (a.end() !== b.offset) throw ASSERTION('Cannot merge tip list') | ||
| for (const data of b.data) a.data.push(data) | ||
| return a | ||
| } |
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