/
router.go
71 lines (56 loc) · 1.49 KB
/
router.go
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package client
import (
"context"
"fmt"
"github.com/brianmcgee/enats/pkg/rpc"
"github.com/brianmcgee/enats/pkg/tracking"
"github.com/juju/errors"
"github.com/nats-io/nats.go"
"gitlab.com/pjrpc/pjrpc/v2"
"go.uber.org/zap"
)
const (
ErrUnsupportedMethod = errors.ConstError("unsupported method")
)
type Handler = func(ctx context.Context, req *pjrpc.Request, resp *pjrpc.Response)
type Router struct {
SubjectPrefix string
conn *nats.Conn
ht *tracking.HeadTracker
log *zap.Logger
handlers map[string]Handler
}
func (r *Router) Route(ctx context.Context, req *pjrpc.Request, resp *pjrpc.Response) {
route := r.handlers[req.Method]
if route == nil {
resp.SetError(ErrUnsupportedMethod)
return
}
route(ctx, req, resp)
}
func (r *Router) invoke(ctx context.Context, subject string, req *pjrpc.Request, resp *pjrpc.Response) {
msg := nats.NewMsg(fmt.Sprintf("%s.%s", r.SubjectPrefix, subject))
msg.Header.Set(rpc.HeaderMethod, req.Method)
msg.Data = req.Params
reply, err := r.conn.RequestMsgWithContext(ctx, msg)
if err != nil {
resp.SetError(err)
return
}
errResp := reply.Header.Get(rpc.HeaderErr)
if errResp != "" {
resp.SetError(errors.New(errResp))
return
}
resp.Result = reply.Data
}
func NewRouter(conn *nats.Conn, ht *tracking.HeadTracker, subjectPrefix string, log *zap.Logger) Router {
router := Router{
SubjectPrefix: subjectPrefix,
conn: conn,
ht: ht,
log: log,
}
router.handlers = defaultRoutes(&router)
return router
}