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| import * as React from 'react';
import * as PropTypes from 'prop-types';
import ApolloClient, { ApolloError } from 'apollo-client';
import { Observable } from 'apollo-client/util/Observable';
import { DocumentNode } from 'graphql';
import { ZenObservable } from 'zen-observable-ts';
import { OperationVariables } from './types';
const shallowEqual = require('fbjs/lib/shallowEqual');
const invariant = require('invariant');
export interface SubscriptionResult<TData = any> {
loading: boolean;
data?: TData;
error?: ApolloError;
}
export interface SubscriptionProps<TData = any, TVariables = OperationVariables> {
subscription: DocumentNode;
variables?: TVariables;
shouldResubscribe?: boolean;
children: (result: SubscriptionResult<TData>) => React.ReactNode;
}
export interface SubscriptionState<TData = any> {
loading: boolean;
data?: TData;
error?: ApolloError;
}
export interface SubscriptionContext {
client: ApolloClient<Object>;
}
class Subscription<TData = any, TVariables = any> extends React.Component<
SubscriptionProps<TData, TVariables>,
SubscriptionState<TData>
> {
static contextTypes = {
client: PropTypes.object.isRequired,
};
static propTypes = {
subscription: PropTypes.object.isRequired,
variables: PropTypes.object,
children: PropTypes.func.isRequired,
};
private client: ApolloClient<any>;
private queryObservable: Observable<any>;
private querySubscription: ZenObservable.Subscription;
constructor(props: SubscriptionProps<TData, TVariables>, context: SubscriptionContext) {
super(props, context);
invariant(
!!context.client,
`Could not find "client" in the context of Subscription. Wrap the root component in an <ApolloProvider>`,
);
this.client = context.client;
this.initialize(props);
this.state = this.getInitialState();
}
componentDidMount() {
this.startSubscription();
}
componentWillReceiveProps(
nextProps: SubscriptionProps<TData, TVariables>,
nextContext: SubscriptionContext,
) {
Iif (shallowEqual(this.props, nextProps) && this.client === nextContext.client) {
return;
}
const shouldNotResubscribe = this.props.shouldResubscribe === false;
if (this.client !== nextContext.client) {
this.client = nextContext.client;
}
if (!shouldNotResubscribe) {
this.endSubscription();
delete this.queryObservable;
this.initialize(nextProps);
this.startSubscription();
this.setState(this.getInitialState());
return;
}
this.initialize(nextProps);
this.startSubscription();
}
componentWillUnmount() {
this.endSubscription();
}
render() {
const result = Object.assign({}, this.state, {
variables: this.props.variables,
});
return this.props.children(result);
}
private initialize = (props: SubscriptionProps<TData, TVariables>) => {
if (this.queryObservable) return;
this.queryObservable = this.client.subscribe({
query: props.subscription,
variables: props.variables,
});
};
private startSubscription = () => {
if (this.querySubscription) return;
this.querySubscription = this.queryObservable.subscribe({
next: this.updateCurrentData,
error: this.updateError,
});
};
private getInitialState = () => ({
loading: true,
error: undefined,
data: undefined,
});
private updateCurrentData = (result: SubscriptionResult<TData>) => {
this.setState({
data: result.data,
loading: false,
error: undefined,
});
};
private updateError = (error: any) => {
this.setState({
error,
loading: false,
});
};
private endSubscription = () => {
Eif (this.querySubscription) {
this.querySubscription.unsubscribe();
delete this.querySubscription;
}
};
}
export default Subscription;
|