updated methods for working with editable metadata
ansuz
parent
fd43da2dbf
commit
b128b7f02c
241
storage/file.js
241
storage/file.js
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@ -84,12 +84,6 @@ var getMetadataAtPath = function (Env, path, cb) {
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stream.on('error', function (e) { complete(e); });
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};
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// FIXME METADATA
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var getChannelMetadata = function (Env, channelId, cb) {
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var path = mkPath(Env, channelId);
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getMetadataAtPath(Env, path, cb);
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};
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var closeChannel = function (env, channelName, cb) {
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if (!env.channels[channelName]) { return void cb(); }
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try {
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@ -104,7 +98,6 @@ var closeChannel = function (env, channelName, cb) {
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var clearChannel = function (env, channelId, cb) {
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var path = mkPath(env, channelId);
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// FIXME METADATA
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getMetadataAtPath(env, path, function (e, metadata) {
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if (e) { return cb(new Error(e)); }
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if (!metadata) {
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@ -153,6 +146,77 @@ var readMessages = function (path, msgHandler, cb) {
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stream.on('error', function (e) { complete(e); });
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};
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// FIXME METADATA
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// XXX deprecate this everywhere in favour of the new method
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var getChannelMetadata = function (Env, channelId, cb) {
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var path = mkPath(Env, channelId);
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// gets metadata embedded in a file
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getMetadataAtPath(Env, path, cb);
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};
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var readMetadata = function (env, channelId, handler, cb) {
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/*
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Possibilities
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1. there is no metadata because it's an old channel
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2. there is metadata in the first line of the channel, but nowhere else
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3. there is metadata in the first line of the channel as well as in a dedicated log
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4. there is no metadata in the first line of the channel. Everything is in the dedicated log
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How to proceed
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1. load the first line of the channel and treat it as a metadata message if applicable
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2. load the dedicated log and treat it as an update
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*/
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var CB = Once(cb);
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var index = 0;
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nThen(function (w) {
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// returns the first line of a channel, parsed...
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getChannelMetadata(env, channelId, w(function (err, data) {
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if (err) {
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// 'INVALID_METADATA' if it can't parse
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// stream errors if anything goes wrong at a lower level
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// ENOENT (no channel here)
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return void handler(err, undefined, index++);
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}
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// disregard anything that isn't a map
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if (!data || typeof(data) !== 'object' || Array.isArray(data)) { return; }
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// otherwise it's good.
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handler(null, data, index++);
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}));
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}).nThen(function (w) {
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var metadataPath = mkMetadataPath(env, channelId);
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readMessages(metadataPath, function (line) {
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if (!line) { return; }
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try {
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var parsed = JSON.parse(line);
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handler(null, parsed, index++);
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} catch (e) {
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handler(e, line, index++);
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}
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}, w(function (err) {
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if (err) {
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// ENOENT => there is no metadata log
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if (err.code === 'ENOENT') { return void CB(); }
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// otherwise stream errors?
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CB(err);
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}
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CB();
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}));
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});
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};
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var writeMetadata = function (env, channelId, data, cb) {
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cb = cb;
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// XXX
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};
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const NEWLINE_CHR = ('\n').charCodeAt(0);
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const mkBufferSplit = () => {
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let remainder = null;
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@ -232,20 +296,62 @@ var checkPath = function (path, callback) {
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});
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};
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// FIXME METADATA
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// remove associated metadata as well
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var removeChannel = function (env, channelName, cb) {
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var filename = mkPath(env, channelName);
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Fs.unlink(filename, cb);
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var labelError = function (label, err) {
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return label + (err.code ? "_" + err.code: '');
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};
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// FIXME
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// remove associated metadata as well
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var removeArchivedChannel = function (env, channelName, cb) {
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var filename = mkArchivePath(env, channelName);
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Fs.unlink(filename, cb);
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var removeChannel = function (env, channelName, cb) {
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var channelPath = mkPath(env, channelName);
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var metadataPath = mkMetadataPath(env, channelName);
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var CB = Once(cb);
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nThen(function (w) {
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Fs.unlink(channelPath, w(function (err) {
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if (err) {
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w.abort();
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CB(labelError("E_CHANNEL_REMOVAL", err));
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}
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}));
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Fs.unlink(metadataPath, w(function (err) {
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if (err) {
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if (err.code === 'ENOENT') { return; } // proceed if there's no metadata to delete
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w.abort();
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CB(labelError("E_METADATA_REMOVAL", err));
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}
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}));
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}).nThen(function () {
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CB();
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});
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};
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var removeArchivedChannel = function (env, channelName, cb) {
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var channelPath = mkArchivePath(env, channelName);
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var metadataPath = mkArchiveMetadataPath(env, channelName);
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var CB = Once(cb);
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nThen(function (w) {
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Fs.unlink(channelPath, w(function (err) {
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if (err) {
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w.abort();
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CB(labelError("E_ARCHIVED_CHANNEL_REMOVAL", err));
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}
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}));
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Fs.unlink(metadataPath, w(function (err) {
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if (err) {
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if (err.code === "ENOENT") { return; }
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w.abort();
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CB(labelError("E_ARCHIVED_METADATA_REMOVAL", err));
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}
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}));
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}).nThen(function () {
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CB();
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});
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};
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// TODO implement a method of removing metadata that doesn't have a corresponding channel
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// TODO confirm that we're ignoring metadata files
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var listChannels = function (root, handler, cb) {
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// do twenty things at a time
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@ -352,7 +458,7 @@ var archiveChannel = function (env, channelName, cb) {
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// there was an error archiving the metadata
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if (err) {
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return void cb("E_METADATA_ARCHIVAL" + (err.code ? "_" + err.code: ''));
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return void cb(labelError("E_METADATA_ARCHIVAL", err));
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}
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// it was archived successfully
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@ -420,7 +526,7 @@ var unarchiveChannel = function (env, channelName, cb) {
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// call back with an error if something goes wrong
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if (err) {
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w.abort();
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return void CB("E_METADATA_RESTORATION" + (err.code ? "_" + err.code: ""));
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return void CB(labelError("E_METADATA_RESTORATION", err));
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}
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// otherwise it was moved successfully
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CB();
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@ -458,7 +564,6 @@ var channelBytes = function (env, chanName, cb) {
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});
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};
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// FIXME METADATA
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// implement metadata bytes as well?
