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fix: close web3 subscription on rxjs unsubscribe (#31)

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Richard Ramos 2019-09-10 13:30:13 -04:00 committed by GitHub
parent 8cf6d5c619
commit cf04e028f2
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 35 additions and 16 deletions
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40
src/eventSyncer.js
View File

@ -6,6 +6,8 @@ class EventSyncer {
this.events = events;
this.web3 = web3;
this.db = db;
this.subscriptions = [];
}
track(contractInstance, eventName, filterConditionsOrCb){
@ -46,13 +48,22 @@ class EventSyncer {
this.events.emit("updateDB");
});
this._retrieveEvents(eventKey,
eventSummary.firstKnownBlock,
eventSummary.lastKnownBlock,
filterConditions,
filterConditionsCb,
contractInstance,
eventName);
const eth_subscribe = this._retrieveEvents(eventKey,
eventSummary.firstKnownBlock,
eventSummary.lastKnownBlock,
filterConditions,
filterConditionsCb,
contractInstance,
eventName);
const og_subscribe = sub.subscribe;
sub.subscribe = (next, error, complete) => {
const s = og_subscribe.apply(sub, [next, error, complete]);
s.add(() => { // Removing web3js subscription when rxJS unsubscribe is executed
if(eth_subscribe) eth_subscribe.unsubscribe();
});
return s;
}
return sub;
}
@ -60,7 +71,6 @@ class EventSyncer {
_retrieveEvents(eventKey, firstKnownBlock, lastKnownBlock, filterConditions, filterConditionsCb, contractInstance, eventName) {
// TODO: this should be moved to a 'smart' module
// it should be able to do events X at the time to avoid slow downs as well as the 10k limit
// TODO: filter subscriptions with fromBlock and toBlock
if (firstKnownBlock == 0 || (firstKnownBlock > 0 && firstKnownBlock <= filterConditions.fromBlock)) {
if (filterConditions.toBlock === 'latest') {
@ -68,7 +78,7 @@ class EventSyncer {
this._serveDBEvents(eventKey, filterConditions.fromBlock, lastKnownBlock, filterConditions, filterConditionsCb);
// create a event subscription [lastKnownBlock + 1, ...]
let filters = Object.assign({}, filterConditions, { fromBlock: filterConditions.fromBlock > lastKnownBlock ? filterConditions.fromBlock : lastKnownBlock + 1 });
this._subscribeToEvent(contractInstance.events[eventName], filters, filterConditionsCb, eventKey);
return this._subscribeToEvent(contractInstance.events[eventName], filters, filterConditionsCb, eventKey);
}
else if (filterConditions.toBlock <= lastKnownBlock) {
// emit DB Events [fromBlock, toBlock]
@ -92,7 +102,7 @@ class EventSyncer {
this._serveDBEvents(eventKey, firstKnownBlock, lastKnownBlock, filterConditions, filterConditionsCb);
// create a subscription [lastKnownBlock + 1, ...]
const filters = Object.assign({}, filterConditions, { fromBlock: lastKnownBlock + 1 });
this._subscribeToEvent(contractInstance.events[eventName], filters, filterConditionsCb, eventKey);
return this._subscribeToEvent(contractInstance.events[eventName], filters, filterConditionsCb, eventKey);
}
else if (filterConditions.toBlock <= lastKnownBlock) {
// emit DB Events [fromBlock, toBlock]
@ -126,7 +136,9 @@ class EventSyncer {
}
_subscribeToEvent(event, filterConditions, filterConditionsCb, eventKey) {
event.apply(event, [filterConditions, this._parseEventCBFactory(filterConditions, filterConditionsCb, eventKey) ]);
const s = event.apply(event, [filterConditions, this._parseEventCBFactory(filterConditions, filterConditionsCb, eventKey) ]);
this.subscriptions.push(s);
return s;
}
_parseEventCBFactory = (filterConditions, filterConditionsCb, eventKey) => (err, ev) => {
@ -148,6 +160,12 @@ class EventSyncer {
}
this.events.emit(eventKey, ev);
}
close(){
this.subscriptions.forEach(x => {
x.unsubscribe();
})
}
}
export default EventSyncer;

11
src/subspace.js
View File

@ -27,13 +27,14 @@ export default class Subspace {
return new Promise((resolve, reject) => {
this._db = new Database(this.options.dbFilename, this.events, resolve);
this.db = this._db.db;
this.eventSyncer = new EventSyncer(this.web3, this.events, this._db);
})
}
// TODO: get contract abi/address instead
trackEvent(contractInstance, eventName, filterConditionsOrCb) {
const eventSyncer = new EventSyncer(this.web3, this.events, this._db);
return eventSyncer.track(contractInstance, eventName, filterConditionsOrCb);
return this.eventSyncer.track(contractInstance, eventName, filterConditionsOrCb);
}
_initNewBlocksSubscription() {
@ -64,7 +65,6 @@ export default class Subspace {
// TODO: should save value in database?
trackProperty(contractInstance, propName, methodArgs = [], callArgs = {}) {
const sub = new ReplaySubject();
const method = contractInstance.methods[propName].apply(contractInstance.methods[propName], methodArgs)
@ -132,9 +132,10 @@ export default class Subspace {
return sub.pipe(distinctUntilChanged((a, b) => equal(a, b)));
}
clean(){
close(){
clearInterval(this.intervalTracker);
this.newBlocksSubscription.unsubscribe();
if(this.newBlocksSubscription) this.newBlocksSubscription.unsubscribe();
this.eventSyncer.close();
this.intervalTracker = null;
this.callables = [];
}