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plan.go
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/
plan.go
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// Copyright 2021 The Karavel Project
//
// 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 plan
import (
"context"
"fmt"
"sync"
"github.com/karavel-io/cli/internal/helmw"
"github.com/karavel-io/cli/pkg/config"
"github.com/karavel-io/cli/pkg/logger"
)
type Plan struct {
components map[string]*Component
seenComponents map[string]string
log logger.Logger
}
func NewFromConfig(ctx context.Context, cfg *config.Config) (*Plan, error) {
log := logger.FromContext(ctx)
p := New(log)
var wg sync.WaitGroup
ch := make(chan error)
components := make(chan Component, 10)
done := make(chan bool)
for _, c := range cfg.Components {
wg.Add(1)
go func(cc config.Component) {
defer wg.Done()
chartName := cc.Name
if cc.ComponentName != "" {
chartName = cc.ComponentName
}
log.Debugf("Loading component '%s'", chartName)
meta, err := helmw.GetChartManifest(ctx, chartName, cc.Version, cc.Unstable)
if err != nil {
ch <- fmt.Errorf("failed to load component '%s': %w", chartName, err)
return
}
comp, err := NewComponentFromChartMetadata(meta, cc.Unstable)
if err != nil {
ch <- fmt.Errorf("failed to instantiate component configuration: %w", err)
return
}
if cc.ComponentName != "" {
comp.name = cc.Name
}
comp.namespace = cc.Namespace
comp.jsonParams = cc.JsonParams
components <- comp
log.Debugf("Loaded component %s", comp.DebugLabel())
}(c)
}
go func() {
wg.Wait()
done <- true
}()
for {
select {
case err := <-ch:
return nil, err
case comp := <-components:
err := p.AddComponent(comp)
if err != nil {
return nil, fmt.Errorf("failed to build plan from config: %w", err)
}
case <-done:
return &p, nil
}
}
}
func New(log logger.Logger) Plan {
return Plan{
components: map[string]*Component{},
seenComponents: map[string]string{},
log: log,
}
}
func (p *Plan) Components() []*Component {
var cc []*Component
for _, c := range p.components {
cc = append(cc, c)
}
return cc
}
func (p *Plan) GetComponent(name string) *Component {
return p.components[name]
}
func (p *Plan) AddComponent(c Component) error {
if p.components[c.name] != nil {
return fmt.Errorf("duplicate component '%s' found", c.name)
}
if other := p.seenComponents[c.ComponentName()]; c.singleton && other != "" {
withAlias := ""
if name := c.NameOverride(); name != "" {
withAlias = fmt.Sprintf(" with alias '%s'", name)
}
return fmt.Errorf("component '%s'%s is a singleton, but another instance called '%s' is already declared", c.ComponentName(), withAlias, other)
}
p.components[c.name] = &c
p.seenComponents[c.ComponentName()] = c.name
return nil
}
func (p *Plan) HasComponent(name string) bool {
return p.components[name] != nil
}
func (p *Plan) Validate() error {
if err := p.checkDependencies(); err != nil {
return err
}
if err := p.processIntegrations(); err != nil {
return err
}
return nil
}
func (p *Plan) checkDependencies() error {
for n, c := range p.components {
for _, dn := range c.dependencies {
if !p.HasComponent(dn) {
return fmt.Errorf("missing dependency: component '%s' requires '%s'", n, dn)
}
}
}
return nil
}
func (p *Plan) processIntegrations() error {
for _, c := range p.components {
c.integrations = make(map[string]bool)
for integ, dd := range c.integrationsDeps {
active := len(dd) > 0
for _, dn := range dd {
active = active && p.HasComponent(dn)
}
c.integrations[integ] = active
}
if err := c.patchIntegrations(p.log); err != nil {
return err
}
}
return nil
}