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interval.go
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interval.go
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// Copyright © 2017 Alessandro Sanino <saninoale@gmail.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package strategies
import (
"errors"
"time"
"github.com/llazzaro/golang-crypto-trading-bot/environment"
"github.com/llazzaro/golang-crypto-trading-bot/exchanges"
)
// IntervalStrategy is an interval based strategy.
type IntervalStrategy struct {
Model StrategyModel
Interval time.Duration
}
// Name returns the name of the strategy.
func (is IntervalStrategy) Name() string {
return is.Model.Name
}
// String returns a string representation of the object.
func (is IntervalStrategy) String() string {
return is.Name()
}
// Apply executes Cyclically the On Update, basing on provided interval.
func (is IntervalStrategy) Apply(wrappers []exchanges.ExchangeWrapper, markets []*environment.Market) {
var err error
hasSetupFunc := is.Model.Setup != nil
hasTearDownFunc := is.Model.TearDown != nil
hasUpdateFunc := is.Model.OnUpdate != nil
hasErrorFunc := is.Model.OnError != nil
if hasSetupFunc {
err = is.Model.Setup(wrappers, markets)
if err != nil && hasErrorFunc {
is.Model.OnError(err)
}
}
if !hasUpdateFunc {
_err := errors.New("OnUpdate func cannot be empty")
if hasErrorFunc {
is.Model.OnError(_err)
} else {
panic(_err)
}
}
for err == nil {
err = is.Model.OnUpdate(wrappers, markets)
if err != nil && hasErrorFunc {
is.Model.OnError(err)
}
time.Sleep(is.Interval)
}
if hasTearDownFunc {
err = is.Model.TearDown(wrappers, markets)
if err != nil && hasErrorFunc {
is.Model.OnError(err)
}
}
}