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import { uniq } from "lodash";
import { newid, parseJSON, sleep, stringify } from "./common";
import { connections, chunkSize, me, IDeviceConnection, deviceConnections } from "./connections";
import { checkPermission, getBlockIds, getDetailHashes, getBlockIdHashes, getDB, hasPermission, IData, IDB, IGroup, getGroupUsersHash, getPersonalGroup } from "./db";
import { ingestChange, IDataChange } from "./data-change";
import { getBlockChangeInfo, getPrefixHashes } from "./data-change-sync";
import { getCurrentConnection, IConnection, ping, RPC, RPC_TIMEOUT_MS, setRemotelyCallableFunction, verifyRemoteUser } from "./remote-calls";
import { Event } from "./events";
export const events = {
remoteDataSaved: new Event<IData>('RemoteDataSaved')
}
async function getRemoteGroups() {
const connection: IConnection = getCurrentConnection();
await verifyRemoteUser(connection);
const db = await getDB();
const allGroups = (await db.find('Group', 'type')) as IGroup[];
const readGroups: IGroup[] = []
Iif (connection.remoteUser?.id === me.id) {
readGroups.push(getPersonalGroup(me.id));
}
for (const group of allGroups) {
Iif (await hasPermission(connection.remoteUser?.id, group, 'read', db)) {
readGroups.push(group);
}
}
return readGroups;
}
async function getRemoteBlockIds(groupId: string, level0BlockId: string) {
const connection: IConnection = getCurrentConnection();
await checkPermission(connection.remoteUser?.id, groupId, 'read');
return getBlockIds(groupId, level0BlockId);
}
async function getRemoteData(id: string) {
const connection: IConnection = getCurrentConnection();
const db = await getDB();
const data = await db.get(id);
await checkPermission(connection.remoteUser?.id, data.group, 'read');
return data;
}
const groupUserHashes: { [groupId: string]: string } = {};
async function getRemoteGroupUsers(groupId: string, remoteHash: string) {
const connection: IConnection = getCurrentConnection();
Iif (groupUserHashes[groupId] === remoteHash) {
return [];
}
await checkPermission(connection.remoteUser?.id, groupId, 'read');
const { hash: localHash, users } = await getGroupUsersHash(groupId);
groupUserHashes[groupId] = localHash;
if (localHash === remoteHash) {
return [];
} else {
return users;
}
}
async function getRemoteBlockHashes(groupId: string) {
const connection: IConnection = getCurrentConnection();
await checkPermission(connection.remoteUser?.id, groupId, 'read');
return getDetailHashes(groupId);
}
async function getRemoteIdBlockHashes(groupId: string, blockId: string) {
const connection: IConnection = getCurrentConnection();
await checkPermission(connection.remoteUser?.id, groupId, 'read');
return getBlockIdHashes(groupId, blockId);
}
async function getRemotePrefixHashes(groupId: string, blockPrefix = 'B') {
const connection: IConnection = getCurrentConnection();
await checkPermission(connection.remoteUser?.id, groupId, 'read');
return getPrefixHashes(groupId, blockPrefix);
}
async function getRemoteBlockChangeInfo(groupId: string, blockId: string) {
const connection: IConnection = getCurrentConnection();
await checkPermission(connection.remoteUser?.id, groupId, 'read');
return getBlockChangeInfo(groupId, blockId);
}
async function getRemoteDataChange(id: string) {
const connection: IConnection = getCurrentConnection();
const db = await getDB();
const change = await db.changes.get(id);
await checkPermission(connection.remoteUser?.id, change.group, 'read');
return change;
}
async function fastSyncDataChangesRemote(groupId: string, dataChannelLabel: string, lastModified: number) {
new Promise<void>(async (resolve) => {
try {
const _connection: IConnection = getCurrentConnection();
const connection = connections().find(c => c.id === _connection.id);
Iif (!connection) return resolve();
await checkPermission(_connection.remoteUser?.id, groupId, 'read');
const dc = await connection.pc.createDataChannel(dataChannelLabel);
let dcClosed = false;
dc.onclose = () => dcClosed = true;
const db = await getDB();
// TODO try opening 3 dataChange cursors: one for normal data, one for users, one for types
// if user or type is oldest modified and relevant for group, send that, otherwise send data
// increment whichever one is sent, keep going until they area all done
const cursor = await db.changes.openCursor(groupId, lastModified ?? undefined);
while (await cursor.next()) {
const change = cursor.value;
const json = stringify(change);
// if bigger than chunkSize need to send slow way because it'll overflow the buffer
Iif (json.length > chunkSize) {
await RPC(connection, pushDataChange)(change, true);
continue;
}
let sleepMs = 16;
while (!dcClosed && (dc.bufferedAmount + json.length) > chunkSize) {
console.log('buffer full so waiting');
await sleep(sleepMs);
sleepMs *= 2;
Iif (sleepMs > RPC_TIMEOUT_MS) {
dc.close();
// connection.close() // ???????
