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verdaccio/lib/storage.js
2013-10-22 11:00:04 +04:00

392 lines
9.8 KiB
JavaScript

var async = require('async');
var semver = require('semver');
var UError = require('./error').UserError;
var Local = require('./local-storage');
var Proxy = require('./up-storage');
var mystreams = require('./streams');
var utils = require('./utils');
//
// Implements Storage interface
// (same for storage.js, local-storage.js, up-storage.js)
//
function Storage(config) {
if (!(this instanceof Storage)) return new Storage(config);
this.config = config;
// we support a number of uplinks, but only one local storage
// Proxy and Local classes should have similar API interfaces
this.uplinks = {};
for (var p in config.uplinks) {
this.uplinks[p] = new Proxy(config.uplinks[p], config);
}
this.local = new Local(config);
return this;
}
//
// Add a {name} package to a system
//
// Function checks if package with the same name is available from uplinks.
// If it isn't, we create package metadata locally and send requests to do
// the same to all uplinks with write access. If all actions succeeded, we
// report success, if just one uplink fails, we abort.
//
// TODO: if a package is uploaded to uplink1, but upload to uplink2 fails,
// we report failure, but package is not removed from uplink1. This might
// require manual intervention.
//
// Used storages: local (write) && uplinks (proxy_access, r/o) &&
// uplinks (proxy_publish, write)
//
Storage.prototype.add_package = function(name, metadata, callback) {
var self = this;
var uplinks = [];
for (var i in self.uplinks) {
if (self.config.proxy_access(name, i)) {
uplinks.push(self.uplinks[i]);
}
}
async.map(uplinks, function(up, cb) {
up.get_package(name, function(err, res) {
cb(null, [err, res]);
});
}, function(err, results) {
for (var i=0; i<results.length; i++) {
// checking error
// if uplink fails with a status other than 404, we report failure
if (results[i][0] != null) {
if (results[i][0].status !== 404) {
return callback(new UError({
status: 503,
msg: 'one of the uplinks is down, refuse to publish'
}));
}
}
// checking package
if (results[i][1] != null) {
return callback(new UError({
status: 409,
msg: 'this package is already present'
}));
}
}
uplinks = [];
for (var i in self.uplinks) {
if (self.config.proxy_publish(name, i)) {
uplinks.push(self.uplinks[i]);
}
}
async.map(uplinks, function(up, cb) {
up.add_package(name, metadata, cb);
}, function(err, results) {
if (err) {
return callback(new UError({
status: 503,
msg: 'can\'t upload to one of the uplinks, refuse to publish'
}));
}
self.local.add_package(name, metadata, callback);
});
});
}
//
// Add a new version of package {name} to a system
//
// Function uploads a new package version to all uplinks with write access
// and if everything succeeded it adds it locally.
//
// TODO: if a package is uploaded to uplink1, but upload to uplink2 fails,
// we report failure, but package is not removed from uplink1. This might
// require manual intervention.
//
// Used storages: local (write) && uplinks (proxy_publish, write)
//
Storage.prototype.add_version = function(name, version, metadata, tag, callback) {
var self = this;
var uplinks = [];
for (var i in self.uplinks) {
if (self.config.proxy_publish(name, i)) {
uplinks.push(self.uplinks[i]);
}
}
async.map(uplinks, function(up, cb) {
up.add_version(name, version, metadata, tag, cb);
}, function(err, results) {
if (err) {
return callback(new UError({
status: 503,
msg: 'can\'t upload to one of the uplinks, refuse to publish'
}));
}
self.local.add_version(name, version, metadata, tag, callback);
});
}
//
// Remove a package from a system
//
// Function removes a package from local storage and all uplinks with
// write access.
//
// TODO: currently it works only locally
//
// TODO: if a package is uploaded to uplink1, but upload to uplink2 fails,
// we report failure, but package is not removed from uplink1. This might
// require manual intervention.
//
// Used storages: local (write) && uplinks (proxy_publish, write)
//
Storage.prototype.remove_package = function(name, callback) {
return this.local.remove_package(name, callback);
}
//
// Upload a tarball for {name} package
//
// Function is syncronous and returns a WritableStream
//
// Function uploads a tarball to all uplinks with write access and to
// local storage in parallel with a speed of a slowest pipe. It reports
// success if all uploads succeed.
