Adds ktor+netty-based API

build.gradle.kts

@@ -28,6 +28,11 @@ dependencies {
     implementation("org.apache.commons", "commons-math3", "3.6.1")
     implementation("org.jetbrains:annotations:23.0.0")
 
+    implementation("com.google.code.gson:gson:2.9.0")
+
+    implementation("io.ktor:ktor-server-core:2.0.2")
+    implementation("io.ktor:ktor-server-netty:2.0.2")
+
     testImplementation("org.assertj", "assertj-core", "3.22.0")
     testImplementation("org.junit.jupiter", "junit-jupiter-api", "5.8.2")
     testRuntimeOnly("org.junit.jupiter", "junit-jupiter-engine", "5.8.2")

src/main/kotlin/org/ageseries/libage/api/LibageApiResponse.kt

@@ -0,0 +1,31 @@
+package org.ageseries.libage.api
+
+import com.google.gson.Gson
+import io.ktor.http.*
+import io.ktor.server.application.*
+import io.ktor.server.response.*
+
+val gson = Gson()
+
+data class LibageApiResponse(val crashed: Boolean, val why: String?, val json: String?, val code: Int) {
+    suspend fun respond(call: ApplicationCall) {
+        call.respondText(ContentType.Application.Json, HttpStatusCode.fromValue(code)) {
+            gson.toJson(
+                mapOf(
+                    Pair("crashed", crashed),
+                    Pair("why", why),
+                    Pair("result", json)
+                )
+            )
+        }
+    }
+}
+
+suspend fun ApplicationCall.libageApiResponse(provider: suspend () -> String?) {
+    try {
+        val output = provider.invoke()
+        LibageApiResponse(false, null, output, 200).respond(this)
+    } catch (e: Exception) {
+        LibageApiResponse(true, e.stackTraceToString(), null, 500).respond(this)
+    }
+}

src/main/kotlin/org/ageseries/libage/api/Server.kt

@@ -0,0 +1,56 @@
+package org.ageseries.libage.api
+
+import com.google.gson.Gson
+import io.ktor.server.application.*
+import io.ktor.server.engine.*
+import io.ktor.server.netty.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import org.ageseries.libage.sim.electrical.mna.Circuit
+import org.ageseries.libage.sim.electrical.mna.component.Component
+import org.ageseries.libage.sim.electrical.mna.component.Resistor
+import org.ageseries.libage.sim.electrical.mna.component.VoltageSource
+import java.util.*
+import kotlin.collections.MutableList
+import kotlin.collections.mutableListOf
+import kotlin.collections.mutableMapOf
+import kotlin.collections.set
+
+data class CircuitBundle(var circuit: Circuit, var components: MutableList<Component>)
+
+val circuits = mutableMapOf<UUID, CircuitBundle>()
+
+fun loadTestCircuits() {
+    val c = Circuit()
+    val r = Resistor()
+    val vs = VoltageSource()
+
+    c.add(vs, r)
+
+    vs.connect(0, r, 0)
+    vs.connect(1, r, 1)
+    vs.ground(0)
+
+    vs.potential = 10.0
+    r.resistance = 10.0
+
+    circuits[UUID.randomUUID()] = CircuitBundle(c, mutableListOf(r, vs))
+}
+
+fun main() {
+    loadTestCircuits()
+
+    embeddedServer(Netty, port = 8080) {
+        routing {
+            get("/") {
+                call.respondText("libage api endpoint")
+            }
+            get("/circuits.json") {
+
+                call.libageApiResponse {
+                    gson.toJson(circuits)
+                }
+            }
+        }
+    }.start(wait = true)
+}