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options.go
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options.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package peerlistmgr
import (
"time"
"go.uber.org/zap"
)
const (
defaultMinPeers = 3
defaultConnCheckFrequency = time.Second
defaultConnCheckTimeout = 250 * time.Millisecond
)
type options struct {
minPeers int
logger *zap.Logger
connCheckFrequency time.Duration
connCheckTimeout time.Duration
}
// Option is a function that sets some option.
type Option func(*options)
// Options is a factory for different options.
var Options = options{}
// Logger creates an Option that assigns the logger.
func (o options) Logger(logger *zap.Logger) Option {
return func(o *options) {
o.logger = logger
}
}
// MinPeers changes min number of open connections to peers that the manager will try to maintain.
func (o options) MinPeers(minPeers int) Option {
return func(o *options) {
o.minPeers = minPeers
}
}
// ConnCheckFrequency changes how frequently manager will check for MinPeers connections.
func (o options) ConnCheckFrequency(connCheckFrequency time.Duration) Option {
return func(o *options) {
o.connCheckFrequency = connCheckFrequency
}
}
// ConnCheckTimeout changes the timeout used when establishing new connections.
func (o options) ConnCheckTimeout(connCheckTimeout time.Duration) Option {
return func(o *options) {
o.connCheckTimeout = connCheckTimeout
}
}
func (o options) apply(opts ...Option) options {
ret := options{}
for _, opt := range opts {
opt(&ret)
}
if ret.logger == nil {
ret.logger = zap.NewNop()
}
if ret.minPeers <= 0 {
ret.minPeers = defaultMinPeers
}
if ret.connCheckFrequency <= 0 {
ret.connCheckFrequency = defaultConnCheckFrequency
}
if ret.connCheckTimeout <= 0 {
ret.connCheckTimeout = defaultConnCheckTimeout
}
return ret
}