remove: io iface
This commit is contained in:
Inanc Gumus
parent
b97d5f5da9
commit
fd66c9e996
@ -1,17 +0,0 @@
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[
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{
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"title": "moby dick",
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"price": 10,
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"released": 118281600
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},
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{
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"title": "odyssey",
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"price": 15,
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"released": 733622400
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},
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{
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"title": "hobbit",
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"price": 25,
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"released": -62135596800
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}
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]
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@ -1,59 +0,0 @@
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"encoding/json"
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"io"
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"io/ioutil"
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"os"
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)
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func encode() ([]byte, error) {
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l := list{
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{Title: "moby dick", Price: 10, Released: toTimestamp(118281600)},
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{Title: "odyssey", Price: 15, Released: toTimestamp("733622400")},
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{Title: "hobbit", Price: 25},
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}
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return json.MarshalIndent(l, "", "\t")
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}
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func decode(data []byte) (l list, _ error) {
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if err := json.Unmarshal(data, &l); err != nil {
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return nil, err
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}
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return
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}
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func decodeFile(path string) (list, error) {
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// ReadAll reads entire bytes from a file to memory.
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, err
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}
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return decode(data)
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}
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func decodeFileObject(f *os.File) (list, error) {
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data, err := ioutil.ReadAll(f)
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if err != nil {
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return nil, err
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}
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return decode(data)
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}
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func decodeReader(r io.Reader) (l list, err error) {
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// data, err := ioutil.ReadAll(r)
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// if err != nil {
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// return nil, err
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// }
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// return decode(data)
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return l, json.NewDecoder(r).Decode(&l)
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}
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@ -1,54 +0,0 @@
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"sort"
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"strings"
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)
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type list []*product
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func (l list) String() string {
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if len(l) == 0 {
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return "Sorry. We're waiting for delivery 🚚.\n"
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}
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var str strings.Builder
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for _, p := range l {
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// fmt.Printf("* %s\n", p)
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str.WriteString("* ")
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str.WriteString(p.String())
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str.WriteRune('\n')
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}
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return str.String()
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}
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func (l list) discount(ratio float64) {
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for _, p := range l {
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p.discount(ratio)
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}
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}
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// implementation of the sort.Interface:
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// by default `list` sorts by `title`.
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func (l list) Len() int { return len(l) }
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func (l list) Less(i, j int) bool { return l[i].Title < l[j].Title }
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func (l list) Swap(i, j int) { l[i], l[j] = l[j], l[i] }
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// byRelease sorts by product release dates.
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type byRelease struct{ list }
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func (bp byRelease) Less(i, j int) bool {
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return bp.list[i].Released.Before(bp.list[j].Released.Time)
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}
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func byReleaseDate(l list) sort.Interface {
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return byRelease{l}
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}
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@ -1,47 +0,0 @@
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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func main() {
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// removed error handling for brevity (normally you shouldn't do this).
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// encode to memory (to a byte slice)
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// out, _ := encode()
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// fmt.Println(string(out))
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// read from memory (from a byte slice):
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// l, _ := decode(out)
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// read from a file by name:
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// l, _ := decodeFile("database.json")
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// read from a file #1 (not good):
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// f, _ := os.Open("database.json")
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// l, _ := decodeFileObject(f)
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// f.Close()
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// read from a file #2 (better):
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// f, _ := os.Open("database.json")
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// l, _ := decodeReader(f)
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// f.Close()
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// read from memory (from a string):
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// const data = `[
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// { "title": "moby dick", "price": 10, "released": 118281600 },
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// { "title": "odyssey", "price": 15, "released": 733622400 },
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// { "title": "hobbit", "price": 25, "released": -62135596800 }
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// ]`
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// l, _ := decodeReader(strings.NewReader(data))
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// read from inanc's web server:
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// res, _ := http.Get("https://inancgumus.github.io/x/database.json")
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// l, _ := decodeReader(res.Body)
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// res.Body.Close()
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// fmt.Print(l)
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}
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@ -1,16 +0,0 @@
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import "fmt"
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type money float64
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func (m money) String() string {
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return fmt.Sprintf("$%.2f", m)
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}
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@ -1,26 +0,0 @@
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"fmt"
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)
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type product struct {
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Title string `json:"title"`
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Price money `json:"price"`
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Released timestamp `json:"released"`
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}
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func (p *product) String() string {
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return fmt.Sprintf("%s: %s (%s)", p.Title, p.Price, p.Released)
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}
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func (p *product) discount(ratio float64) {
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p.Price *= money(1 - ratio)
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}
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@ -1,50 +0,0 @@
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"strconv"
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"time"
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)
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type timestamp struct {
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time.Time
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}
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func (ts timestamp) String() string {
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if ts.IsZero() {
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return "unknown"
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}
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// Mon Jan 2 15:04:05 -0700 MST 2006
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const layout = "2006/01"
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return ts.Format(layout)
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}
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func (ts *timestamp) UnmarshalJSON(data []byte) error {
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*ts = toTimestamp(string(data))
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return nil
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}
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func (ts timestamp) MarshalJSON() (out []byte, _ error) {
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return strconv.AppendInt(out, ts.Unix(), 10), nil
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}
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func toTimestamp(v interface{}) (ts timestamp) {
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var t int
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switch v := v.(type) {
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case int:
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t = v
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case string:
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t, _ = strconv.Atoi(v)
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}
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ts.Time = time.Unix(int64(t), 0)
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return ts
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}
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@ -1,17 +0,0 @@
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[
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{
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"title": "moby dick",
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"price": 10,
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"released": 118281600
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},
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{
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"title": "odyssey",
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"price": 15,
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"released": 733622400
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},
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{
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"title": "hobbit",
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"price": 25,
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"released": -62135596800
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}
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]
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Binary file not shown.
