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package module
import (
"tunnel/pkg/server/queue"
"tunnel/pkg/server/opts"
"tunnel/pkg/server/env"
"fmt"
"log"
)
type moduleInitFunc func (opts.Opts, env.Env) (module, error)
var modules = map[string]moduleInitFunc{}
type module interface {
Open(env env.Env) (Pipe, Pipe)
}
type M interface {
module
String() string
}
type Pipe func (rq, wq queue.Q) error
func (p Pipe) Open(env env.Env) (Pipe, Pipe) {
return p, nil
}
type reverse struct {
M
}
func Reverse(m M) M {
return &reverse{m}
}
func (r *reverse) Open(env env.Env) (Pipe, Pipe) {
p1, p2 := r.M.Open(env)
return p2, p1
}
type named struct {
name string
module
}
func (m *named) String() string {
return fmt.Sprintf("module:%s", m.name)
}
func register(name string, f moduleInitFunc) {
if _, ok := modules[name]; ok {
log.Panicf("duplicate module name '%s'", name)
}
modules[name] = f
}
func registerPipe(name string, p Pipe) {
register(name, func (opts.Opts, env.Env) (module, error) {
return p, nil
})
}
func New(desc string, env env.Env) (M, error) {
name, opts := opts.Parse(desc)
if f, ok := modules[name]; !ok {
return nil, fmt.Errorf("unknown module '%s'", name)
} else if m, err := f(opts, env); err != nil {
return nil, err
} else {
return &named{name: name, module: m}, nil
}
}
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