/
config.go
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/
config.go
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// Copyright (c) 2016-2019 Uber Technologies, 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 dispatch
import (
"math"
"time"
"github.com/uber/kraken/lib/torrent/scheduler/dispatch/piecerequest"
"github.com/uber/kraken/utils/memsize"
"github.com/uber/kraken/utils/timeutil"
)
// Config defines the configuration for piece dispatch.
type Config struct {
// PieceRequestMinTimeout is the minimum timeout for all piece requests, regardless of
// size.
PieceRequestMinTimeout time.Duration `yaml:"piece_request_min_timeout"`
// PieceRequestTimeoutPerMb is the duration that will be added to piece request
// timeouts based on the piece size (in megabytes).
PieceRequestTimeoutPerMb time.Duration `yaml:"piece_request_timeout_per_mb"`
// PieceRequestPolicy is the policy that is used to decide which pieces to request
// from a peer.
PieceRequestPolicy string `yaml:"piece_request_policy"`
// PipelineLimit limits the total number of requests can be sent to a peer
// at the same time.
PipelineLimit int `yaml:"pipeline_limit"`
// EndgameThreshold is the number pieces required to complete the torrent
// before the torrent enters "endgame", where we start overloading piece
// requests to multiple peers.
EndgameThreshold int `yaml:"endgame_threshold"`
DisableEndgame bool `yaml:"disable_endgame"`
}
func (c Config) applyDefaults() Config {
if c.PieceRequestPolicy == "" {
c.PieceRequestPolicy = piecerequest.DefaultPolicy
}
if c.PieceRequestMinTimeout == 0 {
c.PieceRequestMinTimeout = 4 * time.Second
}
if c.PieceRequestTimeoutPerMb == 0 {
c.PieceRequestTimeoutPerMb = 4 * time.Second
}
if c.PipelineLimit == 0 {
c.PipelineLimit = 3
}
if c.EndgameThreshold == 0 {
c.EndgameThreshold = c.PipelineLimit
}
return c
}
func (c Config) calcPieceRequestTimeout(maxPieceLength int64) time.Duration {
n := float64(c.PieceRequestTimeoutPerMb) * float64(maxPieceLength) / float64(memsize.MB)
d := time.Duration(math.Ceil(n))
return timeutil.MaxDuration(d, c.PieceRequestMinTimeout)
}