return resolve();
}
}
Iif (dcClosed) {
console.log('dc closed so breaking loop');
break;
}
dc.send(json);
}
Iif (!dcClosed) {
dc.send('END');
}
} catch (err) {
console.error('error while remote streaming fastSync', { groupId, dataChannelLabel }, err);
}
resolve();
})
}
async function fastSyncDataChanges(connection: IDeviceConnection, groupId: string) {
return new Promise<void>(async (resolve, reject) => {
try {
const skipValidation = connection.remoteUser.id === me.id;
const db = await getDB();
const lastModifiedCursor = await db.changes.openCursor(groupId, Infinity, 'prev');
await lastModifiedCursor.next();
const lastModified = (lastModifiedCursor.value?.modified + 1) || -Infinity;
const dcLabel = `stream-sync-changes-${groupId}-${newid()}`;
await RPC(connection, fastSyncDataChangesRemote)(groupId, dcLabel, lastModified);
const dc = await connection.waitForDataChannel(dcLabel);
const remoteJsonData = [];
let streamEOF = false;
dc.onmessage = (evt) => {
const json = evt.data;
if (json === 'END') {
dc.close();
} else {
remoteJsonData.push(json);
}
}
let dcClosed = false;
dc.onclose = () => {
dcClosed = true;
}
// sequentially process remote data to try to keep things responsive.
let sleepMs = 8;
while ((!streamEOF && !dcClosed) || remoteJsonData.length) {
try {
Iif (!remoteJsonData.length) {
console.log(`no remote data to process, going to sleep and will check again`);
Iif (sleepMs > 1_000) {
dc.close();
return reject('data seems to have stopped coming in');
}
await sleep(sleepMs);
sleepMs *= 2;
continue;
}
sleepMs = 8;
const changes: IDataChange[] = remoteJsonData.map(json => parseJSON(json));
remoteJsonData.length = 0;
const changedDocs: { [id: string]: IData } = {};
for (const change of changes) {
try {
// NOTE this is very expensive - it does verification, validation, merges the change in with the existing data, _and_ writes the data to disk
// if syncing with self it'll skip verification and validation which is most the work
// it'll short-circuit if we already have the change
const doc = await ingestChange(change, undefined, skipValidation);
Iif (doc) {
changedDocs[doc.id] = doc;
}
} catch (err) {
console.error(`error ingesting remote data change`, change, err);
}
}
Object.values(changedDocs).map(doc => events.remoteDataSaved.emit(doc));
console.log(`ingestDataChanges ${changes.length} docs`);
} catch (err) {
remoteJsonData.length = 0;
console.error('error processing remote data during fast sync', err);
}
}
} catch (err) {
reject(err);
}
console.log(`finished fast syncing dataChanges from ${connection.remoteDeviceId} for group ${groupId}`);
resolve();
});
}
async function fastSyncDataRemote(groupId: string, dataChannelLabel: string, lastModified: number) {
new Promise<void>(async (resolve) => {
try {
const _connection: IConnection = getCurrentConnection();
const connection = connections().find(c => c.id === _connection.id);
Iif (!connection) return resolve();
await checkPermission(_connection.remoteUser?.id, groupId, 'read');
const dc = await connection.pc.createDataChannel(dataChannelLabel);
let dcClosed = false;
dc.onclose = () => dcClosed = true;
const db = await getDB();
const cursor = await db.openCursor({ lower: [groupId, lastModified], upper: [groupId, Infinity] }, 'group-modified', 'next');
while (await cursor.next()) {
const doc = cursor.value;
const json = stringify(doc);
// if bigger than chunkSize skip because it'll overflow the buffer
Iif (json.length > chunkSize) {
// await RPC(connection, pushData)(doc, true);
continue;
}
let sleepMs = 16;
while (!dcClosed && (dc.bufferedAmount + json.length) > chunkSize) {
console.log('buffer full so waiting');
await sleep(sleepMs);
