336a38081a
Done with: ack '2020+' -l | xargs sed -i -e 's/2020+/2021+/g' Checked manually with: git add -p Hello to future James from 2022, and Happy Hacking!
73 lines
2.6 KiB
Go
73 lines
2.6 KiB
Go
// Mgmt
|
|
// Copyright (C) 2013-2021+ James Shubin and the project contributors
|
|
// Written by James Shubin <james@shubin.ca> and the project contributors
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package autogroup
|
|
|
|
import (
|
|
"github.com/purpleidea/mgmt/pgraph"
|
|
"github.com/purpleidea/mgmt/util/errwrap"
|
|
)
|
|
|
|
// NonReachabilityGrouper is the most straight-forward algorithm for grouping.
|
|
// TODO: this algorithm may not be correct in all cases. replace if needed!
|
|
type NonReachabilityGrouper struct {
|
|
baseGrouper // "inherit" what we want, and reimplement the rest
|
|
}
|
|
|
|
// Name returns the name for the grouper algorithm.
|
|
func (ag *NonReachabilityGrouper) Name() string {
|
|
return "NonReachabilityGrouper"
|
|
}
|
|
|
|
// VertexNext iteratively finds vertex pairs with simple graph reachability...
|
|
// This algorithm relies on the observation that if there's a path from a to b,
|
|
// then they *can't* be merged (b/c of the existing dependency) so therefore we
|
|
// merge anything that *doesn't* satisfy this condition or that of the reverse!
|
|
func (ag *NonReachabilityGrouper) VertexNext() (v1, v2 pgraph.Vertex, err error) {
|
|
for {
|
|
v1, v2, err = ag.baseGrouper.VertexNext() // get all iterable pairs
|
|
if err != nil {
|
|
return nil, nil, errwrap.Wrapf(err, "error running autoGroup(vertexNext)")
|
|
}
|
|
|
|
// ignore self cmp early (perf optimization)
|
|
if v1 != v2 && v1 != nil && v2 != nil {
|
|
// if NOT reachable, they're viable...
|
|
out1, e1 := ag.graph.Reachability(v1, v2)
|
|
if e1 != nil {
|
|
return nil, nil, e1
|
|
}
|
|
out2, e2 := ag.graph.Reachability(v2, v1)
|
|
if e2 != nil {
|
|
return nil, nil, e2
|
|
}
|
|
if len(out1) == 0 && len(out2) == 0 {
|
|
return // return v1 and v2, they're viable
|
|
}
|
|
}
|
|
|
|
// if we got here, it means we're skipping over this candidate!
|
|
if ok, err := ag.baseGrouper.VertexTest(false); err != nil {
|
|
return nil, nil, errwrap.Wrapf(err, "error running autoGroup(vertexTest)")
|
|
} else if !ok {
|
|
return nil, nil, nil // done!
|
|
}
|
|
|
|
// the vertexTest passed, so loop and try with a new pair...
|
|
}
|
|
}
|