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dialer.go
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/
dialer.go
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package grpcutil
import (
"sync"
"google.golang.org/grpc"
)
type dialer struct {
opts []grpc.DialOption
// A map from addresses to connections
connMap map[string]*grpc.ClientConn
lock sync.Mutex
}
func newDialer(opts ...grpc.DialOption) *dialer {
return &dialer{
opts: opts,
connMap: make(map[string]*grpc.ClientConn),
}
}
func (d *dialer) Dial(addr string) (*grpc.ClientConn, error) {
d.lock.Lock()
defer d.lock.Unlock()
if conn, ok := d.connMap[addr]; ok {
return conn, nil
}
conn, err := grpc.Dial(addr, d.opts...)
if err != nil {
return nil, err
}
d.connMap[addr] = conn
return conn, nil
}
func (d *dialer) CloseConns() error {
d.lock.Lock()
defer d.lock.Unlock()
for addr, conn := range d.connMap {
if err := conn.Close(); err != nil {
return err
}
delete(d.connMap, addr)
}
return nil
}