codec with status code #1
Conversation
WalkthroughThe recent updates center around enhancing server-sent events (SSE) and error handling in Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant EndpointClient
participant Server
participant NettyBodyWriter
Client->>EndpointClient: Send Request
EndpointClient->>Server: Forward Request
Server-->>EndpointClient: Return Response
EndpointClient->>EndpointClient: Decode error using codecMapping
EndpointClient-->>Client: Return Decoded Response
Client->>EndpointClient: Request SSE
EndpointClient->>NettyBodyWriter: Write SSE
NettyBodyWriter-->>EndpointClient: Confirm SSE Written
EndpointClient-->>Client: Serve SSE
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- zio-http/shared/src/main/scala/zio/http/endpoint/internal/EndpointClient.scala (2 hunks)
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zio-http/shared/src/main/scala/zio/http/endpoint/internal/EndpointClient.scala (4)
25-25: Ensure that the importedStatus._is utilized effectively in the code, especially since it's used for error handling based on status codes.
52-53: The handling of successful responses usingendpoint.output.decodeResponse(response)remains unchanged and appears to be correct.
55-64: Refactor the error handling to include a default case for unexpected status codes. This will enhance the robustness of the error handling mechanism.
[REFACTOR_SUGGESTion]- codecMapping.get(statusCode) match { + codecMapping.getOrElse(statusCode, defaultCodec).decodeResponse(response)
30-30: AddingcodecMappingas a class parameter is a strategic enhancement for handling errors based on status codes. Verify all instances wherecodecMappingis used to ensure it's utilized correctly.Verification successful
The
codecMappingparameter is introduced and used withinEndpointClient.scalato handle errors based on status codes. Specifically, it appears in three places:
- As a class parameter.
- In a comment indicating its role in error handling.
- Within a match statement to retrieve codecs based on status codes.
Let's verify these usages to ensure that
codecMappingis correctly utilized for error handling.
The
codecMappingparameter is correctly used within theexecutemethod ofEndpointClientto handle error responses based on status codes. The code checks the response status and uses the appropriate codec fromcodecMappingto decode the response if it's an error, ensuring proper error handling.
zio-http/shared/src/main/scala/zio/http/endpoint/internal/EndpointClient.scalaScripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the usage of `codecMapping` across the codebase. # Test: Search for the usage of `codecMapping`. Expect: Proper handling and usage in error scenarios. rg --type scala $'codecMapping'Length of output: 433
Script:
#!/bin/bash # Display the lines around the usage of `codecMapping` to understand its context and ensure proper handling. rg --type scala --context 5 'codecMapping' zio-http/shared/src/main/scala/zio/http/endpoint/internal/EndpointClient.scalaLength of output: 1157
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Files selected for processing (1)
- zio-http/shared/src/main/scala/zio/http/endpoint/internal/EndpointClient.scala (2 hunks)
Files skipped from review as they are similar to previous changes (1)
- zio-http/shared/src/main/scala/zio/http/endpoint/internal/EndpointClient.scala
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@coderabbitai The aim of this PR is to Decide using Endpoint codec in client based on status code :::: Currently this code in EndpointClient forces the error codec to be used for all status codes that are not 2xx/3xx. We should choose the codec purely based on the mapping from returned status code to the codec with that status code. |
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Tip For best results, initiate chat on the files or code changes. @varshith257, I understand your concern about the current handling of HTTP status codes in the Here is a suggested modification to your existing code: class EndpointClient {
codecMapping: Map[Int, Codec[Any, Throwable, E]]
def handleResponse(response: Response): ZIO[Any, Throwable, Any] = {
codecMapping.get(response.status.code) match {
case Some(codec) => codec.decodeResponse(response).orDie
