mirror of
https://github.com/caddyserver/caddy.git
synced 2024-11-25 09:40:13 +08:00
Performance improvements to Replacer implementation (placeholders) (#2674)
Closes #2673
This commit is contained in:
Matt Holt
GitHub
parent
bdf92ee84e
commit
b44a22a9d4
|
|
@ -15,86 +15,143 @@
|
|||
package caddyhttp
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"net"
|
||||
"net/http"
|
||||
"net/textproto"
|
||||
"path"
|
||||
"strconv"
|
||||
"strings"
|
||||
|
||||
"github.com/caddyserver/caddy/v2"
|
||||
)
|
||||
|
||||
// TODO: A simple way to format or escape or encode each value would be nice
|
||||
// ... TODO: Should we just use templates? :-/ yeesh...
|
||||
|
||||
func addHTTPVarsToReplacer(repl caddy.Replacer, req *http.Request, w http.ResponseWriter) {
|
||||
httpVars := func() map[string]string {
|
||||
m := make(map[string]string)
|
||||
httpVars := func(key string) (string, bool) {
|
||||
if req != nil {
|
||||
m["http.request.host"] = func() string {
|
||||
if strings.HasPrefix(key, queryReplPrefix) {
|
||||
vals := req.URL.Query()[key[len(queryReplPrefix):]]
|
||||
// always return true, since the query param might
|
||||
// be present only in some requests
|
||||
return strings.Join(vals, ","), true
|
||||
}
|
||||
|
||||
if strings.HasPrefix(key, reqHeaderReplPrefix) {
|
||||
field := key[len(reqHeaderReplPrefix):]
|
||||
vals := req.Header[textproto.CanonicalMIMEHeaderKey(field)]
|
||||
// always return true, since the header field might
|
||||
// be present only in some requests
|
||||
return strings.Join(vals, ","), true
|
||||
}
|
||||
|
||||
if strings.HasPrefix(key, cookieReplPrefix) {
|
||||
name := key[len(cookieReplPrefix):]
|
||||
for _, cookie := range req.Cookies() {
|
||||
if strings.EqualFold(name, cookie.Name) {
|
||||
// always return true, since the cookie might
|
||||
// be present only in some requests
|
||||
return cookie.Value, true
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
switch key {
|
||||
case "http.request.host":
|
||||
host, _, err := net.SplitHostPort(req.Host)
|
||||
if err != nil {
|
||||
return req.Host // OK; there probably was no port
|
||||
return req.Host, true // OK; there probably was no port
|
||||
}
|
||||
return host
|
||||
}()
|
||||
m["http.request.hostport"] = req.Host // may include both host and port
|
||||
m["http.request.method"] = req.Method
|
||||
m["http.request.port"] = func() string {
|
||||
// if there is no port, there will be an error; in
|
||||
// that case, port is the empty string anyway
|
||||
return host, true
|
||||
case "http.request.hostport":
|
||||
return req.Host, true
|
||||
case "http.request.method":
|
||||
return req.Method, true
|
||||
case "http.request.port":
|
||||
_, port, _ := net.SplitHostPort(req.Host)
|
||||
return port
|
||||
}()
|
||||
m["http.request.scheme"] = func() string {
|
||||
return port, true
|
||||
case "http.request.scheme":
|
||||
if req.TLS != nil {
|
||||
return "https"
|
||||
return "https", true
|
||||
}
|
||||
return "http"
|
||||
}()
|
||||
m["http.request.uri"] = req.URL.RequestURI()
|
||||
m["http.request.uri.path"] = req.URL.Path
|
||||
m["http.request.uri.path.file"] = func() string {
|
||||
return "http", true
|
||||
case "http.request.uri":
|
||||
return req.URL.RequestURI(), true
|
||||
case "http.request.uri.path":
|
||||
return req.URL.Path, true
|
||||
case "http.request.uri.path.file":
|
||||
_, file := path.Split(req.URL.Path)
|
||||
return file
|
||||
}()
|
||||
m["http.request.uri.path.dir"] = func() string {
|
||||
return file, true
|
||||
case "http.request.uri.path.dir":
|
||||
dir, _ := path.Split(req.URL.Path)
|
||||
return dir
|
||||
}()
|
||||
m["http.request.uri.query"] = req.URL.RawQuery
|
||||
|
||||
for param, vals := range req.URL.Query() {
|
||||
m["http.request.uri.query."+param] = strings.Join(vals, ",")
|
||||
}
|
||||
for field, vals := range req.Header {
|
||||
m["http.request.header."+strings.ToLower(field)] = strings.Join(vals, ",")
|
||||
}
|
||||
for _, cookie := range req.Cookies() {
|
||||
m["http.request.cookie."+cookie.Name] = cookie.Value
|
||||
return dir, true
|
||||
case "http.request.uri.query":
|
||||
return req.URL.RawQuery, true
|
||||
}
|
||||
|
||||
hostLabels := strings.Split(req.Host, ".")
