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73 lines
2.0 KiB
73 lines
2.0 KiB
class StandardProvider {
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_isConnected
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_provider
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constructor (provider) {
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this._provider = provider
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this._subscribe()
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// indicate that we've connected, mostly just for standard compliance
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setTimeout(() => {
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this._onConnect()
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})
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}
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_onClose () {
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if (this._isConnected === undefined || this._isConnected) {
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this._provider.emit('close', {
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code: 1011,
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reason: 'Network connection error',
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})
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}
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this._isConnected = false
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}
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_onConnect () {
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!this._isConnected && this._provider.emit('connect')
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this._isConnected = true
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}
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_subscribe () {
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this._provider.on('data', (error, { method, params }) => {
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if (!error && method === 'eth_subscription') {
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this._provider.emit('notification', params.result)
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}
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})
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}
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/**
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* Initiate an RPC method call
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*
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* @param {string} method - RPC method name to call
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* @param {string[]} params - Array of RPC method parameters
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* @returns {Promise<*>} Promise resolving to the result if successful
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*/
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send (method, params = []) {
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return new Promise((resolve, reject) => {
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try {
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this._provider.sendAsync({ id: 1, jsonrpc: '2.0', method, params }, (error, response) => {
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error = error || response.error
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error ? reject(error) : resolve(response)
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})
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} catch (error) {
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reject(error)
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}
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})
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}
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}
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/**
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* Converts a legacy provider into an EIP-1193-compliant standard provider
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* @param {Object} provider - Legacy provider to convert
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* @returns {Object} Standard provider
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*/
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export default function createStandardProvider (provider) {
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const standardProvider = new StandardProvider(provider)
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const sendLegacy = provider.send
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provider.send = (methodOrPayload, callbackOrArgs) => {
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if (typeof methodOrPayload === 'string' && !callbackOrArgs || Array.isArray(callbackOrArgs)) {
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return standardProvider.send(methodOrPayload, callbackOrArgs)
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}
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return sendLegacy.call(provider, methodOrPayload, callbackOrArgs)
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}
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return provider
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}
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