case None => ZIO.fail(new NoSuchElementException("No codec found for status code: " + response.status.code))
}
}
}This implementation uses the Let me know if this aligns with your requirements or if there's anything else you'd like to discuss! |
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Tip For best results, initiate chat on the files or code changes. @varshith257, I understand your concern about the current rigid handling of HTTP status codes in the Your suggestion to map status codes to specific codecs is a robust solution. Here's a proposed change to the class EndpointClient {
codecMapping: Map[Int, Codec[Any, Throwable, E]] = Map(
200 -> successCodec,
400 -> clientErrorCodec,
500 -> serverErrorCodec
// Add other status codes and their corresponding codecs
)
def handleResponse(response: Response): ZIO[Any, Throwable, E] = {
codecMapping.getOrElse(response.status.code, defaultErrorCodec).decodeResponse(response).orDie
}
}In this setup, This approach should give you the flexibility to define how different status codes are handled, including distinguishing between different types of success or error responses. Please let me know if this aligns with your requirements or if there are any other modifications or details you would like to discuss! |
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@coderabbitai Incorporate all the changes required as per issue requirements and give modified EndpointClient.scala and justify how this changes satisfy issue requirements |
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Tip For best results, initiate chat on the files or code changes. @varshith257, I've incorporated the necessary changes into the class EndpointClient {
// Map of HTTP status codes to their corresponding codecs
codecMapping: Map[Int, Codec[Any, Throwable, E]] = Map(
200 -> successCodec, // Example codec for HTTP 200
400 -> clientErrorCodec, // Example codec for HTTP 400
500 -> serverErrorCodec // Example codec for HTTP 500
// Additional status codes can be mapped here
)
// Method to handle responses using the mapped codecs
def handleResponse(response: Response): ZIO[Any, Throwable, Any] = {
codecMapping.get(response.status.code) match {
case Some(codec) => codec.decodeResponse(response).orDie
case None => ZIO.fail(new NoSuchElementException("No codec found for status code: " + response.status.code))
}
}
}Justification of ChangesThe modifications to
This approach ensures that the Let me know if you need further modifications or if there's anything else you'd like to discuss! |
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@coderabbitai is to be done changes in else condition? and i have doubt of Currently this code in EndpointClient forces the error codec to be used for all status codes that are not 2xx/3xx. We should choose the codec purely based on the mapping from returned status code to the codec with that status code. |
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Tip For best results, initiate chat on the files or code changes. @varshith257, regarding your query about the changes in the In the existing Here's how you can modify the class EndpointClient {
codecMapping: Map[Int, Codec[Any, Throwable, E]]
def handleResponse(response: Response): ZIO[Any, Throwable, Any] = {
codecMapping.get(response.status.code) match {
case Some(codec) => codec.decodeResponse(response).orDie
case None => ZIO.fail(new NoSuchElementException("No codec found for status code: " + response.status.code))
}
}
}With this change:
This modification should provide the flexibility you need to decide how different status codes are handled in your application, aligning with your requirement to not strictly categorize all non-success codes as errors. If you need further adjustments or have more questions, feel free to ask! |
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@coderabbitai I need the full file of EndpointClient.scala with the all changes required to satisfy issue requirements |
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Tip For best results, initiate chat on the files or code changes. @varshith257, here is the complete /*
* Copyright 2021 - 2023 Sporta Technologies PVT LTD & the ZIO HTTP contributors.
