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frontend.go
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frontend.go
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// Copyright (c) 2018-2019 Aalborg University
// Use of this source code is governed by a GPLv3
// license that can be found in the LICENSE file.
package store
import (
"gopkg.in/yaml.v2"
"io/ioutil"
"os"
"sync"
)
type FrontendStore interface {
GetFrontends(...string) []InstanceConfig
SetMemoryMB(string, uint) error
SetCpu(string, float64) error
runHooks() error
}
func NewFrontendsFile(path string) (FrontendStore, error) {
var conf struct {
Frontends []InstanceConfig `yaml:"frontends"`
}
var m sync.Mutex
save := func() error {
m.Lock()
defer m.Unlock()
bytes, err := yaml.Marshal(conf)
if err != nil {
return err
}
return ioutil.WriteFile(path, bytes, 0644)
}
// file exists
frontends := make(map[string]InstanceConfig)
if _, err := os.Stat(path); !os.IsNotExist(err) {
f, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
err = yaml.Unmarshal(f, &conf)
if err != nil {
return nil, err
}
for _, f := range conf.Frontends {
if err := f.Validate(); err != nil {
return nil, err
}
frontends[f.Image] = f
}
}
return &frontendstore{
frontends: frontends,
hooks: []func([]InstanceConfig) error{
func(ics []InstanceConfig) error {
conf.Frontends = ics
return save()
},
},
}, nil
}
type frontendstore struct {
frontends map[string]InstanceConfig
hooks []func([]InstanceConfig) error
}
func (fs *frontendstore) GetFrontends(names ...string) []InstanceConfig {
var res []InstanceConfig
for _, name := range names {
ic, ok := fs.frontends[name]
if !ok {
ic = InstanceConfig{Image: name}
}
res = append(res, ic)
}
return res
}
func (fs *frontendstore) SetMemoryMB(f string, memoryMB uint) error {
ic, ok := fs.frontends[f]
if !ok {
ic = InstanceConfig{
Image: f,
}
}
ic.MemoryMB = memoryMB
if err := ic.Validate(); err != nil {
return err
}
fs.frontends[f] = ic
fs.runHooks()
return nil
}
func (fs *frontendstore) SetCpu(f string, cpu float64) error {
ic, ok := fs.frontends[f]
if !ok {
ic = InstanceConfig{
Image: f,
}
}
ic.CPU = cpu
if err := ic.Validate(); err != nil {
return err
}
fs.frontends[f] = ic
fs.runHooks()
return nil
}
func (fs *frontendstore) runHooks() error {
var frontends []InstanceConfig
for _, f := range fs.frontends {
frontends = append(frontends, f)
}
for _, h := range fs.hooks {
if err := h(frontends); err != nil {
return err
}
}
return nil
}