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doc: update codelab/wiki to Go 1.

Browse Source 
R=golang-dev, r, adg
CC=golang-dev
https://golang.org/cl/5683076
This commit is contained in:
Shenghou Ma 2012-02-25 01:09:05 +08:00
parent 27e07a2666
commit 52cd4c8610
9 changed files with 108 additions and 129 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
doc/codelab/wiki/Makefile
View File

@ -2,13 +2,9 @@
# Use of this source code is governed by a BSD-style # Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file. # license that can be found in the LICENSE file.
include ../../../src/Make.inc
all: index.html all: index.html
include ../../../src/Make.common CLEANFILES:=srcextract.bin htmlify.bin get.bin
CLEANFILES+=srcextract.bin htmlify.bin get.bin
index.html: wiki.html srcextract.bin htmlify.bin index.html: wiki.html srcextract.bin htmlify.bin
PATH=.:$$PATH awk '/^!/{system(substr($$0,2)); next} {print}' < wiki.html | tr -d '\r' > index.html PATH=.:$$PATH awk '/^!/{system(substr($$0,2)); next} {print}' < wiki.html | tr -d '\r' > index.html
@ -17,9 +13,8 @@ test: get.bin
bash ./test.sh bash ./test.sh
rm -f get.6 get.bin rm -f get.6 get.bin
%.bin: %.$O %.bin: %.go
$(LD) -o $@ $< go build -o $@ $^
%.$O: %.go
$(GC) $(GCFLAGS) $(GCIMPORTS) $*.go
clean:
rm -f $(CLEANFILES)

2
doc/codelab/wiki/final-noclosure.go
View File

@ -6,10 +6,10 @@ package main
import ( import (
"errors" "errors"
"html/template"
"io/ioutil" "io/ioutil"
"net/http" "net/http"
"regexp" "regexp"
"text/template"
) )
type Page struct { type Page struct {

2
doc/codelab/wiki/final-noerror.go
View File

@ -5,9 +5,9 @@
package main package main
import ( import (
"html/template"
"io/ioutil" "io/ioutil"
"net/http" "net/http"
"text/template"
) )
type Page struct { type Page struct {

4
doc/codelab/wiki/final-parsetemplate.go
View File

@ -5,10 +5,10 @@
package main package main
import ( import (
"html/template"
"io/ioutil" "io/ioutil"
"net/http" "net/http"
"regexp" "regexp"
"text/template"
) )
type Page struct { type Page struct {
@ -59,7 +59,7 @@ func saveHandler(w http.ResponseWriter, r *http.Request, title string) {
} }
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) { func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
t, err := template.ParseFiles(tmpl+".html", nil) t, err := template.ParseFiles(tmpl + ".html")
if err != nil { if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError) http.Error(w, err.Error(), http.StatusInternalServerError)
return return

4
doc/codelab/wiki/final-template.go
View File

@ -5,9 +5,9 @@
package main package main
import ( import (
"html/template"
"io/ioutil" "io/ioutil"
"net/http" "net/http"
"text/template"
) )
type Page struct { type Page struct {
@ -55,7 +55,7 @@ func saveHandler(w http.ResponseWriter, r *http.Request) {
} }
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) { func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
t, _ := template.ParseFiles(tmpl+".html", nil) t, _ := template.ParseFiles(tmpl + ".html")
t.Execute(w, p) t.Execute(w, p)
} }

2
doc/codelab/wiki/final.go
View File

@ -5,10 +5,10 @@
package main package main
import ( import (
"html/template"
"io/ioutil" "io/ioutil"
"net/http" "net/http"
"regexp" "regexp"
"text/template"
) )
type Page struct { type Page struct {

