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staged_policy.go
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/
staged_policy.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 policy
import (
"encoding/json"
"fmt"
)
var (
// DefaultStagedPolicies represents a default staged policies.
DefaultStagedPolicies StagedPolicies
// DefaultPoliciesList represents a default policies list.
DefaultPoliciesList = PoliciesList{DefaultStagedPolicies}
)
// StagedPolicies represent a list of policies at a specified version.
type StagedPolicies struct {
// Cutover is when the policies take effect.
CutoverNanos int64
// Tombstoned determines whether the associated (rollup) metric has been tombstoned.
Tombstoned bool
// policies represent the list of policies.
policies []Policy
}
// NewStagedPolicies create a new staged policies.
func NewStagedPolicies(cutoverNanos int64, tombstoned bool, policies []Policy) StagedPolicies {
return StagedPolicies{CutoverNanos: cutoverNanos, Tombstoned: tombstoned, policies: policies}
}
// Reset resets the staged policies.
func (p *StagedPolicies) Reset() { *p = DefaultStagedPolicies }
// IsDefault returns whether this is a default staged policies.
func (p StagedPolicies) IsDefault() bool {
return p.CutoverNanos == 0 && !p.Tombstoned && p.hasDefaultPolicies()
}
// Policies returns the policies and whether the policies are the default policies.
func (p StagedPolicies) Policies() ([]Policy, bool) {
return p.policies, p.hasDefaultPolicies()
}
// Equals returns whether two staged policies are equal.
func (p StagedPolicies) Equals(other StagedPolicies) bool {
if p.CutoverNanos != other.CutoverNanos || p.Tombstoned != other.Tombstoned {
return false
}
currPolicies, currIsDefault := p.Policies()
otherPolicies, otherIsDefault := other.Policies()
if currIsDefault && otherIsDefault {
return true
}
if currIsDefault || otherIsDefault {
return false
}
if len(currPolicies) != len(otherPolicies) {
return false
}
for i := 0; i < len(currPolicies); i++ {
if currPolicies[i] != otherPolicies[i] {
return false
}
}
return true
}
// String is the representation of staged policies.
func (p StagedPolicies) String() string {
b, err := json.Marshal(p)
if err != nil {
return fmt.Sprintf("[invalid staged policies: %v]", err)
}
return string(b)
}
func (p StagedPolicies) hasDefaultPolicies() bool {
return IsDefaultPolicies(p.policies)
}
// MarshalJSON returns the JSON encoding of staged policies.
func (p StagedPolicies) MarshalJSON() ([]byte, error) {
return json.Marshal(newStagedPoliciesJSON(p))
}
// UnmarshalJSON unmarshals JSON-encoded data into staged policies.
func (p *StagedPolicies) UnmarshalJSON(data []byte) error {
var spj stagedPoliciesJSON
err := json.Unmarshal(data, &spj)
if err != nil {
return err
}
*p = spj.StagedPolicies()
return nil
}
// stagedPoliciesJSON is used for marshaling and unmarshaling staged policies.
type stagedPoliciesJSON struct {
CutoverNanos int64 `json:"cutoverNanos"`
Tombstoned bool `json:"tombstoned"`
Policies []Policy `json:"policies"`
}
func newStagedPoliciesJSON(sp StagedPolicies) stagedPoliciesJSON {
return stagedPoliciesJSON{
CutoverNanos: sp.CutoverNanos,
Tombstoned: sp.Tombstoned,
Policies: sp.policies,
}
}
func (spj stagedPoliciesJSON) StagedPolicies() StagedPolicies {
return NewStagedPolicies(spj.CutoverNanos, spj.Tombstoned, spj.Policies)
}
// PoliciesList is a list of staged policies.
type PoliciesList []StagedPolicies
// IsDefault determines whether this is a default policies list.
func (l PoliciesList) IsDefault() bool {
return len(l) == 1 && l[0].IsDefault()
}
// VersionedPoliciesList is a versioned policies list.
type VersionedPoliciesList struct {
// Version is the version associcated with the policies in the list.
Version int `json:"version"`
// PoliciesList contains the list of staged policies.
PoliciesList PoliciesList `json:"policiesList"`
}