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dynamic EUM host #6

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24 changes: 23 additions & 1 deletion ...ateway/src/main/java/org/springframework/samples/petclinic/api/ApiGatewayApplication.java
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,8 @@
import org.springframework.web.reactive.function.server.RouterFunctions;
import org.springframework.web.reactive.function.server.ServerResponse;

import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.time.Duration;


Expand Down Expand Up @@ -65,6 +67,9 @@ public WebClient.Builder loadBalancedWebClientBuilder() {
@Value("classpath:/static/index.html")
private Resource indexHtml;

@Value("${EUM_HOST:localhost}")
private String eumHost;

/**
* workaround solution for forwarding to index.html
* @see <a href="https://github.com/spring-projects/spring-boot/issues/9785">#9785</a>
Expand All @@ -73,10 +78,27 @@ public WebClient.Builder loadBalancedWebClientBuilder() {
RouterFunction<?> routerFunction() {
RouterFunction router = RouterFunctions.resources("/**", new ClassPathResource("static/"))
.andRoute(RequestPredicates.GET("/"),
request -> ServerResponse.ok().contentType(MediaType.TEXT_HTML).bodyValue(indexHtml));
request -> ServerResponse.ok().contentType(MediaType.TEXT_HTML)
.bodyValue(injectDynamicEumHost())
);
return router;
}

/**
* workaround solution to use dynamic hosts for EUM instead of just localhost
* @return content of index.html with injected EUM-Host
*/
private String injectDynamicEumHost() {
try {
String indexHtmlContent = new String(indexHtml.getInputStream().readAllBytes(), StandardCharsets.UTF_8);

// Replace the placeholder with the actual host value
return indexHtmlContent.replace("${EUM_HOST}", eumHost);
} catch (IOException e) {
throw new RuntimeException("Could not read index.html");
}
}

/**
* Default Resilience4j circuit breaker configuration
*/
Expand Down
16 changes: 9 additions & 7 deletions spring-petclinic-api-gateway/src/main/resources/static/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -50,15 +50,17 @@
<script src="/scripts/infrastructure/infrastructure.js"></script>
<script src="/scripts/infrastructure/httpErrorHandlingInterceptor.js"></script>

<script src="http://localhost:8085/boomerang/boomerang.js"></script>
<script src="http://localhost:8085/boomerang/plugins/boomerang-opentelemetry.js"></script>
<script src="http://localhost:8085/boomerang/plugins/rt.js"></script>
<script src="http://localhost:8085/boomerang/plugins/auto-xhr.js"></script>
<script src="http://localhost:8085/boomerang/plugins/spa.js"></script>
<script src="http://localhost:8085/boomerang/plugins/history.js"></script>
<!-- ${EUM_HOST} will be replaced with an actual host, while loading the file -->
<!-- see ApiGatewayApplication#injectDynamicEumHost() -->
<script src="http://${EUM_HOST}:8085/boomerang/boomerang.js"></script>
<script src="http://${EUM_HOST}:8085/boomerang/plugins/boomerang-opentelemetry.js"></script>
<script src="http://${EUM_HOST}:8085/boomerang/plugins/rt.js"></script>
<script src="http://${EUM_HOST}:8085/boomerang/plugins/auto-xhr.js"></script>
<script src="http://${EUM_HOST}:8085/boomerang/plugins/spa.js"></script>
<script src="http://${EUM_HOST}:8085/boomerang/plugins/history.js"></script>
<script>
BOOMR.init({
beacon_url: "http://localhost:8085/beacon/"
beacon_url: "http://${EUM_HOST}:8085/beacon/"
});
</script>

Expand Down