/*
* FileRepAckMirror_ConstructAndInsertMessage
* a) reserve ack shared memory
* b) construct message header
* c) calculate message body crc
* d) calculate message header crc
* e) insert message header, message header crc and message body into ack shared memory
* f) set filerep message state to 'ready' so that message can be consumed
* g) signal send ack process so message will be sent to primary immediately
*/
static int
FileRepAckMirror_ConstructAndInsertMessage(
FileRepIdentifier_u fileRepIdentifier,
FileRepRelationType_e fileRepRelationType,
FileRepOperation_e fileRepOperation,
FileRepOperationDescription_u fileRepOperationDescription,
FileRepAckState_e fileRepAckState,
uint32 messageBodyLength,
char *messageBody)
{
FileRepShmemMessageDescr_s *fileRepShmemMessageDescr = NULL;
FileRepMessageHeader_s *fileRepMessageHeader = NULL;
pg_crc32 *fileRepMessageHeaderCrc = 0;
pg_crc32 fileRepMessageHeaderCrcLocal = 0;
char *msgPositionInsert = NULL;
char *fileRepMessageBody = NULL;
uint32 msgLength = 0;
uint32 spareField = 0;
Assert(messageBodyLength == 0);
msgLength = sizeof(FileRepMessageHeader_s) + sizeof(pg_crc32) + messageBodyLength;
/*
* Shared memory is reserved in advance in order to avoid
* holding lock during memcpy() and Crc calculation...
*
* Construct FileRepShmemMessageDescr_s
*/
msgPositionInsert = FileRep_ReserveShmem(
fileRepAckShmemArray[FILEREP_OUTGOING_MESSAGE_QUEUE],
msgLength,
&spareField,
fileRepOperation,
FileRepAckShmemLock);
if (msgPositionInsert == NULL) {
ereport(WARNING,
(errmsg("mirror failure, "
"could not queue ack message to be sent to primary, "
"failover requested"),
errhint("run gprecoverseg to re-establish mirror connectivity"),
FileRep_errdetail(fileRepIdentifier,
fileRepRelationType,
fileRepOperation,
FILEREP_UNDEFINED),
FileRep_errdetail_ShmemAck(),
FileRep_errcontext()));
return STATUS_ERROR;
}
fileRepMessageHeader =
(FileRepMessageHeader_s *) (msgPositionInsert +
sizeof(FileRepShmemMessageDescr_s));
fileRepMessageHeader->fileRepMessageHeaderVersion = FileRepMessageHeaderVersionOne;
fileRepMessageHeader->fileRepRelationType = fileRepRelationType;
fileRepMessageHeader->fileRepOperation = fileRepOperation;
fileRepMessageHeader->fileRepIdentifier = fileRepIdentifier;
fileRepMessageHeader->fileRepAckState = fileRepAckState;
fileRepMessageHeader->messageCount = spareField;
fileRepMessageHeader->messageBodyLength = messageBodyLength;
if (messageBodyLength)
{
FileRep_CalculateCrc((char *) messageBody,
messageBodyLength,
&fileRepMessageHeader->fileRepMessageBodyCrc);
}
else
{
fileRepMessageHeader->fileRepMessageBodyCrc = 0;
}
switch (fileRepOperation) {
case FileRepOperationReconcileXLogEof:
case FileRepOperationValidation:
case FileRepOperationCreate:
fileRepMessageHeader->fileRepOperationDescription = fileRepOperationDescription;
break;
default:
break;
}
/*
* The following fields are not in use during fsync().
* They were zeroed during reserving message buffer.
