Fix #51, remove mid draft

fsw/src/ds_app.c

@@ -469,6 +469,13 @@ void DS_AppProcessCmd(const CFE_SB_Buffer_t *BufPtr)
             DS_CmdAddMID(BufPtr);
             break;
 
+        /*
+        ** Remove message ID from filter table...
+        */
+        case DS_REMOVE_MID_CC:
+            DS_CmdRemoveMID(BufPtr);
+            break;
+
         /*
         ** Close all destination files (next packet will re-open)...
         */

fsw/src/ds_cmds.c

@@ -1442,6 +1442,92 @@ void DS_CmdAddMID(const CFE_SB_Buffer_t *BufPtr)
     }
 } /* End of DS_CmdAddMID() */
 
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+/*                                                                 */
+/* DS_CmdRemoveMID() - remove message ID from packet filter table  */
+/*                                                                 */
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void DS_CmdRemoveMID(const CFE_SB_Buffer_t *BufPtr)
+{
+    DS_RemoveMidCmd_t *DS_RemoveMidCmd  = (DS_RemoveMidCmd_t *)BufPtr;
+    size_t             ActualLength     = 0;
+    size_t             ExpectedLength   = sizeof(DS_RemoveMidCmd_t);
+    DS_PacketEntry_t * pPacketEntry     = NULL;
+    int32              FilterTableIndex = 0;
+    int32              HashTableIndex   = 0;
+
+    if (ExpectedLength != ActualLength)
+    {
+        /*
+        ** Invalid command packet length...
+        */
+        DS_AppData.CmdRejectedCounter++;
+
+        CFE_EVS_SendEvent(DS_REMOVE_MID_CMD_ERR_EID, CFE_EVS_EventType_ERROR,
+                          "Invalid REMOVE MID command length: expected = %d, actual = %d", (int)ExpectedLength,
+                          (int)ActualLength);
+    }
+    else if (!CFE_SB_IsValidMsgId(DS_RemoveMidCmd->MessageID))
+    {
+        /*
+        ** Invalid packet message ID - can be anything but unused...
+        */
+        DS_AppData.CmdRejectedCounter++;
+
+        CFE_EVS_SendEvent(DS_REMOVE_MID_CMD_ERR_EID, CFE_EVS_EventType_ERROR,
+                          "Invalid REMOVE MID command arg: invalid MID = 0x%08lX",
+                          (unsigned long)CFE_SB_MsgIdToValue(DS_RemoveMidCmd->MessageID));
+    }
+    else if (DS_AppData.FilterTblPtr == (DS_FilterTable_t *)NULL)
+    {
+        /*
+        ** Must have a valid packet filter table loaded...
+        */
+        DS_AppData.CmdRejectedCounter++;
+
+        CFE_EVS_SendEvent(DS_REMOVE_MID_CMD_ERR_EID, CFE_EVS_EventType_ERROR,
+                          "Invalid REMOVE MID command: filter table is not loaded");
+    }
+    else if ((FilterTableIndex = DS_TableFindMsgID(DS_RemoveMidCmd->MessageID)) == DS_INDEX_NONE)
+    {
+        /*
+        ** Message ID is not in packet filter table...
+        */
+        DS_AppData.CmdRejectedCounter++;
+
+        CFE_EVS_SendEvent(DS_REMOVE_MID_CMD_ERR_EID, CFE_EVS_EventType_ERROR,
+                          "Invalid REMOVE MID command: MID = 0x%08lX is not in filter table",
+                          (unsigned long)CFE_SB_MsgIdToValue(DS_RemoveMidCmd->MessageID));
+    }
+    else
+    {
+        /*
+        ** Free used packet filter entry for used message ID...
+        */
+        pPacketEntry = &DS_AppData.FilterTblPtr->Packet[FilterTableIndex];
+
+        free(pPacketEntry);
+
+        /* Remove the message ID from the hash table as well */
+        HashTableIndex = DS_TableRemoveMsgID(DS_RemoveMidCmd->MessageID, FilterTableIndex);
+
+        CFE_SB_Unsubscribe(DS_RemoveMidCmd->MessageID, DS_AppData.InputPipe);
+
+        /*
+        ** Notify cFE that we have modified the table data...
+        */
+        CFE_TBL_Modified(DS_AppData.FilterTblHandle);
+
+        DS_AppData.CmdAcceptedCounter++;
+
+        CFE_EVS_SendEvent(DS_REMOVE_MID_CMD_EID, CFE_EVS_EventType_DEBUG,
+                          "REMOVE MID command: MID = 0x%08lX, filter index = %d, hash index = %d",
+                          (unsigned long)CFE_SB_MsgIdToValue(DS_RemoveMidCmd->MessageID), (int)FilterTableIndex,
+                          (int)HashTableIndex);
+    }
+} /* End of DS_CmdRemoveMID() */
+
 /************************/
 /*  End of File Comment */
 /************************/