//
// Used storages: local (write) && uplinks (proxy_publish, write)
//
Storage.prototype.add_tarball = function(name, filename) {
var stream = new mystreams.UploadTarballStream();
var self = this;
var upstreams = [];
var localstream = self.local.add_tarball(name, filename);
upstreams.push(localstream);
for (var i in self.uplinks) {
if (self.config.proxy_publish(name, i)) {
upstreams.push(self.uplinks[i].add_tarball(name, filename));
}
}
function bail(err) {
upstreams.forEach(function(upstream) {
upstream.abort();
});
}
upstreams.forEach(function(upstream) {
stream.pipe(upstream);
upstream.on('error', function(err) {
if (err.code === 'EEXISTS') {
stream.emit('error', new UError({
status: 409,
msg: 'this tarball is already present'
}));
} else if (!stream.status && upstream !== localstream) {
stream.emit('error', new UError({
status: 503,
msg: 'one or more uplinks are unreachable'
}));
} else {
stream.emit('error', err);
}
bail(err);
});
upstream.on('success', function() {
upstream._sinopia_success = true;
if (upstreams.filter(function(upstream) {
return !upstream._sinopia_success;
}).length === 0) {
stream.emit('success');
}
});
});
stream.abort = function() {
bail();
};
stream.done = function() {
upstreams.forEach(function(upstream) {
upstream.done();
});
};
return stream;
}
//
// Get a tarball from a storage for {name} package
//
// Function is syncronous and returns a ReadableStream
//
// Function tries to read tarball locally, if it fails then it reads package
// information in order to figure out where we can get this tarball from
//
// Used storages: local || uplink (just one)
//
Storage.prototype.get_tarball = function(name, filename) {
var stream = new mystreams.ReadTarballStream();
stream.abort = function() {};
var self = this;
// if someone requesting tarball, it means that we should already have some
// information about it, so fetching package info is unnecessary
// trying local first
var rstream = self.local.get_tarball(name, filename);
var is_open = false;
rstream.on('error', function(err) {
if (is_open || err.status !== 404) {
return stream.emit('error', err);
}
// local reported 404
var err404 = err;
var uplink = null;
rstream.abort();
rstream = null; // gc
self.local.get_package(name, function(err, info) {
if (err) return stream.emit('error', err);
if (info._distfiles[filename] == null) {
return stream.emit('error', err404);
}
var file = info._distfiles[filename];
var uplink = null;
for (var p in self.uplinks) {
if (self.uplinks[p].can_fetch_url(file.url)) {
uplink = self.uplinks[p];
}
}
if (uplink == null) {
uplink = new Proxy({
url: file.url,
_autogenerated: true,
}, self.config);
}
var savestream = self.local.add_tarball(name, filename);
savestream.on('error', function(err) {
savestream.abort();
stream.emit('error', err);
});
savestream.on('open', function() {
var rstream2 = uplink.get_url(file.url);
rstream2.on('error', function(err) {
savestream.abort();
stream.emit('error', err);
});
rstream2.on('end', function() {
savestream.done();
});
// XXX: check, what would happen if client disconnects?
rstream2.pipe(stream);
rstream2.pipe(savestream);
});
});
});
rstream.on('open', function() {
is_open = true;
rstream.pipe(stream);
});
return stream;
}
//
// Retrieve a package metadata for {name} package
//
// Function invokes local.get_package and uplink.get_package for every
// uplink with proxy_access rights against {name} and combines results
// into one json object
//
// Used storages: local && uplink (proxy_access)
//
Storage.prototype.get_package = function(name, callback) {
var self = this;
var uplinks = [this.local];
for (var i in this.uplinks) {
if (this.config.proxy_access(name, i)) {
uplinks.push(this.uplinks[i]);
}
}
var result = {
name: name,
versions: {},
'dist-tags': {},
};
var exists = false;
var latest;
async.map(uplinks, function(up, cb) {
up.get_package(name, function(err, up_res) {
if (err) {
if (up === self.local && (!err.status || err.status >= 500)) {
// report internal errors right away
return cb(err)
} else {
return cb()
}
}
if (up === self.local) {
// file exists in local repo
exists = true
result._rev = up_res._rev
}
try {
utils.validate_metadata(up_res, name);
} catch(err) {
return cb();
}
var this_version = up_res['dist-tags'].latest;
if (latest == null
|| (!semver.gt(latest, this_version) && this_version)) {
latest = this_version;
var is_latest = true;
}
['versions', 'dist-tags'].forEach(function(key) {
for (var i in up_res[key]) {
if (!result[key][i] || is_latest) {
result[key][i] = up_res[key][i];
}
}
});
// if we got to this point, assume that the correct package exists
// on the uplink
exists = true;
cb();
});
}, function(err) {
if (err) return callback(err);
if (!exists) {
return callback(new UError({
status: 404,
msg: 'no such package available'
}));
}
self.local.update_versions(name, result, function(err) {
if (err) return callback(err);
callback(null, result);
});
});
}
module.exports = Storage;