|
||||
for i, label := range hostLabels {
|
||||
key := fmt.Sprintf("http.request.host.labels.%d", len(hostLabels)-i-1)
|
||||
m[key] = label
|
||||
if strings.HasPrefix(key, respHeaderReplPrefix) {
|
||||
field := key[len(respHeaderReplPrefix):]
|
||||
vals := w.Header()[textproto.CanonicalMIMEHeaderKey(field)]
|
||||
// always return true, since the header field might
|
||||
// be present only in some requests
|
||||
return strings.Join(vals, ","), true
|
||||
}
|
||||
|
||||
pathParts := strings.Split(req.URL.Path, "/")
|
||||
for i, label := range pathParts {
|
||||
key := fmt.Sprintf("http.request.uri.path.%d", i)
|
||||
m[key] = label
|
||||
if strings.HasPrefix(key, hostLabelReplPrefix) {
|
||||
idxStr := key[len(hostLabelReplPrefix):]
|
||||
idx, err := strconv.Atoi(idxStr)
|
||||
if err != nil {
|
||||
return "", false
|
||||
}
|
||||
hostLabels := strings.Split(req.Host, ".")
|
||||
if idx < 0 {
|
||||
return "", false
|
||||
}
|
||||
if idx >= len(hostLabels) {
|
||||
return "", true
|
||||
}
|
||||
return hostLabels[idx], true
|
||||
}
|
||||
|
||||
if strings.HasPrefix(key, pathPartsReplPrefix) {
|
||||
idxStr := key[len(pathPartsReplPrefix):]
|
||||
idx, err := strconv.Atoi(idxStr)
|
||||
if err != nil {
|
||||
return "", false
|
||||
}
|
||||
pathParts := strings.Split(req.URL.Path, "/")
|
||||
if len(pathParts) > 0 && pathParts[0] == "" {
|
||||
pathParts = pathParts[1:]
|
||||
}
|
||||
if idx < 0 {
|
||||
return "", false
|
||||
}
|
||||
if idx >= len(pathParts) {
|
||||
return "", true
|
||||
}
|
||||
return pathParts[idx], true
|
||||
}
|
||||
}
|
||||
|
||||
if w != nil {
|
||||
for field, vals := range w.Header() {
|
||||
m["http.response.header."+strings.ToLower(field)] = strings.Join(vals, ",")
|
||||
if strings.HasPrefix(key, respHeaderReplPrefix) {
|
||||
field := key[len(respHeaderReplPrefix):]
|
||||
vals := w.Header()[textproto.CanonicalMIMEHeaderKey(field)]
|
||||
// always return true, since the header field might
|
||||
// be present only in some responses
|
||||
return strings.Join(vals, ","), true
|
||||
}
|
||||
}
|
||||
|
||||
return m
|
||||
return "", false
|
||||
}
|
||||
|
||||
repl.Map(httpVars)
|
||||
}
|
||||
|
||||
const (
|
||||
queryReplPrefix = "http.request.uri.query."
