reproducer for issue #2114

Author: abebeos

src/test/scala/org/ergoplatform/nodeView/state/ErgoStateContextSpec.scala

@@ -8,6 +8,40 @@ import org.ergoplatform.utils.HistoryTestHelpers
 
 class ErgoStateContextSpec extends HistoryTestHelpers {
 
+  // copy from 'Extension validation'
+  property("Extension validation, reproducer i2114") {
+    val chain = genChain(2)
+    val sc = emptyStateContext.appendFullBlock(chain.head).get
+    val fb = chain.last
+    val extension = fb.extension
+    val oldFields = extension.fields
+
+    def fbWithFields(newFields: Seq[(Array[Byte], Array[Byte])]): ErgoFullBlock = {
+      val newExtension = extension.copy(fields = newFields)
+      fb.copy(extension = newExtension)
+    }
+
+    println("\n stressing sc.appendFullBlock() \n")
+    val validMKV = extensionKvGen(Extension.FieldKeySize, Extension.FieldValueMaxSize).sample.get
+    for (i <- 1 to 1000) {
+      printf("%d ", i)
+      sc.appendFullBlock(fbWithFields(validMKV +: oldFields)) shouldBe 'success
+    }
+
+    println("\n\n stressing extensionKvGen() \n")
+    // this will fail, which means that the problems is with 'extensionKvGen()'
+    // the randomness potentially generates now and then invalid data
+    for (i <- 1 to 1000) {
+      val validMKV_looped = extensionKvGen(Extension.FieldKeySize, Extension.FieldValueMaxSize).sample.get
+      printf("%d ", i)
+      sc.appendFullBlock(fbWithFields(validMKV_looped +: oldFields)) shouldBe 'success
+    }
+
+    // locate "Interlinks improperly packed" within 'NipopowAlgos.scala', and set a breakpoint to review
+    // the invalid data ('value' has a length of 64 instead of 33)
+
+  }
+
   property("Header votes") {
     val fb = genChain(1).head
     val header = fb.header
@@ -58,27 +92,34 @@ class ErgoStateContextSpec extends HistoryTestHelpers {
       fb.copy(extension = newExtension)
     }
 
-    // checks, specific for extension
-    // validation of field keys size
-    val imvKey = extensionKvGen(Extension.FieldKeySize - 1, Extension.FieldValueMaxSize).sample.get
-    sc.appendFullBlock(fbWithFields(imvKey +: oldFields)) shouldBe 'failure
-
-    // validation of field value sizes
-    val imvValue = extensionKvGen(Extension.FieldKeySize, Extension.FieldValueMaxSize + 1).sample.get
-    sc.appendFullBlock(fbWithFields(imvValue +: oldFields)) shouldBe 'failure
-
-    // validation of incorrect interlinks
-    val invalidInterlinks = nipopowAlgos.interlinksToExtension(
-      NipopowAlgos.unpackInterlinks(fb.extension.fields).get ++ Seq(fb.header.id)
-    ).fields
-    sc.appendFullBlock(fbWithFields(invalidInterlinks ++ oldFields)) shouldBe 'failure
-
-    // validation of key duplicates in fields
-    val validMKV = extensionKvGen(Extension.FieldKeySize, Extension.FieldValueMaxSize).sample.get
-    sc.appendFullBlock(fbWithFields(Seq(validMKV, validMKV) ++ oldFields)) shouldBe 'failure
-
-    // valid application of correct extension
-    sc.appendFullBlock(fbWithFields(validMKV +: oldFields)) shouldBe 'success
+    // increase loop to 1000 to trigger failure https://github.com/ergoplatform/ergo/issues/2114
+    for (i <- 1 to 1000) {
+      printf("%d ", i)
+
+      // checks, specific for extension
+      // validation of field keys size
+      val imvKey = extensionKvGen(Extension.FieldKeySize - 1, Extension.FieldValueMaxSize).sample.get
+      sc.appendFullBlock(fbWithFields(imvKey +: oldFields)) shouldBe 'failure
+
+      // validation of field value sizes
+      val imvValue = extensionKvGen(Extension.FieldKeySize, Extension.FieldValueMaxSize + 1).sample.get
+// 1st failure (disable to reach 2nd failure)
+      sc.appendFullBlock(fbWithFields(imvValue +: oldFields)) shouldBe 'failure
+
+      // validation of incorrect interlinks
+      val invalidInterlinks = nipopowAlgos.interlinksToExtension(
+        NipopowAlgos.unpackInterlinks(fb.extension.fields).get ++ Seq(fb.header.id)
+      ).fields
+      sc.appendFullBlock(fbWithFields(invalidInterlinks ++ oldFields)) shouldBe 'failure
+
+      // validation of key duplicates in fields
+      val validMKV = extensionKvGen(Extension.FieldKeySize, Extension.FieldValueMaxSize).sample.get
+      sc.appendFullBlock(fbWithFields(Seq(validMKV, validMKV) ++ oldFields)) shouldBe 'failure
+
+      // valid application of correct extension
+// 2nd failure
+      sc.appendFullBlock(fbWithFields(validMKV +: oldFields)) shouldBe 'success
+    }
 
   }