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multi: remove the need for the graphsession package

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In this commit, we add a `GraphSession` method to the `ChannelGraph`.
This method provides a caller with access to a `NodeTraverser`. This is
used by pathfinding to create a graph "session" overwhich to perform a
set of queries for a pathfinding attempt. With this refactor, we hide
details such as DB transaction creation and transaction commits from the
caller. So with this, pathfinding does not need to remember to "close
the graph session". With this commit, the `graphsession` package may be
completely removed.
This commit is contained in:
Elle Mouton
2025-02-13 09:44:14 +02:00
parent dfe2314a2a
commit e004447da6
11 changed files with 117 additions and 297 deletions
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17
routing/payment_session.go
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@@ -343,19 +343,7 @@ func (p *paymentSession) RequestRoute(maxAmt, feeLimit lnwire.MilliSatoshi,
}
for {
// Get a routing graph session.
graph, closeGraph, err := p.graphSessFactory.NewGraphSession()
if err != nil {
return nil, err
}
err = findPath(graph)
// First, close routing graph session.
// NOTE: this will be removed in an upcoming commit.
if graphErr := closeGraph(); graphErr != nil {
log.Errorf("could not close graph session: %v",
graphErr)
}
err := p.graphSessFactory.GraphSession(findPath)
// If there is an error, and it is not a path finding error, we
// return it immediately.
if err != nil && !lnutils.ErrorAs[*pathFindingError](err) {
@@ -365,7 +353,8 @@ func (p *paymentSession) RequestRoute(maxAmt, feeLimit lnwire.MilliSatoshi,
// to check the underlying error.
//
//nolint:errorlint
err = err.(*pathFindingError).Unwrap()
pErr, _ := err.(*pathFindingError)
err = pErr.Unwrap()
}
// Otherwise, we'll switch on the path finding error.