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logheader.go
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logheader.go
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package diag
import (
"bytes"
"strings"
log "github.com/sirupsen/logrus"
"github.com/zalando/skipper/filters"
)
type logHeader struct {
request bool
response bool
}
// NewLogHeader creates a filter specification for the 'logHeader()' filter.
func NewLogHeader() filters.Spec { return logHeader{} }
// Name returns the logHeader filtern name.
func (logHeader) Name() string {
return filters.LogHeaderName
}
func (logHeader) CreateFilter(args []interface{}) (filters.Filter, error) {
var (
request = false
response = false
)
// default behavior
if len(args) == 0 {
request = true
}
for i := range args {
opt, ok := args[i].(string)
if !ok {
return nil, filters.ErrInvalidFilterParameters
}
switch strings.ToLower(opt) {
case "response":
response = true
case "request":
request = true
}
}
return logHeader{
request: request,
response: response,
}, nil
}
func (lh logHeader) Response(ctx filters.FilterContext) {
if !lh.response {
return
}
req := ctx.Request()
resp := ctx.Response()
buf := bytes.NewBuffer(nil)
buf.WriteString(req.Method)
buf.WriteString(" ")
buf.WriteString(req.URL.Path)
buf.WriteString(" ")
buf.WriteString(req.Proto)
buf.WriteString("\r\n")
buf.WriteString(resp.Status)
buf.WriteString("\r\n")
for k, v := range resp.Header {
if strings.ToLower(k) == "authorization" {
buf.WriteString(k)
buf.WriteString(": ")
buf.WriteString("TRUNCATED\r\n")
} else {
buf.WriteString(k)
buf.WriteString(": ")
buf.WriteString(strings.Join(v, " "))
buf.WriteString("\r\n")
}
}
buf.WriteString("\r\n")
log.Println("Response for", buf.String())
}
func (lh logHeader) Request(ctx filters.FilterContext) {
if !lh.request {
return
}
req := ctx.Request()
buf := bytes.NewBuffer(nil)
buf.WriteString(req.Method)
buf.WriteString(" ")
buf.WriteString(req.URL.Path)
buf.WriteString(" ")
buf.WriteString(req.Proto)
buf.WriteString("\r\nHost: ")
buf.WriteString(req.Host)
buf.WriteString("\r\n")
for k, v := range req.Header {
if strings.ToLower(k) == "authorization" {
buf.WriteString(k)
buf.WriteString(": ")
buf.WriteString("TRUNCATED\r\n")
} else {
buf.WriteString(k)
buf.WriteString(": ")
buf.WriteString(strings.Join(v, " "))
buf.WriteString("\r\n")
}
}
buf.WriteString("\r\n")
log.Println(buf.String())
}