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words.go
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words.go
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package main
import (
"fmt"
"net/http"
"strings"
"google.golang.org/appengine"
"google.golang.org/appengine/datastore"
)
func init() {
http.HandleFunc("/", handleWords)
}
type Word struct {
Term string
Definition string
}
func handleWords(res http.ResponseWriter, req *http.Request) {
if req.URL.Path != "/" {
term := strings.Split(req.URL.Path, "/")[1]
showWord(res, req, term)
return
}
if req.Method == "POST" {
saveWord(res, req)
return
}
listWords(res, req)
}
func listWords(res http.ResponseWriter, req *http.Request) {
ctx := appengine.NewContext(req)
q := datastore.NewQuery("Word").Order("Term")
html := ""
iterator := q.Run(ctx)
for {
var entity Word
_, err := iterator.Next(&entity)
if err == datastore.Done {
break
} else if err != nil {
http.Error(res, err.Error(), 500)
return
}
html += `
<dt>` + entity.Term + `</dt>
<dd>` + entity.Definition + `</dd>
`
}
res.Header().Set("Content-Type", "text/html")
fmt.Fprintln(res, `
<dl>
`+html+`
</dl>
<form method="POST">
<input type="text" name="term">
<textarea name="definition"></textarea>
<input type="submit">
</form>
`)
}
func showWord(res http.ResponseWriter, req *http.Request, term string) {
ctx := appengine.NewContext(req)
key := datastore.NewKey(ctx, "Word", term, 0, nil)
var entity Word
err := datastore.Get(ctx, key, &entity)
if err == datastore.ErrNoSuchEntity {
http.NotFound(res, req)
return
} else if err != nil {
http.Error(res, err.Error(), 500)
return
}
res.Header().Set("Content-Type", "text/html")
fmt.Fprintln(res, `
<dl>
<dt>`+entity.Term+`</dt>
<dd>`+entity.Definition+`</dd>
</dl>
`)
}
func saveWord(res http.ResponseWriter, req *http.Request) {
term := req.FormValue("term")
definition := req.FormValue("definition")
ctx := appengine.NewContext(req)
key := datastore.NewKey(ctx, "Word", term, 0, nil)
entity := Word{
Term: term,
Definition: definition,
}
_, err := datastore.Put(ctx, key, &entity)
if err != nil {
http.Error(res, err.Error(), 500)
return
}
http.Redirect(res, req, "/", 302)
}