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debug.go
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debug.go
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package proxy
import (
"encoding/json"
"fmt"
log "github.com/Sirupsen/logrus"
"github.com/zalando/skipper/eskip"
"io"
"io/ioutil"
"net/http"
)
type (
debugRequest struct {
Method string `json:"method"`
Uri string `json:"uri"`
Proto string `json:"proto"`
Header http.Header `json:"header,omitempty"`
Host string `json:"host,omitempty"`
RemoteAddress string `json:"remote_address,omitempty"`
}
debugResponseMod struct {
Status *int `json:"status,omitempty"`
Header http.Header `json:"header,omitempty"`
}
debugDocument struct {
RouteId string `json:"route_id,omitempty"`
Route string `json:"route,omitempty"`
Incoming *debugRequest `json:"incoming,omitempty"`
Outgoing *debugRequest `json:"outgoing,omitempty"`
ResponseMod *debugResponseMod `json:"response_mod,omitempty"`
RequestBody string `json:"request_body,omitempty"`
RequestErr string `json:"request_error,omitempty"`
ResponseModBody string `json:"response_mod_body,omitempty"`
ResponseModErr string `json:"response_mod_error,omitempty"`
ProxyError string `json:"proxy_error,omitempty"`
FilterPanics []string `json:"filter_panics,omitempty"`
Filters []*eskip.Filter `json:"filters,omitempty"`
Predicates []*eskip.Predicate `json:"predicates,omitempty"`
}
)
type debugInfo struct {
route *eskip.Route
incoming *http.Request
outgoing *http.Request
response *http.Response
err error
filterPanics []interface{}
}
func convertRequest(r *http.Request) *debugRequest {
return &debugRequest{
Method: r.Method,
Uri: r.RequestURI,
Proto: r.Proto,
Header: r.Header,
Host: r.Host,
RemoteAddress: r.RemoteAddr}
}
func convertBody(body io.Reader) (string, string) {
b, err := ioutil.ReadAll(body)
out := string(b)
var errstr string
if err == nil {
errstr = ""
} else {
errstr = err.Error()
}
return out, errstr
}
func convertDebugInfo(d *debugInfo) debugDocument {
doc := debugDocument{}
if d.route != nil {
doc.RouteId = d.route.Id
doc.Route = d.route.String()
doc.Filters = d.route.Filters
doc.Predicates = d.route.Predicates
}
var requestBody io.Reader
if d.incoming == nil {
log.Error("[debug response] missing incoming request")
} else {
doc.Incoming = convertRequest(d.incoming)
requestBody = d.incoming.Body
}
if d.outgoing != nil {
doc.Outgoing = convertRequest(d.outgoing)
// if there is an outgoing request, use the body from there
requestBody = d.outgoing.Body
}
if requestBody != nil {
doc.RequestBody, doc.RequestErr = convertBody(requestBody)
}
if d.response != nil {
if d.response.StatusCode != 0 || len(d.response.Header) != 0 {
doc.ResponseMod = &debugResponseMod{Header: d.response.Header}
if d.response.StatusCode != 0 {
s := d.response.StatusCode
doc.ResponseMod.Status = &s
}
}
if d.response.Body != nil {
doc.ResponseModBody, doc.ResponseModErr = convertBody(d.response.Body)
}
}
if d.err != nil {
doc.ProxyError = d.err.Error()
}
for _, fp := range d.filterPanics {
doc.FilterPanics = append(doc.FilterPanics, fmt.Sprint(fp))
}
return doc
}
func dbgResponse(w http.ResponseWriter, d *debugInfo) {
w.Header().Set("Content-Type", "application/json")
doc := convertDebugInfo(d)
enc := json.NewEncoder(w)
if err := enc.Encode(&doc); err != nil {
log.Error("[debug response]", err)
}
}