Recover from invalid parameter name faults

A fault can happen if a parameter no longer exists. This code attempts
to recover from the fault by refreshing the relavent parameters.

lib/session.js

@@ -2552,8 +2552,39 @@ function rpcResponse(sessionContext, id, rpcRes, callback) {
 }
 
 function rpcFault(sessionContext, id, faultResponse, callback) {
-  // TODO Consider handling invalid parameter faults by automatically refreshing
-  // relevant data model portions
+  const rpcReq = sessionContext.rpcRequest;
+  delete sessionContext.syncState;
+  delete sessionContext.rpcRequest;
+
+  // Recover from invalid parameter name faults
+  if (faultResponse.detail.faultCode === "9005") {
+    const timestamp = sessionContext.timestamp + sessionContext.iteration;
+    let toClear;
+    if (rpcReq.name === "GetParameterNames") {
+      if (rpcReq.parameterPath) {
+        toClear = [
+          [rpcReq.parameterPath.replace(/\.$/, "").split("."), timestamp]
+        ];
+      }
+    } else if (rpcReq.name === "GetParameterValues") {
+      toClear = rpcReq.parameterNames.map(p => [
+        p.replace(/\.$/, "").split("."),
+        timestamp
+      ]);
+    } else if (rpcReq.name === "SetParameterValues") {
+      toClear = rpcReq.parameterList.map(p => [
+        p[0].replace(/\.$/, "").split("."),
+        timestamp
+      ]);
+    } else if (rpcReq.name === "AddObject") {
+      toClear = [[rpcReq.objectName.replace(/\.$/, "").split("."), timestamp]];
+    } else if (rpcReq.name === "DeleteObject") {
+      toClear = [[rpcReq.objectName.replace(/\.$/, "").split("."), timestamp]];
+    }
+
+    if (toClear) return void clear(sessionContext, toClear, callback);
+  }
+
   const fault = {
     code: `cwmp.${faultResponse.detail.faultCode}`,
     message: faultResponse.detail.faultString,
@@ -2561,7 +2592,6 @@ function rpcFault(sessionContext, id, faultResponse, callback) {
     timestamp: sessionContext.timestamp
   };
 
-  delete sessionContext.syncState;
   callback(null, fault);
 }