add reload and plugin support for hop

config/parsing/chain/parse.go

@@ -0,0 +1,52 @@
+package chain
+
+import (
+	"github.com/go-gost/core/chain"
+	"github.com/go-gost/core/hop"
+	"github.com/go-gost/core/logger"
+	"github.com/go-gost/core/metadata"
+	xchain "github.com/go-gost/x/chain"
+	"github.com/go-gost/x/config"
+	hop_parser "github.com/go-gost/x/config/parsing/hop"
+	mdx "github.com/go-gost/x/metadata"
+	"github.com/go-gost/x/registry"
+)
+
+func ParseChain(cfg *config.ChainConfig) (chain.Chainer, error) {
+	if cfg == nil {
+		return nil, nil
+	}
+
+	chainLogger := logger.Default().WithFields(map[string]any{
+		"kind":  "chain",
+		"chain": cfg.Name,
+	})
+
+	var md metadata.Metadata
+	if cfg.Metadata != nil {
+		md = mdx.NewMetadata(cfg.Metadata)
+	}
+
+	c := xchain.NewChain(cfg.Name,
+		xchain.MetadataChainOption(md),
+		xchain.LoggerChainOption(chainLogger),
+	)
+
+	for _, ch := range cfg.Hops {
+		var hop hop.Hop
+		var err error
+
+		if ch.Nodes != nil || ch.Plugin != nil {
+			if hop, err = hop_parser.ParseHop(ch); err != nil {
+				return nil, err
+			}
+		} else {
+			hop = registry.HopRegistry().Get(ch.Name)
+		}
+		if hop != nil {
+			c.AddHop(hop)
+		}
+	}
+
+	return c, nil
+}