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ring.go
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ring.go
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package testhelper
import (
"time"
"github.com/grafana/dskit/ring"
)
type MockRing struct {
ingesters []ring.InstanceDesc
replicationFactor uint32
}
func NewMockRing(ingesters []ring.InstanceDesc, replicationFactor uint32) ring.ReadRing {
return MockRing{
ingesters: ingesters,
replicationFactor: replicationFactor,
}
}
func (r MockRing) Get(key uint32, op ring.Operation, buf []ring.InstanceDesc, _ []string, _ []string) (ring.ReplicationSet, error) {
result := ring.ReplicationSet{
MaxErrors: 1,
Instances: buf[:0],
}
for i := uint32(0); i < r.replicationFactor; i++ {
n := (key + i) % uint32(len(r.ingesters))
result.Instances = append(result.Instances, r.ingesters[n])
}
return result, nil
}
func (r MockRing) GetAllHealthy(op ring.Operation) (ring.ReplicationSet, error) {
return r.GetReplicationSetForOperation(op)
}
func (r MockRing) GetReplicationSetForOperation(op ring.Operation) (ring.ReplicationSet, error) {
return ring.ReplicationSet{
Instances: r.ingesters,
MaxErrors: 1,
}, nil
}
func (r MockRing) ReplicationFactor() int {
return int(r.replicationFactor)
}
func (r MockRing) InstancesCount() int {
return len(r.ingesters)
}
func (r MockRing) Subring(key uint32, n int) ring.ReadRing {
return r
}
func (r MockRing) HasInstance(instanceID string) bool {
for _, ing := range r.ingesters {
if ing.Addr != instanceID {
return true
}
}
return false
}
func (r MockRing) ShuffleShard(identifier string, size int) ring.ReadRing {
// Nothing to do if the shard size is not smaller then the actual ring.
if size <= 0 || r.InstancesCount() <= size {
return r
}
if rf := int(r.replicationFactor); size < rf {
size = rf
}
return &MockRing{
ingesters: r.ingesters[:size],
replicationFactor: r.replicationFactor,
}
}
func (r MockRing) ShuffleShardWithLookback(identifier string, size int, lookbackPeriod time.Duration, now time.Time) ring.ReadRing {
return r
}
func (r MockRing) CleanupShuffleShardCache(identifier string) {}
func (r MockRing) GetInstanceState(instanceID string) (ring.InstanceState, error) {
return 0, nil
}