com.undefinedlabs.scope.deps.okhttp3.internal.http.RealInterceptorChain Maven / Gradle / Ivy

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Scope is a APM for tests to give engineering teams unprecedented visibility into their CI process to quickly identify, troubleshoot and fix failed builds. This artifact contains dependencies for Scope.

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package com.undefinedlabs.scope.deps.okhttp3.internal.http;

import com.undefinedlabs.scope.deps.okhttp3.Connection;
import com.undefinedlabs.scope.deps.okhttp3.Interceptor;
import com.undefinedlabs.scope.deps.okhttp3.Request;
import com.undefinedlabs.scope.deps.okhttp3.Response;
import com.undefinedlabs.scope.deps.okhttp3.internal.connection.RealConnection;
import com.undefinedlabs.scope.deps.okhttp3.internal.connection.StreamAllocation;

import java.io.IOException;
import java.util.List;

public final class RealInterceptorChain implements Interceptor.Chain {
    private final List interceptors;
    private final StreamAllocation streamAllocation;
    private final HttpCodec httpCodec;
    private final RealConnection connection;
    private final int index;
    private final Request request;
    private int calls;

    public RealInterceptorChain(List interceptors, StreamAllocation streamAllocation,
                                HttpCodec httpCodec, RealConnection connection, int index, Request request) {
        this.interceptors = interceptors;
        this.connection = connection;
        this.streamAllocation = streamAllocation;
        this.httpCodec = httpCodec;
        this.index = index;
        this.request = request;
    }

    @Override public Connection connection() {
        return connection;
    }

    public StreamAllocation streamAllocation() {
        return streamAllocation;
    }

    public HttpCodec httpStream() {
        return httpCodec;
    }

    @Override public Request request() {
        return request;
    }

    @Override public Response proceed(Request request) throws IOException {
        return proceed(request, streamAllocation, httpCodec, connection);
    }

    public Response proceed(Request request, StreamAllocation streamAllocation, HttpCodec httpCodec,
                            RealConnection connection) throws IOException {
        if (index >= interceptors.size()) throw new AssertionError();

        calls++;

        // If we already have a stream, confirm that the incoming request will use it.
        if (this.httpCodec != null && !this.connection.supportsUrl(request.url())) {
            throw new IllegalStateException("network interceptor " + interceptors.get(index - 1)
                    + " must retain the same host and port");
        }

        // If we already have a stream, confirm that this is the only call to chain.proceed().
        if (this.httpCodec != null && calls > 1) {
            throw new IllegalStateException("network interceptor " + interceptors.get(index - 1)
                    + " must call proceed() exactly once");
        }

        // Call the next interceptor in the chain.
        RealInterceptorChain next = new RealInterceptorChain(
                interceptors, streamAllocation, httpCodec, connection, index + 1, request);
        Interceptor interceptor = interceptors.get(index);
        Response response = interceptor.intercept(next);

        // Confirm that the next interceptor made its required call to chain.proceed().
        if (httpCodec != null && index + 1 < interceptors.size() && next.calls != 1) {
            throw new IllegalStateException("network interceptor " + interceptor
                    + " must call proceed() exactly once");
        }

        // Confirm that the intercepted response isn't null.
        if (response == null) {
            throw new NullPointerException("interceptor " + interceptor + " returned null");
        }

        return response;
    }
}