104
doc/codelab/wiki/index.html
View File

@ -6,8 +6,8 @@ Covered in this codelab:
</p> </p>
<ul> <ul>
<li>Creating a data structure with load and save methods</li> <li>Creating a data structure with load and save methods</li>
<li>Using the <code>http</code> package to build web applications <li>Using the <code>net/http</code> package to build web applications
<li>Using the <code>template</code> package to process HTML templates</li> <li>Using the <code>html/template</code> package to process HTML templates</li>
<li>Using the <code>regexp</code> package to validate user input</li> <li>Using the <code>regexp</code> package to validate user input</li>
<li>Using closures</li> <li>Using closures</li>
</ul> </ul>
@ -18,21 +18,18 @@ Assumed knowledge:
<ul> <ul>
<li>Programming experience</li> <li>Programming experience</li>
<li>Understanding of basic web technologies (HTTP, HTML)</li> <li>Understanding of basic web technologies (HTTP, HTML)</li>
<li>Some UNIX command-line knowledge</li> <li>Some UNIX/DOS command-line knowledge</li>
</ul> </ul>
<h2>Getting Started</h2> <h2>Getting Started</h2>
<p> <p>
At present, you need to have a Linux, OS X, or FreeBSD machine to run Go. If At present, you need to have a FreeBSD, Linux, OS X, or Windows machine to run Go.
you don't have access to one, you could set up a Linux Virtual Machine (using We will use <code>$</code> to represent the command prompt.
<a href="http://www.virtualbox.org/">VirtualBox</a> or similar) or a
<a href="http://www.google.com/search?q=virtual+private+server">Virtual
Private Server</a>.
</p> </p>
<p> <p>
Install Go (see the <a href="http://golang.org/doc/install.html">Installation Instructions</a>). Install Go (see the <a href="/doc/install.html">Installation Instructions</a>).
</p> </p>
<p> <p>
@ -40,8 +37,8 @@ Make a new directory for this codelab and cd to it:
</p> </p>
<pre> <pre>
$ mkdir ~/gowiki $ mkdir gowiki
$ cd ~/gowiki $ cd gowiki
</pre> </pre>
<p> <p>
@ -55,15 +52,13 @@ package main
import ( import (
"fmt" "fmt"
"io/ioutil" "io/ioutil"
"os"
) )
</pre> </pre>
<p> <p>
We import the <code>fmt</code>, <code>ioutil</code> and <code>os</code> We import the <code>fmt</code> and <code>ioutil</code> packages from the Go
packages from the Go standard library. Later, as we implement additional standard library. Later, as we implement additional functionality, we will
functionality, we will add more packages to this <code>import</code> add more packages to this <code>import</code> declaration.
declaration.
</p> </p>
<h2>Data Structures</h2> <h2>Data Structures</h2>
@ -84,8 +79,8 @@ type Page struct {
<p> <p>
The type <code>[]byte</code> means "a <code>byte</code> slice". The type <code>[]byte</code> means "a <code>byte</code> slice".
(See <a href="http://golang.org/doc/effective_go.html#slices">Effective Go</a> (See <a href="/doc/articles/slices_usage_and_internals.html">Slices: usage and
for more on slices.) internals</a> for more on slices.)
The <code>Body</code> element is a <code>[]byte</code> rather than The <code>Body</code> element is a <code>[]byte</code> rather than
<code>string</code> because that is the type expected by the <code>io</code> <code>string</code> because that is the type expected by the <code>io</code>
libraries we will use, as you'll see below. libraries we will use, as you'll see below.
@ -178,9 +173,8 @@ func loadPage(title string) (*Page, error) {
<p> <p>
Callers of this function can now check the second parameter; if it is Callers of this function can now check the second parameter; if it is
<code>nil</code> then it has successfully loaded a Page. If not, it will be an <code>nil</code> then it has successfully loaded a Page. If not, it will be an
<code>error</code> that can be handled by the caller (see the <a <code>error</code> that can be handled by the caller (see the
href="http://golang.org/pkg/os/#Error">os package documentation</a> for <a href="/doc/go_spec.html#Errors">language specification</a> for details).
details).
</p> </p>
<p> <p>
@ -210,23 +204,21 @@ You can compile and run the program like this:
</p> </p>
<pre> <pre>
$ 8g wiki.go $ go build wiki.go
$ 8l wiki.8 $ ./wiki
$ ./8.out
This is a sample page. This is a sample page.
</pre> </pre>
<p> <p>
(The <code>8g</code> and <code>8l</code> commands are applicable to (If you're using Windows you must type "<code>wiki</code>" without the
<code>GOARCH=386</code>. If you're on an <code>amd64</code> system, "<code>./</code>" to run the program.)
substitute 6's for the 8's.)
</p> </p>
<p> <p>
<a href="part1.go">Click here to view the code we've written so far.</a> <a href="part1.go">Click here to view the code we've written so far.</a>
