Fix for failing tests

nginx/tests/ServiceLogsClientIp/build.gradle.kts

@@ -3,7 +3,7 @@ import java.io.ByteArrayOutputStream
 
 tasks.named<DockerComposeUp>("test") {
     doLast {
-        // get the docker logs from our nginx service
+        // Get the docker logs from our nginx service.
         val outputStream = ByteArrayOutputStream()
         project.exec {
             commandLine = baseArguments + listOf("logs")
@@ -12,15 +12,28 @@ tasks.named<DockerComposeUp>("test") {
         }
         val output = outputStream.toString()
 
-        // see if the log has a match for the IP we set in the test.sh cURL -H command
-        val pattern = "nginx-1  | 1.2.3.4"
-        val matchingLines = output.lines().filter { line ->
-            line.startsWith(pattern)
+        // See if the log has a match for the IP we set in the test.sh cURL -H command
+        // Output is expected for follow the log_format specified in:
+        //
+        // nginx/rootfs/etc/confd/templates/nginx.conf.tmpl
+        //
+        // Which is:
+        // log_format main '$remote_addr - $remote_user [$time_local] "$request" '
+        //                 '$status $body_bytes_sent "$http_referer" '
+        //                 '"$http_user_agent" "$http_x_forwarded_for"';
+        // 
+        //  A literal example:
+        //
+        // ::1 - - [14/Jul/2024:11:26:36 +0000] "GET / HTTP/1.1" 404 146 "-" "curl/8.5.0" "1.2.3.4"
+        val logEntryPattern = """::1 - - \[\d{2}/[A-Za-z]{3}/\d{4}:\d{2}:\d{2}:\d{2} \+\d{4}\] "GET / HTTP/1\.1" \d{3} \d+ "-" "curl/\d+\.\d+\.\d+" "(?<ip>\d+\.\d+\.\d+\.\d+)"""".toRegex()
+
+        val found = output.lines().any { logEntry ->
+            logEntryPattern.find(logEntry)?.groups?.get("ip")?.value == "1.2.3.4"
         }
 
-        // fail the test if we didn't find any logs with the IP
-        if (matchingLines.isEmpty()) {
-            throw GradleException("No lines found starting with '$pattern'")
+        // Fail the test if we didn't find any logs with the IP.
+        if (!found) {
+            throw GradleException("No log entry found where http_x_forwarded_for is set to 1.2.3.4")
         }
     }
 }