Handle unreliable non-JSON Xirsys responses

Closes #4

build.gradle.kts

@@ -19,6 +19,7 @@ val quarkusPlatformArtifactId: String by project
 val quarkusPlatformVersion: String by project
 
 dependencies {
+    implementation("io.quarkus:quarkus-smallrye-fault-tolerance")
     implementation(enforcedPlatform("$quarkusPlatformGroupId:$quarkusPlatformArtifactId:$quarkusPlatformVersion"))
     implementation("io.quarkus:quarkus-config-yaml")
     implementation("io.quarkus:quarkus-scheduler")
@@ -31,7 +32,6 @@ dependencies {
     implementation("io.quarkus:quarkus-smallrye-health")
     implementation("io.quarkus:quarkus-rest-client-reactive-jackson")
     implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
-    implementation("io.quarkus:quarkus-container-image-jib")
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
     implementation("io.quarkus:quarkus-arc")
     implementation("io.quarkus:quarkus-hibernate-orm")

gradle.properties

@@ -1,6 +1,7 @@
 #Gradle properties
+#Sun Nov 19 14:11:53 CET 2023
+quarkusPlatformArtifactId=quarkus-bom
+quarkusPlatformGroupId=io.quarkus.platform
+quarkusPlatformVersion=3.5.0
 quarkusPluginId=io.quarkus
 quarkusPluginVersion=3.5.0
-quarkusPlatformGroupId=io.quarkus.platform
-quarkusPlatformArtifactId=quarkus-bom
-quarkusPlatformVersion=3.5.0

src/main/kotlin/com/faforever/icebreaker/service/xirsys/XirsysApiAdapter.kt

@@ -0,0 +1,87 @@
+package com.faforever.icebreaker.service.xirsys
+
+import com.faforever.icebreaker.config.FafProperties
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.module.kotlin.readValue
+import jakarta.inject.Singleton
+import org.eclipse.microprofile.faulttolerance.Retry
+import org.eclipse.microprofile.rest.client.RestClientBuilder
+import java.io.IOException
+import java.net.URI
+
+/**
+ * The Xirsys API does not comply to proper REST standards, thus we need an adapter.
+ */
+@Singleton
+class XirsysApiAdapter(
+    private val fafProperties: FafProperties,
+    private val xirsysProperties: XirsysProperties,
+    private val objectMapper: ObjectMapper,
+) {
+    private val xirsysApiClient: XirsysApiClient = RestClientBuilder.newBuilder()
+        .baseUri(URI.create(xirsysProperties.baseUrl()))
+        .register(
+            BasicAuthenticationRequestFilter(
+                username = xirsysProperties.ident(),
+                password = xirsysProperties.secret(),
+            ),
+        )
+        .build(XirsysApiClient::class.java)
+
+    @Retry
+    fun listChannel(): List<String> =
+        parseAndUnwrap {
+            xirsysApiClient.listChannel(
+                namespace = xirsysProperties.channelNamespace(),
+                environment = fafProperties.environment(),
+            )
+        }
+
+    @Retry
+    fun createChannel(channelName: String): Map<String, String> =
+        parseAndUnwrap {
+            xirsysApiClient.createChannel(
+                namespace = xirsysProperties.channelNamespace(),
+                environment = fafProperties.environment(),
+                channelName = channelName,
+            )
+        }
+
+    @Retry
+    fun deleteChannel(channelName: String): Int =
+        parseAndUnwrap {
+            xirsysApiClient.deleteChannel(
+                namespace = xirsysProperties.channelNamespace(),
+                environment = fafProperties.environment(),
+                channelName = channelName,
+            )
+        }
+
+    @Retry
+    fun requestIceServers(channelName: String, turnRequest: TurnRequest = TurnRequest()): TurnResponse =
+        parseAndUnwrap {
+            xirsysApiClient.requestIceServers(
+                namespace = xirsysProperties.channelNamespace(),
+                environment = fafProperties.environment(),
+                channelName = channelName,
+                turnRequest = turnRequest,
+            )
+        }
+
+    @Throws(IOException::class)
+    private inline fun <reified T : Any> parseAndUnwrap(getResponse: () -> String): T {
+        val response = getResponse()
+        return try {
+            when (val result = objectMapper.readValue<XirsysResponse<T>>(response)) {
+                is XirsysResponse.Error -> throw XirsysSpecifiedApiException(
+                    errorCode = result.code,
+                    message = "Listing sessions failed: ${result.code}",
+                )
+
+                is XirsysResponse.Success -> result.data
+            }
+        } catch (e: IOException) {
+            throw XirsysUnspecifiedApiException(errorResponse = response, cause = e)
+        }
+    }
+}

