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render.go
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render.go
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package znet
import (
"bytes"
"encoding/json"
"fmt"
"html/template"
"io/ioutil"
"mime"
"net/http"
"os"
"path/filepath"
"strings"
"github.com/sohaha/zlsgo/zfile"
"github.com/sohaha/zlsgo/zstring"
"github.com/sohaha/zlsgo/zutil"
)
type (
render interface {
Content(c *Context) (content []byte)
}
renderByte struct {
Data []byte
Type string
ContentDate []byte
}
renderString struct {
Format string
Data []interface{}
ContentDate []byte
}
renderJSON struct {
Data interface{}
ContentDate []byte
}
renderFile struct {
Data string
ContentDate []byte
FileExist bool
}
renderHTML struct {
Template *template.Template
Data interface{}
ContentDate []byte
FuncMap template.FuncMap
Templates []string
}
// ApiData unified return api format
ApiData struct {
Data interface{} `json:"data"`
Msg string `json:"msg,omitempty"`
Code int32 `json:"code" example:"200"`
}
// Data map string
Data map[string]interface{}
PrevData struct {
Code *zutil.Int32
Type string
Content []byte
}
)
var (
// ContentTypePlain text
ContentTypePlain = "text/plain; charset=utf-8"
// ContentTypeHTML html
ContentTypeHTML = "text/html; charset=utf-8"
// ContentTypeJSON json
ContentTypeJSON = "application/json; charset=utf-8"
)
func (c *Context) renderProcessing(code int32, r render) {
if c.stopHandle.Load() && c.prevData.Code.Load() != 0 {
return
}
c.prevData.Code.Store(code)
c.mu.Lock()
c.render = r
c.mu.Unlock()
}
func (r *renderByte) Content(c *Context) []byte {
if !c.hasContentType() {
c.SetContentType(ContentTypePlain)
}
return r.Data
}
func (r *renderString) Content(c *Context) []byte {
if r.ContentDate != nil {
return r.ContentDate
}
if !c.hasContentType() {
c.SetContentType(ContentTypePlain)
}
if len(r.Data) > 0 {
r.ContentDate = zstring.String2Bytes(fmt.Sprintf(r.Format, r.Data...))
} else {
r.ContentDate = zstring.String2Bytes(r.Format)
}
return r.ContentDate
}
func (r *renderJSON) Content(c *Context) []byte {
if r.ContentDate != nil {
return r.ContentDate
}
c.SetContentType(ContentTypeJSON)
r.ContentDate, _ = json.Marshal(r.Data)
return r.ContentDate
}
func (r *renderFile) Content(c *Context) []byte {
if !r.FileExist {
return []byte{}
}
if r.ContentDate != nil {
return r.ContentDate
}
fType := mime.TypeByExtension(filepath.Ext(r.Data))
c.SetContentType(fType)
r.ContentDate, _ = ioutil.ReadFile(r.Data)
return r.ContentDate
}
func (r *renderHTML) Content(c *Context) []byte {
if r.ContentDate != nil {
return r.ContentDate
}
c.SetContentType(ContentTypeHTML)
if len(r.Templates) > 0 {
var (
buf bytes.Buffer
err error
t *template.Template
)
if c.Engine.views != nil {
err = c.Engine.views.Render(&buf, r.Templates[0], r.Data)
} else {
tpl := c.Engine.template
if tpl != nil {
t = tpl.Get(c.Engine.IsDebug())
if t != nil && len(r.FuncMap) == 0 {
name := r.Templates[0]
err = t.ExecuteTemplate(&buf, name, r.Data)
if err == nil {
r.ContentDate = buf.Bytes()
return r.ContentDate
}
if !strings.Contains(err.Error(), " is undefined") {
Log.Error(err)
return r.ContentDate
}
}
}
if t, err = templateParse(r.Templates, r.FuncMap); err == nil {
err = t.Execute(&buf, r.Data)