fsw/src/ds_cmds.h

@@ -444,4 +444,27 @@ void DS_CmdGetFileInfo(const CFE_SB_Buffer_t *BufPtr);
  */
 void DS_CmdAddMID(const CFE_SB_Buffer_t *BufPtr);
 
+/**
+ *  \brief Remove Message ID from Packet Filter Table
+ *
+ *  \par Description
+ *       Remove used packet filter table entry
+ *       Reject invalid commands
+ *       - generate error event if invalid command packet length
+ *       - generate error event if MID argument is invalid (cannot be zero)
+ *       - generate error event if packet filter table is not loaded
+ *       - generate error event if MID is already in packet filter table
+ *       - generate error event if no unused packet filter table entries
+ *       Accept valid commands
+ *       - generate success event (event type = debug)
+ *
+ *  \par Assumptions, External Events, and Notes:
+ *       (none)
+ *
+ *  \param[in] BufPtr Software Bus message pointer
+ *
+ *  \sa #DS_REMOVE_MID_CC, #DS_RemoveMidCmd_t
+ */
+void DS_CmdRemoveMID(const CFE_SB_Buffer_t *BufPtr);
+
 #endif

fsw/src/ds_events.h

@@ -787,6 +787,40 @@
  */
 #define DS_ADD_MID_CMD_ERR_EID 65
 
+/**
+ *  \brief DS Remove Message ID from Filter Table Command Event ID
+ *
+ *  \par Type: DEBUG
+ *
+ *  \par Cause:
+ *
+ *  This event signals the successful execution of a command to remove
+ *  a message ID from the Packet Filter Table.
+ *
+ *  The Packet Filter Table must be loaded and have a used entry
+ *  for removing the message ID.  The message ID must not be zero
+ *  be and must already exist in the table.
+ */
+#define DS_REMOVE_MID_CMD_EID 66
+
+/**
+ *  \brief DS Remove Message ID from Filter Table Command Invalid Event ID
+ *
+ *  \par Type: ERROR
+ *
+ *  \par Cause:
+ *
+ *  This event signals the failed execution of a command to remove a
+ *  message ID from the Packet Filter Table.  The cause of the failure
+ *  may be an invalid command packet length or an invalid message ID.
+ *
+ *  The failure may also result from not having a Packet Filter Table
+ *  loaded at the time the command was invoked.  The loaded table
+ *  must have an unused entry available for the new message ID and
+ *  must not already contain the new message ID.
+ */
+#define DS_REMOVE_MID_CMD_ERR_EID 67
+
 /**
  *  \brief DS Close All Destination Files Command Event ID
  *
@@ -799,7 +833,7 @@
  *
  *  This command will succeed regardless of whether there was an open file.
  */
-#define DS_CLOSE_ALL_CMD_EID 66
+#define DS_CLOSE_ALL_CMD_EID 68
 