src/main/kotlin/com/faforever/icebreaker/service/xirsys/XirsysClient.kt → src/main/kotlin/com/faforever/icebreaker/service/xirsys/XirsysApiClient.kt

@@ -14,30 +14,30 @@ import org.eclipse.microprofile.rest.client.inject.RegisterRestClient
 @ApplicationScoped
 @RegisterRestClient
 @Consumes(MediaType.APPLICATION_JSON)
-interface XirsysClient {
+interface XirsysApiClient {
     @GET
     @Path("/_ns/{namespace}/{environment}")
     @ClientQueryParam(name = "depth", value = ["10"])
     fun listChannel(
         @PathParam("namespace") namespace: String,
         @PathParam("environment") environment: String,
-    ): XirsysResponse<List<String>>
+    ): String
 
     @PUT
     @Path("/_ns/{namespace}/{environment}/{channelName}")
     fun createChannel(
         @PathParam("namespace") namespace: String,
         @PathParam("environment") environment: String,
         @PathParam("channelName") channelName: String,
-    ): XirsysResponse<Map<String, String>>
+    ): String
 
     @DELETE
     @Path("/_ns/{namespace}/{environment}/{channelName}")
     fun deleteChannel(
         @PathParam("namespace") namespace: String,
         @PathParam("environment") environment: String,
         @PathParam("channelName") channelName: String,
-    ): XirsysResponse<Int>
+    ): String
 
     @PUT
     @Path("/_turn/{namespace}/{environment}/{channelName}")
@@ -46,5 +46,5 @@ interface XirsysClient {
         @PathParam("environment") environment: String,
         @PathParam("channelName") channelName: String,
         turnRequest: TurnRequest,
-    ): XirsysResponse<TurnResponse>
+    ): String
 }

src/main/kotlin/com/faforever/icebreaker/service/xirsys/XirsysSessionHandler.kt

@@ -1,36 +1,23 @@
 package com.faforever.icebreaker.service.xirsys
 
-import com.faforever.icebreaker.config.FafProperties
 import com.faforever.icebreaker.service.Server
 import com.faforever.icebreaker.service.Session
 import com.faforever.icebreaker.service.SessionHandler
 import jakarta.inject.Singleton
-import org.eclipse.microprofile.rest.client.RestClientBuilder
 import org.slf4j.Logger
 import org.slf4j.LoggerFactory
-import java.net.URI
 
 private val LOG: Logger = LoggerFactory.getLogger(XirsysSessionHandler::class.java)
 
 @Singleton
 class XirsysSessionHandler(
-    private val fafProperties: FafProperties,
-    private val xirsysProperties: XirsysProperties,
+    xirsysProperties: XirsysProperties,
+    private val xirsysApiAdapter: XirsysApiAdapter,
 ) : SessionHandler {
     companion object {
         const val SERVER_NAME = "xirsys.com"
     }
 
-    private val xirsysClient: XirsysClient = RestClientBuilder.newBuilder()
-        .baseUri(URI.create(xirsysProperties.baseUrl()))
-        .register(
-            BasicAuthenticationRequestFilter(
-                username = xirsysProperties.ident(),
-                password = xirsysProperties.secret(),
-            ),
-        )
-        .build(XirsysClient::class.java)
-
     override val active = xirsysProperties.enabled()
 
     override fun createSession(id: String) {
@@ -41,72 +28,34 @@ class XirsysSessionHandler(
 