</p> </p>
<h2>Introducing the <code>http</code> package (an interlude)</h2> <h2>Introducing the <code>net/http</code> package (an interlude)</h2>
<p> <p>
Here's a full working example of a simple web server: Here's a full working example of a simple web server:
@ -292,18 +284,17 @@ the program would present a page containing:
</p> </p>
<pre>Hi there, I love monkeys!</pre> <pre>Hi there, I love monkeys!</pre>
<h2>Using <code>http</code> to serve wiki pages</h2> <h2>Using <code>net/http</code> to serve wiki pages</h2>
<p> <p>
To use the <code>http</code> package, it must be imported: To use the <code>net/http</code> package, it must be imported:
</p> </p>
<pre> <pre>
import ( import (
"fmt" "fmt"
<b>"http"</b> <b>"net/http"</b>
"io/ioutil" "io/ioutil"
"os"
) )
</pre> </pre>
@ -361,14 +352,17 @@ func main() {
<p> <p>
Let's create some page data (as <code>test.txt</code>), compile our code, and Let's create some page data (as <code>test.txt</code>), compile our code, and
try serving a wiki page: try serving a wiki page.
</p>
<p>
Open <code>test.txt</code> file in your editor, and save the string "Hello world" (without quotes)
in it.
</p> </p>
<pre> <pre>
$ echo "Hello world" &gt; test.txt $ go build wiki.go
$ 8g wiki.go $ ./wiki
$ 8l wiki.8
$ ./8.out
</pre> </pre>
<p> <p>
@ -426,19 +420,17 @@ This function will work fine, but all that hard-coded HTML is ugly.
Of course, there is a better way. Of course, there is a better way.
</p> </p>
<h2>The <code>template</code> package</h2> <h2>The <code>html/template</code> package</h2>
<p> <p>
The <code>template</code> package is part of the Go standard library. The <code>html/template</code> package is part of the Go standard library.
(A new template package is coming; this code lab will be updated soon.) We can use <code>html/template</code> to keep the HTML in a separate file,
We can allowing us to change the layout of our edit page without modifying the
use <code>template</code> to keep the HTML in a separate file, allowing underlying Go code.
us to change the layout of our edit page without modifying the underlying Go
code.
</p> </p>
<p> <p>
First, we must add <code>template</code> to the list of imports: First, we must add <code>html/template</code> to the list of imports:
</p> </p>
<pre> <pre>
@ -446,7 +438,7 @@ import (
"http" "http"
"io/ioutil" "io/ioutil"
"os" "os"
<b>"template"</b> <b>"html/template"</b>
) )
</pre> </pre>
@ -482,7 +474,7 @@ func editHandler(w http.ResponseWriter, r *http.Request) {
</pre> </pre>
<p> <p>
The function <code>template.ParseFile</code> will read the contents of The function <code>template.ParseFiles</code> will read the contents of
<code>edit.html</code> and return a <code>*template.Template</code>. <code>edit.html</code> and return a <code>*template.Template</code>.
</p> </p>
@ -558,7 +550,7 @@ func editHandler(w http.ResponseWriter, r *http.Request) {
} }
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) { func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
t, _ := template.ParseFiles(tmpl+&#34;.html&#34;, nil) t, _ := template.ParseFiles(tmpl + &#34;.html&#34;)
t.Execute(w, p) t.Execute(w, p)
} }
</pre> </pre>
@ -570,10 +562,11 @@ The handlers are now shorter and simpler.
<h2>Handling non-existent pages</h2> <h2>Handling non-existent pages</h2>
<p> <p>
What if you visit <code>/view/APageThatDoesntExist</code>? The program will What if you visit <a href="http://localhost:8080/view/APageThatDoesntExist">
crash. This is because it ignores the error return value from <code>/view/APageThatDoesntExist</code></a>? The program will crash. This is
<code>loadPage</code>. Instead, if the requested Page doesn't exist, it should because it ignores the error return value from <code>loadPage</code>. Instead,
redirect the client to the edit Page so the content may be created: if the requested Page doesn't exist, it should redirect the client to the edit
Page so the content may be created:
</p> </p>
<pre> <pre>
@ -643,7 +636,7 @@ First, let's handle the errors in <code>renderTemplate</code>:
<pre> <pre>
func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) { func renderTemplate(w http.ResponseWriter, tmpl string, p *Page) {
t, err := template.ParseFiles(tmpl+&#34;.html&#34;, nil) t, err := template.ParseFiles(tmpl + &#34;.html&#34;)
if err != nil { if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError) http.Error(w, err.Error(), http.StatusInternalServerError)
return return
@ -976,9 +969,8 @@ Recompile the code, and run the app:
</p> </p>
<pre> <pre>
$ 8g wiki.go $ go build wiki.go
$ 8l wiki.8 $ ./wiki
$ ./8.out
</pre> </pre>
<p> <p>

