Files: 420c091edd500452248946f7f519a3f0bd7b3a3e / index.js
2468 bytesRaw
1 | const Graph = require('ipld-graph-builder') |
2 | const multibase = require('multibase') |
3 | const Kernel = require('./kernel.js') |
4 | |
5 | module.exports = class Hypervisor { |
6 | constructor (opts) { |
7 | this.graph = new Graph(opts.dag) |
8 | this._vmInstances = new Map() |
9 | this._VMs = {} |
10 | } |
11 | |
12 | async getInstance (port, createIfNotFound = true) { |
13 | const id = await this.generateID(port) |
14 | let kernel = this._vmInstances.get(id) |
15 | if (!kernel && createIfNotFound) { |
16 | // load the the ID from the merkle store |
17 | await this.graph.tree(port.id, 1) |
18 | const parentID = await this.generateID({id: port.id['/'].parent}) |
19 | const parentKernel = await this._vmInstances.get(parentID) |
20 | const parentPort = parentKernel.entryPort |
21 | |
22 | kernel = await this.createInstanceFromPort(port, parentPort) |
23 | kernel.id = id |
24 | kernel.on('idle', () => { |
25 | this._vmInstances.delete(id) |
26 | }) |
27 | } |
28 | return kernel |
29 | } |
30 | |
31 | // given a port, wait untill its source contract has reached the threshold |
32 | // tick count |
33 | async wait (port, threshold, fromPort) { |
34 | let kernel = await this.getInstance(port, false) |
35 | if (kernel) { |
36 | return kernel.wait(threshold, fromPort) |
37 | } else { |
38 | return threshold |
39 | } |
40 | } |
41 | |
42 | async createInstance (type, state, entryPort = null, parentPort) { |
43 | const VM = this._VMs[type] |
44 | if (!state) { |
45 | state = { |
46 | '/': VM.createState() |
47 | } |
48 | } |
49 | |
50 | // create a new kernel instance |
51 | const kernel = new Kernel({ |
52 | entryPort: entryPort, |
53 | parentPort: parentPort, |
54 | hypervisor: this, |
55 | state: state, |
56 | VM: VM |
57 | }) |
58 | |
59 | const id = await this.generateID(entryPort) |
60 | // save the newly created instance |
61 | this._vmInstances.set(id, kernel) |
62 | await kernel.start() |
63 | return kernel |
64 | } |
65 | |
66 | /** |
67 | * opts.entryPort |
68 | * opts.parentPort |
69 | */ |
70 | async createInstanceFromPort (entryPort, parentPort) { |
71 | const state = entryPort.link |
72 | return this.createInstance(entryPort.type, state, entryPort, parentPort) |
73 | } |
74 | |
75 | async createStateRoot (container, ticks) { |
76 | await container.wait(ticks) |
77 | return this.graph.flush(container.state) |
78 | } |
79 | |
80 | async generateID (port) { |
81 | if (!port || !port.id) { |
82 | return null |
83 | } |
84 | let id = Object.assign({}, port.id) |
85 | id = await this.graph.flush(id) |
86 | id = id['/'] |
87 | if (Buffer.isBuffer(id)) { |
88 | id = multibase.encode('base58btc', id).toString() |
89 | } |
90 | return id |
91 | } |
92 | |
93 | registerContainer (type, vm) { |
94 | this._VMs[type] = vm |
95 | } |
96 | } |
97 |
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