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import jsonBigint from 'json-bigint'
import WebSocket from 'isomorphic-ws'
import {createPatch} from 'rfc6902'
import {AddOperation, RemoveOperation, ReplaceOperation} from 'rfc6902/diff'
import {createClient, Client as SubscriptionClient} from '../../graphql-ws/src'
import {
Network,
Environment,
ClientOptions,
Client,
FlexibleRequestBody,
SubscriptionHandlers,
PatchedSubscriptionHandlers,
PatchOperation,
ObservableSubscription,
} from '../types'
import {formatRequestBody, resolveJsonPointer} from './utils'
const {parse} = jsonBigint({
useNativeBigInt: true,
})
// generate types
//https://github.com/evanw/esbuild/issues/95#issuecomment-1007485134
export default class HgraphClient implements Client {
endpoint: string
headers: Record<string, string>
subscriptionClient: SubscriptionClient
private subscriptions: ObservableSubscription[]
constructor(options?: ClientOptions) {
// add to BigInt prototype for JSON.stringify
if (options?.patchBigIntToJSON !== false) {
BigInt.prototype['toJSON'] = function () {
if (Number.MIN_SAFE_INTEGER < this && this < Number.MAX_SAFE_INTEGER)
return Number(this)
else return this.toString()
}
}
this.endpoint = `https://${
options?.network || Network.HederaTestnet
}.api.hgraph.${options?.environment || Environment.Development}/v1/graphql`
this.headers = {
'content-type': 'application/json',
...(options?.headers ?? {}),
...(options?.token && {authorization: `Bearer ${options.token}`}),
}
const identifier = options?.token || options?.headers['x-api-key']
const url = identifier
? this.endpoint
.replace('https', 'wss')
.replace('graphql', `${encodeURIComponent(identifier)}/graphql`)
: this.endpoint.replace('https', 'wss')
this.subscriptionClient = createClient({
url,
webSocketImpl: WebSocket,
connectionParams: this.headers,
jsonParse: parse,
})
this.subscriptions = []
}
async query(
flexibleRequestBody: FlexibleRequestBody,
abortSignal?: AbortSignal
) {
const body = formatRequestBody(flexibleRequestBody)
const response = await fetch(this.endpoint, {
method: 'POST',
headers: this.headers,
body: JSON.stringify(body),
signal: abortSignal,
})
Iif (!response.ok)
throw new Error(`${response.status} - ${response.statusText}`)
return parse(await response.text())
}
removeSubscription(observable: ObservableSubscription) {
observable.unsubscribe()
}
removeAllSubscriptions() {
this.getSubscriptions().forEach((observable) => observable.unsubscribe())
}
getSubscriptions() {
//copy of original array
return [...this.subscriptions]
}
/**
* @deprecated Use {@link getSubscriptions} instead.
*/
getSubscribtions() {
return this.getSubscriptions()
}
subscribe(
flexibleRequestBody: FlexibleRequestBody,
handlers: SubscriptionHandlers
) {
const body = formatRequestBody(flexibleRequestBody)
const observableSubscription: ObservableSubscription = {
handlers,
unsubscribe: null,
}
const cleanUpSubscription = (observable: ObservableSubscription) => {
this.subscriptions = this.subscriptions.filter(
(subscription) => subscription != observable
)
observableSubscription.unsubscribe = () => {
throw new Error('This subscription has already been unsubscribed')
}
}
const observableHandlers: SubscriptionHandlers = {
...handlers,
error: (errors) => {
cleanUpSubscription(observableSubscription)
observableSubscription.handlers.error(errors)
},
complete: () => {
cleanUpSubscription(observableSubscription)
observableSubscription.handlers.complete()
},
}
const unsubscribe = this.subscriptionClient.subscribe(
body,
observableHandlers
)
observableSubscription.unsubscribe = () => {
cleanUpSubscription(observableSubscription)
unsubscribe()
}
this.subscriptions.push(observableSubscription)
return observableSubscription
}
patchedSubscribe(
flexibleRequestBody: FlexibleRequestBody,
handlers: PatchedSubscriptionHandlers
) {
let prevData = null
const patchedHandlers: SubscriptionHandlers = {
...handlers,
next: (data) => {
let patches: PatchOperation[] = []
if (prevData) {
patches = createPatch(prevData, data).map(
(operation: AddOperation | ReplaceOperation | RemoveOperation) => {
return {
...operation,
//add value to remove operation
value:
operation.op == 'remove'
? resolveJsonPointer(prevData, operation.path)
: operation.value,
}
}
)
}
prevData = data
handlers.next(data, patches)
},
}
return this.subscribe(flexibleRequestBody, patchedHandlers)
}
}
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