4
doc/codelab/wiki/test.sh
View File

@ -8,10 +8,10 @@ cleanup() {
} }
trap cleanup 0 INT trap cleanup 0 INT
gomake get.bin make get.bin
addr=$(./get.bin -addr) addr=$(./get.bin -addr)
sed s/:8080/$addr/ < final.go > final-test.go sed s/:8080/$addr/ < final.go > final-test.go
gomake final-test.bin make final-test.bin
(./final-test.bin) & (./final-test.bin) &
wiki_pid=$! wiki_pid=$!

100
doc/codelab/wiki/wiki.html
View File

@ -6,8 +6,8 @@ Covered in this codelab:
</p> </p>
<ul> <ul>
<li>Creating a data structure with load and save methods</li> <li>Creating a data structure with load and save methods</li>
<li>Using the <code>http</code> package to build web applications <li>Using the <code>net/http</code> package to build web applications
<li>Using the <code>template</code> package to process HTML templates</li> <li>Using the <code>html/template</code> package to process HTML templates</li>
<li>Using the <code>regexp</code> package to validate user input</li> <li>Using the <code>regexp</code> package to validate user input</li>
<li>Using closures</li> <li>Using closures</li>
</ul> </ul>
@ -18,21 +18,18 @@ Assumed knowledge:
<ul> <ul>
<li>Programming experience</li> <li>Programming experience</li>
<li>Understanding of basic web technologies (HTTP, HTML)</li> <li>Understanding of basic web technologies (HTTP, HTML)</li>
<li>Some UNIX command-line knowledge</li> <li>Some UNIX/DOS command-line knowledge</li>
</ul> </ul>
<h2>Getting Started</h2> <h2>Getting Started</h2>
<p> <p>
At present, you need to have a Linux, OS X, or FreeBSD machine to run Go. If At present, you need to have a FreeBSD, Linux, OS X, or Windows machine to run Go.
you don't have access to one, you could set up a Linux Virtual Machine (using We will use <code>$</code> to represent the command prompt.
<a href="http://www.virtualbox.org/">VirtualBox</a> or similar) or a
<a href="http://www.google.com/search?q=virtual+private+server">Virtual
Private Server</a>.
</p> </p>
<p> <p>
Install Go (see the <a href="http://golang.org/doc/install.html">Installation Instructions</a>). Install Go (see the <a href="/doc/install.html">Installation Instructions</a>).
</p> </p>
<p> <p>
@ -40,8 +37,8 @@ Make a new directory for this codelab and cd to it:
</p> </p>
<pre> <pre>
$ mkdir ~/gowiki $ mkdir gowiki
$ cd ~/gowiki $ cd gowiki
</pre> </pre>
<p> <p>
@ -55,15 +52,13 @@ package main
import ( import (
"fmt" "fmt"
"io/ioutil" "io/ioutil"
"os"
) )
</pre> </pre>
<p> <p>
We import the <code>fmt</code>, <code>ioutil</code> and <code>os</code> We import the <code>fmt</code> and <code>ioutil</code> packages from the Go
packages from the Go standard library. Later, as we implement additional standard library. Later, as we implement additional functionality, we will
functionality, we will add more packages to this <code>import</code> add more packages to this <code>import</code> declaration.
declaration.
</p> </p>
<h2>Data Structures</h2> <h2>Data Structures</h2>
@ -81,8 +76,8 @@ the title and body.
<p> <p>
The type <code>[]byte</code> means "a <code>byte</code> slice". The type <code>[]byte</code> means "a <code>byte</code> slice".
(See <a href="http://golang.org/doc/effective_go.html#slices">Effective Go</a> (See <a href="/doc/articles/slices_usage_and_internals.html">Slices: usage and
for more on slices.) internals</a> for more on slices.)
The <code>Body</code> element is a <code>[]byte</code> rather than The <code>Body</code> element is a <code>[]byte</code> rather than
<code>string</code> because that is the type expected by the <code>io</code> <code>string</code> because that is the type expected by the <code>io</code>
libraries we will use, as you'll see below. libraries we will use, as you'll see below.
@ -161,9 +156,8 @@ function to return <code>*Page</code> and <code>error</code>.
<p> <p>
Callers of this function can now check the second parameter; if it is Callers of this function can now check the second parameter; if it is
<code>nil</code> then it has successfully loaded a Page. If not, it will be an <code>nil</code> then it has successfully loaded a Page. If not, it will be an
<code>error</code> that can be handled by the caller (see the <a <code>error</code> that can be handled by the caller (see the
href="http://golang.org/pkg/os/#Error">os package documentation</a> for <a href="/doc/go_spec.html#Errors">language specification</a> for details).
details).
</p> </p>
<p> <p>
