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modelgeneration.go
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modelgeneration.go
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// Copyright 2018 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package modelgeneration
import (
"time"
"github.com/juju/errors"
"github.com/juju/names/v4"
"github.com/juju/juju/api/base"
"github.com/juju/juju/apiserver/params"
"github.com/juju/juju/core/model"
)
// Client provides methods that the Juju client command uses to interact
// with models stored in the Juju Server.
type Client struct {
base.ClientFacade
facade base.FacadeCaller
}
// NewClient creates a new `Client` based on an existing authenticated API
// connection.
func NewClient(st base.APICallCloser) *Client {
frontend, backend := base.NewClientFacade(st, "ModelGeneration")
return &Client{ClientFacade: frontend, facade: backend}
}
// AddBranch adds a new branch to the model.
func (c *Client) AddBranch(branchName string) error {
var result params.ErrorResult
err := c.facade.FacadeCall("AddBranch", argForBranch(branchName), &result)
if err != nil {
return errors.Trace(err)
}
if result.Error != nil {
return errors.Trace(result.Error)
}
return nil
}
// Abort aborts an existing branch to the model.
func (c *Client) AbortBranch(branchName string) error {
var result params.ErrorResult
err := c.facade.FacadeCall("AbortBranch", argForBranch(branchName), &result)
if err != nil {
return errors.Trace(err)
}
if result.Error != nil {
return errors.Trace(result.Error)
}
return nil
}
// CommitBranch commits the branch with the input name to the model,
// effectively completing it and applying all branch changes across the model.
// The new generation ID of the model is returned.
func (c *Client) CommitBranch(branchName string) (int, error) {
var result params.IntResult
err := c.facade.FacadeCall("CommitBranch", argForBranch(branchName), &result)
if err != nil {
return 0, errors.Trace(err)
}
if result.Error != nil {
return 0, errors.Trace(result.Error)
}
return result.Result, nil
}
// ListCommits returns the details of all committed model branches.
func (c *Client) ListCommits() (model.GenerationCommits, error) {
var result params.BranchResults
err := c.facade.FacadeCall("ListCommits", nil, &result)
if err != nil {
return nil, errors.Trace(err)
}
if result.Error != nil {
return nil, errors.Trace(result.Error)
}
return generationCommitsFromResults(result), nil
}
// ShowCommit details of the branch with the input generation ID.
func (c *Client) ShowCommit(generationId int) (model.GenerationCommit, error) {
var result params.GenerationResult
arg := params.GenerationId{GenerationId: generationId}
err := c.facade.FacadeCall("ShowCommit", arg, &result)
if err != nil {
return model.GenerationCommit{}, errors.Trace(err)
}
if result.Error != nil {
return model.GenerationCommit{}, errors.Trace(result.Error)
}
return generationCommitFromResult(result), nil
}
// TrackBranch sets the input units and/or applications
// to track changes made under the input branch name.
func (c *Client) TrackBranch(branchName string, entities []string, numUnits int) error {
var result params.ErrorResults
arg := params.BranchTrackArg{
BranchName: branchName,
NumUnits: numUnits,
}
if len(entities) == 0 {
return errors.New("no units or applications specified")
}
for _, entity := range entities {
switch {
case names.IsValidApplication(entity):
arg.Entities = append(arg.Entities,
params.Entity{Tag: names.NewApplicationTag(entity).String()})
case names.IsValidUnit(entity):
arg.Entities = append(arg.Entities,
params.Entity{Tag: names.NewUnitTag(entity).String()})
default:
return errors.Errorf("%q is not an application or a unit", entity)
}
}
err := c.facade.FacadeCall("TrackBranch", arg, &result)
if err != nil {
return errors.Trace(err)
}
if err := result.Combine(); err != nil {
return errors.Trace(err)
}
return nil
}
// HasActiveBranch returns true if the model has an
// "in-flight" branch with the input name.
func (c *Client) HasActiveBranch(branchName string) (bool, error) {
var result params.BoolResult
err := c.facade.FacadeCall("HasActiveBranch", argForBranch(branchName), &result)
if err != nil {
return false, errors.Trace(err)
}
if result.Error != nil {
return false, errors.Trace(result.Error)
}
return result.Result, nil
}
// BranchInfo returns information about "in-flight" branches.
// If a non-empty string is supplied for branch name,
// then only information for that branch is returned.
// Supplying true for detailed returns extra unit detail for the branch.
func (c *Client) BranchInfo(
branchName string, detailed bool, formatTime func(time.Time) string,
) (model.GenerationSummaries, error) {
arg := params.BranchInfoArgs{Detailed: detailed}
if branchName != "" {
arg.BranchNames = []string{branchName}
}
var result params.BranchResults
err := c.facade.FacadeCall("BranchInfo", arg, &result)
if err != nil {
return nil, errors.Trace(err)
}
if result.Error != nil {
return nil, errors.Trace(result.Error)
}
return generationInfoFromResult(result, detailed, formatTime), nil
}
func argForBranch(branchName string) params.BranchArg {
return params.BranchArg{
BranchName: branchName,
}
}
func generationInfoFromResult(
results params.BranchResults, detailed bool, formatTime func(time.Time) string,
) model.GenerationSummaries {
summaries := make(model.GenerationSummaries)
for _, res := range results.Generations {
appDeltas := make([]model.GenerationApplication, len(res.Applications))
for i, a := range res.Applications {
bApp := model.GenerationApplication{
ApplicationName: a.ApplicationName,
UnitProgress: a.UnitProgress,
ConfigChanges: a.ConfigChanges,
}
if detailed {
bApp.UnitDetail = &model.GenerationUnits{
UnitsTracking: a.UnitsTracking,
UnitsPending: a.UnitsPending,
}
}
appDeltas[i] = bApp
}
summaries[res.BranchName] = model.Generation{
Created: formatTime(time.Unix(res.Created, 0)),
CreatedBy: res.CreatedBy,
Applications: appDeltas,
}
}
return summaries
}
func generationCommitsFromResults(results params.BranchResults) model.GenerationCommits {
commits := make(model.GenerationCommits, len(results.Generations))
for i, gen := range results.Generations {
commits[i] = model.GenerationCommit{
GenerationId: gen.GenerationId,
Completed: time.Unix(gen.Completed, 0),
CompletedBy: gen.CompletedBy,
BranchName: gen.BranchName,
}
}
return commits
}
func generationCommitFromResult(result params.GenerationResult) model.GenerationCommit {
genCommit := result.Generation
appChanges := make([]model.GenerationApplication, len(genCommit.Applications))
for i, a := range genCommit.Applications {
app := model.GenerationApplication{
ApplicationName: a.ApplicationName,
ConfigChanges: a.ConfigChanges,
UnitDetail: &model.GenerationUnits{UnitsTracking: a.UnitsTracking},
}
appChanges[i] = app
}
modelCommit := model.GenerationCommit{
BranchName: genCommit.BranchName,
Completed: time.Unix(genCommit.Completed, 0),
CompletedBy: genCommit.CompletedBy,
Created: time.Unix(genCommit.Created, 0),
CreatedBy: genCommit.CreatedBy,
GenerationId: genCommit.GenerationId,
Applications: appChanges,
}
return modelCommit
}