implement blob management methods in a dedicated file
ansuz
5 years ago
parent
d4b4a50253
commit
c7f70d7264
@ -0,0 +1,413 @@
|
||||
/* globals Buffer */
|
||||
var Fs = require("fs");
|
||||
var Fse = require("fs-extra");
|
||||
var Path = require("path");
|
||||
|
||||
var BlobStore = module.exports;
|
||||
var nThen = require("nthen");
|
||||
var Util = require("../lib/common-util");
|
||||
|
||||
var isValidSafeKey = function (safeKey) {
|
||||
return typeof(safeKey) === 'string' && !/\//.test(safeKey) && safeKey.length === 44;
|
||||
};
|
||||
|
||||
var isValidId = function (id) {
|
||||
return typeof(id) === 'string' && id.length === 48 && !/[^a-f0-9]/.test(id);
|
||||
};
|
||||
|
||||
// helpers
|
||||
|
||||
// /blob/<safeKeyPrefix>/<safeKey>/<blobPrefix>
|
||||
var makePathToBlob = function (Env, blobId) {
|
||||
return Path.join(Env.blobPath, blobId.slice(0, 2));
|
||||
};
|
||||
|
||||
// /blob/<safeKeyPrefix>/<safeKey>/<blobPrefix>/<blobId>
|
||||
var makeBlobPath = function (Env, blobId) {
|
||||
return Path.join(makePathToBlob(Env, blobId), blobId);
|
||||
};
|
||||
|
||||
// /blobstate/<safeKeyPrefix>
|
||||
var makePathToStage = function (Env, safeKey) {
|
||||
return Path.join(Env.blobStagingPath, safeKey.slice(0, 2));
|
||||
};
|
||||
|
||||
// /blobstate/<safeKeyPrefix>/<safeKey>
|
||||
var makeStagePath = function (Env, safeKey) {
|
||||
return Path.join(makePathToStage(Env, safeKey), safeKey);
|
||||
};
|
||||
|
||||
// /blob/<safeKeyPrefix>/<safeKey>/<blobPrefix>
|
||||
var makePathToProof = function (Env, safeKey, blobId) {
|
||||
return Path.join(Env.blobPath, safeKey.slice(0, 3), safeKey, blobId.slice(0, 2), blobId);
|
||||
};
|
||||
|
||||
// /blob/<safeKeyPrefix>/<safeKey>/<blobPrefix>/<blobId>
|
||||
var makeProofPath = function (Env, safeKey, blobId) {
|
||||
return Path.join(makePathToProof(Env, safeKey, blobId), blobId);
|
||||
};
|
||||
|
||||
// getUploadSize: used by
|
||||
// getFileSize
|
||||
var getUploadSize = function (Env, blobId, cb) {
|
||||
var path = makeBlobPath(Env, blobId);
|
||||
if (!path) { return cb('INVALID_UPLOAD_ID'); }
|
||||
Fs.stat(path, function (err, stats) {
|
||||
if (err) {
|
||||
// if a file was deleted, its size is 0 bytes
|
||||
if (err.code === 'ENOENT') { return cb(void 0, 0); }
|
||||
return void cb(err.code);
|
||||
}
|
||||
cb(void 0, stats.size);
|
||||
});
|
||||
};
|
||||
|
||||
// isFile: used by
|
||||
// removeOwnedBlob
|
||||
// uploadComplete
|
||||
// uploadStatus
|
||||
var isFile = function (filePath, cb) {
|
||||
Fs.stat(filePath, function (e, stats) {
|
||||
if (e) {
|
||||
if (e.code === 'ENOENT') { return void cb(void 0, false); }
|
||||
return void cb(e.message);
|
||||
}
|
||||
return void cb(void 0, stats.isFile());
|
||||
});
|
||||
};
|
||||
|
||||
var makeFileStream = function (dir, full, cb) {
|
||||
Fse.mkdirp(dir, function (e) {
|
||||
if (e || !full) { // !full for pleasing flow, it's already checked
|
||||
//WARN('makeFileStream', e);
|
||||
return void cb(e ? e.message : 'INTERNAL_ERROR');
|
||||
}
|
||||
|
||||
try {
|
||||
var stream = Fs.createWriteStream(full, {
|
||||
flags: 'a',
|
||||
encoding: 'binary',
|
||||
highWaterMark: Math.pow(2, 16),
|
||||
});
|
||||
stream.on('open', function () {
|
||||
cb(void 0, stream);
|
||||
});
|
||||
stream.on('error', function (/* e */) {
|
||||
//console.error("MAKE_FILE_STREAM", full);
|
||||
// XXX ERROR
|
||||
//WARN('stream error', e);
|
||||
});
|
||||
} catch (err) {
|
||||
cb('BAD_STREAM');
|
||||
}
|
||||
});
|
||||
};
|
||||
|
||||
/********** METHODS **************/
|
||||
|
||||
var upload = function (Env, safeKey, content, cb) {
|
||||
var dec;
|
||||
|
||||
try { dec = Buffer.from(content, 'base64'); }
|
||||
catch (e) { return void cb('DECODE_BUFFER'); }
|
||||
var len = dec.length;
|
||||
|
||||
var session = Env.getSession(safeKey);
|
||||
|
||||
if (typeof(session.currentUploadSize) !== 'number' ||
|
||||
typeof(session.pendingUploadSize) !== 'number') {
|
||||
// improperly initialized... maybe they didn't check before uploading?
