woodpecker/vendor/github.com/sourcegraph/jsonrpc2/conn_opt.go
2017-03-05 18:57:06 +11:00

96 lines
2.5 KiB
Go

package jsonrpc2
import (
"encoding/json"
"log"
"sync"
)
// ConnOpt is the type of function that can be passed to NewConn to
// customize the Conn before it is created.
type ConnOpt func(*Conn)
// OnRecv causes all requests received on conn to invoke f(req, nil)
// and all responses to invoke f(req, resp),
func OnRecv(f func(*Request, *Response)) ConnOpt {
return func(c *Conn) { c.onRecv = f }
}
// OnSend causes all requests sent on conn to invoke f(req, nil) and
// all responses to invoke f(nil, resp),
func OnSend(f func(*Request, *Response)) ConnOpt {
return func(c *Conn) { c.onSend = f }
}
// LogMessages causes all messages sent and received on conn to be
// logged using the provided logger.
func LogMessages(log *log.Logger) ConnOpt {
return func(c *Conn) {
// Remember reqs we have received so we can helpfully show the
// request method in OnSend for responses.
var (
mu sync.Mutex
reqMethods = map[ID]string{}
)
OnRecv(func(req *Request, resp *Response) {
switch {
case req != nil && resp == nil:
mu.Lock()
reqMethods[req.ID] = req.Method
mu.Unlock()
params, _ := json.Marshal(req.Params)
if req.Notif {
log.Printf("--> notif: %s: %s", req.Method, params)
} else {
log.Printf("--> request #%s: %s: %s", req.ID, req.Method, params)
}
case resp != nil:
var method string
if req != nil {
method = req.Method
} else {
method = "(no matching request)"
}
switch {
case resp.Result != nil:
result, _ := json.Marshal(resp.Result)
log.Printf("--> result #%s: %s: %s", resp.ID, method, result)
case resp.Error != nil:
err, _ := json.Marshal(resp.Error)
log.Printf("--> error #%s: %s: %s", resp.ID, method, err)
}
}
})(c)
OnSend(func(req *Request, resp *Response) {
switch {
case req != nil:
params, _ := json.Marshal(req.Params)
if req.Notif {
log.Printf("<-- notif: %s: %s", req.Method, params)
} else {
log.Printf("<-- request #%s: %s: %s", req.ID, req.Method, params)
}
case resp != nil:
mu.Lock()
method := reqMethods[resp.ID]
delete(reqMethods, resp.ID)
mu.Unlock()
if method == "" {
method = "(no previous request)"
}
if resp.Result != nil {
result, _ := json.Marshal(resp.Result)
log.Printf("<-- result #%s: %s: %s", resp.ID, method, result)
} else {
err, _ := json.Marshal(resp.Error)
log.Printf("<-- error #%s: %s: %s", resp.ID, method, err)
}
}
})(c)
}
}