@ -1,59 +0,0 @@
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"encoding/json"
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"io"
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"io/ioutil"
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"os"
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)
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func encode() ([]byte, error) {
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l := list{
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{Title: "moby dick", Price: 10, Released: toTimestamp(118281600)},
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{Title: "odyssey", Price: 15, Released: toTimestamp("733622400")},
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{Title: "hobbit", Price: 25},
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}
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return json.MarshalIndent(l, "", "\t")
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}
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func decode(data []byte) (l list, _ error) {
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if err := json.Unmarshal(data, &l); err != nil {
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return nil, err
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}
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return
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}
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func decodeFile(path string) (list, error) {
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// ReadAll reads entire bytes from a file to memory.
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return nil, err
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}
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return decode(data)
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}
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func decodeFileObject(f *os.File) (list, error) {
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data, err := ioutil.ReadAll(f)
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if err != nil {
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return nil, err
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}
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return decode(data)
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}
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func decodeReader(r io.Reader) (l list, err error) {
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// data, err := ioutil.ReadAll(r)
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// if err != nil {
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// return nil, err
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// }
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// return decode(data)
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return l, json.NewDecoder(r).Decode(&l)
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}
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@ -1,54 +0,0 @@
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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import (
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"sort"
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"strings"
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)
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type list []*product
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func (l list) String() string {
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if len(l) == 0 {
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return "Sorry. We're waiting for delivery 🚚.\n"
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}
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var str strings.Builder
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for _, p := range l {
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// fmt.Printf("* %s\n", p)
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str.WriteString("* ")
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str.WriteString(p.String())
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str.WriteRune('\n')
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}
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return str.String()
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}
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func (l list) discount(ratio float64) {
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for _, p := range l {
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p.discount(ratio)
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}
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}
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// implementation of the sort.Interface:
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// by default `list` sorts by `title`.
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func (l list) Len() int { return len(l) }
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func (l list) Less(i, j int) bool { return l[i].Title < l[j].Title }
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func (l list) Swap(i, j int) { l[i], l[j] = l[j], l[i] }
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// byRelease sorts by product release dates.
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type byRelease struct{ list }
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func (bp byRelease) Less(i, j int) bool {
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return bp.list[i].Released.Before(bp.list[j].Released.Time)
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}
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func byReleaseDate(l list) sort.Interface {
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return byRelease{l}
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}
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@ -1,82 +0,0 @@
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// For more tutorials: https://blog.learngoprogramming.com
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//
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// Copyright © 2018 Inanc Gumus
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// Learn Go Programming Course
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
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//
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package main
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// compress in bash:
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// gzip -k database.json
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func main() {
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// removed error handling and x.Close() calls for brevity (normally you shouldn't do this).
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// normally: fr.Close(), gr.Close() should also be called to release the resources.