}
}
if err != nil {
Log.Error(err)
}
r.ContentDate = buf.Bytes()
} else {
r.ContentDate = zstring.String2Bytes(fmt.Sprint(r.Data))
}
return r.ContentDate
}
func (c *Context) Byte(code int32, value []byte) {
c.renderProcessing(code, &renderByte{Data: value})
}
func (c *Context) String(code int32, format string, values ...interface{}) {
c.renderProcessing(code, &renderString{Format: format, Data: values})
}
// Deprecated: You can directly modify the return value of PrevContent()
func (c *Context) SetContent(data *PrevData) {
c.mu.Lock()
c.prevData = data
c.mu.Unlock()
}
func (c *Context) File(path string) {
path = zfile.RealPath(path)
f, err := os.Stat(path)
fileExist := err == nil
var code int32
if fileExist {
code = http.StatusOK
} else {
code = http.StatusNotFound
}
if fileExist {
c.SetHeader("Last-Modified", f.ModTime().UTC().Format("Mon, 02 Jan 2006 15:04:05 GMT"))
}
c.renderProcessing(code, &renderFile{Data: path, FileExist: fileExist})
}
func (c *Context) JSON(code int32, values interface{}) {
c.renderProcessing(code, &renderJSON{Data: values})
}
// ApiJSON ApiJSON
func (c *Context) ApiJSON(code int32, msg string, data interface{}) {
c.renderProcessing(http.StatusOK, &renderJSON{Data: ApiData{Code: code, Data: data,
Msg: msg}})
}
// HTML export html
func (c *Context) HTML(code int32, html string) {
c.renderProcessing(code, &renderHTML{
Data: html,
})
}
// Template export tpl
func (c *Context) Template(code int32, name string, data interface{}, funcMap ...map[string]interface{}) {
var fn template.FuncMap
if len(funcMap) > 0 {
fn = funcMap[0]
}
c.renderProcessing(code, &renderHTML{
Templates: []string{name},
Data: data,
FuncMap: fn,
})
}
func (c *Context) Templates(code int32, templates []string, data interface{}, funcMap ...map[string]interface{}) {
var fn template.FuncMap
if len(funcMap) > 0 {
fn = funcMap[0]
}
c.renderProcessing(code, &renderHTML{
Templates: templates,
Data: data,
FuncMap: fn,
})
}
// Abort stop executing subsequent handlers
func (c *Context) Abort(code ...int32) {
if c.stopHandle.Load() {
return
}
c.stopHandle.Store(true)
if len(code) > 0 {
c.prevData.Code.Store(code[0])
}
}
// Redirect Redirect
func (c *Context) Redirect(link string, statusCode ...int32) {
c.Writer.Header().Set("Location", c.CompletionLink(link))
var code int32
if len(statusCode) > 0 {
code = statusCode[0]
} else {
code = http.StatusFound
}
c.SetStatus(code)
}
func (c *Context) SetStatus(code int32) *Context {
c.prevData.Code.Store(code)
return c
}
func (c *Context) SetContentType(contentType string) *Context {
c.SetHeader("Content-Type", contentType)
return c
}
func (c *Context) hasContentType() bool {
c.mu.RLock()
defer c.mu.RUnlock()
if _, ok := c.header["Content-Type"]; ok {
return true
}
return false
}
// PrevContent current output content
func (c *Context) PrevContent() *PrevData {
if c.render == nil {
return c.prevData
}
c.prevData.Content = c.render.Content(c)
ctype, hasType := c.header["Content-Type"]
if hasType {
c.prevData.Type = ctype[0]
}
c.mu.Lock()
c.render = nil
c.mu.Unlock()
return c.prevData
}
func (t *tpl) Get(debug bool) *template.Template {
if !debug || t.pattern == "" {
return t.tpl
}
tpl, _ := template.New("").Funcs(t.templateFuncMap).ParseGlob(t.pattern)
return tpl
}