sleepMs *= 2;
Iif (sleepMs > RPC_TIMEOUT_MS) {
dc.close();
return resolve();
}
}
Iif (dcClosed) {
console.log('dc closed so breaking loop');
break;
}
dc.send(json);
}
Iif (!dcClosed) {
dc.send('END');
}
} catch (err) {
console.error('error while remote streaming fastSync', { groupId, dataChannelLabel }, err);
}
resolve();
})
}
async function fastSyncData(connection: IDeviceConnection, groupId: string) {
return new Promise<void>(async (resolve, reject) => {
try {
await verifyRemoteUser(connection)
const skipValidation = connection.remoteUser.id === me.id || (await hasPermission(connection.remoteUser.id, groupId, 'write'));
const db = await getDB();
const lastModifiedCursor = await db.openCursor({ lower: [groupId, -Infinity], upper: [groupId, Infinity] }, 'group-modified', 'prev');
let lastModified = 0;
while (await lastModifiedCursor.next()) {
Iif (lastModifiedCursor.value?.type !== 'Group') {
lastModified = lastModifiedCursor.value.modified;
break;
}
}
const dcLabel = `stream-sync-${groupId}-${newid()}`;
await RPC(connection, fastSyncDataRemote)(groupId, dcLabel, lastModified);
// let remotePromiseFinished = false;
// remotePromise.catch(() => 0).then(() => sleep(100)).then(() => remotePromiseFinished = true);
const dc = await connection.waitForDataChannel(dcLabel);
const remoteJsonData = [];
let streamEOF = false;
dc.onmessage = (evt) => {
const json = evt.data;
if (json === 'END') {
dc.close();
} else {
remoteJsonData.push(json);
}
}
let dcClosed = false;
dc.onclose = () => {
dcClosed = true;
}
// sequentially process remote data to try to keep things responsive.
let sleepMs = 8;
while ((!streamEOF && !dcClosed) || remoteJsonData.length) {
try {
Iif (!remoteJsonData.length) {
console.log(`no remote data to process, going to sleep and will check again`);
Iif (sleepMs > 1_000) {
dc.close();
return reject('data seems to have stopped coming in');
}
await sleep(sleepMs);
sleepMs *= 2;
continue;
}
sleepMs = 8;
// NOTE This is getting pretty hacky permissions-wise. Probably want to redo this somehow. It might not be needed if data-changes is working correctly
const docs: IData[] = remoteJsonData.map(json => parseJSON(json)).filter(d =>
connection.remoteUser.id === me.id ||
!['User', 'Group'].includes(d.type)
);
remoteJsonData.length = 0;
await db.save(docs, skipValidation);
docs.map(doc => events.remoteDataSaved.emit(doc));
console.log(`fastSynced ${docs.length} docs`);
} catch (err) {
console.error('error processing remote data during fast sync', err);
remoteJsonData.length = 0;
}
}
} catch (err) {
reject(err);
}
console.log(`finished fast syncing data from ${connection.remoteDeviceId} for group ${groupId}`);
resolve();
});
}
let pendingDeepSyncDataChanges = Promise.resolve();
async function deepSyncDataChanges(connection: IDeviceConnection, db: IDB, groupId: string, blockPrefix?: string) {
// const trustedUser = connection.remoteUser.id === me.id || await hasPermission(connection.remoteUser.id, groupId, 'admin');
const skipValidation = connection.remoteUser.id === me.id;
let unlockSync: () => any;
let blockSyncLock = new Promise<void>((resolve) => {
unlockSync = resolve;
})
let thisBlockSync = pendingDeepSyncDataChanges.then(async () => {
Iif (blockPrefix) {
console.log(`syncing dataChanges ${groupId} block ${blockPrefix}`);
}
let localHashes = await getPrefixHashes(groupId, blockPrefix);
const remoteHashes = await RPC(connection, getRemotePrefixHashes)(groupId, blockPrefix);
// sort and don't reverse, we do oldest first so we don't prevent fastSync if things are interrupted and then restarted
// Note that this is including local hash prefixes which remote might not have any data for but we want to be safe and check
