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session.go
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session.go
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package command
import (
"sync"
lru "github.com/hashicorp/golang-lru/v2"
"github.com/stateful/runme/v3/internal/ulid"
)
// Session is an object which lifespan contains multiple executions.
// It's used to exchange information between executions. Currently,
// it only keeps track of environment variables.
type Session struct {
ID string
envStore *envStore
}
func NewSession() *Session {
return &Session{
ID: ulid.GenerateID(),
envStore: newEnvStore(),
}
}
func NewSessionWithEnv(env ...string) (*Session, error) {
s := NewSession()
if err := s.SetEnv(env...); err != nil {
return nil, err
}
return s, nil
}
func MustNewSessionWithEnv(env ...string) *Session {
s, err := NewSessionWithEnv(env...)
if err != nil {
panic(err)
}
return s
}
func (s *Session) SetEnv(env ...string) error {
_, err := s.envStore.Merge(env...)
return err
}
func (s *Session) DeleteEnv(keys ...string) {
for _, k := range keys {
s.envStore.Delete(k)
}
}
func (s *Session) GetEnv() []string {
if s == nil {
return nil
}
return s.envStore.Items()
}
// SessionListCapacity is a maximum number of sessions
// stored in a single SessionList.
const SessionListCapacity = 1024
type SessionList struct {
items *lru.Cache[string, *Session]
// Even though, the lry.Cache is thread-safe, it does not provide a way to
// get the most recent added session.
mu sync.Mutex
latestSession *Session
}
func NewSessionList() (*SessionList, error) {
cache, err := lru.New[string, *Session](SessionListCapacity)
if err != nil {
return nil, err
}
return &SessionList{items: cache}, nil
}
func (sl *SessionList) Add(session *Session) {
sl.items.Add(session.ID, session)
sl.mu.Lock()
sl.latestSession = session
sl.mu.Unlock()
}
func (sl *SessionList) Get(id string) (*Session, bool) {
return sl.items.Get(id)
}
func (sl *SessionList) List() []*Session {
return sl.items.Values()
}
func (sl *SessionList) Delete(id string) bool {
ok := sl.items.Remove(id)
if !ok {
return ok
}
sl.mu.Lock()
if sl.latestSession != nil && sl.latestSession.ID == id {
keys := sl.items.Keys()
sl.latestSession, _ = sl.items.Get(keys[len(keys)-1])
}
sl.mu.Unlock()
return ok
}
func (sl *SessionList) Newest() (*Session, bool) {
return sl.latestSession, sl.latestSession != nil
}