specify loadbalance strategy on dubbo proxy (#613)

Author: mark4z

pixiu/pkg/client/dubbo/config.go

@@ -33,4 +33,6 @@ type DubboProxyConfig struct {
 	AutoResolve bool `yaml:"auto_resolve" json:"auto_resolve,omitempty"`
 	// Protoset path to load protoset files
 	Protoset []string `yaml:"protoset" json:"protoset,omitempty"`
+	// Load
+	LoadBalance string `yaml:"load_balance"  json:"load_balance,omitempty"`
 }

pixiu/pkg/client/dubbo/dubbo.go

@@ -27,7 +27,12 @@ import (
 
 import (
 	_ "dubbo.apache.org/dubbo-go/v3/cluster/cluster/failover"
+	_ "dubbo.apache.org/dubbo-go/v3/cluster/loadbalance/consistenthashing"
+	_ "dubbo.apache.org/dubbo-go/v3/cluster/loadbalance/leastactive"
+	_ "dubbo.apache.org/dubbo-go/v3/cluster/loadbalance/p2c"
 	_ "dubbo.apache.org/dubbo-go/v3/cluster/loadbalance/random"
+	_ "dubbo.apache.org/dubbo-go/v3/cluster/loadbalance/ringhash"
+	_ "dubbo.apache.org/dubbo-go/v3/cluster/loadbalance/roundrobin"
 	"dubbo.apache.org/dubbo-go/v3/common/constant"
 	_ "dubbo.apache.org/dubbo-go/v3/common/proxy/proxy_factory"
 	dg "dubbo.apache.org/dubbo-go/v3/config"
@@ -313,6 +318,7 @@ func (dc *Client) create(key string, irequest fc.IntegrationRequest) *generic.Ge
 		Generic:       "true",
 		Version:       irequest.DubboBackendConfig.Version,
 		Group:         irequest.Group,
+		Loadbalance:   dc.dubboProxyConfig.LoadBalance,
 	}
 
 	if len(irequest.DubboBackendConfig.Retries) == 0 {