refactor: renaming, reuse

lib/index.js

@@ -439,42 +439,15 @@ function initDict(peer, config) {
     if (ghostableMsgID === tangleID) return false
 
     assertDBPlugin(peer)
-    const tangle = peer.db.getTangle(tangleID)
     const msg = peer.db.get(ghostableMsgID)
 
-    // prettier-ignore
-    if (!tangle || tangle.size === 0) throw new Error(`isGhostable() tangleID "${tangleID}" is empty`)
     // prettier-ignore
     if (!msg) throw new Error(`isGhostable() msgID "${ghostableMsgID}" does not exist in the database`)
-    // prettier-ignore
-    if (!isValidDictMoot(tangle.root)) throw new Error(`isGhostable() tangleID "${tangleID}" is not a dict`)
-
-    // Discover field roots
-    const fieldRootIDs = new Set()
-    const msgIDs = tangle.topoSort()
-    for (const msgID of msgIDs) {
-      const msg = peer.db.get(msgID)
-      if (!msg?.data) continue
-      for (const supersededMsgID of msg.data.supersedes) {
-        fieldRootIDs.delete(supersededMsgID)
-      }
-      fieldRootIDs.add(msgID)
-    }
-
-    // Get minimum depth of all field roots
-    let minFieldRootDepth = Infinity
-    for (const fieldRootID of fieldRootIDs) {
-      const depth = tangle.getDepth(fieldRootID)
-      if (depth < minFieldRootDepth) minFieldRootDepth = depth
-      // field roots are not ghostables
-      if (fieldRootID === ghostableMsgID) return false
-      // msgs suceeding field roots are not ghostables
-      if (tangle.precedes(fieldRootID, ghostableMsgID)) return false
-    }
 
+    const minFieldRootDepth = minRequiredDepth(tangleID)
     const minGhostDepth = minFieldRootDepth - ghostSpan
-    const ghostableMsgDepth = msg.metadata.tangles[tangleID].depth
+    const msgDepth = msg.metadata.tangles[tangleID].depth
-    if (ghostableMsgDepth >= minGhostDepth) return true
+    if (minGhostDepth <= msgDepth && msgDepth < minFieldRootDepth) return true
     return false
   }