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improve readability with 'readMore' to describe what the callback does

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This commit is contained in:
ansuz 2019-08-13 10:29:49 +02:00
parent ce847700c4
commit 1fb2a0976c
1 changed files with 22 additions and 15 deletions
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37
historyKeeper.js
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@ -119,25 +119,25 @@ module.exports.create = function (cfg) {
// old channels can contain metadata as the first message of the log
// remember metadata the first time you encounter it
// otherwise index important messages in the log
store.readMessagesBin(channelName, 0, (msgObj, rmcb) => {
store.readMessagesBin(channelName, 0, (msgObj, readMore) => {
let msg;
// keep an eye out for the metadata line if you haven't already seen it
// but only check for metadata on the first line
if (!i && !metadata && msgObj.buff.indexOf('{') === 0) {
i++; // always increment the message counter
msg = tryParse(msgObj.buff.toString('utf8'));
if (typeof msg === "undefined") { return rmcb(); }
if (typeof msg === "undefined") { return readMore(); }
// validate that the current line really is metadata before storing it as such
if (msg && typeof(msg) === 'object' && !Array.isArray(msg)) {
metadata = msg;
return rmcb();
return readMore();
}
}
i++;
if (msgObj.buff.indexOf('cp|') > -1) {
msg = msg || tryParse(msgObj.buff.toString('utf8'));
if (typeof msg === "undefined") { return rmcb(); }
if (typeof msg === "undefined") { return readMore(); }
// cache the offsets of checkpoints if they can be parsed
if (msg[2] === 'MSG' && msg[4].indexOf('cp|') === 0) {
cpIndex.push({
@ -152,7 +152,7 @@ module.exports.create = function (cfg) {
// if it's not metadata or a checkpoint then it should be a regular message
// store it in the buffer
messageBuf.push(msgObj);
return rmcb();
return readMore();
}, w((err) => {
if (err && err.code !== 'ENOENT') {
w.abort();
@ -424,13 +424,13 @@ module.exports.create = function (cfg) {
if (offset !== -1) { return; }
// otherwise we have a non-negative offset and we can start to read from there
store.readMessagesBin(channelName, 0, (msgObj, rmcb, abort) => {
store.readMessagesBin(channelName, 0, (msgObj, readMore, abort) => {
// tryParse return a parsed message or undefined
const msg = tryParse(msgObj.buff.toString('utf8'));
// if it was undefined then go onto the next message
if (typeof msg === "undefined") { return rmcb(); }
if (typeof msg === "undefined") { return readMore(); }
if (typeof(msg[4]) !== 'string' || lastKnownHash !== getHash(msg[4])) {
return void rmcb();
return void readMore();
}
offset = msgObj.offset;
abort();
@ -461,9 +461,9 @@ module.exports.create = function (cfg) {
}).nThen((waitFor) => {
if (offset === -1) { return void cb(new Error("could not find offset")); }
const start = (beforeHash) ? 0 : offset;
store.readMessagesBin(channelName, start, (msgObj, rmcb, abort) => {
store.readMessagesBin(channelName, start, (msgObj, readMore, abort) => {
if (beforeHash && msgObj.offset >= offset) { return void abort(); }
handler(tryParse(msgObj.buff.toString('utf8')), rmcb);
handler(tryParse(msgObj.buff.toString('utf8')), readMore);
}, waitFor(function (err) {
return void cb(err);
}));
@ -674,7 +674,13 @@ module.exports.create = function (cfg) {
}).nThen(() => {
let msgCount = 0;
let expired = false;
getHistoryAsync(ctx, channelName, lastKnownHash, false, (msg, cb) => {
// XXX a lot of this logic is currently wrong
// we should have already sent the most up to data metadata (if it exists)
// we should have also already checked if the channel has expired
// we just need to avoid sending metadata a second time
// TODO compute lastKnownHash in a manner such that it will always skip past the metadata line?
getHistoryAsync(ctx, channelName, lastKnownHash, false, (msg, readMore) => {
if (!msg) { return; }
if (msg.validateKey) {
// If it is a young channel, this is the part where we get the metadata
@ -682,10 +688,11 @@ module.exports.create = function (cfg) {
if (!metadata_cache[channelName]) { metadata_cache[channelName] = msg; }
expired = checkExpired(ctx, channelName);
}
if (expired) { return void cb(); }
if (expired) { return void readMore(); }
msgCount++;
sendMsg(ctx, user, [0, HISTORY_KEEPER_ID, 'MSG', user.id, JSON.stringify(msg)], cb);
sendMsg(ctx, user, [0, HISTORY_KEEPER_ID, 'MSG', user.id, JSON.stringify(msg)], readMore);
}, (err) => {
// If the pad is expired, stop here, we've already sent the error message
if (expired) { return; }
@ -776,9 +783,9 @@ module.exports.create = function (cfg) {
// XXX should we send metadata here too?
// my gut says yes
getHistoryAsync(ctx, parsed[1], -1, false, (msg, cb) => {
getHistoryAsync(ctx, parsed[1], -1, false, (msg, readMore) => {
if (!msg) { return; }
sendMsg(ctx, user, [0, HISTORY_KEEPER_ID, 'MSG', user.id, JSON.stringify(['FULL_HISTORY', msg])], cb);
sendMsg(ctx, user, [0, HISTORY_KEEPER_ID, 'MSG', user.id, JSON.stringify(['FULL_HISTORY', msg])], readMore);
}, (err) => {
let parsedMsg = ['FULL_HISTORY_END', parsed[1]];
if (err) {