You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: handler.go
    path of file: ./repos/google-cloud-go/spanner/test/cloudexecutor/executor/internal/inputstream
    
    the code of the file until where you have to start completion: // Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License
    
func (h *CloudStreamHandler) Execute() error {
	log.Println("ExecuteActionAsync RPC called. Start handling input stream")

	var c *actions.ExecutionFlowContext
	func() {
		h.mu.Lock()
		defer h.mu.Unlock()
		c = &actions.ExecutionFlowContext{}
		h.executionFlowContext = c
	}()

	// In case this function returns abruptly, or client misbehaves, make sure to dispose of
	// transactions.
	defer func() {
		c.CloseOpenTransactions()
	}()

	ctx := context.Background()
	// Main loop that receives and executes actions.
	for {
		req, err := h.Stream.Recv()
		if err == io.EOF {
			log.Println("Client called Done, half-closed the stream")
			if h.executionFlowContext != nil && h.executionFlowContext.DbClient != nil {
				log.Println("Closing the client object in execution flow context")
				h.executionFlowContext.DbClient.Close()
			}
			break
		}
		if err != nil {
			log.Printf("Failed to receive request from client: %v", err)
			return err
		}
		if err = h.startHandlingRequest(ctx, req); err != nil {
			log.Printf("Failed to handle request %v, Client ends the stream with error: %v", req, err)
			// TODO(sriharshach): should we throw the error here instead of nil?
			return nil
		}
	}
	log.Println("Done executing actions")
	return nil
}