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Factor out try/cartch duplication in nodefs code. NFC (#21922)
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2 files changed

+105
-168
lines changed

2 files changed

+105
-168
lines changed

‎src/library_nodefs.js‎

Lines changed: 40 additions & 86 deletions
Original file line numberDiff line numberDiff line change
@@ -49,6 +49,17 @@ addToLibrary({
4949
#endif
5050
return ERRNO_CODES[code];
5151
},
52+
tryFSOperation(f) {
53+
try {
54+
return f();
55+
} catch (e) {
56+
if (!e.code) throw e;
57+
// node under windows can return code 'UNKNOWN' here:
58+
// https://github.com/emscripten-core/emscripten/issues/15468
59+
if (e.code === 'UNKNOWN') throw new FS.ErrnoError({{{ cDefs.EINVAL }}});
60+
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
61+
}
62+
},
5263
mount(mount) {
5364
#if ASSERTIONS
5465
assert(ENVIRONMENT_IS_NODE);
@@ -66,18 +77,15 @@ addToLibrary({
6677
},
6778
getMode(path) {
6879
var stat;
69-
try {
80+
return NODEFS.tryFSOperation(() => {
7081
stat = fs.lstatSync(path);
7182
if (NODEFS.isWindows) {
7283
// Node.js on Windows never represents permission bit 'x', so
7384
// propagate read bits to execute bits
7485
stat.mode |= (stat.mode & {{{ cDefs.S_IRUSR | cDefs.S_IRGRP | cDefs.S_IROTH }}}) >> 2;
7586
}
76-
} catch (e) {
77-
if (!e.code) throw e;
78-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
79-
}
80-
return stat.mode;
87+
return stat.mode;
88+
});
8189
},
8290
realPath(node) {
8391
var parts = [];
@@ -109,17 +117,14 @@ addToLibrary({
109117
}
110118
return newFlags;
111119
},
120+
112121
node_ops: {
113122
getattr(node) {
114123
var path = NODEFS.realPath(node);
115124
var stat;
116-
try {
117-
stat = fs.lstatSync(path);
118-
} catch (e) {
119-
if (!e.code) throw e;
120-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
121-
}
122-
// node.js v0.10.20 doesn't report blksize and blocks on Windows. Fake them with default blksize of 4096.
125+
NODEFS.tryFSOperation(() => stat = fs.lstatSync(path));
126+
// node.js v0.10.20 doesn't report blksize and blocks on Windows. Fake
127+
// them with default blksize of 4096.
123128
// See http://support.microsoft.com/kb/140365
124129
if (NODEFS.isWindows && !stat.blksize) {
125130
stat.blksize = 4096;
@@ -145,7 +150,7 @@ addToLibrary({
145150
},
146151
setattr(node, attr) {
147152
var path = NODEFS.realPath(node);
148-
try {
153+
NODEFS.tryFSOperation(() => {
149154
if (attr.mode !== undefined) {
150155
fs.chmodSync(path, attr.mode);
151156
// update the common node structure mode as well
@@ -158,10 +163,7 @@ addToLibrary({
158163
if (attr.size !== undefined) {
159164
fs.truncateSync(path, attr.size);
160165
}
161-
} catch (e) {
162-
if (!e.code) throw e;
163-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
164-
}
166+
});
165167
},
166168
lookup(parent, name) {
167169
var path = PATH.join2(NODEFS.realPath(parent), name);
@@ -172,132 +174,84 @@ addToLibrary({
172174
var node = NODEFS.createNode(parent, name, mode, dev);
173175
// create the backing node for this in the fs root as well
174176
var path = NODEFS.realPath(node);
175-
try {
177+
NODEFS.tryFSOperation(() => {
176178
if (FS.isDir(node.mode)) {
177179
fs.mkdirSync(path, node.mode);
178180
} else {
179181
fs.writeFileSync(path, '', { mode: node.mode });
180182
}
181-
} catch (e) {
182-
if (!e.code) throw e;
183-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
184-
}
183+
});
185184
return node;
186185
},
187186
rename(oldNode, newDir, newName) {
188187
var oldPath = NODEFS.realPath(oldNode);
189188
var newPath = PATH.join2(NODEFS.realPath(newDir), newName);
190-
try {
191-
fs.renameSync(oldPath, newPath);
192-
} catch (e) {
193-
if (!e.code) throw e;
194-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
195-
}
189+
NODEFS.tryFSOperation(() => fs.renameSync(oldPath, newPath));
196190
oldNode.name = newName;
197191
},
198192
unlink(parent, name) {
199193
var path = PATH.join2(NODEFS.realPath(parent), name);
