File size: 3,601 Bytes
0f07ba7 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 |
package middleware
import (
"bytes"
"github.com/emirpasic/gods/v2/queues/circularbuffer"
"io"
"net/http"
"sort"
"sync"
"time"
"github.com/labstack/echo/v4"
"github.com/mudler/LocalAI/core/application"
"github.com/mudler/xlog"
)
type APIExchangeRequest struct {
Method string `json:"method"`
Path string `json:"path"`
Headers *http.Header `json:"headers"`
Body *[]byte `json:"body"`
}
type APIExchangeResponse struct {
Status int `json:"status"`
Headers *http.Header `json:"headers"`
Body *[]byte `json:"body"`
}
type APIExchange struct {
Timestamp time.Time `json:"timestamp"`
Request APIExchangeRequest `json:"request"`
Response APIExchangeResponse `json:"response"`
}
var traceBuffer *circularbuffer.Queue[APIExchange]
var mu sync.Mutex
var logChan = make(chan APIExchange, 100)
type bodyWriter struct {
http.ResponseWriter
body *bytes.Buffer
}
func (w *bodyWriter) Write(b []byte) (int, error) {
w.body.Write(b)
return w.ResponseWriter.Write(b)
}
func (w *bodyWriter) Flush() {
if flusher, ok := w.ResponseWriter.(http.Flusher); ok {
flusher.Flush()
}
}
// TraceMiddleware intercepts and logs JSON API requests and responses
func TraceMiddleware(app *application.Application) echo.MiddlewareFunc {
if app.ApplicationConfig().EnableTracing && traceBuffer == nil {
traceBuffer = circularbuffer.New[APIExchange](app.ApplicationConfig().TracingMaxItems)
go func() {
for exchange := range logChan {
mu.Lock()
traceBuffer.Enqueue(exchange)
mu.Unlock()
}
}()
}
return func(next echo.HandlerFunc) echo.HandlerFunc {
return func(c echo.Context) error {
if !app.ApplicationConfig().EnableTracing {
return next(c)
}
if c.Request().Header.Get("Content-Type") != "application/json" {
return next(c)
}
body, err := io.ReadAll(c.Request().Body)
if err != nil {
xlog.Error("Failed to read request body")
return err
}
// Restore the body for downstream handlers
c.Request().Body = io.NopCloser(bytes.NewBuffer(body))
startTime := time.Now()
// Wrap response writer to capture body
resBody := new(bytes.Buffer)
mw := &bodyWriter{
ResponseWriter: c.Response().Writer,
body: resBody,
}
c.Response().Writer = mw
err = next(c)
if err != nil {
c.Response().Writer = mw.ResponseWriter // Restore original writer if error
return err
}
// Create exchange log
requestHeaders := c.Request().Header.Clone()
requestBody := make([]byte, len(body))
copy(requestBody, body)
responseHeaders := c.Response().Header().Clone()
responseBody := make([]byte, resBody.Len())
copy(responseBody, resBody.Bytes())
exchange := APIExchange{
Timestamp: startTime,
Request: APIExchangeRequest{
Method: c.Request().Method,
Path: c.Path(),
Headers: &requestHeaders,
Body: &requestBody,
},
Response: APIExchangeResponse{
Status: c.Response().Status,
Headers: &responseHeaders,
Body: &responseBody,
},
}
select {
case logChan <- exchange:
default:
xlog.Warn("Trace channel full, dropping trace")
}
return nil
}
}
}
// GetTraces returns a copy of the logged API exchanges for display
func GetTraces() []APIExchange {
mu.Lock()
traces := traceBuffer.Values()
mu.Unlock()
sort.Slice(traces, func(i, j int) bool {
return traces[i].Timestamp.Before(traces[j].Timestamp)
})
return traces
}
// ClearTraces clears the in-memory logs
func ClearTraces() {
mu.Lock()
traceBuffer.Clear()
mu.Unlock()
}
|