We Keep Coding

Change request body in ServerHttpRequestDecorator using AbstractGatewayFilterFactory - Webflux

Spring Boot Version: 2.5.1,
Spring Cloud Version: 2020.0.3
Hello guys !!!
I need your help ...
My question is that I can't modify the request body in spring gateway. Follow:
I have a MobileGatewayFilterFactory class that extends from AbstractGatewayFilterFactory where the apply method returns a custom filter: MobileGatewayFilter.
#Component
class MobileGatewayFilterFactory :
AbstractGatewayFilterFactory<MobileGatewayFilterFactory.Config>(Config::class.java),
Ordered {
override fun apply(config: Config): GatewayFilter {
logger.info { "Loading MobileGatewayFilter with config ${config.className}, ${config.execution}, ${config.custom}" }
return MobileGatewayFilter(config)
}
override fun getOrder(): Int {
return NettyWriteResponseFilter.WRITE_RESPONSE_FILTER_ORDER - 1
}
data class Config(
val className: String,
val execution: String,
val custom: String?
)
}
So, inside the MobileGatewayFilter class I implement the business rules to determine which filter is running: PRE or POST filter. This is done in the filter method of the MobileGatewayFilter class where there is a condition to determine the type of decoration being executed, using reflection. If it is a request, the ServerHttpRequestDecorator is executed and a ServerHttpResponseDecorator otherwise.
class MobileGatewayFilter(private val config: MobileGatewayFilterFactory.Config) : GatewayFilter, Ordered {
override fun filter(exchange: ServerWebExchange, chain: GatewayFilterChain): Mono<Void> {
return when (config.execution) {
"PRE" -> chain.filter(exchange.mutate().request(decoratorRequest(exchange)).build())
"POST" -> chain.filter(exchange.mutate().response(decoratorResponse(exchange)).build())
else -> chain.filter(exchange)
}
}
override fun getOrder(): Int {
return NettyWriteResponseFilter.WRITE_RESPONSE_FILTER_ORDER - 1
}
private fun decoratorResponse(exchange: ServerWebExchange): ServerHttpResponse {
val aClass = Class.forName(config.className)
val obj = aClass.getConstructor(ServerHttpResponse::class.java, MobileGatewayFilterFactory.Config::class.java)
return obj.newInstance(exchange.response, config) as ServerHttpResponseDecorator
}
private fun decoratorRequest(exchange: ServerWebExchange): ServerHttpRequest {
val aClass = Class.forName(config.className)
val obj = aClass.getConstructor(ServerHttpRequest::class.java, MobileGatewayFilterFactory.Config::class.java)
return obj.newInstance(exchange.request, config) as ServerHttpRequestDecorator
}
}
Furthermore, I have a CustomerDataBodyDecorator that extends the ServerHttpRequestDecorator and overrides the getBody method. The getBody method is where the request body must be modified.
class CustomerDataBodyDecorator(
private val exchange: ServerHttpRequest,
private val config: MobileGatewayFilterFactory.Config
) : ServerHttpRequestDecorator(exchange) {
override fun getBody(): Flux<DataBuffer> {
logger.info { "getBody chamado ..." }
val body: Flux<DataBuffer> = exchange.body
var requestData = ""
body.subscribe {
val content = ByteArray(it.readableByteCount())
it.read(content)
DataBufferUtils.release(it)
requestData = String(content, Charset.forName("UTF-8"))
logger.info { "Request: $requestData" }
}
val factory = DefaultDataBufferFactory()
val buffer = factory.wrap(requestData.toByteArray())
return Flux.just(buffer)
}
}
However, the above code doesn't work because the return is executed first with empty requestData and after subscribe method is executed. I know that in Webflux the subscribe method is necessary to indicate to the publisher the information consumption needs
application.yml
id: opengw-mobile-simulation
uri: ${custom.resources.opengw}
predicates:
- Path=/opengw/v1/mobile/simulation
filters:
- name: Mobile
args:
className: br.com.decorator.CustomerDataBodyDecorator
execution: PRE
custom: ${custom.resources.customer}
- RewritePath=/opengw/v1/(?<segment>/?.*), /$\{segment}
I read several topics here but I couldn't find a solution that worked.
How can I read and then modify the request body of the Flux object in this scenario?

