138 lines
2.6 KiB
Go
138 lines
2.6 KiB
Go
package projects
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import (
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"fmt"
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"io/fs"
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"os"
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"sync"
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"time"
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"gitlab.sweetwater.com/it/devops/tools/gitlab-project-manager/internal/gitlab"
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"golang.org/x/exp/slog"
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"gopkg.in/yaml.v3"
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)
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type Cache struct {
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Projects []*gitlab.ProjectInfo
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Aliases []*gitlab.ProjectAlias
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Updated time.Time
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readFromFile bool
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lock *sync.Mutex
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ttl time.Duration
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file string
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log *slog.Logger
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}
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type CacheOpts struct {
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Path string
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TTL time.Duration
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Logger *slog.Logger
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}
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// Load cache, if already loaded and
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// up to date,
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func (c *Cache) Load() error {
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var err error
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if !c.readFromFile {
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c.Read()
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}
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if time.Since(c.Updated) > c.ttl {
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c.log.Info("Project cache stale, updating.")
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c.Refresh()
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}
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return err
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}
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func (c *Cache) Write() {
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file, err := os.OpenFile(c.file, os.O_RDWR, fs.ModeAppend)
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if err != nil {
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c.log.Error("Failed to write cache to disk", "error", err)
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}
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d := yaml.NewEncoder(file)
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if err = d.Encode(*c); err != nil {
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c.log.Error("Failed to Marshal cache to yaml", "error", err)
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} else {
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c.log.Info("Cache saved to disk")
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}
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}
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func (c *Cache) Read() {
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c.lock.Lock()
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defer c.lock.Unlock()
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c.log.Info("Reading project cache from disk", "file", c.file)
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file, err := os.Open(c.file)
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if err != nil {
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c.log.Error("Failed to read project cache", "error", err)
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return
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}
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d := yaml.NewDecoder(file)
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d.Decode(c)
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if time.Since(c.Updated) > c.ttl {
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c.refresh()
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}
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c.readFromFile = true
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c.log.Debug(c.String())
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}
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func (c *Cache) refresh() {
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c.log.Info("Refreshing project cache, this may take a while")
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defer c.setUpdated()
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}
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func (c *Cache) Refresh() {
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c.lock.Lock()
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defer c.lock.Unlock()
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c.refresh()
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}
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func (c *Cache) String() string {
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return fmt.Sprintf("Cache Updated %s: Projects %d, Aliases %d",
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c.Updated.String(),
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len(c.Projects),
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len(c.Aliases))
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}
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func (c *Cache) setUpdated() {
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c.Updated = time.Now()
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}
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func (c *Cache) SetUpdated() {
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c.lock.Lock()
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defer c.lock.Unlock()
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c.setUpdated()
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}
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func (c *Cache) GetUpdated() time.Time {
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return c.Updated
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}
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// Returns a new project cache ready to load from
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// cache file.
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// Cache.Load() must be called manually
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func NewProjectCache(opts *CacheOpts) (*Cache, error) {
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var err error
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if _, err = os.Stat(opts.Path); err != nil {
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err = createProjectCache(opts.Path)
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}
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cache := &Cache{
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Projects: make([]*gitlab.ProjectInfo, 0),
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Aliases: make([]*gitlab.ProjectAlias, 0),
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file: opts.Path,
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ttl: opts.TTL,
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lock: &sync.Mutex{},
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log: opts.Logger,
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}
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return cache, err
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}
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func createProjectCache(path string) error {
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return os.WriteFile(path, nil, 0640)
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}
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