Added initial GET and POST endpoints

src/main/kotlin/routes/LibraryRoutes.kt

@@ -1,17 +1,32 @@
 package codes.kalar.routes
 
+import codes.kalar.exception.DbElementInsertionException
+import codes.kalar.exception.DbElementNotFoundException
 import codes.kalar.model.Library
+import codes.kalar.model.NewLibrary
+import codes.kalar.service.LibraryService
+import io.ktor.http.*
 import io.ktor.server.application.*
 import io.ktor.server.request.*
 import io.ktor.server.response.*
 import io.ktor.server.routing.*
 import java.sql.Connection
+import java.sql.SQLException
 
 fun Application.configureLibraryRoutes(dbConnection: Connection) {
+    val libraryService = LibraryService(dbConnection)
 
     routing {
         get("/libraries") {
-            call.respondText("Libraries are neat!")
+            try {
+                val id = call.parameters["id"]?.toLong() ?: throw IllegalArgumentException("query parameter required")
+                val library = libraryService.read(id)
+                call.respond(HttpStatusCode.OK, library.toString())
+            } catch (cause: DbElementNotFoundException) {
+                call.respond(HttpStatusCode.BadRequest, cause.message ?: "Unable to find Library.")
+            } catch (cause: IllegalArgumentException) {
+                call.respond(HttpStatusCode.BadRequest, cause.message ?: "Missing 'id' parameter.")
+            }
         }
 
         get("/libraries/{libraryId}/items/{itemId}") {
@@ -19,8 +34,13 @@ fun Application.configureLibraryRoutes(dbConnection: Connection) {
         }
 
         post("/libraries") {
-            val library = call.receive<Library>()
-            call.respondText("${library.name} is posted")
+            val library = call.receive<NewLibrary>()
+            try {
+                val id = libraryService.create(library)
+                call.respondText("${library.name} is posted with the ID: $id")
+            } catch (cause: DbElementInsertionException) {
+                call.respond(HttpStatusCode.BadRequest, cause.message ?: "Unable to insert Library.")
+            }
         }
 
         patch("/libraries") {