build: Migrate to flat project structure

This change updates the project structure to become flattened.
Previously, the simulator, frontend and API each lived into their own
directory.

With this change, all modules of the project live in the top-level
directory of the repository. This should improve discoverability of
modules of the project.

1 files changed, 186 insertions, 0 deletions

diff --git a/opendc-serverless/opendc-serverless-service/src/test/kotlin/org/opendc/serverless/service/ServerlessServiceTest.kt b/opendc-serverless/opendc-serverless-service/src/test/kotlin/org/opendc/serverless/service/ServerlessServiceTest.kt
new file mode 100644
index 00000000..d9f5ee81
--- /dev/null
+++ b/opendc-serverless/opendc-serverless-service/src/test/kotlin/org/opendc/serverless/service/ServerlessServiceTest.kt
@@ -0,0 +1,186 @@
+/*
+ * Copyright (c) 2021 AtLarge Research
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package org.opendc.serverless.service
+
+import io.mockk.*
+import io.opentelemetry.api.metrics.MeterProvider
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertDoesNotThrow
+import org.junit.jupiter.api.assertThrows
+import org.opendc.serverless.api.ServerlessFunction
+import org.opendc.serverless.service.deployer.FunctionDeployer
+import org.opendc.serverless.service.deployer.FunctionInstance
+import org.opendc.serverless.service.deployer.FunctionInstanceState
+import org.opendc.simulator.core.runBlockingSimulation
+import java.util.*
+
+/**
+ * Test suite for the [ServerlessService] implementation.
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+internal class ServerlessServiceTest {
+
+    @Test
+    fun testClientState() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = assertDoesNotThrow { service.newClient() }
+        assertDoesNotThrow { client.close() }
+
+        assertThrows<IllegalStateException> { client.queryFunctions() }
+        assertThrows<IllegalStateException> { client.newFunction("test", 128) }
+        assertThrows<IllegalStateException> { client.invoke("test") }
+        assertThrows<IllegalStateException> { client.findFunction(UUID.randomUUID()) }
+        assertThrows<IllegalStateException> { client.findFunction("name") }
+    }
+
+    @Test
+    fun testClientInvokeUnknown() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+
+        assertThrows<IllegalArgumentException> { client.invoke("test") }
+    }
+
+    @Test
+    fun testClientFunctionCreation() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+
+        val function = client.newFunction("test", 128)
+
+        assertEquals("test", function.name)
+    }
+
+    @Test
+    fun testClientFunctionQuery() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+
+        assertEquals(emptyList<ServerlessFunction>(), client.queryFunctions())
+
+        val function = client.newFunction("test", 128)
+
+        assertEquals(listOf(function), client.queryFunctions())
+    }
+
+    @Test
+    fun testClientFunctionFindById() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+
+        assertEquals(emptyList<ServerlessFunction>(), client.queryFunctions())
+
+        val function = client.newFunction("test", 128)
+
+        assertNotNull(client.findFunction(function.uid))
+    }
+
+    @Test
+    fun testClientFunctionFindByName() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+
+        assertEquals(emptyList<ServerlessFunction>(), client.queryFunctions())
+
+        val function = client.newFunction("test", 128)
+
+        assertNotNull(client.findFunction(function.name))
+    }
+
+    @Test
+    fun testClientFunctionDuplicateName() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+
+        client.newFunction("test", 128)
+
+        assertThrows<IllegalArgumentException> { client.newFunction("test", 128) }
+    }
+
+    @Test
+    fun testClientFunctionDelete() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+        val function = client.newFunction("test", 128)
+        assertNotNull(client.findFunction(function.uid))
+        function.delete()
+        assertNull(client.findFunction(function.uid))
+
+        // Delete should be idempotent
+        function.delete()
+    }
+
+    @Test
+    fun testClientFunctionCannotInvokeDeleted() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val service = ServerlessService(coroutineContext, clock, meter, mockk(), mockk())
+
+        val client = service.newClient()
+        val function = client.newFunction("test", 128)
+        assertNotNull(client.findFunction(function.uid))
+        function.delete()
+
+        assertThrows<IllegalStateException> { function.invoke() }
+    }
+
+    @Test
+    fun testClientFunctionInvoke() = runBlockingSimulation {
+        val meter = MeterProvider.noop().get("opendc-serverless")
+        val deployer = mockk<FunctionDeployer>()
+        val service = ServerlessService(coroutineContext, clock, meter, deployer, mockk())
+
+        every { deployer.deploy(any()) } answers {
+            object : FunctionInstance {
+                override val state: FunctionInstanceState = FunctionInstanceState.Idle
+                override val function: FunctionObject = it.invocation.args[0] as FunctionObject
+
+                override suspend fun invoke() {}
+
+                override fun close() {}
+            }
+        }
+
+        val client = service.newClient()
+        val function = client.newFunction("test", 128)
+
+        function.invoke()
+    }
+}