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app/scripts/lib/rpc-method-middleware/handlers/get-provider-state.js
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app/scripts/lib/rpc-method-middleware/handlers/get-provider-state.ts
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import type { | ||
JsonRpcEngineNextCallback, | ||
JsonRpcEngineEndCallback, | ||
} from '@metamask/json-rpc-engine'; | ||
import type { | ||
JsonRpcRequest, | ||
PendingJsonRpcResponse, | ||
JsonRpcParams, | ||
} from '@metamask/utils'; | ||
import { MESSAGE_TYPE } from '../../../../../shared/constants/app'; | ||
import { | ||
HandlerWrapper, | ||
GetProviderState, | ||
ProviderStateHandlerResult, | ||
} from './handlers-helper'; | ||
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type GetProviderStateConstraint<Params extends JsonRpcParams = JsonRpcParams> = | ||
{ | ||
implementation: ( | ||
_req: JsonRpcRequest<Params>, | ||
res: PendingJsonRpcResponse<ProviderStateHandlerResult>, | ||
_next: JsonRpcEngineNextCallback, | ||
end: JsonRpcEngineEndCallback, | ||
{ _getProviderState }: Record<string, GetProviderState>, | ||
) => Promise<void>; | ||
} & HandlerWrapper; | ||
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/** | ||
* This RPC method gets background state relevant to the provider. | ||
* The background sends RPC notifications on state changes, but the provider | ||
* first requests state on initialization. | ||
*/ | ||
const getProviderState = { | ||
methodNames: [MESSAGE_TYPE.GET_PROVIDER_STATE], | ||
implementation: getProviderStateHandler, | ||
hookNames: { | ||
getProviderState: true, | ||
}, | ||
} satisfies GetProviderStateConstraint; | ||
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export default getProviderState; | ||
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/** | ||
* @param req - The JSON-RPC request object. | ||
* @param res - The JSON-RPC response object. | ||
* @param _next - The json-rpc-engine 'next' callback. | ||
* @param end - The json-rpc-engine 'end' callback. | ||
* @param options | ||
* @param options.getProviderState - An async function that gets the current provider state. | ||
*/ | ||
async function getProviderStateHandler< | ||
Params extends JsonRpcParams = JsonRpcParams, | ||
>( | ||
req: JsonRpcRequest<Params>, | ||
res: PendingJsonRpcResponse<ProviderStateHandlerResult>, | ||
_next: JsonRpcEngineNextCallback, | ||
end: JsonRpcEngineEndCallback, | ||
{ getProviderState: _getProviderState }: Record<string, GetProviderState>, | ||
): Promise<void> { | ||
const { origin } = req.origin; | ||
res.result = { | ||
...(await _getProviderState(origin)), | ||
}; | ||
return end(); | ||
} |