@ -188,23 +182,21 @@ You can compile and run the program like this:
</p> </p>
<pre> <pre>
$ 8g wiki.go $ go build wiki.go
$ 8l wiki.8 $ ./wiki
$ ./8.out
This is a sample page. This is a sample page.
</pre> </pre>
<p> <p>
(The <code>8g</code> and <code>8l</code> commands are applicable to (If you're using Windows you must type "<code>wiki</code>" without the
<code>GOARCH=386</code>. If you're on an <code>amd64</code> system, "<code>./</code>" to run the program.)
substitute 6's for the 8's.)
</p> </p>
<p> <p>
<a href="part1.go">Click here to view the code we've written so far.</a> <a href="part1.go">Click here to view the code we've written so far.</a>
</p> </p>
<h2>Introducing the <code>http</code> package (an interlude)</h2> <h2>Introducing the <code>net/http</code> package (an interlude)</h2>
<p> <p>
Here's a full working example of a simple web server: Here's a full working example of a simple web server:
@ -256,18 +248,17 @@ the program would present a page containing:
</p> </p>
<pre>Hi there, I love monkeys!</pre> <pre>Hi there, I love monkeys!</pre>
<h2>Using <code>http</code> to serve wiki pages</h2> <h2>Using <code>net/http</code> to serve wiki pages</h2>
<p> <p>
To use the <code>http</code> package, it must be imported: To use the <code>net/http</code> package, it must be imported:
</p> </p>
<pre> <pre>
import ( import (
"fmt" "fmt"
<b>"http"</b> <b>"net/http"</b>
"io/ioutil" "io/ioutil"
"os"
) )
</pre> </pre>
@ -318,14 +309,17 @@ any requests under the path <code>/view/</code>.
<p> <p>
Let's create some page data (as <code>test.txt</code>), compile our code, and Let's create some page data (as <code>test.txt</code>), compile our code, and
try serving a wiki page: try serving a wiki page.
</p>
<p>
Open <code>test.txt</code> file in your editor, and save the string "Hello world" (without quotes)
in it.
</p> </p>
<pre> <pre>
$ echo "Hello world" &gt; test.txt $ go build wiki.go
$ 8g wiki.go $ ./wiki
$ 8l wiki.8
$ ./8.out
</pre> </pre>
<p> <p>
@ -366,19 +360,17 @@ This function will work fine, but all that hard-coded HTML is ugly.
Of course, there is a better way. Of course, there is a better way.
</p> </p>
<h2>The <code>template</code> package</h2> <h2>The <code>html/template</code> package</h2>
<p> <p>
The <code>template</code> package is part of the Go standard library. The <code>html/template</code> package is part of the Go standard library.
(A new template package is coming; this code lab will be updated soon.) We can use <code>html/template</code> to keep the HTML in a separate file,
We can allowing us to change the layout of our edit page without modifying the
use <code>template</code> to keep the HTML in a separate file, allowing underlying Go code.
us to change the layout of our edit page without modifying the underlying Go
code.
</p> </p>
<p> <p>
First, we must add <code>template</code> to the list of imports: First, we must add <code>html/template</code> to the list of imports:
</p> </p>
<pre> <pre>
@ -386,7 +378,7 @@ import (
"http" "http"
"io/ioutil" "io/ioutil"
"os" "os"
<b>"template"</b> <b>"html/template"</b>
) )
</pre> </pre>
@ -409,7 +401,7 @@ HTML:
</pre> </pre>
<p> <p>
The function <code>template.ParseFile</code> will read the contents of The function <code>template.ParseFiles</code> will read the contents of
<code>edit.html</code> and return a <code>*template.Template</code>. <code>edit.html</code> and return a <code>*template.Template</code>.
</p> </p>
@ -474,10 +466,11 @@ The handlers are now shorter and simpler.
<h2>Handling non-existent pages</h2> <h2>Handling non-existent pages</h2>
<p> <p>
What if you visit <code>/view/APageThatDoesntExist</code>? The program will What if you visit <a href="http://localhost:8080/view/APageThatDoesntExist">
crash. This is because it ignores the error return value from <code>/view/APageThatDoesntExist</code></a>? The program will crash. This is
<code>loadPage</code>. Instead, if the requested Page doesn't exist, it should because it ignores the error return value from <code>loadPage</code>. Instead,
redirect the client to the edit Page so the content may be created: if the requested Page doesn't exist, it should redirect the client to the edit
Page so the content may be created:
</p> </p>
<pre> <pre>
@ -753,9 +746,8 @@ Recompile the code, and run the app:
</p> </p>
<pre> <pre>
$ 8g wiki.go $ go build wiki.go
$ 8l wiki.8 $ ./wiki
$ ./8.out
</pre> </pre>
<p> <p>