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https://github.com/gopl-zh/gopl-zh.github.com.git
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61 lines
1.6 KiB
Go
61 lines
1.6 KiB
Go
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// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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// See page 348.
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// Search is a demo of the params.Unpack function.
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package main
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import (
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"fmt"
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"log"
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"net/http"
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)
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//!+
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import "gopl.io/ch12/params"
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// search implements the /search URL endpoint.
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func search(resp http.ResponseWriter, req *http.Request) {
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var data struct {
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Labels []string `http:"l"`
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MaxResults int `http:"max"`
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Exact bool `http:"x"`
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}
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data.MaxResults = 10 // set default
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if err := params.Unpack(req, &data); err != nil {
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http.Error(resp, err.Error(), http.StatusBadRequest) // 400
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return
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}
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// ...rest of handler...
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fmt.Fprintf(resp, "Search: %+v\n", data)
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}
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//!-
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func main() {
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http.HandleFunc("/search", search)
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log.Fatal(http.ListenAndServe(":12345", nil))
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}
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/*
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//!+output
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$ go build gopl.io/ch12/search
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$ ./search &
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$ ./fetch 'http://localhost:12345/search'
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Search: {Labels:[] MaxResults:10 Exact:false}
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$ ./fetch 'http://localhost:12345/search?l=golang&l=programming'
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Search: {Labels:[golang programming] MaxResults:10 Exact:false}
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$ ./fetch 'http://localhost:12345/search?l=golang&l=programming&max=100'
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Search: {Labels:[golang programming] MaxResults:100 Exact:false}
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$ ./fetch 'http://localhost:12345/search?x=true&l=golang&l=programming'
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Search: {Labels:[golang programming] MaxResults:10 Exact:true}
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$ ./fetch 'http://localhost:12345/search?q=hello&x=123'
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x: strconv.ParseBool: parsing "123": invalid syntax
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$ ./fetch 'http://localhost:12345/search?q=hello&max=lots'
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max: strconv.ParseInt: parsing "lots": invalid syntax
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//!-output
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*/
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