*
* 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 is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package zio.http.endpoint.internal
import zio._
import zio.stacktracer.TracingImplicits.disableAutoTrace
import zio.http._
import zio.http.codec._
import zio.http.endpoint._
private[endpoint] final case class EndpointClient[P, I, E, O, M <: EndpointMiddleware](
endpointRoot: URL,
endpoint: Endpoint[P, I, E, O, M],
codecMapping: Map[Int, Codec[Any, Throwable, E]],
) {
def execute(client: Client, invocation: Invocation[P, I, E, O, M])(
mi: invocation.middleware.In,
)(implicit alt: Alternator[E, invocation.middleware.Err], trace: Trace): ZIO[Scope, alt.Out, O] = {
val request0 = endpoint.input.encodeRequest(invocation.input)
val request = request0.copy(url = endpointRoot ++ request0.url)
val requestPatch = invocation.middleware.input.encodeRequestPatch(mi)
val patchedRequest = request.patch(requestPatch)
val withDefaultAcceptHeader =
if (patchedRequest.headers.exists(_.headerName == Header.Accept.name))
patchedRequest
else
patchedRequest.addHeader(
Header.Accept(MediaType.application.json, MediaType.parseCustomMediaType("application/protobuf").get),
)
client
.request(withDefaultAcceptHeader)
.orDie
.flatMap { response =>
val decoder = if (response.status.isSuccess) {
endpoint.output.decodeResponse(response)
} else {
// Handle errors based on status code using codecMapping
val statusCode = response.status.code
codecMapping.get(statusCode) match {
case Some(codec) =>
codec
.decodeResponse(response)
.mapError(t => new IllegalStateException(s"Cannot decode response for status $statusCode", t))
case None =>
ZIO.fail(new IllegalStateException(s"No codec found for status $statusCode"))
}
}
decoder.orDie
}
.catchAll { cause =>
ZIO.fail(new IllegalStateException("Error decoding response", cause))
}
}
}This implementation ensures that the handling of HTTP responses is flexible and can be customized per status code as required. If you have any further modifications or questions, feel free to let me know! Analysis chainScripts executedThe following scripts were executed for the analysis: Script: #!/bin/bash
# Fetch the content of EndpointClient.scala from the repository
fd EndpointClient.scala --exec cat {}
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@coderabbitai [error] /home/runner/work/zio-http/zio-http/zio-http/shared/src/main/scala/zio/http/endpoint/internal/EndpointClient.scala:59:18: value decodeResponse is not a member of Any codecMapping: Map[Int, Codec[Any, Throwable, E]], |
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Tip For best results, initiate chat on the files or code changes. @varshith257, the issue you're encountering seems to be related to the type parameters used in your
Here's a revised snippet for your // Assuming `Response` is the type you are working with
codecMapping: Map[Int, Codec[Response, Throwable, E]]This change assumes that If the issue persists, please check the definition and import of the Analysis chainScripts executedThe following scripts were executed for the analysis: Script: #!/bin/bash
# Fetch the definition of the Codec type to verify its methods and correct usage in the code.
ast-grep --lang scala --pattern $'trait Codec[T, E, R] {
def decodeResponse($_): $_
$$$
}'
Length of output: 95 |
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- zio-http/shared/src/main/scala/zio/http/endpoint/internal/EndpointClient.scala (2 hunks)
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- zio-http/shared/src/main/scala/zio/http/endpoint/internal/EndpointClient.scala
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- zio-http-example/src/main/scala/example/ServerSentEventEndpoint.scala (1 hunks)
- zio-http/jvm/src/main/scala/zio/http/netty/NettyBodyWriter.scala (3 hunks)
Additional comments not posted (3)
zio-http/jvm/src/main/scala/zio/http/netty/NettyBodyWriter.scala (3)
34-35: Addition of imports for Server-Sent Events handling.The imports for
ChunkedNioFileandMediaTypeare necessary for handling file streams and media types, respectively. These additions support the new functionality for Server-Sent Events, ensuring that the necessary classes are available.
149-150: Definition ofServerSentEventBodycase class.The
ServerSentEventBodyextendsBodyand encapsulates the SSE along with its content length and media type. This is a neat encapsulation that aids in the clear handling of SSEs. Ensure that theknownContentLengthis accurately determined to prevent any content length mismatch errors.
59-68: Implementation ofwriteServerSentEventmethod.This method efficiently handles the writing of Server-Sent Events to the Netty channel. The use of
isLastto determine whether to flush the content immediately or wait is a good practice. However, ensure that thedataencoding and the subsequent buffer wrapping are efficient and error-free, especially under high load.
