134 lines
3.4 KiB
Go
134 lines
3.4 KiB
Go
// Commons for HTTP handling
|
|
package rpc
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"net/http"
|
|
"net/url"
|
|
"runtime/debug"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/tendermint/tendermint/alert"
|
|
. "github.com/tendermint/tendermint/common"
|
|
)
|
|
|
|
type APIStatus string
|
|
|
|
const (
|
|
API_OK APIStatus = "OK"
|
|
API_ERROR APIStatus = "ERROR"
|
|
API_INVALID_PARAM APIStatus = "INVALID_PARAM"
|
|
API_UNAUTHORIZED APIStatus = "UNAUTHORIZED"
|
|
API_REDIRECT APIStatus = "REDIRECT"
|
|
)
|
|
|
|
type APIResponse struct {
|
|
Status APIStatus `json:"status"`
|
|
Data interface{} `json:"data"`
|
|
}
|
|
|
|
func (res APIResponse) Error() string {
|
|
return fmt.Sprintf("Status(%v) %v", res.Status, res.Data)
|
|
}
|
|
|
|
// Throws a panic which the RecoverAndLogHandler catches.
|
|
func ReturnJSON(status APIStatus, data interface{}) {
|
|
res := APIResponse{}
|
|
res.Status = status
|
|
res.Data = data
|
|
panic(res)
|
|
}
|
|
|
|
// Wraps an HTTP handler, adding error logging.
|
|
//
|
|
// If the inner function panics, the outer function recovers, logs, sends an
|
|
// HTTP 500 error response.
|
|
func RecoverAndLogHandler(handler http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
// Wrap the ResponseWriter to remember the status
|
|
rww := &ResponseWriterWrapper{-1, w}
|
|
begin := time.Now()
|
|
|
|
// Common headers
|
|
origin := r.Header.Get("Origin")
|
|
originUrl, err := url.Parse(origin)
|
|
if err == nil {
|
|
originHost := strings.Split(originUrl.Host, ":")[0]
|
|
if strings.HasSuffix(originHost, ".ftnox.com") {
|
|
rww.Header().Set("Access-Control-Allow-Origin", origin)
|
|
rww.Header().Set("Access-Control-Allow-Credentials", "true")
|
|
rww.Header().Set("Access-Control-Expose-Headers", "X-Server-Time")
|
|
}
|
|
}
|
|
rww.Header().Set("X-Server-Time", fmt.Sprintf("%v", begin.Unix()))
|
|
|
|
defer func() {
|
|
// Send a 500 error if a panic happens during a handler.
|
|
// Without this, Chrome & Firefox were retrying aborted ajax requests,
|
|
// at least to my localhost.
|
|
if e := recover(); e != nil {
|
|
|
|
// If APIResponse,
|
|
if res, ok := e.(APIResponse); ok {
|
|
resJSON, err := json.Marshal(res)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
rww.Header().Set("Content-Type", "application/json")
|
|
switch res.Status {
|
|
case API_OK:
|
|
rww.WriteHeader(200)
|
|
case API_ERROR:
|
|
rww.WriteHeader(400)
|
|
case API_UNAUTHORIZED:
|
|
rww.WriteHeader(401)
|
|
case API_INVALID_PARAM:
|
|
rww.WriteHeader(420)
|
|
case API_REDIRECT:
|
|
rww.WriteHeader(430)
|
|
default:
|
|
rww.WriteHeader(440)
|
|
}
|
|
rww.Write(resJSON)
|
|
} else {
|
|
// For the rest,
|
|
rww.WriteHeader(http.StatusInternalServerError)
|
|
rww.Write([]byte("Internal Server Error"))
|
|
log.Error("Panic in HTTP handler", "error", e, "stack", debug.Stack())
|
|
}
|
|
}
|
|
|
|
// Finally, log.
|
|
durationMS := time.Since(begin).Nanoseconds() / 1000000
|
|
if rww.Status == -1 {
|
|
rww.Status = 200
|
|
}
|
|
log.Debug(Fmt("%s %s %v %v %s", r.RemoteAddr, r.Method, rww.Status, durationMS, r.URL))
|
|
}()
|
|
|
|
handler.ServeHTTP(rww, r)
|
|
})
|
|
}
|
|
|
|
// Remember the status for logging
|
|
type ResponseWriterWrapper struct {
|
|
Status int
|
|
http.ResponseWriter
|
|
}
|
|
|
|
func (w *ResponseWriterWrapper) WriteHeader(status int) {
|
|
w.Status = status
|
|
w.ResponseWriter.WriteHeader(status)
|
|
}
|
|
|
|
// Stick it as a deferred statement in gouroutines to prevent the program from crashing.
|
|
func Recover(daemonName string) {
|
|
if e := recover(); e != nil {
|
|
stack := string(debug.Stack())
|
|
errorString := fmt.Sprintf("[%s] %s\n%s", daemonName, e, stack)
|
|
alert.Alert(errorString)
|
|
}
|
|
}
|