 /**
  *  \brief DS Close All Destination Files Command Invalid Event ID
@@ -812,7 +846,7 @@
  *  all open Destination Files.  The cause of the failure can only
  *  be an invalid command packet length.
  */
-#define DS_CLOSE_ALL_CMD_ERR_EID 67
+#define DS_CLOSE_ALL_CMD_ERR_EID 69
 
 /**
  *  \brief DS File Create Invalid Name Event ID
@@ -824,7 +858,7 @@
  *  This event is generated when DS_FileCreateName is invoked with an
  *  empty path name.
  */
-#define DS_FILE_CREATE_EMPTY_PATH_ERR_EID 68
+#define DS_FILE_CREATE_EMPTY_PATH_ERR_EID 70
 
 /**
  * \brief DS Filter Table Name Invalid Event ID
@@ -836,7 +870,7 @@
  * This event is issued when an invalid filter table name is passed to
  * the CFE_TBL_GetInfo.
  */
-#define DS_APPHK_FILTER_TBL_ERR_EID 69
+#define DS_APPHK_FILTER_TBL_ERR_EID 71
 
 /**
  * \brief DS Filter Table Name Create Failed Event ID
@@ -848,7 +882,7 @@
  * This event is issued when the filter table name is not successfully
  * created (via snprintf) in the DS_AppProcessHK function.
  */
-#define DS_APPHK_FILTER_TBL_PRINT_ERR_EID 70
+#define DS_APPHK_FILTER_TBL_PRINT_ERR_EID 72
 
 /**@}*/
 

fsw/src/ds_msg.h

@@ -293,6 +293,19 @@ typedef struct
 
 } DS_AddMidCmd_t;
 
+/**
+ *  \brief Remove Message ID from Packet Filter Table
+ *
+ *  For command details see #DS_REMOVE_MID_CC
+ */
+typedef struct
+{
+    CFE_MSG_CommandHeader_t CmdHeader; /**< \brief cFE Software Bus command message header */
+
+    CFE_SB_MsgId_t MessageID; /**< \brief Message ID to add to Packet Filter Table */
+
+} DS_RemoveMidCmd_t;
+
 /**\}*/
 
 /**

fsw/src/ds_msgdefs.h

@@ -549,6 +549,38 @@
  */
 #define DS_ADD_MID_CC 16
 
+/**
+ * \brief Remove Message ID from Packet Filter Table
+ *
+ *  \par Description
+ *       This command will change the Message ID selection for an
+ *       unused Packet Filter Table entry to the indicated value.
+ *
+ *  \par Command Structure
+ *       #DS_RemoveMidCmd_t
+ *
+ *  \par Command Verification
+ *       Evidence of success may be found in the following telemetry:
+ *       - #DS_HkPacket_t.CmdAcceptedCounter will increment
+ *       - The #DS_ADD_MID_CMD_EID debug event message will be sent
+ *
+ *  \par Error Conditions
+ *       This command can fail for the following reasons:
+ *       - Invalid command packet length
+ *       - Message ID is invalid (can be anything but zero)
+ *       - Packet filter table is not currently loaded
+ *       - Message ID already exists in packet filter table
+ *       - All packet filter table entries are already in use
+ *
+ *       Evidence of failure may be found in the following telemetry:
+ *       - #DS_HkPacket_t.CmdRejectedCounter will increment
+ *       - The #DS_ADD_MID_CMD_ERR_EID error event message will be sent
+ *
+ *  \par Criticality
+ *       None
+ */
+#define DS_REMOVE_MID_CC 17
+
 /**
  * \brief Close All Destination Files
  *
@@ -577,7 +609,7 @@
  *  \par Criticality
  *       None
  */
-#define DS_CLOSE_ALL_CC 17
+#define DS_CLOSE_ALL_CC 18
 