* a) fileRepOperationDescription
* b) fileRepMessageBodyCrc
* c) messageCount
*/
fileRepMessageHeaderCrc =
(pg_crc32 *) (msgPositionInsert +
sizeof(FileRepMessageHeader_s) +
sizeof(FileRepShmemMessageDescr_s));
FileRep_CalculateCrc((char *) fileRepMessageHeader,
sizeof(FileRepMessageHeader_s),
&fileRepMessageHeaderCrcLocal);
*fileRepMessageHeaderCrc = fileRepMessageHeaderCrcLocal;
FileRep_InsertLogEntry(
"M_ConstructAndInsertMessageAck",
fileRepIdentifier,
fileRepRelationType,
fileRepOperation,
fileRepMessageHeaderCrcLocal,
FILEREP_UNDEFINED,
fileRepAckState,
FILEREP_UNDEFINED,
fileRepMessageHeader->messageCount);
if (Debug_filerep_print)
ereport(LOG,
(errmsg("M_ConstructAndInsertMessageAck construct and insert ack message "
"msg header crc '%u' message body length '%d' position insert '%p' ack state '%s' ",
fileRepMessageHeaderCrcLocal,
messageBodyLength,
msgPositionInsert,
FileRepAckStateToString[fileRepAckState]),
FileRep_errdetail(fileRepIdentifier,
fileRepRelationType,
fileRepOperation,
fileRepMessageHeader->messageCount),
FileRep_errdetail_ShmemAck(),
FileRep_errcontext()));
if (messageBodyLength)
{
fileRepMessageBody = (char *) (msgPositionInsert +
sizeof(FileRepMessageHeader_s) +
sizeof(FileRepShmemMessageDescr_s) +
sizeof(pg_crc32));
memcpy(fileRepMessageBody, messageBody, messageBodyLength);
}
fileRepShmemMessageDescr =
(FileRepShmemMessageDescr_s*) msgPositionInsert;
fileRepShmemMessageDescr->messageSync =
FileRep_IsOperationSynchronous(fileRepOperation);
fileRepShmemMessageDescr->messageState = FileRepShmemMessageStateReady;
LWLockAcquire(FileRepAckShmemLock, LW_EXCLUSIVE);
FileRep_IpcSignal(fileRepIpcArray[fileRepAckShmemArray[FILEREP_OUTGOING_MESSAGE_QUEUE]->ipcArrayIndex]->semC,
&fileRepIpcArray[fileRepAckShmemArray[FILEREP_OUTGOING_MESSAGE_QUEUE]->ipcArrayIndex]->refCountSemC);
LWLockRelease(FileRepAckShmemLock);
return STATUS_OK;
}
static int
FileRepAckPrimary_RunReceiver(void)
{
uint32_t msgLength = 0;
FileRepConsumerProcIndex_e msgType;
int status = STATUS_OK;
char *msgPositionInsert;
FileRepShmemMessageDescr_s *fileRepShmemMessageDescr;
uint32 spareField;
FileRep_InsertConfigLogEntry("run receiver");
while (1) {
FileRepSubProcess_ProcessSignals();
if (FileRepSubProcess_GetState() != FileRepStateReady &&
FileRepSubProcess_GetState() != FileRepStateInitialization) {
break;
}
if ( ! FileRepConnServer_AwaitMessageBegin()) {
/* call was interrupted ... go back to beginning to process signals */
continue;
}
status = FileRepConnServer_ReceiveMessageType(&msgType);
if (status != STATUS_OK) {
break;
}
/* DATA MESSAGE TYPE */
status = FileRepConnServer_ReceiveMessageLength(&msgLength);
if (status != STATUS_OK) {
break;
}
msgPositionInsert = FileRep_ReserveShmem(fileRepAckShmemArray[msgType],
msgLength,
/* not used */ &spareField,
FileRepOperationNotSpecified,
FileRepAckShmemLock);
if (msgPositionInsert == NULL) {
status = STATUS_ERROR;
ereport(WARNING,
(errmsg("mirror failure, "
"could not queue received ack message to be processed, "
"failover requested"),
errhint("run gprecoverseg to re-establish mirror connectivity"),
FileRep_errdetail_Shmem(),
FileRep_errdetail_ShmemAck(),
FileRep_errcontext()));
break;
}
status = FileRepConnServer_ReceiveMessageData(
msgPositionInsert + sizeof(FileRepShmemMessageDescr_s),
msgLength);
if (status != STATUS_OK) {
break;
}
SIMPLE_FAULT_INJECTOR(FileRepReceiver);
fileRepShmemMessageDescr =
(FileRepShmemMessageDescr_s*) msgPositionInsert;
/* it is not in use */
fileRepShmemMessageDescr->messageSync = FALSE;
fileRepShmemMessageDescr->messageState = FileRepShmemMessageStateReady;
LWLockAcquire(FileRepAckShmemLock, LW_EXCLUSIVE);
FileRep_IpcSignal(fileRepIpcArray[fileRepAckShmemArray[msgType]->ipcArrayIndex]->semC,
&fileRepIpcArray[fileRepAckShmemArray[msgType]->ipcArrayIndex]->refCountSemC);
LWLockRelease(FileRepAckShmemLock);
FileRep_InsertLogEntry(
"P_RunReceiver",
FileRep_GetFlatFileIdentifier("", ""),
FileRepRelationTypeNotSpecified,
FileRepOperationNotSpecified,
FILEREP_UNDEFINED,
FILEREP_UNDEFINED,
FileRepAckStateNotInitialized,
spareField,
FILEREP_UNDEFINED);
} // while(1)
FileRepConnServer_CloseConnection();
return status;
}
