Add a basic builder for request message

zuul-core/src/main/java/com/netflix/zuul/message/util/HttpRequestBuilder.java

@@ -0,0 +1,116 @@
+/*
+ * Copyright 2021 Netflix, Inc.
+ *
+ *      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 com.netflix.zuul.message.util;
+
+import com.netflix.zuul.context.SessionContext;
+import com.netflix.zuul.message.Headers;
+import com.netflix.zuul.message.http.HttpQueryParams;
+import com.netflix.zuul.message.http.HttpRequestMessage;
+import com.netflix.zuul.message.http.HttpRequestMessageImpl;
+import io.netty.handler.codec.http.HttpMethod;
+import io.netty.handler.codec.http.HttpVersion;
+import java.util.Objects;
+
+/**
+ * Builder for a zuul http request. *exclusively* for use in unit tests.
+ *
+ * For default values initialized in the constructor:
+ * <pre>
+ * {@code new HttpRequestBuilder(context).withDefaults();}
+ *</pre>
+ *
+ * For overrides :
+ * <pre>
+ * {@code new HttpRequestBuilder(context).withHeaders(httpHeaders).withQueryParams(requestParams).build();}
+ * </pre>
+ * @author Argha C
+ * @since 5/11/21
+ */
+public final class HttpRequestBuilder {
+    private SessionContext sessionContext;
+    private String protocol;
+    private String method;
+    private String path;
+    private HttpQueryParams queryParams;
+    private Headers headers;
+    private String clientIp;
+    private String scheme;
+    private int port;
+    private String serverName;
+    private boolean isBuilt;
+
+    public HttpRequestBuilder(SessionContext context) {
+        sessionContext = Objects.requireNonNull(context);
+        protocol = HttpVersion.HTTP_1_1.text();
+        method = "get";
+        path = "/";
+        queryParams = new HttpQueryParams();
+        headers = new Headers();
+        clientIp = "::1";
+        scheme = "https";
+        port = 443;
+        isBuilt = false;
+    }
+
+    /**
+     * Builds a request with basic defaults
+     *
+     * @return `HttpRequestMessage`
+     */
+    public HttpRequestMessage withDefaults() {
+        return build();
+    }
+
+    public HttpRequestBuilder withHost(String hostName) {
+        serverName = Objects.requireNonNull(hostName);
+        return this;
+    }
+
+    public HttpRequestBuilder withHeaders(Headers requestHeaders) {
+        headers = Objects.requireNonNull(requestHeaders);
+        return this;
+    }
+
+    public HttpRequestBuilder withQueryParams(HttpQueryParams requestParams) {
+        this.queryParams =  Objects.requireNonNull(requestParams);
+        return this;
+    }
+
+    public HttpRequestBuilder withMethod(HttpMethod httpMethod) {
+        method = Objects.requireNonNull(httpMethod).name();
+        return this;
+    }
+
+    public HttpRequestBuilder withUri(String uri) {
+        path = Objects.requireNonNull(uri);
+        return this;
+    }
+
+    /**
+     * Used to build a request with overriden values
+     *
+     * @return `HttpRequestMessage`
+     */
+    public HttpRequestMessage build() {
+        if (isBuilt) {
+            throw new IllegalStateException("Builder must only be invoked once!");
+        }
+        isBuilt = true;
+        return new HttpRequestMessageImpl(sessionContext, protocol, method, path, queryParams, headers, clientIp, scheme, port,
+                serverName);
+    }
+}

zuul-core/src/test/java/com/netflix/zuul/context/DebugTest.java

@@ -34,6 +34,8 @@
 import com.netflix.zuul.message.http.HttpRequestMessageImpl;
 import com.netflix.zuul.message.http.HttpResponseMessage;
 import com.netflix.zuul.message.http.HttpResponseMessageImpl;
+import com.netflix.zuul.message.util.HttpRequestBuilder;
+import io.netty.handler.codec.http.HttpMethod;
 import java.util.List;
 import org.junit.Before;
 import org.junit.Test;
@@ -59,8 +61,10 @@ public void setup() {
         params = new HttpQueryParams();
         params.add("k1", "v1");
 
-        request = new HttpRequestMessageImpl(ctx, "HTTP/1.1", "post", "/some/where",
-                params, headers, "9.9.9.9", "https", 80, "localhost");
+        request = new HttpRequestBuilder(ctx).withMethod(HttpMethod.POST)
+                .withUri("/some/where")
+                .withHeaders(headers)
+                .withQueryParams(params).build();
         request.setBodyAsText("some text");
         request.storeInboundRequest();