show progress bar before fetching data from server using retrofit

i am working on an online shopping application using retrofit, coroutine, livedata, mvvm,...
i want to show progress bar before fetching data from server for afew seconds
if i have one api request i can show that but in this app i have multiple request
what should i do in this situation how i should show progress bar??
Api Service
#GET("homeslider.php")
suspend fun getSliderImages(): Response<List<Model.Slider>>
#GET("amazingoffer.php")
suspend fun getAmazingProduct(): Response<List<Model.AmazingProduct>>
#GET("handsImages.php")
suspend fun getHandsFreeData(
#Query(
"handsfree_id"
) handsfree_id: Int
): Response<List<Model.HandsFreeImages>>
#GET("handsfreemoreinfo.php")
suspend fun gethandsfreemoreinfo(): Response<List<Model.HandsFreeMore>>
#GET("wristmetadata.php")
suspend fun getWristWatchMetaData(
#Query(
"wrist_id"
) wrist_id: Int
): Response<List<Model.WristWatch>>
repository
fun getSliderImages(): LiveData<List<Model.Slider>> {
val data = MutableLiveData<List<Model.Slider>>()
val job = Job()
applicationScope.launch(IO + job) {
val response = api.getSliderImages()
withContext(Main + SupervisorJob(job)) {
data.value = response.body()
}
job.complete()
job.cancel()
}
return data
}
fun getAmazingOffer(): LiveData<List<Model.AmazingProduct>> {
val data = MutableLiveData<List<Model.AmazingProduct>>()
val job = Job()
applicationScope.launch(IO + job) {
val response = api.getAmazingProduct()
withContext(Main + SupervisorJob(job)) {
data.value = response.body()
}
job.complete()
job.cancel()
}
return data
}
fun getHandsFreeData(handsree_id: Int): LiveData<List<Model.HandsFreeImages>> {
val dfData = MutableLiveData<List<Model.HandsFreeImages>>()
val job = Job()
applicationScope.launch(IO + job) {
val response = api.getHandsFreeData(handsree_id)
withContext(Main + SupervisorJob(job)) {
dfData.value = response.body()
}
job.complete()
job.cancel()
}
return dfData
}
fun getHandsFreeMore(): LiveData<List<Model.HandsFreeMore>> {
val data = MutableLiveData<List<Model.HandsFreeMore>>()
val job = Job()
applicationScope.launch(IO + job) {
val response = api.gethandsfreemoreinfo()
withContext(Main + SupervisorJob(job)) {
data.value = response.body()
}
job.complete()
job.cancel()
}
return data
}
VIEWMODEL
fun getSliderImages() = repository.getSliderImages()
fun getAmazingOffer() = repository.getAmazingOffer()
fun recieveAdvertise() = repository.recieveAdvertise()
fun dailyShoes(context: Context) = repository.getDailyShoes(context)
i will appreciate your help

I couldn't help but notice that your repository contains lots of repetitive code. first point to learn here is that all that logic in Repository, it usually goes in the ViewModel. second thing is that you are using applicationScope to launch your coroutines, which usually is done using viewModelScope(takes care of cancellation) object which is available in every viewModel.
So first we have to take care of that repetitive code and move it to ViewModel. So your viewModel would now look like
class YourViewModel: ViewModel() {
// Your other init code, repo creation etc
// Live data objects for progressBar and error, we will observe these in Fragment/Activity
val showProgress: MutableLiveData<Boolean> = MutableLiveData()
val errorMessage: MutableLiveData<String> = MutableLiveData()
/**
* A Generic api caller, which updates the given live data object with the api result
* and internally takes care of progress bar visibility. */
private fun <T> callApiAndPost(liveData: MutableLiveData<T>,
apiCall: () -> Response<T> ) = viewModelScope.launch {
try{
showProgress.postValue(true) // Show prgress bar when api call is active
if(result.code() == 200) { liveData.postValue(result.body()) }
else{ errorMessage.postValue("Network call failed, try again") }
showProgress.postValue(false)
}
catch (e: Exception){
errorMessage.postValue("Network call failed, try again")
showProgress.postValue(false)
}
}
/******** Now all your API call methods should be called as *************/
// First declare the live data object which will contain the api result
val sliderData: MutableLiveData<List<Model.Slider>> = MutableLiveData()
// Now call the API as
fun getSliderImages() = callApiAndPost(sliderData) {
repository.getSliderImages()
}
}
After that remove all the logic from Repository and make it simply call the network methods as
suspend fun getSliderImages() = api.getSliderImages() // simply delegate to network layer
And finally to display the progress bar, simply observe the showProgress LiveData object in your Activity/Fragment as
viewModel.showProgress.observer(this, Observer{
progressBar.visibility = if(it) View.VISIBLE else View.GONE
}

