[rust][reqwest] fix broken export (#6586)

* fix broken export

* add tests

Author: wing328

bin/rust-petstore-reqwest-async.sh

@@ -27,6 +27,6 @@ fi
 
 # if you've executed sbt assembly previously it will use that instead.
 export JAVA_OPTS="${JAVA_OPTS} -Xmx1024M -DloggerPath=conf/log4j.properties $@"
-ags="generate -t modules/openapi-generator/src/main/resources/rust -i modules/openapi-generator/src/test/resources/2_0/petstore.yaml -g rust --library reqwest -o samples/client/petstore/rust/reqwest/petstore-async --additional-properties supportAsync=true,packageName=petstore-reqwest-async $@"
+ags="generate -t modules/openapi-generator/src/main/resources/rust -i modules/openapi-generator/src/test/resources/2_0/petstore.yaml -g rust --library reqwest -o samples/client/petstore/rust/reqwest/petstore-async --additional-properties supportAsync=true,useSingleRequestParameter=true,packageName=petstore-reqwest-async $@"
 
 java $JAVA_OPTS -jar $executable $ags

modules/openapi-generator/src/main/resources/rust/reqwest/api_mod.mustache

@@ -46,7 +46,7 @@ pub use self::{{{classFilename}}}::{ {{{operationId}}} };
 {{#vendorExtensions.x-group-parameters}}
 {{#allParams}}
 {{#-first}}
-pub use self::{{{classFilename}}}::{{{operationIdCamelCase}}} as {{{classname}}}{{{operationIdCamelCase}}};
+pub use self::{{{classFilename}}}::{{{operationIdCamelCase}}}Params as {{{classname}}}{{{operationIdCamelCase}}}Params;
 {{/-first}}
 {{/allParams}}
 {{/vendorExtensions.x-group-parameters}}

pom.xml

@@ -1168,6 +1168,7 @@
                 <module>samples/client/petstore/cpp-qt5</module>
                 <module>samples/client/petstore/rust</module>
                 <module>samples/client/petstore/rust/reqwest/petstore</module>
+                <module>samples/client/petstore/rust/reqwest/petstore-async</module>
                 <module>samples/client/petstore/php/OpenAPIClient-php</module>
                 <module>samples/openapi3/client/petstore/php/OpenAPIClient-php</module>
                 <!--<module>samples/client/petstore/javascript-apollo</module>-->

samples/client/petstore/rust/reqwest/petstore-async/pom.xml

@@ -0,0 +1,46 @@
+<project>
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>org.openapitools</groupId>
+    <artifactId>RustReqwestAsyncClientTests</artifactId>
+    <packaging>pom</packaging>
+    <version>1.0-SNAPSHOT</version>
+    <name>Rust Reqwest Async Petstore Client</name>
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>copy-dependencies</goal>
+                        </goals>
+                        <configuration>
+                            <outputDirectory>${project.build.directory}</outputDirectory>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <version>1.2.1</version>
+                <executions>
+                    <execution>
+                        <id>bundle-test</id>
+                        <phase>integration-test</phase>
+                        <goals>
+                            <goal>exec</goal>
+                        </goals>
+                        <configuration>
+                            <executable>cargo</executable>
+                            <arguments>
+                                <argument>build</argument>
+                            </arguments>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>