|
||||
// reject it, just in case
|
||||
return cb('NOT_READY');
|
||||
}
|
||||
|
||||
if (session.currentUploadSize > session.pendingUploadSize) {
|
||||
return cb('E_OVER_LIMIT');
|
||||
}
|
||||
|
||||
if (!session.blobstage) {
|
||||
makeFileStream(makePathToStage(Env, safeKey), makeStagePath(Env, safeKey), function (e, stream) {
|
||||
if (!stream) { return void cb(e); }
|
||||
|
||||
var blobstage = session.blobstage = stream;
|
||||
blobstage.write(dec);
|
||||
session.currentUploadSize += len;
|
||||
cb(void 0, dec.length);
|
||||
});
|
||||
} else {
|
||||
session.blobstage.write(dec);
|
||||
session.currentUploadSize += len;
|
||||
cb(void 0, dec.length);
|
||||
}
|
||||
};
|
||||
|
||||
// upload_cancel
|
||||
var upload_cancel = function (Env, safeKey, fileSize, cb) {
|
||||
var session = Env.getSession(safeKey);
|
||||
session.pendingUploadSize = fileSize;
|
||||
session.currentUploadSize = 0;
|
||||
if (session.blobstage) { session.blobstage.close(); }
|
||||
|
||||
var path = makeStagePath(Env, safeKey);
|
||||
|
||||
Fs.unlink(path, function (e) {
|
||||
if (e) { return void cb('E_UNLINK'); }
|
||||
cb(void 0);
|
||||
});
|
||||
};
|
||||
|
||||
// upload_complete
|
||||
var upload_complete = function (Env, safeKey, id, cb) {
|
||||
var session = Env.getSession(safeKey);
|
||||
|
||||
if (session.blobstage && session.blobstage.close) {
|
||||
session.blobstage.close();
|
||||
delete session.blobstage;
|
||||
}
|
||||
|
||||
var oldPath = makeStagePath(Env, safeKey);
|
||||
var newPath = makeBlobPath(Env, id);
|
||||
|
||||
nThen(function (w) {
|
||||
// make sure the path to your final location exists
|
||||
Fse.mkdirp(makePathToBlob(Env, id), function (e) {
|
||||
if (e) {
|
||||
w.abort();
|
||||
return void cb('RENAME_ERR');
|
||||
}
|
||||
});
|
||||
}).nThen(function (w) {
|
||||
// make sure there's not already something in that exact location
|
||||
isFile(newPath, function (e, yes) {
|
||||
if (e) {
|
||||
w.abort();
|
||||
return void cb(e);
|
||||
}
|
||||
if (yes) {
|
||||
w.abort();
|
||||
return void cb('RENAME_ERR');
|
||||
}
|
||||
cb(void 0, newPath, id);
|
||||
});
|
||||
}).nThen(function () {
|
||||
// finally, move the old file to the new path
|
||||
// FIXME we could just move and handle the EEXISTS instead of the above block
|
||||
Fse.move(oldPath, newPath, function (e) {
|
||||
if (e) { return void cb('RENAME_ERR'); }
|
||||
cb(void 0, id);
|
||||
});
|
||||
});
|
||||
};
|
||||
|
||||
var tryId = function (path, cb) {
|
||||
Fs.access(path, Fs.constants.R_OK | Fs.constants.W_OK, function (e) {
|
||||
if (!e) {
|
||||
// generate a new id (with the same prefix) and recurse
|
||||
//WARN('ownedUploadComplete', 'id is already used '+ id);
|
||||
return void cb('EEXISTS');
|
||||
} else if (e.code === 'ENOENT') {
|
||||
// no entry, so it's safe for us to proceed
|
||||
