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package module
import (
"bytes"
"fmt"
"os"
"encoding/hex"
"sync"
"tunnel/pkg/server/env"
"tunnel/pkg/server/opts"
"tunnel/pkg/server/queue"
)
const teeDefaultPath = "/tmp/tunnel.dump"
type tee struct {
f *os.File
mu sync.Mutex
wg sync.WaitGroup
}
type teeModule struct {
path string
}
func (t *tee) dump(s string, p []byte) error {
var out bytes.Buffer
fmt.Fprintln(&out, s, len(p))
w := hex.Dumper(&out)
w.Write(p)
w.Close()
if _, err := t.f.Write(out.Bytes()); err != nil {
return err
}
return nil
}
func (t *tee) Send(rq, wq queue.Q) error {
defer t.wg.Done()
for b := range rq {
t.dump(">", b)
wq <- b
}
return nil
}
func (t *tee) Recv(rq, wq queue.Q) error {
defer t.wg.Done()
for b := range rq {
t.dump("<", b)
wq <- b
}
return nil
}
func (m *teeModule) where(env env.Env) string {
if m.path != "" {
return m.path
}
if v := env.Eval("@{tunnel.@{tunnel}.tee.path}"); v != "" {
return v
}
if v, ok := env.Find("module.tee.path"); ok {
return v
}
return teeDefaultPath
}
func (m *teeModule) Open(env env.Env) (interface{}, error) {
tid, sid := env.Get("tunnel"), env.Get("stream")
name := fmt.Sprintf("%s.%s.%s", m.where(env), tid, sid)
var t tee
if f, err := os.Create(name); err != nil {
return nil, err
} else {
t.f = f
}
t.wg.Add(2)
go func() {
t.wg.Wait()
t.f.Close()
}()
return &t, nil
}
func newTeeModule(opts opts.Opts, env env.Env) (module, error) {
m := &teeModule{}
if path, ok := opts["path"]; ok {
m.path = path
}
return m, nil
}
func init() {
register("tee", newTeeModule)
}
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