ginuerzh
1b07475bf3
Each rewriteBody/rewriteResponseBody/rewriteRequestBody rule can now optionally reference a named rewriter plugin (HTTP/gRPC backend) via the rewriter field. When set, body rewriting delegates to the plugin rather than applying pattern/replacement, while content-type filtering still applies. Coincident fixes: - rewriter/plugin/grpc: return nil when conn is nil (avoid nil-ptr panic) - rewriter/plugin/http: drain response body in defer to prevent leaks - config/parsing/rewriter: pass TimeoutOption to gRPC plugin - config/parsing/service: warn when referenced rewriter is not registered
91 lines
1.6 KiB
Go
91 lines
1.6 KiB
Go
package rewriter
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import (
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"context"
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"encoding/json"
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"io"
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"github.com/go-gost/core/logger"
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"github.com/go-gost/core/rewriter"
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"github.com/go-gost/plugin/rewriter/proto"
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"github.com/go-gost/x/internal/plugin"
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"google.golang.org/grpc"
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)
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type grpcPlugin struct {
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conn grpc.ClientConnInterface
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client proto.RewriterClient
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log logger.Logger
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}
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// NewGRPCPlugin creates a Rewriter plugin based on gRPC.
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func NewGRPCPlugin(name string, addr string, opts ...plugin.Option) rewriter.Rewriter {
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var options plugin.Options
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for _, opt := range opts {
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opt(&options)
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}
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log := logger.Default().WithFields(map[string]any{
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"kind": "rewriter",
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"rewriter": name,
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})
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conn, err := plugin.NewGRPCConn(addr, &options)
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if err != nil {
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log.Error(err)
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}
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if conn == nil {
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return nil
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}
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p := &grpcPlugin{
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conn: conn,
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log: log,
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}
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p.client = proto.NewRewriterClient(conn)
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return p
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}
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func (p *grpcPlugin) Rewrite(ctx context.Context, b []byte, opts ...rewriter.RewriteOption) ([]byte, error) {
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if p.client == nil {
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return b, nil
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}
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var options rewriter.RewriteOptions
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for _, opt := range opts {
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opt(&options)
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}
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md, err := json.Marshal(options.Metadata)
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if err != nil {
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return b, err
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}
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reply, err := p.client.Rewrite(ctx,
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&proto.RewriteRequest{
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Data: b,
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Metadata: md,
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})
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if err != nil {
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p.log.Error(err)
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return b, err
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}
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if reply == nil || !reply.Ok {
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return b, nil
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}
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if reply.Data != nil {
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return reply.Data, nil
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}
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return b, nil
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}
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func (p *grpcPlugin) Close() error {
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if p.conn == nil {
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return nil
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}
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if closer, ok := p.conn.(io.Closer); ok {
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return closer.Close()
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}
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return nil
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}
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