         LOG.debug("Creating session id $id")
 
-        val result = xirsysClient.createChannel(
-            namespace = xirsysProperties.channelNamespace(),
-            environment = fafProperties.environment(),
-            channelName = id,
-        )
-
-        if (result is XirsysResponse.Error) {
-            LOG.error("Creating session failed: ${result.code}")
-        }
+        xirsysApiAdapter.createChannel(id)
     }
 
     override fun deleteSession(id: String) {
-        val result = xirsysClient.deleteChannel(
-            namespace = xirsysProperties.channelNamespace(),
-            environment = fafProperties.environment(),
-            channelName = id,
-        )
-
-        if (result is XirsysResponse.Error) {
-            LOG.error("Deleting session failed: ${result.code}")
-        }
+        xirsysApiAdapter.deleteChannel(channelName = id)
     }
 
-    private fun listSessions(): List<String> =
-        when (
-            val result = xirsysClient.listChannel(
-                namespace = xirsysProperties.channelNamespace(),
-                environment = fafProperties.environment(),
-            )
-        ) {
-            is XirsysResponse.Error -> emptyList<String>().also {
-                LOG.error("Listing sessions failed: ${result.code}")
-            }
-
-            is XirsysResponse.Success -> result.data
-        }
+    private fun listSessions(): List<String> = xirsysApiAdapter.listChannel()
 
     override fun getIceServers() = listOf(Server(id = SERVER_NAME, region = "Global"))
 
     override fun getIceServersSession(sessionId: String): List<Session.Server> =
-        when (
-            val result = xirsysClient.requestIceServers(
-                namespace = xirsysProperties.channelNamespace(),
-                environment = fafProperties.environment(),
-                channelName = sessionId,
-                turnRequest = TurnRequest(),
+        xirsysApiAdapter.requestIceServers(
+            channelName = sessionId,
+            turnRequest = TurnRequest(),
+        ).iceServers.let {
+            listOf(
+                Session.Server(
+                    id = SERVER_NAME,
+                    username = it.username,
+                    credential = it.credential,
+                    urls = it.urls.map { url ->
+                        // A sample response looks like "stun:fr-turn1.xirsys.com"
+                        // The java URI class fails to read host and port due to the missing // after the :
+                        // Thus we "normalize" the uri, even though it is technically valid
+                        url.replaceFirst(":", "://")
+                    },
+                ),
             )
-        ) {
-            is XirsysResponse.Error -> emptyList<Session.Server>().also {
-                LOG.error("Requesting ICE servers failed: ${result.code}")
-            }
-
-            is XirsysResponse.Success -> result.data.iceServers.let {
-                listOf(
-                    Session.Server(
-                        id = SERVER_NAME,
-                        username = it.username,
-                        credential = it.credential,
-                        urls = it.urls.map { url ->
-                            // A sample response looks like "stun:fr-turn1.xirsys.com"
-                            // The java URI class fails to read host and port due to the missing // after the :
-                            // Thus we "normalize" the uri, even though it is technically valid
-                            url.replaceFirst(":", "://")
-                        },
-                    ),
-                )
-            }
         }
 }

src/main/kotlin/com/faforever/icebreaker/service/xirsys/XirsysSpecifiedApiException.kt

@@ -0,0 +1,10 @@
+package com.faforever.icebreaker.service.xirsys
+
+import java.io.IOException
+
+interface XirsysApiException
+
+class XirsysSpecifiedApiException(val errorCode: String, override val message: String) :
+    IOException("Xirsys API responded with error code: $errorCode"), XirsysApiException
+class XirsysUnspecifiedApiException(val errorResponse: String, cause: Exception? = null) :
+    IOException("Xirsys API failed with unparseable message: $errorResponse", cause), XirsysApiException