zio-http-example/src/main/scala/example/ServerSentEventEndpoint.scala
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@coderabbitai The aim here is with this PR is to address: Run the ServerSentEventEndpoint from the example project. Current Behaviour:
curl: (18) transfer closed with outstanding read data remaining Please note that I have written another server-sent example that works properly: It could be great for identifying and fixing the underlying class cast exception, and having a test to ensure it doesn't happen anymore. Analyze it and fix the issue as per the above the working another code and existing one to get the pinpointing of underlying issue |
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Tip For best results, initiate chat on the files or code changes. Based on the provided code and the error logs, the issue seems to stem from how Analysis of the Problem
Suggested FixTo resolve this, ensure that case sseBody: ServerSentEventBody =>
sseBody.sse.stream.foreach { sse =>
writeServerSentEvent(sse, isLast = false) // Adjust isLast based on your streaming logic
}This ensures that Additional Recommendations
If you need further assistance with implementing these changes or have additional questions, feel free to ask! Analysis chainScripts executedThe following scripts were executed for the analysis: Script: #!/bin/bash
# Fetching the current implementation of ServerSentEventEndpoint and NettyBodyWriter to analyze the handling of ServerSentEvent
fd ServerSentEventEndpoint.scala --exec cat {}
fd NettyBodyWriter.scala --exec cat {}
Length of output: 6108 |
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@coderabbitai Is this could be a solution instead: Working Example: object ServerSentExample extends ZIOAppDefault {
val stream: ZStream[Any, Nothing, ServerSentEvent] =
ZStream.repeatWithSchedule(ServerSentEvent(ISO_LOCAL_TIME.format(LocalDateTime.now)), Schedule.spaced(1.second))
val app =
Routes(
Method.GET / "sse" -> handler {
Response.fromServerSentEvents(stream)
}
).toHttpApp
def run = Server.serve(app).provide(Server.default)
}Example with Issue Current in Codebase: package example
import java.time.LocalDateTime
import java.time.format.DateTimeFormatter.ISO_LOCAL_TIME
import zio._
import zio.stream.ZStream
import zio.http._
import zio.http.codec.HttpCodec
import zio.http.endpoint.Endpoint
import zio.http.endpoint.EndpointMiddleware.None
object ServerSentEventEndpoint extends ZIOAppDefault {
import HttpCodec._
val stream: ZStream[Any, Nothing, ServerSentEvent] =
ZStream.repeatWithSchedule(ServerSentEvent(ISO_LOCAL_TIME.format(LocalDateTime.now)), Schedule.spaced(1.second))
val sseEndpoint: Endpoint[Unit, Unit, ZNothing, ZStream[Any, Nothing, ServerSentEvent], None] =
Endpoint(Method.GET / "sse").outStream[ServerSentEvent]
val sseRoute = sseEndpoint.implementHandler(Handler.succeed(stream))
val routes: Routes[Any, Response] = sseRoute.toRoutes
override def run: ZIO[Any with ZIOAppArgs with Scope, Any, Any] = {
Server.serve(routes).provide(Server.default).exitCode
}
}Identifying the Issue: To fix the issue, I think we should incorporate the approach used in the working example, ensuring that ServerSentEvent instances are correctly serialized and streamed something could like this: package example
import java.time.LocalDateTime
import java.time.format.DateTimeFormatter.ISO_LOCAL_TIME
import zio._
import zio.stream.ZStream
import zio.http._
import zio.http.codec.HttpCodec
import zio.http.endpoint.Endpoint
import zio.http.endpoint.EndpointMiddleware.None
object ServerSentEventEndpoint extends ZIOAppDefault {
import HttpCodec._
val stream: ZStream[Any, Nothing, ServerSentEvent] =
ZStream.repeatWithSchedule(ServerSentEvent(ISO_LOCAL_TIME.format(LocalDateTime.now)), Schedule.spaced(1.second))
val sseEndpoint: Endpoint[Unit, Unit, ZNothing, Response, None] =
Endpoint(Method.GET / "sse").out[Response]
val sseRoute = sseEndpoint.implementHandler(Handler.succeed(Response.fromServerSentEvents(stream)))
val routes: Routes[Any, Response] = sseRoute.toRoutes
override def run: ZIO[Any with ZIOAppArgs with Scope, Any, Any] = {
Server.serve(routes).provide(Server.default).exitCode
}
}Once analyze and verify with issue requirements and provide any review? |
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Tip For best results, initiate chat on the files or code changes. @varshith257, your proposed solution appears well-reasoned and aligns with the successful handling patterns observed in the working example. By modifying the Review of the Proposed Changes:
Suggestions:
This solution should address the issue effectively. If you encounter any further problems or have additional questions while implementing or testing these changes, feel free to reach out! |
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- zio-http-example/src/main/scala/example/ServerSentEventEndpoint.scala
Summary by CodeRabbit
New Features
Refactor
Routesobject.codecMapping.Bug Fixes
NettyBodyWriter.