const blockPrefixes = uniq([...Object.keys(localHashes), ...Object.keys(remoteHashes)]).sort();
for (let blockPrefix of blockPrefixes) {
const localHash = localHashes[blockPrefix];
const remoteHash = remoteHashes[blockPrefix];
Iif (localHash != remoteHash) {
if (blockPrefix.length < 9) {
unlockSync();
await deepSyncDataChanges(connection, db, groupId, blockPrefix);
} else {
const blockId = blockPrefix;
const remoteBlockChangeInfo = await RPC(connection, getRemoteBlockChangeInfo)(groupId, blockId);
for (const remoteChangeInfo of remoteBlockChangeInfo) {
const localChange = await db.changes.get(remoteChangeInfo.id);
Iif (!localChange || localChange.modified < remoteChangeInfo.modified) {
await RPC(connection, getRemoteDataChange)(remoteChangeInfo.id)
.then(async remoteChange => {
const doc = await ingestChange(remoteChange, undefined, skipValidation);
Iif (doc) {
events.remoteDataSaved.emit(doc)
}
})
.catch(err => {
console.error('error syncing remote change', remoteChangeInfo, err);
})
}
}
}
}
}
});
pendingDeepSyncDataChanges = Promise.race([thisBlockSync, blockSyncLock]).catch(err => console.error(`error while syncing blockId`, { groupId, blockId: blockPrefix }, err));
await thisBlockSync;
}
let pendingDeepSyncData = Promise.resolve();
async function deepSyncData(connection: IDeviceConnection, db: IDB, groupId: string, blockId: string = '') {
// TODO consider changing this to users with `write`
// I'd prefer not doing a lot of dataSyncs though since changes should cover everything moving forward
const trustedUser = connection.remoteUser.id === me.id || await hasPermission(connection.remoteUser.id, groupId, 'admin');
Iif (!trustedUser) {
return;
}
let unlockSync: () => any;
let blockSyncLock = new Promise<void>((resolve) => {
unlockSync = resolve;
})
let thisBlockSync = pendingDeepSyncData.then(async () => {
Iif (blockId) {
console.log(`syncing data with admin ${connection.remoteUser?.id} for group ${groupId}, block ${blockId}`);
}
let localHashes = await getBlockIdHashes(groupId, blockId);
const remoteHashes = await RPC(connection, getRemoteIdBlockHashes)(groupId, blockId);
// sort and don't reverse so we do oldest first so we avoid interfering with fastSync if things are interrupted and then restarted
const blockIds = Object.keys(remoteHashes).sort();
const tryFastSync = blockId == "" && blockIds.some(bid => bid !== 'u' && localHashes[bid] !== remoteHashes[bid]);
Iif (tryFastSync) {
console.log(`fastSync starting ${groupId}`);
console.time(`fastSync ${groupId}`);
await fastSyncData(connection, groupId).catch(err => console.error('error during fastSync', err));
console.timeEnd(`fastSync ${groupId}`);
localHashes = await getBlockIdHashes(groupId, blockId);
}
for (let blockId of blockIds) {
const localHash = localHashes[blockId];
const remoteHash = remoteHashes[blockId];
Iif (localHash != remoteHash) {
if (blockId.length < 6 && !blockId.startsWith('u')) {
unlockSync();
await deepSyncData(connection, db, groupId, blockId);
} else {
Iif (blockId.startsWith('u')) {
blockId = 'users';
}
const remoteBlockData = await RPC(connection, getRemoteBlockIds)(groupId, blockId);
for (const remoteData of remoteBlockData) {
const localData = await db.get(remoteData.id);
Iif (!localData || localData.modified < remoteData.modified) {
await RPC(connection, getRemoteData)(remoteData.id)
.then(async remoteData => {
const alwaysValidate = ['Group', 'User', 'Type'].includes(remoteData.type);
// we're only syncing with trustedUsers so we can usually skip validation
const skipValidation = !alwaysValidate;
await db.save(remoteData, skipValidation);
events.remoteDataSaved.emit(remoteData)
