// newClient creates, initializes and returns a new service client instance.
func newClient(cfg aws.Config, handlers request.Handlers, endpoint, signingRegion string) *CloudWatch {
	svc := &CloudWatch{
		Client: client.New(
			cfg,
			metadata.ClientInfo{
				ServiceName:   ServiceName,
				SigningRegion: signingRegion,
				Endpoint:      endpoint,
				APIVersion:    "2010-08-01",
			},
			handlers,
		),
	}

	// Handlers
	svc.Handlers.Sign.PushBack(v4.Sign)
	svc.Handlers.Build.PushBack(query.Build)
	svc.Handlers.Unmarshal.PushBack(query.Unmarshal)
	svc.Handlers.UnmarshalMeta.PushBack(query.UnmarshalMeta)
	svc.Handlers.UnmarshalError.PushBack(query.UnmarshalError)

	// Run custom client initialization if present
	if initClient != nil {
		initClient(svc.Client)
	}

	return svc
}

// newClient creates, initializes and returns a new service client instance.
func newInputService6ProtocolTestClient(cfg aws.Config, handlers request.Handlers, endpoint, signingRegion string) *InputService6ProtocolTest {
	svc := &InputService6ProtocolTest{
		Client: client.New(
			cfg,
			metadata.ClientInfo{
				ServiceName:   "inputservice6protocoltest",
				SigningRegion: signingRegion,
				Endpoint:      endpoint,
				APIVersion:    "",
				JSONVersion:   "1.1",
				TargetPrefix:  "com.amazonaws.foo",
			},
			handlers,
		),
	}

	// Handlers
	svc.Handlers.Sign.PushBack(v4.Sign)
	svc.Handlers.Build.PushBack(jsonrpc.Build)
	svc.Handlers.Unmarshal.PushBack(jsonrpc.Unmarshal)
	svc.Handlers.UnmarshalMeta.PushBack(jsonrpc.UnmarshalMeta)
	svc.Handlers.UnmarshalError.PushBack(jsonrpc.UnmarshalError)

	return svc
}

// NewClient returns a new EC2Metadata client. Should be used to create
// a client when not using a session. Generally using just New with a session
// is preferred.
func NewClient(cfg aws.Config, handlers request.Handlers, endpoint, signingRegion string, opts ...func(*client.Client)) *EC2Metadata {
	// If the default http client is provided, replace it with a custom
	// client using default timeouts.
	if cfg.HTTPClient == http.DefaultClient {
		cfg.HTTPClient = &http.Client{
			Transport: &http.Transport{
				Proxy: http.ProxyFromEnvironment,
				Dial: (&net.Dialer{
					// use a shorter timeout than default because the metadata
					// service is local if it is running, and to fail faster
					// if not running on an ec2 instance.
					Timeout:   5 * time.Second,
					KeepAlive: 30 * time.Second,
				}).Dial,
				TLSHandshakeTimeout: 10 * time.Second,
			},
		}
	}

	svc := &EC2Metadata{
		Client: client.New(
			cfg,
			metadata.ClientInfo{
				ServiceName: ServiceName,
				Endpoint:    endpoint,
				APIVersion:  "latest",
			},
			handlers,
		),
	}

	svc.Handlers.Unmarshal.PushBack(unmarshalHandler)
	svc.Handlers.UnmarshalError.PushBack(unmarshalError)
	svc.Handlers.Validate.Clear()
	svc.Handlers.Validate.PushBack(validateEndpointHandler)

	// Add additional options to the service config
	for _, option := range opts {
		option(svc.Client)
	}

	return svc
}

// newClient creates, initializes and returns a new service client instance.
func newOutputService9ProtocolTestClient(cfg aws.Config, handlers request.Handlers, endpoint, signingRegion string) *OutputService9ProtocolTest {
	svc := &OutputService9ProtocolTest{
		Client: client.New(
			cfg,
			metadata.ClientInfo{
				ServiceName:   "outputservice9protocoltest",
				SigningRegion: signingRegion,
				Endpoint:      endpoint,
				APIVersion:    "",
			},
			handlers,
		),
	}

	// Handlers
	svc.Handlers.Sign.PushBack(v4.Sign)
	svc.Handlers.Build.PushBack(ec2query.Build)
	svc.Handlers.Unmarshal.PushBack(ec2query.Unmarshal)
	svc.Handlers.UnmarshalMeta.PushBack(ec2query.UnmarshalMeta)
	svc.Handlers.UnmarshalError.PushBack(ec2query.UnmarshalError)

	return svc
}