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untested implementation of trimHistory

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This commit is contained in:
ansuz
2020-01-23 17:58:24 -05:00
parent c388641479
commit 9cdf54aff2
3 changed files with 211 additions and 41 deletions
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30
lib/historyKeeper.js
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@@ -10,29 +10,13 @@ const Meta = require("./metadata");
const WriteQueue = require("./write-queue");
const BatchRead = require("./batch-read");
const Extras = require("./hk-util.js");
let Log;
const now = function () { return (new Date()).getTime(); };
const ONE_DAY = 1000 * 60 * 60 * 24; // one day in milliseconds
/* getHash
* this function slices off the leading portion of a message which is
most likely unique
* these "hashes" are used to identify particular messages in a channel's history
* clients store "hashes" either in memory or in their drive to query for new messages:
* when reconnecting to a pad
* when connecting to chat or a mailbox
* thus, we can't change this function without invalidating client data which:
* is encrypted clientside
* can't be easily migrated
* don't break it!
*/
const getHash = function (msg) {
if (typeof(msg) !== 'string') {
Log.warn('HK_GET_HASH', 'getHash() called on ' + typeof(msg) + ': ' + msg);
return '';
}
return msg.slice(0,64);
};
const getHash = Extras.getHash;
const tryParse = function (str) {
try {
@@ -185,7 +169,7 @@ module.exports.create = function (cfg) {
if (msg[0] === 0 && msg[2] === 'MSG' && typeof(msg[4]) === 'string') {
// msgObj.offset is API guaranteed by our storage module
// it should always be a valid positive integer
offsetByHash[getHash(msg[4])] = msgObj.offset;
offsetByHash[getHash(msg[4], Log)] = msgObj.offset;
}
// There is a trailing \n at the end of the file
size = msgObj.offset + msgObj.buff.length + 1;
@@ -502,7 +486,7 @@ module.exports.create = function (cfg) {
msgStruct.push(now());
// storeMessage
storeMessage(ctx, channel, JSON.stringify(msgStruct), isCp, getHash(msgStruct[4]));
storeMessage(ctx, channel, JSON.stringify(msgStruct), isCp, getHash(msgStruct[4], Log));
});
};
@@ -601,7 +585,7 @@ module.exports.create = function (cfg) {
const msg = tryParse(msgObj.buff.toString('utf8'));
// if it was undefined then go onto the next message
if (typeof msg === "undefined") { return readMore(); }
if (typeof(msg[4]) !== 'string' || lastKnownHash !== getHash(msg[4])) {
if (typeof(msg[4]) !== 'string' || lastKnownHash !== getHash(msg[4], Log)) {
return void readMore();
}
offset = msgObj.offset;
@@ -672,7 +656,7 @@ module.exports.create = function (cfg) {
var content = parsed[4];
if (typeof(content) !== 'string') { return; }
var hash = getHash(content);
var hash = getHash(content, Log);
if (hash === oldestKnownHash) {
found = true;
}