|
||||
reqHeaderReplPrefix = "http.request.header."
|
||||
cookieReplPrefix = "http.request.cookie."
|
||||
hostLabelReplPrefix = "http.request.host.labels."
|
||||
pathPartsReplPrefix = "http.request.uri.path."
|
||||
respHeaderReplPrefix = "http.response.header."
|
||||
)
|
||||
|
|
|
|||
146
replacer.go
146
replacer.go
|
|
@ -25,7 +25,7 @@ import (
|
|||
type Replacer interface {
|
||||
Set(variable, value string)
|
||||
Delete(variable string)
|
||||
Map(func() map[string]string)
|
||||
Map(ReplacementFunc)
|
||||
ReplaceAll(input, empty string) string
|
||||
}
|
||||
|
||||
|
|
@ -34,23 +34,22 @@ func NewReplacer() Replacer {
|
|||
rep := &replacer{
|
||||
static: make(map[string]string),
|
||||
}
|
||||
rep.providers = []ReplacementsFunc{
|
||||
defaultReplacements,
|
||||
func() map[string]string { return rep.static },
|
||||
rep.providers = []ReplacementFunc{
|
||||
globalDefaultReplacements,
|
||||
rep.fromStatic,
|
||||
}
|
||||
return rep
|
||||
}
|
||||
|
||||
type replacer struct {
|
||||
providers []ReplacementsFunc
|
||||
providers []ReplacementFunc
|
||||
static map[string]string
|
||||
}
|
||||
|
||||
// Map augments the map of replacements with those returned
|
||||
// by the given replacements function. The function is only
|
||||
// executed at replace-time.
|
||||
func (r *replacer) Map(replacements func() map[string]string) {
|
||||
r.providers = append(r.providers, replacements)
|
||||
// Map adds mapFunc to the list of value providers.
|
||||
// mapFunc will be executed only at replace-time.
|
||||
func (r *replacer) Map(mapFunc ReplacementFunc) {
|
||||
r.providers = append(r.providers, mapFunc)
|
||||
}
|
||||
|
||||
// Set sets a custom variable to a static value.
|
||||
|
|
@ -64,55 +63,104 @@ func (r *replacer) Delete(variable string) {
|
|||
delete(r.static, variable)
|
||||
}
|
||||
|
||||
// ReplaceAll replaces placeholders in input with their values.
|
||||
// Values that are empty string will be substituted with the
|
||||
// empty parameter.
|
||||
func (r *replacer) ReplaceAll(input, empty string) string {
|
||||
if !strings.Contains(input, phOpen) {
|
||||
return input
|
||||
}
|
||||
for _, replacements := range r.providers {
|
||||
for key, val := range replacements() {
|
||||
if val == "" {
|
||||
val = empty
|
||||
}
|
||||
input = strings.ReplaceAll(input, phOpen+key+phClose, val)
|
||||
}
|
||||
}
|
||||
return input
|
||||
// fromStatic provides values from r.static.
|
||||
func (r *replacer) fromStatic(key string) (val string, ok bool) {
|
||||
val, ok = r.static[key]
|
||||
return
|
||||
}
|
||||
|
||||
// ReplacementsFunc is a function that returns replacements,
|
||||
// which is variable names mapped to their values. The
|
||||
// function will be evaluated only at replace-time to ensure
|
||||
// the most current values are mapped.
|
||||
type ReplacementsFunc func() map[string]string
|
||||
|
||||
var defaultReplacements = func() map[string]string {
|
||||
m := map[string]string{
|
||||
"system.hostname": func() string {
|
||||
// OK if there is an error; just return empty string
|
||||
name, _ := os.Hostname()
|
||||
return name
|
||||
}(),
|
||||
"system.slash": string(filepath.Separator),
|
||||
"system.os": runtime.GOOS,
|
||||
"system.arch": runtime.GOARCH,
|
||||
// ReplaceAll efficiently replaces placeholders in input with
|
||||
// their values. Unrecognized placeholders will not be replaced.
