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