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package conn
import (
"errors"
"sync"
gitalyauth "gitlab.com/gitlab-org/gitaly/auth"
"gitlab.com/gitlab-org/gitaly/client"
"gitlab.com/gitlab-org/gitaly/internal/praefect/grpc-proxy/proxy"
"google.golang.org/grpc"
)
// ErrConnectionNotFound indicates the connection for a given storage has not yet been registered
var ErrConnectionNotFound = errors.New("client connection not found")
// ErrAlreadyRegistered indicates the client connection for a given storage has already been registered
var ErrAlreadyRegistered = errors.New("client connection already registered")
// ClientConnections contains ready to use grpc client connections
type ClientConnections struct {
connMutex sync.RWMutex
nodes map[string]*grpc.ClientConn
}
// NewClientConnections creates a new ClientConnections struct
func NewClientConnections() *ClientConnections {
return &ClientConnections{
nodes: make(map[string]*grpc.ClientConn),
}
}
// RegisterNode will direct traffic to the supplied downstream connection when the storage location
// is encountered.
func (c *ClientConnections) RegisterNode(storageName, listenAddr, token string) error {
conn, err := client.Dial(listenAddr,
[]grpc.DialOption{
grpc.WithDefaultCallOptions(grpc.CallCustomCodec(proxy.Codec())),
grpc.WithPerRPCCredentials(gitalyauth.RPCCredentials(token)),
},
)
if err != nil {
return err
}
return c.setConn(storageName, conn)
}
func (c *ClientConnections) setConn(storageName string, conn *grpc.ClientConn) error {
c.connMutex.Lock()
if _, ok := c.nodes[storageName]; ok {
return ErrAlreadyRegistered
}
c.nodes[storageName] = conn
c.connMutex.Unlock()
return nil
}
// GetConnection gets the grpc client connection based on an address
func (c *ClientConnections) GetConnection(storageName string) (*grpc.ClientConn, error) {
c.connMutex.RLock()
cc, ok := c.nodes[storageName]
c.connMutex.RUnlock()
if !ok {
return nil, ErrConnectionNotFound
}
return cc, nil
}
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