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rollout.go
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rollout.go
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// Copyright 2022 Google LLC
//
// 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 controller
import (
"time"
)
// rolloutProcessor computes strategies for rolling out application versions.
type rolloutProcessor interface {
// computeRolloutStrategy returns a new rolloutStrategy for an application
// version, given the rollout properties.
computeRolloutStrategy(props rolloutProperties) (*RolloutStrategy, error)
}
// rolloutProperties describes properties for the rollout of an application version.
type rolloutProperties struct {
// The expected duration for the rollout, and specified by the user.
//
// Note that we make the best effort to rollout the application version in
// this time period, but we do not guarantee it (e.g., due to rollout errors).
durationHint time.Duration
// The fraction of time to wait and validate whether the rollout was successful.
//
// It is a fraction of the durationHint and takes values between [0, 1).
waitTimeFrac float64
// The expected maximum delay from when the traffic is applied to when it
// takes effect.
actuationDelay time.Duration
// List of rollout locations (e.g., cloud regions), as specified by the user.
locations []string
}