96 lines
2.2 KiB
JavaScript
96 lines
2.2 KiB
JavaScript
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"use strict";
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var defer = require('../lib/defer.js');
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var codec = require('../lib/object-codec.js');
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var sha1 = require('git-sha1');
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module.exports = mixin;
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var isHash = /^[0-9a-f]{40}$/;
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function mixin(repo) {
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var objects = {};
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var refs = {};
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repo.saveAs = saveAs;
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repo.loadAs = loadAs;
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repo.saveRaw = saveRaw;
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repo.loadRaw = loadRaw;
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repo.hasHash = hasHash;
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repo.readRef = readRef;
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repo.updateRef = updateRef;
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repo.listRefs = listRefs;
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function readRef(ref, callback) {
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return makeAsync(function () {
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return refs[ref];
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}, callback);
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}
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function listRefs(prefix, callback) {
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return makeAsync(function () {
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var regex = prefix && new RegExp("^" + prefix + "[/$]");
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var out = {};
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Object.keys(refs).forEach(function (name) {
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if (regex && !regex.test(name)) return;
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out[name] = refs[name];
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});
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return out;
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}, callback);
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}
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function updateRef(ref, hash, callback) {
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return makeAsync(function () {
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return (refs[ref] = hash);
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}, callback);
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}
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function hasHash(hash, callback) {
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return makeAsync(function () {
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if (!isHash.test(hash)) hash = refs[hash];
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return hash in objects;
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}, callback);
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}
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function saveAs(type, body, callback) {
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return makeAsync(function () {
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var buffer = codec.frame({type:type,body:body});
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var hash = sha1(buffer);
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objects[hash] = buffer;
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return hash;
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}, callback);
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}
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function saveRaw(hash, buffer, callback) {
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return makeAsync(function () {
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objects[hash] = buffer;
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}, callback);
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}
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function loadAs(type, hash, callback) {
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return makeAsync(function () {
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if (!isHash.test(hash)) hash = refs[hash];
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var buffer = objects[hash];
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if (!buffer) return [];
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var obj = codec.deframe(buffer, true);
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if (obj.type !== type) throw new TypeError("Type mismatch");
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return obj.body;
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}, callback);
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}
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function loadRaw(hash, callback) {
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return makeAsync(function () {
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return objects[hash];
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}, callback);
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}
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}
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function makeAsync(fn, callback) {
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if (!callback) return makeAsync.bind(null, fn);
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defer(function () {
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var out;
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try { out = fn(); }
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catch (err) { return callback(err); }
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callback(null, out);
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});
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}
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