1 | var crypto = require('crypto');
|
2 | var fs = require('fs');
|
3 | var path = require('path');
|
4 |
|
5 | var async = require('async');
|
6 |
|
7 |
|
8 | /**
|
9 | * Filter a list of files by mtime.
|
10 | * @param {Array.<string>} paths List of file paths.
|
11 | * @param {Date} time The comparison time.
|
12 | * @param {function(string, Date, function(boolean))} override Override.
|
13 | * @param {function(Err, Array.<string>)} callback Callback called with any
|
14 | * error and a list of files that have mtimes newer than the provided time.
|
15 | */
|
16 | var filterPathsByTime = exports.filterPathsByTime = function(paths, time,
|
17 | override, callback) {
|
18 | async.map(paths, fs.stat, function(err, stats) {
|
19 | if (err) {
|
20 | return callback(err);
|
21 | }
|
22 |
|
23 | var olderPaths = [];
|
24 | var newerPaths = paths.filter(function(filePath, index) {
|
25 | var newer = stats[index].mtime > time;
|
26 | if (!newer) {
|
27 | olderPaths.push(filePath);
|
28 | }
|
29 | return newer;
|
30 | });
|
31 |
|
32 | async.filter(olderPaths, function(filePath, include) {
|
33 | override(filePath, time, include);
|
34 | }, function(overrides) {
|
35 | callback(null, newerPaths.concat(overrides));
|
36 | });
|
37 | });
|
38 | };
|
39 |
|
40 |
|
41 | /**
|
42 | * Determine if any of the given files are newer than the provided time.
|
43 | * @param {Array.<string>} paths List of file paths.
|
44 | * @param {Date} time The comparison time.
|
45 | * @param {function(string, Date, function(boolean))} override Override.
|
46 | * @param {function(Err, boolean)} callback Callback called with any error and
|
47 | * a boolean indicating whether any one of the supplied files is newer than
|
48 | * the comparison time.
|
49 | */
|
50 | var anyNewer = exports.anyNewer = function(paths, time, override, callback) {
|
51 | var complete = 0;
|
52 | function iterate() {
|
53 | fs.stat(paths[complete], function(err, stats) {
|
54 | if (err) {
|
55 | return callback(err);
|
56 | }
|
57 | if (stats.mtime > time) {
|
58 | return callback(null, true);
|
59 | } else {
|
60 | override(paths[complete], time, function(include) {
|
61 | if (include) {
|
62 | callback(null, true);
|
63 | } else {
|
64 | ++complete;
|
65 | if (complete >= paths.length) {
|
66 | return callback(null, false);
|
67 | }
|
68 | iterate();
|
69 | }
|
70 | });
|
71 | }
|
72 | });
|
73 | }
|
74 | iterate();
|
75 | };
|
76 |
|
77 |
|
78 | /**
|
79 | * Filter a list of file config objects by time. Source files on the provided
|
80 | * objects are removed if they have not been modified since the provided time
|
81 | * or any dest file mtime for a dest file on the same object.
|
82 | * @param {Array.<Object>} files A list of Grunt file config objects. These
|
83 | * are returned from `grunt.task.normalizeMultiTaskFiles` and have a src
|
84 | * property (Array.<string>) and an optional dest property (string).
|
85 | * @param {Date} previous Comparison time.
|
86 | * @param {function(string, Date, function(boolean))} override Override.
|
87 | * @param {function(Error, Array.<Object>)} callback Callback called with
|
88 | * modified file config objects. Objects with no more src files are
|
89 | * filtered from the results.
|
90 | */
|
91 | var filterFilesByTime = exports.filterFilesByTime = function(files, previous,
|
92 | override, callback) {
|
93 | async.map(files, function(obj, done) {
|
94 | if (obj.dest) {
|
95 | fs.stat(obj.dest, function(err, stats) {
|
96 | if (err) {
|
97 | // dest file not yet created, use all src files
|
98 | return done(null, obj);
|
99 | }
|
100 | if (obj.src && obj.src.length === 1 && obj.src[0] === obj.dest) {
|
101 | // when src and dest are same, compare to previous
|
102 | return filterPathsByTime(obj.src, previous, override,
|
103 | function(err, src) {
|
104 | if (err) {
|
105 | return done(err);
|
106 | }
|
107 | done(null, {src: src, dest: obj.dest});
|
108 | });
|
109 | }
|
110 | return anyNewer(obj.src, stats.mtime, override, function(err, any) {
|
111 | done(err, any && obj);
|
112 | });
|
113 | });
|
114 | } else {
|
115 | filterPathsByTime(obj.src, previous, override, function(err, src) {
|
116 | if (err) {
|
117 | return done(err);
|
118 | }
|
119 | done(null, {src: src, dest: obj.dest});
|
120 | });
|
121 | }
|
122 | }, function(err, results) {
|
123 | if (err) {
|
124 | return callback(err);
|
125 | }
|
126 | // get rid of file config objects with no src files
|
127 | callback(null, results.filter(function(obj) {
|
128 | return obj && obj.src && obj.src.length > 0;
|
129 | }));
|
130 | });
|
131 | };
|
132 |
|
133 |
|
134 | /**
|
135 | * Get path to cached file hash for a target.
|
136 | * @param {string} cacheDir Path to cache dir.