First create a enum class status:
enum class Status {
SUCCESS,
ERROR,
LOADING
}
Then create resource class like this:
data class Resource<out T>(val status: Status, val data: T?, val message: String?) {
companion object {
fun <T> success(data: T?): Resource<T> {
return Resource(Status.SUCCESS, data, null)
}
fun <T> error(msg: String, data: T?): Resource<T> {
return Resource(Status.ERROR, data, msg)
}
fun <T> loading(data: T?): Resource<T> {
return Resource(Status.LOADING, data, null)
}
}
}
Now add your request to a list of response:
var list = java.util.ArrayList<Response<*>>()
suspend fun getApis() = list.addAll(
listOf(
api.advertise(),
api.getAmazingProduct(),
api.dailyShoes(),
api.getSliderImages(),
.
.
.
)
)
In your viewmodel class:
private val _apis = MutableLiveData<Resource<*>>()
val apis: LiveData<Resource<*>>
get() = _apis
init {
getAllApi()
}
fun getAllApi() {
val job = Job()
viewModelScope.launch(IO + job) {
_apis.postValue(
Resource.loading(null)
)
delay(2000)
repository.getApis().let {
withContext(Main + SupervisorJob(job)) {
it.let {
if (it) {
_apis.postValue(Resource.success(it))
} else {
_apis.postValue(Resource.error("Unknown error eccured", null))
}
}
}
}
job.complete()
job.cancel()
}
}
Now you can use status to show progress like this . use this part in your target fragment:
private fun setProgress() {
viewModel.apis.observe(viewLifecycleOwner) {
when (it.status) {
Status.SUCCESS -> {
binding.apply {
progress.visibility = View.INVISIBLE
line1.visibility = View.VISIBLE
parentscroll.visibility = View.VISIBLE
}
}
Status.ERROR -> {
binding.apply {
progress.visibility = View.INVISIBLE
line1.visibility = View.INVISIBLE
parentscroll.visibility = View.INVISIBLE
}
}
Status.LOADING -> {
binding.apply {
progress.visibility = View.VISIBLE
line1.visibility = View.INVISIBLE
parentscroll.visibility = View.INVISIBLE
}
}
}
}
}
I hope you find it useful.

Apache Camel Dynamic Routing Flow On Exception

I have successfully created few routes overriding configure() method of RouteBuilder. A for loop is used to generate routes on application startup, for eg:
Route1: from("direct:Route1").to("netty-http:http://localhost:8080/route1)
Route2: from("direct:Route2").to("netty-http:http://localhost:8081/route2)
Route3: from("direct:Route3").to("netty-http:http://localhost:8082/route3)
Route4: from("direct:Route4").to("netty-http:http://localhost:8083/route4)
Route5: from("direct:Route5").to("netty-http:http://localhost:8084/route5)
for (endpoint in endpoints.iterator()) {
from("direct:" + endpoint.getEndpointRouteName())
.process(getProcessor(endpoint.getEndpointProcessor(), endpoint.getEndpointRouteName(), objectMapper))
.setHeader(Exchange.HTTP_METHOD, simple(endpoint.getEndpointRequestMethod()))
.setHeader(Exchange.CONTENT_TYPE, constant(endpoint.getEndpointContentType()))
.to("netty-http:" + endpoint.getEndpointUrl())
}
private fun getProcessor(processorClassName: String, name: String, objectMapper: ObjectMapper): Processor {
var processorClass = Class.forName("com.demo.camelpoc.processors.$name.$processorClassName")
return processorClass.getDeclaredConstructor(ObjectMapper::class.java).newInstance(objectMapper) as Processor
}
And there is a source endpoint which starts the workflow. For example the default workflow generated in runtime:
// Workflow
from("netty-http:$sourceUrl").process {
it.setProperty("Workflow", workflowMap)
}
.dynamicRouter(bean(DynamicRouteBean::class.java, "route(*, *, ${startEndpoint})"))
where workflowMap (Used in DynamicRouteBean) is a map of endpoint strings like Key: "direct:Route1 " Value : "direct:Route2", Key: "direct:Route2 " Value : "direct:Route3"... etc
Requirement: Retry sending to the same endpoint in the workflow when exception is thrown in that particular route
For eg:
Lets say, an exception occurs at direct:Route2, I want to retry sending to direct:Route2.
Here is my DynamicRouteBean class.
class DynamicRouteBean {
fun route(
#Header(Exchange.SLIP_ENDPOINT) previousRoute: String?,
exchange: Exchange,
startEndpoint: String
): String? {
if(checkException(exchange)) {
return exchange.getProperty(Exchange.SLIP_ENDPOINT) as String
}
if (exchange.getProperty(Properties.STOP_ROUTE) != null && exchange.getProperty(Properties.STOP_ROUTE) == true) {
return null
}
val workflow: MutableMap<String, Pair<String, String?>> =
exchange.getProperty("Workflow") as MutableMap<String, Pair<String, String?>>
return when (previousRoute) {
null ->
startEndpoint
else -> {
val message = exchange.getIn(NettyHttpMessage::class.java)
// Signifies last endpoint and thus means end of the route
if (!workflow.containsKey(previousRoute)) {
return null
}
if (message?.getHeader(previousRoute.substring(9)) != null) {
val isSuccess = message.getHeader(previousRoute.substring(9)) == true
if (isSuccess) {
"${workflow[previousRoute]?.first}"
} else if (workflow[previousRoute]?.second != null) {
"${workflow[previousRoute]?.second}"
} else {
null
}
} else {
null
}
}
}
}
When I return current Exchange.SLIP_ENDPOINT property as String on exception, it doesn't call that endpoint again but exception message is returned back to the consumer.
Whereas it works in normal cases when there is no exception.
Suggestions would be very helpful on handling this scenario.