return void cb();
|
||||
} else {
|
||||
// it failed in an unexpected way. log it
|
||||
//WARN('ownedUploadComplete', e);
|
||||
return void cb(e.code);
|
||||
}
|
||||
});
|
||||
};
|
||||
|
||||
// owned_upload_complete
|
||||
var owned_upload_complete = function (Env, safeKey, id, cb) {
|
||||
var session = Env.getSession(safeKey);
|
||||
|
||||
// the file has already been uploaded to the staging area
|
||||
// close the pending writestream
|
||||
if (session.blobstage && session.blobstage.close) {
|
||||
session.blobstage.close();
|
||||
delete session.blobstage;
|
||||
}
|
||||
|
||||
if (!isValidId(id)) {
|
||||
//WARN('ownedUploadComplete', "id is invalid");
|
||||
return void cb('EINVAL_ID');
|
||||
}
|
||||
|
||||
var oldPath = makeStagePath(Env, safeKey);
|
||||
if (typeof(oldPath) !== 'string') {
|
||||
return void cb('EINVAL_CONFIG');
|
||||
}
|
||||
|
||||
var ownPath = makePathToProof(Env, safeKey, id);
|
||||
var filePath = makePathToBlob(Env, id);
|
||||
|
||||
var finalPath = makeBlobPath(Env, id);
|
||||
var finalOwnPath = makeProofPath(Env, safeKey, id);
|
||||
|
||||
// the user wants to move it into blob and create a empty file with the same id
|
||||
// in their own space:
|
||||
// /blob/safeKeyPrefix/safeKey/blobPrefix/blobID
|
||||
|
||||
nThen(function (w) {
|
||||
// make the requisite directory structure using Mkdirp
|
||||
Fse.mkdirp(filePath, w(function (e /*, path */) {
|
||||
if (e) { // does not throw error if the directory already existed
|
||||
w.abort();
|
||||
return void cb(e.code);
|
||||
}
|
||||
}));
|
||||
Fse.mkdirp(ownPath, w(function (e /*, path */) {
|
||||
if (e) { // does not throw error if the directory already existed
|
||||
w.abort();
|
||||
return void cb(e.code);
|
||||
}
|
||||
}));
|
||||
}).nThen(function (w) {
|
||||
// make sure the id does not collide with another
|
||||
tryId(finalPath, w(function (e) {
|
||||
if (e) {
|
||||
w.abort();
|
||||
return void cb(e);
|
||||
}
|
||||
}));
|
||||
}).nThen(function (w) {
|
||||
// Create the empty file proving ownership
|
||||
Fs.writeFile(finalOwnPath, '', w(function (e) {
|
||||
if (e) {
|
||||
w.abort();
|
||||
return void cb(e.code);
|
||||
}
|
||||
// otherwise it worked...
|
||||
}));
|
||||
}).nThen(function (w) {
|
||||
// move the existing file to its new path
|
||||
Fse.move(oldPath, finalPath, w(function (e) {
|
||||
if (e) {
|
||||
// if there's an error putting the file into its final location...
|
||||
// ... you should remove the ownership file
|
||||
Fs.unlink(finalOwnPath, function () {
|
||||
// but if you can't, it's not catestrophic
|
||||
// we can clean it up later
|
||||
});
|
||||
w.abort();
|
||||
return void cb(e.code);
|
||||
}
|
||||
// otherwise it worked...
|
||||
}));
|
||||
}).nThen(function () {
|
||||
// clean up their session when you're done
|
||||
// call back with the blob id...
