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Basic voting

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This commit is contained in:
Ian Barwick
2017-06-29 01:11:21 +09:00
parent d6b6255144
commit fa86fe4ad8
6 changed files with 121 additions and 20 deletions
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27
repmgr.c
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@@ -64,6 +64,8 @@ PG_FUNCTION_INFO_V1(request_vote);
Datum get_voting_status(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(get_voting_status);
Datum set_voting_status_initiated(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(set_voting_status_initiated);
/*
* Module load callback
@@ -155,6 +157,16 @@ request_vote(PG_FUNCTION_ARGS)
int lsn_diff;
NodeVotingStatus voting_status;
LWLockAcquire(shared_state->lock, LW_SHARED);
voting_status = shared_state->voting_status;
LWLockRelease(shared_state->lock);
/* this node has initiated voting or already responded to another node */
if (voting_status != VS_NO_VOTE)
PG_RETURN_NULL();
elog(INFO, "id is %i, lsn: %X/%X",
requesting_node_id,
(uint32) (requesting_node_last_lsn >> 32),
@@ -182,6 +194,11 @@ request_vote(PG_FUNCTION_ARGS)
SPI_finish();
/* indicate this node has responded to a vote request */
LWLockAcquire(shared_state->lock, LW_SHARED);
shared_state->voting_status = VS_VOTE_REQUEST_RECEIVED;
LWLockRelease(shared_state->lock);
PG_RETURN_INT32(lsn_diff);
}
@@ -198,3 +215,13 @@ get_voting_status(PG_FUNCTION_ARGS)
PG_RETURN_INT32(voting_status);
}
Datum
set_voting_status_initiated(PG_FUNCTION_ARGS)
{
LWLockAcquire(shared_state->lock, LW_SHARED);
shared_state->voting_status = VS_VOTE_INITIATED;
LWLockRelease(shared_state->lock);
PG_RETURN_VOID();
}