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invariantManager.go
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invariantManager.go
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// The MIT License (MIT)
//
// Copyright (c) 2017-2020 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 invariant
import "context"
type (
invariantManager struct {
invariants []Invariant
}
)
// NewInvariantManager handles running a collection of invariants according to the invariant collection provided.
func NewInvariantManager(
invariants []Invariant,
) Manager {
return &invariantManager{
invariants: invariants,
}
}
// RunChecks runs all enabled checks.
func (i *invariantManager) RunChecks(
ctx context.Context,
execution interface{},
) ManagerCheckResult {
result := ManagerCheckResult{
CheckResultType: CheckResultTypeHealthy,
DeterminingInvariantType: nil,
CheckResults: nil,
}
for _, iv := range i.invariants {
checkResult := iv.Check(ctx, execution)
result.CheckResults = append(result.CheckResults, checkResult)
checkResultType, updated := i.nextCheckResultType(result.CheckResultType, checkResult.CheckResultType)
result.CheckResultType = checkResultType
if updated {
result.DeterminingInvariantType = &checkResult.InvariantName
}
}
return result
}
// RunFixes runs all enabled fixes.
func (i *invariantManager) RunFixes(
ctx context.Context,
execution interface{}) ManagerFixResult {
result := ManagerFixResult{
FixResultType: FixResultTypeSkipped,
DeterminingInvariantName: nil,
FixResults: nil,
}
for _, iv := range i.invariants {
fixResult := iv.Fix(ctx, execution)
result.FixResults = append(result.FixResults, fixResult)
fixResultType, updated := i.nextFixResultType(result.FixResultType, fixResult.FixResultType)
result.FixResultType = fixResultType
if updated {
result.DeterminingInvariantName = &fixResult.InvariantName
}
}
return result
}
func (i *invariantManager) nextFixResultType(
currentState FixResultType,
event FixResultType,
) (FixResultType, bool) {
switch currentState {
case FixResultTypeSkipped:
return event, event != FixResultTypeSkipped
case FixResultTypeFixed:
if event == FixResultTypeFailed {
return event, true
}
return currentState, false
case FixResultTypeFailed:
return currentState, false
default:
panic("unknown FixResultType")
}
}
func (i *invariantManager) nextCheckResultType(
currentState CheckResultType,
event CheckResultType,
) (CheckResultType, bool) {
switch currentState {
case CheckResultTypeHealthy:
return event, event != CheckResultTypeHealthy
case CheckResultTypeCorrupted:
if event == CheckResultTypeFailed {
return event, true
}
return currentState, false
case CheckResultTypeFailed:
return currentState, false
default:
panic("unknown CheckResultType")
}
}