|
||||
// Values that are empty string will be substituted with empty.
|
||||
func (r *replacer) ReplaceAll(input, empty string) string {
|
||||
if !strings.Contains(input, string(phOpen)) {
|
||||
return input
|
||||
}
|
||||
|
||||
// add environment variables
|
||||
for _, keyval := range os.Environ() {
|
||||
parts := strings.SplitN(keyval, "=", 2)
|
||||
if len(parts) != 2 {
|
||||
var sb strings.Builder
|
||||
|
||||
// it is reasonable to assume that the output
|
||||
// will be approximately as long as the input
|
||||
sb.Grow(len(input))
|
||||
|
||||
// iterate the input to find each placeholder
|
||||
var lastWriteCursor int
|
||||
for i := 0; i < len(input); i++ {
|
||||
if input[i] != phOpen {
|
||||
continue
|
||||
}
|
||||
m["env."+strings.ToLower(parts[0])] = parts[1]
|
||||
|
||||
// write the substring from the last cursor to this point
|
||||
sb.WriteString(input[lastWriteCursor:i])
|
||||
|
||||
// find the end of the placeholder
|
||||
end := strings.Index(input[i:], string(phClose)) + i
|
||||
|
||||
// trim opening bracket
|
||||
key := input[i+1 : end]
|
||||
|
||||
// try to get a value for this key; if
|
||||
// the key is not recognized, do not
|
||||
// perform any replacement
|
||||
var found bool
|
||||
for _, mapFunc := range r.providers {
|
||||
if val, ok := mapFunc(key); ok {
|
||||
found = true
|
||||
if val != "" {
|
||||
sb.WriteString(val)
|
||||
} else if empty != "" {
|
||||
sb.WriteString(empty)
|
||||
}
|
||||
break
|
||||
}
|
||||
}
|
||||
if !found {
|
||||
continue
|
||||
}
|
||||
|
||||
// advance cursor to end of placeholder
|
||||
i = end + 1
|
||||
lastWriteCursor = i
|
||||
}
|
||||
|
||||
return m
|
||||
// flush any unwritten remainder
|
||||
sb.WriteString(input[lastWriteCursor:])
|
||||
|
||||
return sb.String()
|
||||
}
|
||||
|
||||
// ReplacementFunc is a function that returns a replacement
|
||||
// for the given key along with true if the function is able
|
||||
// to service that key (even if the value is blank). If the
|
||||
// function does not recognize the key, false should be
|
||||
// returned.
|
||||
type ReplacementFunc func(key string) (val string, ok bool)
|
||||
|
||||
func globalDefaultReplacements(key string) (string, bool) {
|
||||
// check environment variable
|
||||
const envPrefix = "env."
|
||||
if strings.HasPrefix(key, envPrefix) {
|
||||
val := os.Getenv(key[len(envPrefix):])
|
||||
return val, val != ""
|
||||
}
|
||||
|
||||
switch key {
|
||||
case "system.hostname":
|
||||
// OK if there is an error; just return empty string
|
||||
name, _ := os.Hostname()
|
||||
return name, true
|
||||
case "system.slash":
|
||||
return string(filepath.Separator), true
|
||||
case "system.os":
|
||||
return runtime.GOOS, true
|
||||
case "system.arch":
|
||||
return runtime.GOARCH, true
|
||||
}
|
||||
|
||||
return "", false
|
||||
}
|
||||
|
||||
// ReplacerCtxKey is the context key for a replacer.
|
||||
const ReplacerCtxKey CtxKey = "replacer"
|
||||
|
||||
const phOpen, phClose = "{", "}"
|
||||
const phOpen, phClose = '{', '}'
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user