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logbody.go
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logbody.go
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package diag
import (
"fmt"
"io"
"github.com/zalando/skipper/filters"
"github.com/zalando/skipper/filters/flowid"
)
type logBody struct {
limit int
request bool
response bool
}
// NewLogBody creates a filter specification for the 'logBody()' filter.
func NewLogBody() filters.Spec { return logBody{} }
// Name returns the logBody filtern name.
func (logBody) Name() string {
return filters.LogBodyName
}
func (logBody) CreateFilter(args []interface{}) (filters.Filter, error) {
var (
request = false
response = false
)
if len(args) != 2 {
return nil, filters.ErrInvalidFilterParameters
}
opt, ok := args[0].(string)
if !ok {
return nil, filters.ErrInvalidFilterParameters
}
switch opt {
case "response":
response = true
case "request":
request = true
default:
return nil, fmt.Errorf("failed to match %q: %w", opt, filters.ErrInvalidFilterParameters)
}
limit, ok := args[1].(float64)
if !ok || float64(int(limit)) != limit {
return nil, fmt.Errorf("failed to convert to int: %w", filters.ErrInvalidFilterParameters)
}
return &logBody{
limit: int(limit),
request: request,
response: response,
}, nil
}
func (lb *logBody) Request(ctx filters.FilterContext) {
if !lb.request {
return
}
req := ctx.Request()
if req.Body != nil {
req.Body = newLogBodyStream(
lb.limit,
func(chunk []byte) {
ctx.Logger().Infof(
`logBody("request") %s: %q`,
req.Header.Get(flowid.HeaderName),
chunk)
},
req.Body,
)
}
}
func (lb *logBody) Response(ctx filters.FilterContext) {
if !lb.response {
return
}
rsp := ctx.Response()
if rsp.Body != nil {
rsp.Body = newLogBodyStream(
lb.limit,
func(chunk []byte) {
ctx.Logger().Infof(
`logBody("response") %s: %q`,
ctx.Request().Header.Get(flowid.HeaderName),
chunk)
},
rsp.Body,
)
}
}
type logBodyStream struct {
left int
f func([]byte)
input io.ReadCloser
}
func newLogBodyStream(left int, f func([]byte), rc io.ReadCloser) io.ReadCloser {
return &logBodyStream{
left: left,
f: f,
input: rc,
}
}
func (lb *logBodyStream) Read(p []byte) (n int, err error) {
n, err = lb.input.Read(p)
if lb.left > 0 && n > 0 {
m := min(n, lb.left)
lb.f(p[:m])
lb.left -= m
}
return n, err
}
func (lb *logBodyStream) Close() error {
return lb.input.Close()
}