github.com/uber/kraken@v0.1.4/lib/healthcheck/passive.go (about)

     1  // Copyright (c) 2016-2019 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  package healthcheck
    15  
    16  import (
    17  	"github.com/uber/kraken/lib/hostlist"
    18  	"github.com/uber/kraken/utils/stringset"
    19  )
    20  
    21  // Passive wraps a passive health check and can be used as a hostlist.List. See
    22  // PassiveFilter for passive health check documenation.
    23  type Passive struct {
    24  	hosts  hostlist.List
    25  	filter PassiveFilter
    26  }
    27  
    28  // NewPassive returns a new Passive.
    29  func NewPassive(hosts hostlist.List, filter PassiveFilter) *Passive {
    30  	return &Passive{hosts, filter}
    31  }
    32  
    33  // Resolve returns the latest healthy hosts. If all hosts are unhealthy, returns
    34  // all hosts.
    35  func (p *Passive) Resolve() stringset.Set {
    36  	all := p.hosts.Resolve()
    37  	healthy := p.filter.Run(all)
    38  	if len(healthy) == 0 {
    39  		return all
    40  	}
    41  	return healthy
    42  }
    43  
    44  // Failed marks a request to addr as failed.
    45  func (p *Passive) Failed(addr string) {
    46  	p.filter.Failed(addr)
    47  }