|
||||
cb(void 0, id);
|
||||
});
|
||||
};
|
||||
|
||||
// removeBlob
|
||||
var remove = function (Env, blobId, cb) {
|
||||
var blobPath = makeBlobPath(Env, blobId);
|
||||
Fs.unlink(blobPath, cb); // TODO COLDSTORAGE
|
||||
};
|
||||
|
||||
// removeProof
|
||||
var removeProof = function (Env, safeKey, blobId, cb) {
|
||||
var proofPath = makeProofPath(Env, safeKey, blobId);
|
||||
Fs.unlink(proofPath, cb);
|
||||
};
|
||||
|
||||
// isOwnedBy(id, safeKey)
|
||||
var isOwnedBy = function (Env, safeKey, blobId, cb) {
|
||||
var proofPath = makeProofPath(Env, safeKey, blobId);
|
||||
isFile(proofPath, cb);
|
||||
};
|
||||
|
||||
var listFiles = function (Env, handler, cb) {
|
||||
cb("NOT_IMPLEMENTED");
|
||||
};
|
||||
|
||||
BlobStore.create = function (config, _cb) {
|
||||
var cb = Util.once(Util.mkAsync(_cb));
|
||||
if (typeof(config.getSession) !== 'function') {
|
||||
return void cb("getSession method required");
|
||||
}
|
||||
|
||||
var Env = {
|
||||
blobPath: config.blobPath || './blob',
|
||||
blobStagingPath: config.blobStagingPath || './blobstage',
|
||||
getSession: config.getSession,
|
||||
};
|
||||
|
||||
nThen(function (w) {
|
||||
var CB = Util.both(w.abort, cb);
|
||||
Fse.mkdirp(Env.blobPath, w(function (e) {
|
||||
if (e) { CB(e); }
|
||||
}));
|
||||
Fse.mkdirp(Env.blobStagingPath, w(function (e) {
|
||||
if (e) { CB(e); }
|
||||
}));
|
||||
}).nThen(function () {
|
||||
cb(void 0, {
|
||||
isFileId: isValidId,
|
||||
status: function (safeKey, _cb) {
|
||||
// TODO check if the final destination is a file
|
||||
// because otherwise two people can try to upload to the same location
|
||||
// and one will fail, invalidating their hard work
|
||||
var cb = Util.once(Util.mkAsync(_cb));
|
||||
if (!isValidSafeKey(safeKey)) { return void cb('INVALID_SAFEKEY'); }
|
||||
isFile(makeStagePath(Env, safeKey), cb);
|
||||
},
|
||||
upload: function (safeKey, content, _cb) {
|
||||
var cb = Util.once(Util.mkAsync(_cb));
|
||||
if (!isValidSafeKey(safeKey)) { return void cb('INVALID_SAFEKEY'); }
|
||||
upload(Env, safeKey, content, Util.once(Util.mkAsync(cb)));
|
||||
},
|
||||
|
||||
cancel: function (safeKey, fileSize, _cb) {
|
||||
var cb = Util.once(Util.mkAsync(_cb));
|
||||
if (!isValidSafeKey(safeKey)) { return void cb('INVALID_SAFEKEY'); }
|
||||
if (typeof(fileSize) !== 'number' || isNaN(fileSize) || fileSize <= 0) { return void cb("INVALID_FILESIZE"); }
|
||||
upload_cancel(Env, safeKey, fileSize, cb);
|
||||
},
|
||||
|
||||
isOwnedBy: function (safeKey, blobId, _cb) {
|
||||
var cb = Util.once(Util.mkAsync(_cb));
|
||||
if (!isValidSafeKey(safeKey)) { return void cb('INVALID_SAFEKEY'); }
|
||||
isOwnedBy(Env, safeKey, blobId, cb);
|
||||
},
|
||||
|
||||
remove: function (blobId, _cb) {
|
||||
var cb = Util.once(Util.mkAsync(_cb));
|
||||
if (!isValidId(blobId)) { return void cb("INVALID_ID"); }
|
||||
remove(Env, blobId, cb);
|
||||
},
|
||||
|
||||
removeProof: function (safeKey, blobId, _cb) {
|
||||
var cb = Util.once(Util.mkAsync(_cb));
|
||||
if (!isValidSafeKey(safeKey)) { return void cb('INVALID_SAFEKEY'); }
|
||||
if (!isValidId(blobId)) { return void cb("INVALID_ID"); }
|
||||
removeProof(Env, safeKey, blobId, cb);
|
||||
},
|
||||
|
||||
complete: function (safeKey, id, _cb) {
|
||||
var cb = Util.once(Util.mkAsync(_cb));
|
||||
if (!isValidSafeKey(safeKey)) { return void cb('INVALID_SAFEKEY'); }
|
||||
if (!isValidId(id)) { return void cb("INVALID_ID"); }
|
||||
upload_complete(Env, safeKey, id, cb);
|
||||
},
|
||||
completeOwned: function (safeKey, id, _cb) {
|
||||
var cb = Util.once(Util.mkAsync(_cb));
|
||||
if (!isValidSafeKey(safeKey)) { return void cb('INVALID_SAFEKEY'); }
|
||||
if (!isValidId(id)) { return void cb("INVALID_ID"); }
|
||||
owned_upload_complete(Env, safeKey, id, cb);
|
||||
},
|
||||
size: function (id, _cb) {
|
||||
var cb = Util.once(Util.mkAsync(_cb));
|
||||
if (!isValidId(id)) { return void cb("INVALID_ID"); }
|
||||
getUploadSize(Env, id, cb);
|
||||
},
|
||||
|
||||
list: function (handler, _cb) {
|
||||
var cb = Util.once(Util.mkAsync(_cb));
|
||||
listFiles(Env, handler, cb);
|
||||
},
|
||||
});
|
||||
});
|
||||
};
|
||||
|
||||
Loading…
Reference in New Issue