forked from livekit/livekit
/
sysload.go
53 lines (46 loc) · 1.49 KB
/
sysload.go
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// Copyright 2023 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package selector
import (
"github.com/livekit/protocol/livekit"
)
// SystemLoadSelector eliminates nodes that surpass has a per-cpu node higher than SysloadLimit
// then selects a node from nodes that are not overloaded
type SystemLoadSelector struct {
SysloadLimit float32
SortBy string
}
func (s *SystemLoadSelector) filterNodes(nodes []*livekit.Node) ([]*livekit.Node, error) {
nodes = GetAvailableNodes(nodes)
if len(nodes) == 0 {
return nil, ErrNoAvailableNodes
}
nodesLowLoad := make([]*livekit.Node, 0)
for _, node := range nodes {
if GetNodeSysload(node) < s.SysloadLimit {
nodesLowLoad = append(nodesLowLoad, node)
}
}
if len(nodesLowLoad) > 0 {
nodes = nodesLowLoad
}
return nodes, nil
}
func (s *SystemLoadSelector) SelectNode(nodes []*livekit.Node) (*livekit.Node, error) {
nodes, err := s.filterNodes(nodes)
if err != nil {
return nil, err
}
return SelectSortedNode(nodes, s.SortBy)
}