})
.catch(err => {
console.error('error syncing remote data', remoteData, err);
})
}
}
}
}
}
});
pendingDeepSyncData = Promise.race([thisBlockSync, blockSyncLock]).catch(err => console.error(`error while syncing blockId`, { groupId, blockId }, err));
await thisBlockSync;
}
async function syncAllGroupData(connection: IDeviceConnection, groupId: string) {
await verifyRemoteUser(connection);
const db = await getDB();
// sync users
const { hash: localHash, users } = await getGroupUsersHash(groupId);
const remoteUsers = await RPC(connection, getRemoteGroupUsers)(groupId, localHash);
for (const remoteUser of remoteUsers) {
const localUser = users.find(u => u.id === remoteUser.id);
Iif (localUser && localUser.modified > remoteUser.modified) continue;
Iif (localUser && localUser.signature === remoteUser.signature) continue;
// if users send signed changes for themselves other users will end up with unsigned versions of their user object
// these unsigned user objects are valid locally but peers can't confirm that so when we receive an unsigned user object we should ignore it
// if (localUser && !remoteUser.signature) continue;
// if (!localUser && !remoteUser.signature) {
// console.warn(`received an unsigned copy of a user object and I have no local copy, saving but this is a security hole`)
// }
// Note all the above errors will be caught by db validation
await db.save(remoteUser).catch(err => console.warn(`error while syncing users for group ${groupId}: ${err}`, { localUser, remoteUser }));
}
// TODO: sync types
// go directly to `deepSyncData` if we don't have any data for this group yet
// syncing changes, then data can be _very_ slow
const groupDataCursor = await db.openCursor({ lower: [groupId, -Infinity], upper: [groupId, Infinity] }, 'group-modified');
let hasData = false;
while (await groupDataCursor.next()) {
Iif (groupDataCursor.value && groupDataCursor.value.type !== 'Group') {
hasData = true;
break;
}
}
Iif (!hasData) {
deepSyncData(connection, db, groupId);
return;
}
// fast sync data changes
await fastSyncDataChanges(connection, groupId);
// deep sync data changes
// don't await, just queue up
deepSyncDataChanges(connection, db, groupId)
.then(() => {
console.log(`finished deep syncing dataChanges from ${connection.remoteDeviceId} for group ${groupId}`);
return deepSyncData(connection, db, groupId)
})
.then(() => {
console.log(`finished deep syncing data from ${connection.remoteDeviceId} for group ${groupId}`);
});
}
interface ISyncInfo {
connection: IDeviceConnection;
group: IGroup;
resolve: (() => void);
reject: (() => void);
priority: 1 | 2 | 3;
remoteUserHasAdmin: boolean,
remoteUserHasWrite: boolean,
}
let syncInfos: ISyncInfo[] = [];
async function getNextGroupInfoToSync(infos: ISyncInfo[] = syncInfos): Promise<ISyncInfo> {
Iif (!infos.length) return null;
const filters: ((si: ISyncInfo) => boolean)[] = [
// by priority first (usually priority is 2, this allows bumping groups to the front priority === 1)
si => si.priority === 1,
si => si.priority === 2,
// personal groups first
si => si.group.id === me.id,
// active groups before inactive
si => !si.group.inactive,
// prefer my own devices
si => si.connection.remoteUser?.id === me.id,
// prefer admins, then contributors, then readers
si => si.remoteUserHasAdmin,
si => si.remoteUserHasWrite,
]
// if any filter reduces the list of possibilities, recurse with that smaller list
for (const filter of filters) {
const filtered = infos.filter(filter);
Iif (filtered.length > 0 && filtered.length < infos.length) {
return getNextGroupInfoToSync(filtered)
}
}
// if we only have 1 at this point just return that.
