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variables.go
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variables.go
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package native
import (
"bytes"
"encoding/base64"
"fmt"
"io"
"net/http"
"net/netip"
"net/url"
"strconv"
"strings"
"time"
"github.com/pkg/errors"
)
// Used for req.body
func (r *Runtime) RequestBody() (string, error) {
switch r.Request.Method {
case http.MethodPatch, http.MethodPost, http.MethodPut:
var b bytes.Buffer
if _, err := b.ReadFrom(r.Request.Body); err != nil {
return "", errors.WithStack(
fmt.Errorf("Failed to read request body: %s", err),
)
}
r.Request.Body = io.NopCloser(bytes.NewReader(b.Bytes()))
// size is limited to 8KB
if len(b.Bytes()) > 1024*8 {
return "", errors.WithStack(
fmt.Errorf("Request body is limited by 8KB, overflow"),
)
}
return b.String(), nil
default:
return "", nil
}
}
// Used for req.body.base64
func (r *Runtime) RequestBodyBase64() (string, error) {
body, err := r.RequestBody()
if err != nil {
return "", errors.WithStack(err)
}
return base64.StdEncoding.EncodeToString([]byte(body)), nil
}
// Used for req.url and bereq.url
func (r *Runtime) RequestURL(req *http.Request) string {
u := req.URL.Path
if v := req.URL.RawQuery; v != "" {
u += "?" + v
}
if v := req.URL.RawFragment; v != "" {
u += "#" + v
}
return u
}
// Used for bereq.body_bytes_written
func (r *Runtime) BackendBodyBytesWritten() (int64, error) {
if r.BackendRequest == nil {
return 0, nil
}
switch r.BackendRequest.Method {
case http.MethodPatch, http.MethodPost, http.MethodPut:
var b bytes.Buffer
if _, err := b.ReadFrom(r.BackendRequest.Body); err != nil {
return 0, errors.WithStack(
fmt.Errorf("Failed to read backend request body: %s", err),
)
}
r.BackendRequest.Body = io.NopCloser(bytes.NewReader(b.Bytes()))
return int64(len(b.Bytes())), nil
default:
return 0, nil
}
}
// Used for bereq.header_bytes_written
func (r *Runtime) BackendHeaderBytesWritten() int64 {
if r.BackendRequest == nil {
return 0
}
var size int
for key, val := range r.BackendRequest.Header {
size += len(key)
for i := range val {
size += len(val[i]) + 1
}
size--
}
return int64(size)
}
// Used for bereq.bytes_written
func (r *Runtime) BackendBytesWritten() (int64, error) {
if r.BackendRequest == nil {
return 0, nil
}
var size int64
// Request line
size += int64(len(fmt.Sprintf(
"%s %s %s",
r.BackendRequest.Method,
r.BackendRequest.URL.String(),
r.BackendRequest.Proto,
)))
// Headers
size += r.BackendHeaderBytesWritten() + 1
// Body
body, err := r.BackendBodyBytesWritten()
if err != nil {
return 0, errors.WithStack(err)
}
size += body
return size, nil
}
// Used for obj.age
func (r *Runtime) ObjectAge() time.Duration {
if r.BackendResponse == nil {
return 0
}
dur := "0"
if v := r.BackendResponse.Header.Get("Age"); v != "" {
dur = v
}
d, err := time.ParseDuration(dur + "s")
if err != nil {
return 0
}
return d
}
// Fastly follows its own cache freshness rules
// see: https://developer.fastly.com/learning/concepts/cache-freshness/
var cacheableStatusCodes = []int{200, 203, 300, 301, 302, 404, 410}
// Used for obj.cachable
func (r *Runtime) ObjectCacheable() bool {
if r.BackendResponse == nil {
return false
}
for i := range cacheableStatusCodes {
if r.BackendResponse.StatusCode == cacheableStatusCodes[i] {
return true
}
}
return false
}
// Used for obj.hits
func (r *Runtime) ObjectHits() int64 {
if r.BackendResponse == nil {
return 0
}
hits := "0"
if v := r.BackendResponse.Header.Get("X-Cache-Hits"); v != "" {
hits = v
}
h, err := strconv.ParseInt(hits, 10, 64)
if err != nil {
return 0
}
return h
}
// Used for req.is_ipv6
func (r *Runtime) IsIpv6() bool {
parsed, err := netip.ParseAddr(r.Request.RemoteAddr)
if err != nil {
return false
}
return parsed.Is6()
}
// Used for req.body_bytes_read
func (r *Runtime) RequestBodyBytesRead() (int64, error) {
switch r.Request.Method {
case http.MethodPatch, http.MethodPost, http.MethodPut:
var b bytes.Buffer
if _, err := b.ReadFrom(r.Request.Body); err != nil {
return 0, errors.WithStack(
fmt.Errorf("Failed to read backend request body: %s", err),
)
}
r.Request.Body = io.NopCloser(bytes.NewReader(b.Bytes()))
return int64(len(b.Bytes())), nil
default:
return 0, nil
}
}
// Used for req.bytes_read
func (r *Runtime) RequestBytesRead() (int64, error) {
var size int64
// Request line
size += int64(len(fmt.Sprintf(
"%s %s %s",
r.Request.Method,
r.Request.URL.String(),
r.Request.Proto,
)))
// Headers
for key, val := range r.Request.Header {
size += int64(len(key))
for i := range val {
size += int64(len(val[i])) + 1
}
size--
}
// Body
body, err := r.RequestBodyBytesRead()
if err != nil {
return 0, errors.WithStack(err)
}
size += body
return size, nil
}
// Used for resp.response and beresp.response
func (r *Runtime) ResponseBody(resp *http.Response) (string, error) {
if resp == nil {
return "", nil
}
var b bytes.Buffer
if _, err := b.ReadFrom(resp.Body); err != nil {
return "", errors.WithStack(
fmt.Errorf("Failed to read response body: %s", err),
)
}
// rewind
resp.Body = io.NopCloser(bytes.NewReader(b.Bytes()))
return b.String(), nil
}
// Used for req.url and bereq.url setting
func (r *Runtime) SetURL(req *http.Request, dst *url.URL) {
req.URL.Path = dst.Path
req.URL.RawQuery = dst.RawQuery
req.URL.RawFragment = dst.RawFragment
}
// Used for beresp.response and resp.response setting
func (r *Runtime) SetResponseBody(resp *http.Response, body string) {
// Explicitly discard old response
_, _ = io.ReadAll(resp.Body) // nolint:errcheck
resp.Body = io.NopCloser(strings.NewReader(body))
}