Add list-schemas for the embedded repo (close #212)

Author: voropaevp

modules/core/src/main/scala/com.snowplowanalytics.iglu/client/resolver/registries/RegistryLookup.scala

@@ -79,6 +79,13 @@ object RegistryLookup {
   implicit class LookupOps(val repositoryRef: Registry) extends AnyVal with Serializable {
     def lookupSchema[F[_]: RegistryLookup](schemaKey: SchemaKey): F[Either[RegistryError, Json]] =
       RegistryLookup[F].lookup(repositoryRef, schemaKey)
+
+    def list[F[_]: RegistryLookup](
+      vendor: String,
+      name: String,
+      model: Int
+    ): F[Either[RegistryError, SchemaList]] =
+      RegistryLookup[F].list(repositoryRef, vendor: String, name: String, model: Int)
   }
 
   implicit def ioLookupInstance[F[_]](implicit F: Sync[F]): RegistryLookup[F] =
@@ -98,7 +105,10 @@ object RegistryLookup {
       ): F[Either[RegistryError, SchemaList]] =
         registry match {
           case Registry.Http(_, connection) => httpList(connection, vendor, name, model)
-          case _                            => F.pure(RegistryError.NotFound.asLeft)
+          case Registry.Embedded(_, base) =>
+            val path = toSubpath(base, vendor, name)
+            Sync[F].delay(Utils.unsafeEmbeddedList(path, model))
+          case _ => F.pure(RegistryError.NotFound.asLeft)
         }
     }
 
@@ -128,6 +138,9 @@ object RegistryLookup {
           case Registry.Http(_, connection) =>
             val subpath = toSubpath(connection.uri.toString, vendor, name, model)
             Utils.stringToUri(subpath).flatMap(Utils.unsafeHttpList(_, connection.apikey))
+          case Registry.Embedded(_, base) =>
+            val path = toSubpath(base, vendor, name)
+            Utils.unsafeEmbeddedList(path, model)
           case _ =>
             RegistryError.NotFound.asLeft
         }
@@ -151,6 +164,13 @@ object RegistryLookup {
   ): String =
     s"${prefix.stripSuffix("/")}/schemas/$vendor/$name/jsonschema/$model"
 
+  private def toSubpath(
+    prefix: String,
+    vendor: String,
+    name: String
+  ): String =
+    s"${prefix.stripSuffix("/")}/schemas/$vendor/$name/jsonschema"
+
   /**
    * Retrieves an Iglu Schema from the Embedded Iglu Repo as a JSON
    *

modules/core/src/main/scala/com.snowplowanalytics.iglu/client/resolver/registries/Utils.scala

@@ -14,11 +14,14 @@ package com.snowplowanalytics.iglu.client
 package resolver.registries
 
 // Java
-import java.io.InputStream
+import com.snowplowanalytics.iglu.core.{SchemaKey, SchemaVer}
+
+import java.io.{File, InputStream}
 import java.net.URI
 import java.net.http.HttpResponse.BodyHandlers
 import java.net.http.{HttpClient, HttpRequest, HttpResponse}
 import java.time.Duration
+import scala.util.matching.Regex
 
 // Scala
 import scala.io.Source
@@ -29,6 +32,7 @@ import cats.effect.Sync
 import cats.syntax.either._
 import cats.syntax.option._
 import cats.syntax.show._
+import cats.syntax.traverse._
 
 // circe
 import io.circe.parser.parse
@@ -72,6 +76,61 @@ private[registries] object Utils {
         repoFailure(e).asLeft
     }
 
