51 lines
1.6 KiB
Go
51 lines
1.6 KiB
Go
package proxy
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import (
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"context"
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"errors"
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"net"
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"sync"
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"google.golang.org/protobuf/types/known/anypb"
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)
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var (
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// handlers is the map of registered handlers
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handlers sync.Map
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// ErrUnknownProtocol specifies the provided protocol has no registered handler
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ErrUnknownProtocol = errors.New("proxy: handler not found for protocol")
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// ErrProtocolAlreadyRegistered specifies the provided protocol has already been registered
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ErrProtocolAlreadyRegistered = errors.New("proxy: protocol already registered")
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)
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// ProxyConnFn is called after the call to ConnectConnection on the cluster.
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// ProxyConnFn blocks until the specific request that is being proxied is finished
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type ProxyConnFn func()
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// Handler is the type that all proxies need to implement to be called by the worker
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// when a new client connection is created. If there is an error ProxyConnFn must
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// be nil. If there is no error ProxyConnFn must be set. When Handler has
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// returned, it is expected that the initial connection to the endpoint has been
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// established.
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type Handler func(context.Context, net.Conn, *ProxyDialer, string, *anypb.Any) (ProxyConnFn, error)
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func RegisterHandler(protocol string, handler Handler) error {
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_, loaded := handlers.LoadOrStore(protocol, handler)
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if loaded {
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return ErrProtocolAlreadyRegistered
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}
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return nil
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}
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// GetHandler returns the handler registered for the provided protocol. If the protocol
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// is not registered nil and ErrUnknownProtocol is returned.
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func GetHandler(protocol string) (Handler, error) {
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handler, ok := handlers.Load(protocol)
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if !ok {
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return nil, ErrUnknownProtocol
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}
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return handler.(Handler), nil
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}
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