 /**\}*/
 

fsw/src/ds_table.c

@@ -1109,6 +1109,58 @@ int32 DS_TableAddMsgID(CFE_SB_MsgId_t MessageID, int32 FilterIndex)
 
 } /* End of DS_TableAddMsgID() */
 
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+/*                                                                 */
+/* DS_TableRemoveMsgID() - get hash table index for MID             */
+/*                                                                 */
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+int32 DS_TableRemoveMsgID(CFE_SB_MsgId_t MessageID, int32 FilterIndex)
+{
+    int32          HashIndex  = 0;
+    DS_HashLink_t *RemoveLink = NULL;
+    DS_HashLink_t *LinkList   = NULL;
+    DS_HashLink_t *PrevLink   = NULL;
+
+    /* Get used linked list entry (one link entry per filter table entry) */
+    RemoveLink = &DS_AppData.HashLinks[FilterIndex];
+
+    /* Hash table function converts MID into hash table index */
+    HashIndex = DS_TableHashFunction(RemoveLink->MessageID);
+
+    if (DS_AppData.HashTable[HashIndex]->Index == RemoveLink->Index)
+    {
+        /* Remove first link in this hash table entry linked list */
+        free(RemoveLink);
+    }
+    else
+    {
+        /*
+        ** Get start of linked list (all MID's with same hash result)
+        ** Keep track of previous link as we need need to change 'PrevLink->Next'
+        */
+        /* Get start of linked list (all MID's with same hash result) */
+        PrevLink = DS_AppData.HashTable[HashIndex];
+
+        LinkList = DS_AppData.HashTable[HashIndex]->Next;
+
+        /* Find link to remove */
+        while (LinkList->Index != RemoveLink->Index)
+        {
+            PrevLink = LinkList;
+            LinkList = LinkList->Next;
+        }
+
+        /* Remove link */
+        PrevLink->Next = LinkList->Next;
+
+        free(LinkList);
+    }
+
+    return (HashIndex);
+
+} /* End of DS_TableRemoveMsgID() */
+
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 /*                                                                 */
 /* DS_TableFindMsgID() - get filter table index for MID            */

fsw/src/ds_table.h

@@ -613,6 +613,27 @@ void DS_TableCreateHash(void);
  */
 int32 DS_TableAddMsgID(CFE_SB_MsgId_t MessageID, int32 FilterIndex);
 
+/**
+ *  \brief Removes a message ID from the hash table
+ *
+ *  \par Description
+ *       This function removes a message ID from the hash table
+ *
+ *  \par Called From:
+ *       - Command to remove a MID
+ *
+ *  \par Assumptions, External Events, and Notes:
+ *       (none)
+ *
+ *  \param[in] MessageID   Message ID
+ *  \param[in] FilterIndex Filter table index for message ID
+ *
+ *  \return Hash table index for message ID
+ *
+ *  \sa #DS_HashLink_t, #DS_TableHashFunction, #DS_TableFindMsgID
+ */
+int32 DS_TableRemoveMsgID(CFE_SB_MsgId_t MessageID, int32 FilterIndex);
+
 /**
  *  \brief Search packet filter table for message ID
  *

unit-test/stubs/ds_cmds_stubs.c

@@ -279,6 +279,19 @@ void DS_CmdAddMID(const CFE_SB_Buffer_t *BufPtr)
 
 } /* End of DS_CmdAddMID() */
 
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+/*                                                                 */
+/* DS_CmdRemoveMID() - remove message ID from packet filter table  */
+/*                                                                 */
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+void DS_CmdRemoveMID(const CFE_SB_Buffer_t *BufPtr)
+{
+    UT_Stub_RegisterContextGenericArg(UT_KEY(DS_CmdRemoveMID), BufPtr);
+    UT_DEFAULT_IMPL(DS_CmdRemoveMID);
+
+} /* End of DS_CmdRemoveMID() */
+
 /************************/
 /*  End of File Comment */
 /************************/