200-
try {
201-
fs.unlinkSync(path);
202-
} catch (e) {
203-
if (!e.code) throw e;
204-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
205-
}
194+
NODEFS.tryFSOperation(() => fs.unlinkSync(path));
206195
},
207196
rmdir(parent, name) {
208197
var path = PATH.join2(NODEFS.realPath(parent), name);
209-
try {
210-
fs.rmdirSync(path);
211-
} catch (e) {
212-
if (!e.code) throw e;
213-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
214-
}
198+
NODEFS.tryFSOperation(() => fs.rmdirSync(path));
215199
},
216200
readdir(node) {
217201
var path = NODEFS.realPath(node);
218-
try {
219-
return fs.readdirSync(path);
220-
} catch (e) {
221-
if (!e.code) throw e;
222-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
223-
}
202+
return NODEFS.tryFSOperation(() => fs.readdirSync(path));
224203
},
225204
symlink(parent, newName, oldPath) {
226205
var newPath = PATH.join2(NODEFS.realPath(parent), newName);
227-
try {
228-
fs.symlinkSync(oldPath, newPath);
229-
} catch (e) {
230-
if (!e.code) throw e;
231-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
232-
}
206+
NODEFS.tryFSOperation(() => fs.symlinkSync(oldPath, newPath));
233207
},
234208
readlink(node) {
235209
var path = NODEFS.realPath(node);
236-
try {
237-
return fs.readlinkSync(path);
238-
} catch (e) {
239-
if (!e.code) throw e;
240-
// node under windows can return code 'UNKNOWN' here:
241-
// https://github.com/emscripten-core/emscripten/issues/15468
242-
if (e.code === 'UNKNOWN') throw new FS.ErrnoError({{{ cDefs.EINVAL }}});
243-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
244-
}
210+
return NODEFS.tryFSOperation(() => fs.readlinkSync(path));
245211
},
246212
},
247213
stream_ops: {
248214
open(stream) {
249215
var path = NODEFS.realPath(stream.node);
250-
try {
216+
NODEFS.tryFSOperation(() => {
251217
if (FS.isFile(stream.node.mode)) {
252218
stream.shared.refcount = 1;
253219
stream.nfd = fs.openSync(path, NODEFS.flagsForNode(stream.flags));
254220
}
255-
} catch (e) {
256-
if (!e.code) throw e;
257-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
258-
}
221+
});
259222
},
260223
close(stream) {
261-
try {
224+
NODEFS.tryFSOperation(() => {
262225
if (FS.isFile(stream.node.mode) && stream.nfd && --stream.shared.refcount === 0) {
263226
fs.closeSync(stream.nfd);
264227
}
265-
} catch (e) {
266-
if (!e.code) throw e;
267-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
268-
}
228+
});
269229
},
270230
dup(stream) {
271231
stream.shared.refcount++;
272232
},
273233
read(stream, buffer, offset, length, position) {
274234
// Node.js < 6 compatibility: node errors on 0 length reads
275235
if (length === 0) return 0;
276-
try {
277-
return fs.readSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), 0, length, position);
278-
} catch (e) {
279-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
280-
}
236+
return NODEFS.tryFSOperation(() =>
237+
fs.readSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), 0, length, position)
238+
);
281239
},
282240
write(stream, buffer, offset, length, position) {
283-
try {
284-
return fs.writeSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), 0, length, position);
285-
} catch (e) {
286-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
287-
}
241+
return NODEFS.tryFSOperation(() =>
242+
fs.writeSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), 0, length, position)
243+
);
288244
},
289245
llseek(stream, offset, whence) {
290246
var position = offset;
291247
if (whence === {{{ cDefs.SEEK_CUR }}}) {
292248
position += stream.position;
293249
} else if (whence === {{{ cDefs.SEEK_END }}}) {
294250
if (FS.isFile(stream.node.mode)) {
295-
try {
251+
NODEFS.tryFSOperation(() => {
296252
var stat = fs.fstatSync(stream.nfd);
297253
position += stat.size;
298-
} catch (e) {
299-
throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
300-
}
254+
});
301255
}
302256
}
303257

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