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/*::
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export type ChainPadServer_ChannelInternal_t = {
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@ -662,80 +767,118 @@ module.exports.create = function (
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}));
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}).nThen(function () {
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cb({
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readMessagesBin: (channelName, start, asyncMsgHandler, cb) => {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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readMessagesBin(env, channelName, start, asyncMsgHandler, cb);
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},
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// OLDER METHODS
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// write a new message to a log
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message: function (channelName, content, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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message(env, channelName, content, cb);
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},
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messageBin: (channelName, content, cb) => {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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messageBin(env, channelName, content, cb);
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},
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// iterate over all the messages in a log
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getMessages: function (channelName, msgHandler, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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getMessages(env, channelName, msgHandler, cb);
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},
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// NEWER IMPLEMENTATIONS OF THE SAME THING
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// write a new message to a log
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messageBin: (channelName, content, cb) => {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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messageBin(env, channelName, content, cb);
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},
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// iterate over the messages in a log
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readMessagesBin: (channelName, start, asyncMsgHandler, cb) => {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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readMessagesBin(env, channelName, start, asyncMsgHandler, cb);
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},
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// METHODS for deleting data
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// remove a channel and its associated metadata log if present
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removeChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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removeChannel(env, channelName, function (err) {
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cb(err);
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});
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},
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// remove a channel and its associated metadata log from the archive directory
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removeArchivedChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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removeArchivedChannel(env, channelName, cb);
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},
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closeChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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closeChannel(env, channelName, cb);
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},
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flushUnusedChannels: function (cb) {
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flushUnusedChannels(env, cb);
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},
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getChannelSize: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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channelBytes(env, channelName, cb);
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},
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getChannelMetadata: function (channelName, cb) { // FIXME METADATA
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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getChannelMetadata(env, channelName, cb);
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},
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// clear all data for a channel but preserve its metadata
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clearChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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clearChannel(env, channelName, cb);
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},
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listChannels: function (handler, cb) {
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listChannels(env.root, handler, cb);
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},
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// check if a channel exists in the database
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isChannelAvailable: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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// construct the path
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var filepath = mkPath(env, channelName);
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channelExists(filepath, cb);
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},
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// check if a channel exists in the archive
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isChannelArchived: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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// construct the path
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var filepath = mkArchivePath(env, channelName);
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channelExists(filepath, cb);
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},
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listArchivedChannels: function (handler, cb) {
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listChannels(Path.join(env.archiveRoot, 'datastore'), handler, cb);
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},
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// move a channel from the database to the archive, along with its metadata
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archiveChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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archiveChannel(env, channelName, cb);
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},
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// restore a channel from the archive to the database, along with its metadata
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restoreArchivedChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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unarchiveChannel(env, channelName, cb);
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},
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// METADATA METHODS
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// fetch the metadata for a channel
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getChannelMetadata: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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getChannelMetadata(env, channelName, cb);
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},
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// iterate over multiple lines of metadata changes
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readChannelMetadata: function (channelName, handler, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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readMetadata(env, channelName, handler, cb);
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},
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// write a new line to a metadata log
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writeMetadata: function (channelName, data, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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writeMetadata(env, channelName, data, cb);
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},
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// CHANNEL ITERATION
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listChannels: function (handler, cb) {
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listChannels(env.root, handler, cb);
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},
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listArchivedChannels: function (handler, cb) {
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listChannels(Path.join(env.archiveRoot, 'datastore'), handler, cb);
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},
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getChannelSize: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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channelBytes(env, channelName, cb);
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},
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// OTHER DATABASE FUNCTIONALITY
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// remove a particular channel from the cache
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closeChannel: function (channelName, cb) {
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if (!isValidChannelId(channelName)) { return void cb(new Error('EINVAL')); }
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closeChannel(env, channelName, cb);
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},
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// iterate over open channels and close any that are not active
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flushUnusedChannels: function (cb) {
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flushUnusedChannels(env, cb);
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},
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// write to a log file
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log: function (channelName, content, cb) {
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message(env, channelName, content, cb);
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},
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// shut down the database
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shutdown: function () {
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clearInterval(it);
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}
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