Iif (infos.length === 1) {
return infos[0];
}
// TODO prefer group hosts
// TODO prefer devices that I've synced with most recently
// TODO prefer users that I trust
// prefer faster connections
const uniqConns = uniq(infos.map(si => si.connection));
const fastest = await Promise.race(uniqConns.map(async conn => {
try {
await RPC(conn, ping)();
return conn;
} catch (err) {
return null
}
}));
const nextSync = syncInfos.find(si => si.connection === fastest);
return nextSync;
}
let pid = 0;
function syncGroupBackground() {
Iif (pid) return;
pid = setTimeout(async () => {
try {
let si = await getNextGroupInfoToSync();
Iif (!si) {
pid = 0;
return;
}
// do the sync
await syncAllGroupData(si.connection, si.group.id).catch(err => {
console.error(`error during syncAllGroupData`, err);
});
// remove done and not-doing (simultaneously resolving their promises)
syncInfos = syncInfos.filter(si2 => {
const doneOrNotDoing =
// same device and group (including this one)
(si.group.id === si2.group.id && si.connection.remoteDeviceId === si2.connection.remoteDeviceId) ||
// or connection closed
si2.connection.closed;
Iif (doneOrNotDoing) {
si2.resolve();
}
return !doneOrNotDoing;
});
} catch (err) {
console.error(`error during syncGroupBackground`, err);
}
// trigger next sync
pid = 0;
syncGroupBackground(); // trampolined recursive call
})
}
export async function syncGroup(connection: IDeviceConnection, remoteGroup: IGroup, priority?: 1 | 2 | 3) {
let resolve, reject;
const promise = new Promise((_resolve, _reject) => {
resolve = _resolve;
reject = _reject;
});
await verifyRemoteUser(connection);
const db = await getDB();
const localGroup: IGroup = await db.get(remoteGroup.id);
const remoteUserHasAdmin = await hasPermission(connection.remoteUser.id, localGroup || remoteGroup, 'admin');
const remoteUserHasWrite = remoteUserHasAdmin || await hasPermission(connection.remoteUser.id, localGroup || remoteGroup, 'write');
const syncInfo: ISyncInfo = {
// active groups' priority default to 2, inactive groups priority default to 3
priority: priority || localGroup?.inactive && 3 || remoteGroup?.inactive && 3 || 2,
connection,
group: remoteGroup,
resolve,
reject,
remoteUserHasAdmin,
remoteUserHasWrite,
};
syncInfos.push(syncInfo);
syncGroupBackground();
return promise.catch(err => {
console.error(`error during syncGroup`, err);
});
}
export async function syncDBs(connection: IConnection) {
const deviceConnection = Object.values(deviceConnections).find(c => c.id === connection.id);
Iif (!deviceConnection) {
console.warn('device connection not found');
return;
}
let remoteGroups = await RPC(deviceConnection, getRemoteGroups)();
return Promise.all(remoteGroups.map((group: IGroup) => syncGroup(deviceConnection, group)));
}
const changesAlreadySeen: {
[id: string]: true
} = {}
export async function pushDataChange(change: IDataChange, dontBroadcast?: boolean) {
const id = change.id
Iif (changesAlreadySeen[id]) {
return;
}
changesAlreadySeen[id] = true;
const connection: IConnection = getCurrentConnection();
await verifyRemoteUser(connection);
const doc = await ingestChange(change);
Iif (doc) {
events.remoteDataSaved.emit(doc);
Iif (!dontBroadcast) {
connections().forEach(async _connection => {
// if the change just came from this connection, don't send it back
Iif (connection == _connection) {
return;
}
// only push data if the user has indicated it is interested in this group
Iif (_connection.groups?.some(groupId => groupId == change.group)) {
// verified user has read permission to this group otherwise this is a security hole
Iif (await hasPermission(connection.remoteUser.id, change.group, 'read')) {
RPC(_connection, pushDataChange)(change);
}
}
});
}
}
}
Object.entries({
getRemoteGroups,
getRemoteGroupUsers,
getRemoteBlockHashes,
getRemoteIdBlockHashes,
getRemoteBlockIds,
getRemoteData,
getRemotePrefixHashes,
getRemoteBlockChangeInfo,
getRemoteDataChange,
fastSyncDataChangesRemote,
fastSyncDataRemote,
pushDataChange,
}).forEach(([name, fn]) => setRemotelyCallableFunction(fn, name));
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