github.com/uber/kraken@v0.1.4/tracker/peerhandoutpolicy/completeness_policy.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 peerhandoutpolicy
    15  
    16  import "github.com/uber/kraken/core"
    17  
    18  const _completenessPolicy = "completeness"
    19  
    20  // completenessAssignmentPolicy assigns priorities based on download completeness.
    21  // Peers who've completed downloading are highest, then origins, then other peers.
    22  type completenessAssignmentPolicy struct{}
    23  
    24  func newCompletenessAssignmentPolicy() assignmentPolicy {
    25  	return &completenessAssignmentPolicy{}
    26  }
    27  
    28  func (p *completenessAssignmentPolicy) assignPriority(peer *core.PeerInfo) (int, string) {
    29  	if peer.Origin {
    30  		return 1, "origin"
    31  	}
    32  	if peer.Complete {
    33  		return 0, "peer_seeder"
    34  	}
    35  	return 2, "peer_incomplete"
    36  }