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migrate importer to async IPLD format interface
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| 'use strict' | ||
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| const pullBlock = require('pull-block') | ||
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| module.exports = (size) => { | ||
| return pullBlock(size, { zeroPadding: false }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| 'use strict' | ||
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| const mh = require('multihashes') | ||
| const UnixFS = require('ipfs-unixfs') | ||
| const CID = require('cids') | ||
| const dagPB = require('ipld-dag-pb') | ||
| const mapValues = require('async/mapValues') | ||
| const parallel = require('async/parallel') | ||
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| const DAGLink = dagPB.DAGLink | ||
| const DAGNode = dagPB.DAGNode | ||
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| module.exports = (files, ipldResolver, source, callback) => { | ||
| // 1) convert files to a tree | ||
| const fileTree = createTree(files) | ||
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| if (Object.keys(fileTree).length === 0) { | ||
| return callback()// no dirs to be created | ||
| } | ||
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| // 2) create sizeIndex | ||
| const sizeIndex = createSizeIndex(files) | ||
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| // 3) bottom up flushing | ||
| traverse(fileTree, sizeIndex, null, ipldResolver, source, callback) | ||
| } | ||
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| /* | ||
| * createTree | ||
| * | ||
| * received an array of files with the format: | ||
| * { | ||
| * path: // full path | ||
| * multihash: // multihash of the dagNode | ||
| * size: // cumulative size | ||
| * } | ||
| * | ||
| * returns a JSON object that represents a tree where branches are the paths | ||
| * and the leaves are objects with file names and respective multihashes, such | ||
| * as: | ||
| * { | ||
| * foo: { | ||
| * bar: { | ||
| * baz.txt: <multihash> | ||
| * } | ||
| * } | ||
| * } | ||
| */ | ||
| function createTree (files) { | ||
| const fileTree = {} | ||
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| files.forEach((file) => { | ||
| let splitted = file.path.split('/') | ||
| if (splitted.length === 1) { | ||
| return // adding just one file | ||
| } | ||
| if (splitted[0] === '') { | ||
| splitted = splitted.slice(1) | ||
| } | ||
| var tmpTree = fileTree | ||
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| for (var i = 0; i < splitted.length; i++) { | ||
| if (!tmpTree[splitted[i]]) { | ||
| tmpTree[splitted[i]] = {} | ||
| } | ||
| if (i === splitted.length - 1) { | ||
| tmpTree[splitted[i]] = file.multihash | ||
| } else { | ||
| tmpTree = tmpTree[splitted[i]] | ||
| } | ||
| } | ||
| }) | ||
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| return fileTree | ||
| } | ||
|
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| /* | ||
| * create a size index that goes like: | ||
| * { <multihash>: <size> } | ||
| */ | ||
| function createSizeIndex (files) { | ||
| const sizeIndex = {} | ||
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| files.forEach((file) => { | ||
| sizeIndex[mh.toB58String(file.multihash)] = file.size | ||
| }) | ||
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| return sizeIndex | ||
| } | ||
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| /* | ||
| * expand the branches recursively (depth first), flush them first | ||
| * and then traverse through the bottoum up, flushing everynode | ||
| * | ||
| * Algorithm tl;dr; | ||
| * create a dirNode | ||
| * Object.keys | ||
| * If the value is an Object | ||
| * create a dir Node | ||
| * Object.keys | ||
| * Once finished, add the result as a link to the dir node | ||
| * If the value is not an object | ||
| * add as a link to the dirNode | ||
| */ | ||
| function traverse (tree, sizeIndex, path, ipldResolver, source, done) { | ||
| mapValues(tree, (node, key, cb) => { | ||
| if (isLeaf(node)) { | ||
| return cb(null, node) | ||
| } | ||
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| traverse(node, sizeIndex, path ? `${path}/${key}` : key, ipldResolver, source, cb) | ||
| }, (err, tree) => { | ||
| if (err) { | ||
| return done(err) | ||
| } | ||
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| // at this stage, all keys are multihashes | ||
| // create a dir node | ||
| // add all the multihashes as links | ||
| // return this new node multihash | ||
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| const keys = Object.keys(tree) | ||
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| const ufsDir = new UnixFS('directory') | ||
| const node = new DAGNode(ufsDir.marshal()) | ||
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| keys.forEach((key) => { | ||
| const b58mh = mh.toB58String(tree[key]) | ||
| const link = new DAGLink(key, sizeIndex[b58mh], tree[key]) | ||
| node.addRawLink(link) | ||
| }) | ||
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| parallel([ | ||
| (cb) => node.multihash(cb), | ||
| (cb) => node.size(cb) | ||
| ], (err, res) => { | ||
| if (err) { | ||
| return done(err) | ||
| } | ||
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| const multihash = res[0] | ||
| const size = res[1] | ||
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| sizeIndex[mh.toB58String(multihash)] = size | ||
| ipldResolver.put({ | ||
| node: node, | ||
| cid: new CID(multihash) | ||
| }, (err) => { | ||
| if (err) { | ||
| source.push(new Error('failed to store dirNode')) | ||
| } else if (path) { | ||
| source.push({ | ||
| path: path, | ||
| multihash: multihash, | ||
| size: size | ||
| }) | ||
| } | ||
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| done(null, multihash) | ||
| }) | ||
| }) | ||
| }) | ||
| } | ||
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| function isLeaf (value) { | ||
| return !(typeof value === 'object' && !Buffer.isBuffer(value)) | ||
| } |
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