Webflux: Logging Method Request and Response Using AOP

I am trying to log, method input/output using the aop approach in Web-flux. I was able to log request using following code ,but had trouble printing response and I see both request and response are printing as request,How can i print response.Is AOP is better solution for logging in reactive approach or filter/controller advice
#Aspect
#Component
class LogAspect(private val log: KLogger) {
#Around("#annotation(Loggable)")
#Throws(Throwable::class)
fun logAround(joinPoint: ProceedingJoinPoint): Any? {
val start = System.currentTimeMillis()
return when (val result: Any = joinPoint.proceed()) {
is Mono<*> -> {
val traceId = AtomicReference("")
result
.doOnSuccess { o ->
if (traceId.get().isNotEmpty()) {
MDC.put("correlationId", traceId.get())
}
var response: Any = ""
if (Objects.nonNull(o)) {
response = o.toString()
}
log.info(
"Enter: {}.{}() with argument[s] = {}",
joinPoint.signature.declaringTypeName, joinPoint.signature.name,
joinPoint.args
)
log.info(
"Exit: {}.{}() had arguments = {}, with Response = {}, Execution time = {} ms",
joinPoint.signature.declaringTypeName, joinPoint.signature.name,
joinPoint.args[0],
response, System.currentTimeMillis() - start
)
}
.subscriberContext { context ->
val contextTmp: Context = context as Context
if (contextTmp.hasKey("correlationId")) {
traceId.set(contextTmp.get("correlationId"))
MDC.put("correlationId", contextTmp.get("correlationId"))
}
context
}
}
else ->
{
log.warn(
"Body type is not Mono for {}.{}()",
joinPoint.signature.declaringTypeName,
joinPoint.signature.name
)
result
}
}
}
}

PHP - convert JAVA / JS Object to PHP array

I am requesting some data from Facebook over JAVA in android and sending it to the server:
Address[addressLines=[0:"Königspl., 86150 Augsburg, Germany"],feature=Königsplatz,admin=Bayern,sub-admin=Schwaben,locality=Augsburg,thoroughfare=Königsplatz,postalCode=86150,countryCode=DE,countryName=Germany,hasLatitude=true,latitude=48.366384499999995,hasLongitude=true,longitude=10.8943626,phone=null,url=null,extras=null]
I don't know what exactly this is, JAVA Object or I don't know..
I already tried: $array = json_decode($data, true); and it returns NULL
What is it and how do I convert it to PHP Array?
EDIT:
This is the JAVA (actually kotlin) code I use to generate the data:
val geocoder = Geocoder(this, Locale.ENGLISH)
try {
val addresses = geocoder.getFromLocation(48.366512, 10.894446, 1)
if (addresses != null)
{
val returnedAddress = addresses[0]
val strReturnedAddress = StringBuilder("Address:\n")
for (i in 0 until returnedAddress.maxAddressLineIndex) {
strReturnedAddress.append(returnedAddress.getAddressLine(i)).append("\n")
}
geocoderStuff = returnedAddress.toString()
} else
{
// NO ADDRESS
}
} catch (e: IOException) {
e.printStackTrace()
}
And this how I send it:
val params = RequestParams()
params.put("geocoder", geocoderStuff)
letsDoSomeNetworking(params)
private fun letsDoSomeNetworking(params: RequestParams) {
// AsyncHttpClient belongs to the loopj dependency.
val client = AsyncHttpClient()
client.get("http://www.bla.com/android/fb_access.php", params, object : JsonHttpResponseHandler()
{
override fun onSuccess(statusCode: Int, headers: Array<Header>?, response: JSONObject?)
{
// success
}
override fun onFailure(statusCode: Int, headers: Array<Header>?, e: Throwable, response: JSONObject?)
{
// error
}
})
}

The solution is to use gson library on JAVA/Kotlin side after getting the data:
val returnedAddress = addresses[0]
val strReturnedAddress = StringBuilder("Address:\n")
for (i in 0 until returnedAddress.maxAddressLineIndex) {
strReturnedAddress.append(returnedAddress.getAddressLine(i)).append("\n")
}
val gson = Gson() // HERE
val json = gson.toJson(returnedAddress) // HERE
geocoderStuff = json