Hooks for appending ancients, initial work on block update plugin

core/rawdb/freezer.go

@@ -218,6 +218,7 @@ func (f *freezer) AppendAncient(number uint64, hash, header, body, receipts, td
 			log.Info("Append ancient failed", "number", number, "err", err)
 		}
 	}()
+	pluginAppendAncient(number, hash, header, body, receipts, td)
 	// Inject all the components into the relevant data tables
 	if err := f.tables[freezerHashTable].Append(f.frozen, hash[:]); err != nil {
 		log.Error("Failed to append ancient hash", "number", f.frozen, "hash", hash, "err", err)

core/rawdb/plugin_hooks.go

@@ -0,0 +1,26 @@
+package rawdb
+
+
+import (
+  "github.com/ethereum/go-ethereum/plugins"
+  "github.com/ethereum/go-ethereum/log"
+)
+
+func PluginAppendAncient(pl *plugins.PluginLoader, number uint64, hash, header, body, receipts, td []byte) {
+  fnList := pl.Lookup("AppendAncient", func(item interface{}) bool {
+    _, ok := item.(func(number uint64, hash, header, body, receipts, td []byte))
+    return ok
+  })
+  for _, fni := range fnList {
+    if fn, ok := fni.(func(number uint64, hash, header, body, receipts, td []byte)); ok {
+      fn(number, hash, header, body, receipts, td)
+    }
+  }
+}
+func pluginAppendAncient(number uint64, hash, header, body, receipts, td []byte) {
+  if plugins.DefaultPluginLoader == nil {
+		log.Warn("Attempting AppendAncient, but default PluginLoader has not been initialized")
+    return
+  }
+  PluginAppendAncient(plugins.DefaultPluginLoader, number, hash, header, body, receipts, td)
+}