fork art feature

Add the ability to have ascii fork art. Will read from a resource file called the fork name. If none exists, then it'll just do what's done today.

I added placeholders just using figlet output, but this should enable us to take community contributions for any kind of ascii upgrade things... we just want to make sure they're sensible as they'll go to screen.

Signed-off-by: Paul Harris <paul.harris@consensys.net>

ethereum/spec/src/main/java/tech/pegasys/teku/spec/ForkSchedule.java

@@ -15,16 +15,21 @@
 
 import static com.google.common.base.Preconditions.checkState;
 
+import com.google.common.io.Resources;
+import java.nio.charset.StandardCharsets;
 import java.util.Comparator;
 import java.util.EnumMap;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.NavigableMap;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.TreeMap;
 import java.util.stream.Stream;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 import tech.pegasys.teku.infrastructure.bytes.Bytes4;
 import tech.pegasys.teku.infrastructure.collections.TekuPair;
 import tech.pegasys.teku.infrastructure.logging.EventLogger;
@@ -33,6 +38,7 @@
 import tech.pegasys.teku.spec.datastructures.util.ForkAndSpecMilestone;
 
 public class ForkSchedule {
+  private static final Logger LOG = LogManager.getLogger();
   private final NavigableMap<UInt64, SpecMilestone> epochToMilestone;
   private final NavigableMap<UInt64, SpecMilestone> slotToMilestone;
   private final NavigableMap<UInt64, SpecMilestone> genesisOffsetToMilestone;
@@ -135,7 +141,16 @@ public void reportActivatingMilestones(final UInt64 epoch) {
     if (activatingMilestone == null) {
       return;
     }
-    EventLogger.EVENT_LOG.networkUpgradeActivated(epoch, activatingMilestone.name());
+
+    final String resourceName = activatingMilestone.name().toLowerCase(Locale.ROOT) + ".txt";
+    String banner = "";
+    try {
+      banner =
+          Resources.toString(this.getClass().getResource(resourceName), StandardCharsets.UTF_8);
+    } catch (Exception ex) {
+      LOG.debug("failed to read resource file", ex);
+    }
+    EventLogger.EVENT_LOG.networkUpgradeActivated(epoch, activatingMilestone.name(), banner);
   }
 
   public SpecMilestone getSpecMilestoneAtEpoch(final UInt64 epoch) {

ethereum/spec/src/main/resources/tech/pegasys/teku/spec/altair.txt

@@ -0,0 +1,6 @@
+
+                    _    _ _        _
+                   / \  | | |_ __ _(_)_ __
+                  / _ \ | | __/ _` | | '__|
+                 / ___ \| | || (_| | | |
+                /_/   \_\_|\__\__,_|_|_|

ethereum/spec/src/main/resources/tech/pegasys/teku/spec/bellatrix.txt

@@ -0,0 +1,6 @@
+
+            ____       _ _       _        _
+           | __ )  ___| | | __ _| |_ _ __(_)_  __
+           |  _ \ / _ \ | |/ _` | __| '__| \ \/ /
+           | |_) |  __/ | | (_| | |_| |  | |>  <
+           |____/ \___|_|_|\__,_|\__|_|  |_/_/\_\

ethereum/spec/src/main/resources/tech/pegasys/teku/spec/capella.txt

@@ -0,0 +1,7 @@
+
+               ____                 _ _
+              / ___|__ _ _ __   ___| | | __ _
+             | |   / _` | '_ \ / _ \ | |/ _` |
+             | |__| (_| | |_) |  __/ | | (_| |
+              \____\__,_| .__/ \___|_|_|\__,_|
+                        |_|

ethereum/spec/src/main/resources/tech/pegasys/teku/spec/deneb.txt

@@ -0,0 +1,6 @@
+
+                ____                  _
+               |  _ \  ___ _ __   ___| |__
+               | | | |/ _ \ '_ \ / _ \ '_ \
+               | |_| |  __/ | | |  __/ |_) |
+               |____/ \___|_| |_|\___|_.__/

ethereum/spec/src/main/resources/tech/pegasys/teku/spec/electra.txt

@@ -0,0 +1,6 @@
+
+              _____ _           _
+             | ____| | ___  ___| |_ _ __ __ _
+             |  _| | |/ _ \/ __| __| '__/ _` |
+             | |___| |  __/ (__| |_| | | (_| |
+             |_____|_|\___|\___|\__|_|  \__,_|

infrastructure/logging/src/main/java/tech/pegasys/teku/infrastructure/logging/EventLogger.java

@@ -241,11 +241,20 @@ public void reorgEvent(
     info(reorgEventLog, Color.YELLOW);
   }
 
-  public void networkUpgradeActivated(final UInt64 nodeEpoch, final String upgradeName) {
-    info(
-        String.format(
-            "Milestone   *** Epoch: %s, Activating network upgrade: %s", nodeEpoch, upgradeName),
-        Color.GREEN);
+  public void networkUpgradeActivated(
+      final UInt64 nodeEpoch, final String upgradeName, final String banner) {
+    if (banner.isEmpty()) {
+      info(
+          String.format(
+              "Milestone   *** Epoch: %s, Activating network upgrade: %s", nodeEpoch, upgradeName),
+          Color.GREEN);
+    } else {
+      info(
+          String.format(
+              "Milestone   *** Epoch: %s, Activating network upgrade: %s\n%s\n",
+              nodeEpoch, upgradeName, banner),
+          Color.GREEN);
+    }
   }
 
   public void terminalPowBlockDetected(final Bytes32 terminalBlockHash) {