|
137 | * @param {string} taskName Task name.
|
138 | * @param {string} targetName Target name.
|
139 | * @param {string} filePath Path to file.
|
140 | * @return {string} Path to hash.
|
141 | */
|
142 | var getHashPath = exports.getHashPath = function(cacheDir, taskName, targetName,
|
143 | filePath) {
|
144 | var hashedName = crypto.createHash('md5').update(filePath).digest('hex');
|
145 | return path.join(cacheDir, taskName, targetName, 'hashes', hashedName);
|
146 | };
|
147 |
|
148 |
|
149 | /**
|
150 | * Get an existing hash for a file (if it exists).
|
151 | * @param {string} filePath Path to file.
|
152 | * @param {string} cacheDir Cache directory.
|
153 | * @param {string} taskName Task name.
|
154 | * @param {string} targetName Target name.
|
155 | * @param {function(Error, string} callback Callback called with an error and
|
156 | * file hash (or null if the file doesn't exist).
|
157 | */
|
158 | var getExistingHash = exports.getExistingHash = function(filePath, cacheDir,
|
159 | taskName, targetName, callback) {
|
160 | var hashPath = getHashPath(cacheDir, taskName, targetName, filePath);
|
161 | fs.exists(hashPath, function(exists) {
|
162 | if (!exists) {
|
163 | return callback(null, null);
|
164 | }
|
165 | fs.readFile(hashPath, callback);
|
166 | });
|
167 | };
|
168 |
|
169 |
|
170 | /**
|
171 | * Generate a hash (md5sum) of a file contents.
|
172 | * @param {string} filePath Path to file.
|
173 | * @param {function(Error, string)} callback Callback called with any error and
|
174 | * the hash of the file contents.
|
175 | */
|
176 | var generateFileHash = exports.generateFileHash = function(filePath, callback) {
|
177 | var md5sum = crypto.createHash('md5');
|
178 | var stream = new fs.ReadStream(filePath);
|
179 | stream.on('data', function(chunk) {
|
180 | md5sum.update(chunk);
|
181 | });
|
182 | stream.on('error', callback);
|
183 | stream.on('end', function() {
|
184 | callback(null, md5sum.digest('hex'));
|
185 | });
|
186 | };
|
187 |
|
188 |
|
189 | /**
|
190 | * Filter files based on hashed contents.
|
191 | * @param {Array.<string>} paths List of paths to files.
|
192 | * @param {string} cacheDir Cache directory.
|
193 | * @param {string} taskName Task name.
|
194 | * @param {string} targetName Target name.
|
195 | * @param {function(Error, Array.<string>)} callback Callback called with any
|
196 | * error and a filtered list of files that only includes files with hashes
|
197 | * that are different than the cached hashes for the same files.
|
198 | */
|
199 | var filterPathsByHash = exports.filterPathsByHash = function(paths, cacheDir,
|
200 | taskName, targetName, callback) {
|
201 | async.filter(paths, function(filePath, done) {
|
202 | async.parallel({
|
203 | previous: function(cb) {
|
204 | getExistingHash(filePath, cacheDir, taskName, targetName, cb);
|
205 | },
|
206 | current: function(cb) {
|
207 | generateFileHash(filePath, cb);
|
208 | }
|
209 | }, function(err, hashes) {
|
210 | if (err) {
|
211 | return callback(err);
|
212 | }
|
213 | done(String(hashes.previous) !== String(hashes.current));
|
214 | });
|
215 | }, callback);
|
216 | };
|
217 |
|
218 |
|
219 | /**
|
220 | * Filter a list of file config objects based on comparing hashes of src files.
|
221 | * @param {Array.<Object>} files List of file config objects.
|
222 | * @param {string} taskName Task name.
|
223 | * @param {string} targetName Target name.
|
224 | * @param {function(Error, Array.<Object>)} callback Callback called with a
|
225 | * filtered list of file config objects. Object returned will only include
|
226 | * src files with hashes that are different than any cached hashes. Config
|
227 | * objects with no src files will be filtered from the list.
|
228 | */
|
229 | var filterFilesByHash = exports.filterFilesByHash = function(files, taskName,
|
230 | targetName, callback) {
|
231 | var modified = false;
|
232 | async.map(files, function(obj, done) {
|
233 |
|
234 | filterPathsByHash(obj.src, taskName, targetName, function(err, src) {
|
235 | if (err) {
|
236 | return done(err);
|
237 | }
|
238 | if (src.length) {
|
239 | modified = true;
|
240 | }
|
241 | done(null, {src: src, dest: obj.dest});
|
242 | });
|
243 |
|
244 | }, function(err, newerFiles) {
|
245 | callback(err, newerFiles, modified);
|
246 | });
|
247 | };
|
248 |
|
249 |
|
250 | /**
|
251 | * Get the path to the cached timestamp for a target.
|
252 | * @param {string} cacheDir Path to cache dir.
|
253 | * @param {string} taskName Task name.
|
254 | * @param {string} targetName Target name.
|
255 | * @return {string} Path to timestamp.
|
256 | */
|
257 | var getStampPath = exports.getStampPath = function(cacheDir, taskName,
|
258 | targetName) {
|
259 | return path.join(cacheDir, taskName, targetName, 'timestamp');
|
260 | };
|