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locker.go
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locker.go
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package clients
import (
"sync"
"github.com/samber/lo"
"google.golang.org/grpc"
)
type Locker[T any] interface {
// Use obtains exclusive ownership of the client, then calls the provided
// function with the client. Ownership of the client is maintained until the
// function returns.
// It is safe to call Use if the Locker is nil; it will simply return false.
Use(func(T)) bool
// Close releases the client. After Close is called, Use() will return false.
Close()
}
func NewLocker[T any](cc grpc.ClientConnInterface, builder func(grpc.ClientConnInterface) T) Locker[T] {
return &clientLocker[T]{
client: builder(cc),
}
}
type clientLocker[T any] struct {
sync.Mutex
client T
closed bool
}
func (cl *clientLocker[T]) Close() {
if cl == nil {
return
}
cl.Lock()
defer cl.Unlock()
if !cl.closed {
cl.client = lo.Empty[T]()
cl.closed = true
}
}
func (cl *clientLocker[T]) Use(fn func(T)) bool {
if cl == nil {
return false
}
cl.Lock()
defer cl.Unlock()
if cl.closed {
return false
}
fn(cl.client)
return true
}