e-book

purchase-contract-service.ts

public confirmDelivery(contractAddress: string): Observable<string> {

const contract: Contract = new ethers.Contract(contractAddress, 
    this.abi, this.provider.getSigner());
const token = contract.buyerConfirmReceived();

return from(token)
  .pipe(
    switchMap((tx: any) => {

      console.log('buyerConfirmReceived Tx:', tx);
      // Wait for transaction to be mined 
      // Returned a Promise which would resolve to 
      //the TransactionReceipt once it is mined.
      return from(tx.wait()).pipe(
        tap((txReceipt: any) => console.log('txReceipt: ', txReceipt)),

        // The receipt will have an "events" Array, which will have
        // the emitted event "LogReceivedByBuyer" from the contract 
        map(txReceipt => txReceipt.events.pop()),
        tap(txEvent => console.log('event: ', txEvent.event)),
        mapTo(contractAddress),
      )
    }))
}