+  def unsafeEmbeddedList(path: String, modelMatch: Int): Either[RegistryError, SchemaList] =
+    try {
+      val d =
+        new File(
+          getClass.getResource(path).getPath
+        ) // this will throw NPE for missing entry in embedded repos
+      val schemaFileRegex: Regex = (".*/schemas/?" + // path to file
+        "([a-zA-Z0-9-_.]+)/" +            // Vendor
+        "([a-zA-Z0-9-_]+)/" +             // Name
+        "([a-zA-Z0-9-_]+)/" +             // Format
+        "([1-9][0-9]*)-(\\d+)-(\\d+)$").r // MODEL, REVISION and ADDITION
+
+      def getFolderContent(d: File): List[String] = {
+        d.listFiles
+          .filter(_.isFile)
+          .toList
+          .filter(_.getName.startsWith(s"${modelMatch.toString}-"))
+          .map(_.getAbsolutePath)
+      }
+
+      val content =
+        if (d.exists & d.isDirectory)
+          getFolderContent(d)
+        else
+          List.empty[String]
+
+      content
+        .traverse {
+          case schemaFileRegex(vendor, name, format, model, revision, addition)
+              if model == modelMatch.toString =>
+            SchemaKey(
+              vendor = vendor,
+              name = name,
+              format = format,
+              version = SchemaVer
+                .Full(model = model.toInt, revision = revision.toInt, addition = addition.toInt)
+            ).asRight
+          case f => RegistryError.RepoFailure(s"Corrupted schema file name at $f").asLeft
+        }
+        .map(_.sortBy(_.version))
+        .flatMap(s =>
+          if (s.isEmpty)
+            RegistryError.NotFound.asLeft
+          else
+            s.asRight
+        )
+        .map(SchemaList.apply)
+    } catch {
+      case NonFatal(e) =>
+        e match {
+          case _: NullPointerException => RegistryError.NotFound.asLeft
+          case _                       => repoFailure(e).asLeft
+        }
+    }
+
   /** Not-RT analog of [[RegistryLookup.embeddedLookup]] */
   def unsafeEmbeddedLookup(path: String): Either[RegistryError, Json] =
     try {
@@ -84,7 +143,10 @@ private[registries] object Utils {
       result
     } catch {
       case NonFatal(e) =>
-        repoFailure(e).asLeft
+        e match {
+          case _: NullPointerException => RegistryError.NotFound.asLeft
+          case _                       => repoFailure(e).asLeft
+        }
     }
 
   /** Non-RT analog of [[RegistryLookup.httpList]] */
@@ -156,6 +218,7 @@ private[registries] object Utils {
     RegistryError.RepoFailure(failure.show)
 
   private[resolver] def repoFailure(failure: Throwable): RegistryError =
-    RegistryError.RepoFailure(failure.getMessage)
-
+    RegistryError.RepoFailure(
+      if (failure.getMessage != null) failure.getMessage else "Unhandled error"
+    )
 }

modules/core/src/test/resources/iglu-test-embedded/schemas/com.snowplowanalytics.iglu-test/test-embedded-list/jsonschema/1-0-0

@@ -15,6 +15,7 @@ package com.snowplowanalytics.iglu.client.resolver.registries
 // Cats
 import cats.effect.IO
 import cats.effect.testing.specs2.CatsEffect
+import com.snowplowanalytics.iglu.core.SchemaList
 
 // circe
 import io.circe.literal._
@@ -38,6 +39,7 @@ class EmbeddedSpec extends Specification with CatsEffect {
   retrieving an existent JSON Schema from an embedded RepositoryRef should work  $e3
   requesting a non-existent JSON Schema from an embedded RepositoryRef should return None  $e4
   requesting a corrupted JSON Schema from an embedded RepositoryRef should return an appropriate Failure  $e5
+  Schema list should work for embedded repo  $e6
   """
 
   val AcmeConfig =
@@ -119,4 +121,37 @@ class EmbeddedSpec extends Specification with CatsEffect {
       .map(result => result must beLeft)
   }
 
+  def e6 = {
+    val schemaList = SchemaList(
+      List(
+        SchemaKey(
+          "com.snowplowanalytics.iglu-test",
+          "test-embedded-list",
+          "jsonschema",
+          SchemaVer.Full(1, 0, 0)
+        ),
+        SchemaKey(
+          "com.snowplowanalytics.iglu-test",
+          "test-embedded-list",
+          "jsonschema",
+          SchemaVer.Full(1, 0, 1)
+        ),
+        SchemaKey(
+          "com.snowplowanalytics.iglu-test",
+          "test-embedded-list",
+          "jsonschema",
+          SchemaVer.Full(1, 2, 0)
+        ),
+        SchemaKey(
+          "com.snowplowanalytics.iglu-test",
+          "test-embedded-list",
+          "jsonschema",
+          SchemaVer.Full(1, 2, 11)
+        )
+      )
+    )
+    SpecHelpers.EmbeddedTest
+      .list[IO]("com.snowplowanalytics.iglu-test", "test-embedded-list", 1)
+      .map(result => result must beRight(schemaList))
+  }
 }