github.com/tcnksm/go@v0.0.0-20141208075154-439b32936367/doc/progs/error2.go (about)

     1  // compile
     2  
     3  // Copyright 2011 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // This file contains the code snippets included in "Error Handling and Go."
     8  
     9  package main
    10  
    11  import (
    12  	"net/http"
    13  	"text/template"
    14  )
    15  
    16  func init() {
    17  	http.HandleFunc("/view", viewRecord)
    18  }
    19  
    20  func viewRecord(w http.ResponseWriter, r *http.Request) {
    21  	c := appengine.NewContext(r)
    22  	key := datastore.NewKey(c, "Record", r.FormValue("id"), 0, nil)
    23  	record := new(Record)
    24  	if err := datastore.Get(c, key, record); err != nil {
    25  		http.Error(w, err.Error(), 500)
    26  		return
    27  	}
    28  	if err := viewTemplate.Execute(w, record); err != nil {
    29  		http.Error(w, err.Error(), 500)
    30  	}
    31  }
    32  
    33  // STOP OMIT
    34  
    35  type ap struct{}
    36  
    37  func (ap) NewContext(*http.Request) *ctx { return nil }
    38  
    39  type ctx struct{}
    40  
    41  func (*ctx) Errorf(string, ...interface{}) {}
    42  
    43  var appengine ap
    44  
    45  type ds struct{}
    46  
    47  func (ds) NewKey(*ctx, string, string, int, *int) string { return "" }
    48  func (ds) Get(*ctx, string, *Record) error               { return nil }
    49  
    50  var datastore ds
    51  
    52  type Record struct{}
    53  
    54  var viewTemplate *template.Template
    55  
    56  func main() {}