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// data, _ := ioutil.ReadFile("database.json")
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// l, _ := decode(data)
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// fmt.Print(string(data))
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// fmt.Print(l)
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// ---
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// fr, _ := os.Open("database.json")
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// tr := TeeReader(fr, os.Stdout)
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// l, _ := decodeReader(tr)
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// fmt.Print(l)
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// ---
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// fr, _ := os.Open("database.json.gz")
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// gr, _ := gzip.NewReader(fr)
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// tr := TeeReader(gr, os.Stdout)
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// l, _ := decodeReader(tr)
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// fmt.Print(l)
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// ---
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// TODO: FIX
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// l, err := decodeGzip("database.json.gz", os.Stdout)
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// l, err := decodeGzip("database.json.gz", ioutil.Discard)
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// if err != nil {
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// log.Fatalln(err)
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// }
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// fmt.Print("Products:\n", l)
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}
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// func decodeGzipFile(path string) (list, error) {
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// fr, err := os.Open("database.json.gz")
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// if err != nil {
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// return nil, err
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// }
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// defer fr.Close()
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// return decodeGzip(fr)
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// }
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// func decodeGzip(r io.Reader, w io.Writer) (list, error) {
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// fr, err := os.Open("database.json.gz")
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// if err != nil {
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// return nil, err
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// }
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// gr, err := gzip.NewReader(fr)
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// if err != nil {
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// fr.Close()
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// return nil, err
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// }
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// tr := TeeReader(gr, w)
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// l, err := decodeReader(tr)
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// if err != nil {
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// fr.Close()
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// gr.Close()
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// return nil, err
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// }
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// fr.Close()
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// gr.Close()
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// return l, nil
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// }
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@ -1,16 +0,0 @@
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// For more tutorials: https://blog.learngoprogramming.com
|
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//
|
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// Copyright © 2018 Inanc Gumus
|
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// Learn Go Programming Course
|
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// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
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//
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|
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package main
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import "fmt"
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|
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type money float64
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|
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func (m money) String() string {
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return fmt.Sprintf("$%.2f", m)
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}
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@ -1,26 +0,0 @@
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// For more tutorials: https://blog.learngoprogramming.com
|
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//
|
||||
// Copyright © 2018 Inanc Gumus
|
||||
// Learn Go Programming Course
|
||||
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
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//
|
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|
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package main
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import (
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"fmt"
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)
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|
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type product struct {
|
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Title string `json:"title"`
|
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Price money `json:"price"`
|
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Released timestamp `json:"released"`
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}
|
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|
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func (p *product) String() string {
|
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return fmt.Sprintf("%s: %s (%s)", p.Title, p.Price, p.Released)
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}
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|
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func (p *product) discount(ratio float64) {
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p.Price *= money(1 - ratio)
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}
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@ -1,34 +0,0 @@
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// For more tutorials: https://blog.learngoprogramming.com
|
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//
|
||||
// Copyright © 2018 Inanc Gumus
|
||||
// Learn Go Programming Course
|
||||
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
||||
//
|
||||
|
||||
package main
|
||||
|
||||
import "io"
|
||||
|
||||
// TeeReader returns a Reader that writes to w what it reads from r.
|
||||
// All reads from r performed through it are matched with
|
||||
// corresponding writes to w. There is no internal buffering -
|
||||
// the write must complete before the read completes.
|
||||
// Any error encountered while writing is reported as a read error.
|
||||
func TeeReader(r io.Reader, w io.Writer) io.Reader {
|
||||
return &teeReader{r, w}
|
||||
}
|
||||
|
||||
type teeReader struct {
|
||||
r io.Reader
|
||||
w io.Writer
|
||||
}
|
||||
|
||||
func (t *teeReader) Read(p []byte) (n int, err error) {
|
||||
n, err = t.r.Read(p)
|
||||
if n > 0 {
|
||||
if n, err := t.w.Write(p[:n]); err != nil {
|
||||
return n, err
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
@ -1,50 +0,0 @@
|
||||
// For more tutorials: https://blog.learngoprogramming.com
|
||||
//
|
||||
// Copyright © 2018 Inanc Gumus
|
||||
// Learn Go Programming Course
|
||||
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
||||
//
|
||||
|
||||
package main
|
||||
|
||||
import (
|
||||
"strconv"
|
||||
"time"
|
||||
)
|
||||
|
||||
type timestamp struct {
|
||||
time.Time
|
||||
}
|
||||
|
||||
func (ts timestamp) String() string {
|
||||
if ts.IsZero() {
|
||||
return "unknown"
|
||||
}
|
||||
|
||||
// Mon Jan 2 15:04:05 -0700 MST 2006
|
||||
const layout = "2006/01"
|
||||
return ts.Format(layout)
|
||||
}
|
||||
|
||||
func (ts *timestamp) UnmarshalJSON(data []byte) error {
|
||||
*ts = toTimestamp(string(data))
|
||||
return nil
|
||||
}
|
||||
|
||||
func (ts timestamp) MarshalJSON() (out []byte, _ error) {
|
||||
return strconv.AppendInt(out, ts.Unix(), 10), nil
|
||||
}
|
||||
|
||||
func toTimestamp(v interface{}) (ts timestamp) {
|
||||
var t int
|
||||
|
||||
switch v := v.(type) {
|
||||
case int:
|
||||
t = v
|
||||
case string:
|
||||
t, _ = strconv.Atoi(v)
|
||||
}
|
||||
|
||||
ts.Time = time.Unix(int64(t), 0)
|
||||
return ts
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user