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service.go
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service.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package yarpcmeta
import (
"context"
"go.uber.org/yarpc"
"go.uber.org/yarpc/api/transport"
"go.uber.org/yarpc/encoding/json"
"go.uber.org/yarpc/internal/introspection"
)
// Register new yarpc meta procedures a dispatcher, exposing information about
// the dispatcher itself.
func Register(d *yarpc.Dispatcher) {
ms := &service{d}
d.Register(ms.Procedures())
}
// service exposes dispatcher informations via Procedures().
type service struct {
disp *yarpc.Dispatcher
}
type procsResponse struct {
Service string `json:"service"`
Procedures []introspection.Procedure `json:"procedures"`
}
func (m *service) procs(ctx context.Context, body interface{}) (*procsResponse, error) {
procedures := introspection.IntrospectProcedures(m.disp.Router().Procedures())
return &procsResponse{
Service: m.disp.Name(),
Procedures: procedures,
}, nil
}
func (m *service) introspect(ctx context.Context, body interface{}) (*introspection.DispatcherStatus, error) {
status := m.disp.Introspect()
return &status, nil
}
// Procedures returns the procedures to register on a dispatcher.
func (m *service) Procedures() []transport.Procedure {
methods := []struct {
Name string
Handler interface{}
Signature string
}{
{"yarpc::procedures", m.procs,
`procedures() {"service": "...", "procedures": [{"name": "..."}]}`},
{"yarpc::introspect", m.introspect,
`introspect() {...}`},
}
var r []transport.Procedure
for _, m := range methods {
p := json.Procedure(m.Name, m.Handler)[0]
p.Signature = m.Signature
r = append(r, p)
}
return r
}