93 lines
1.9 KiB
Go
93 lines
1.9 KiB
Go
// 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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// For more tutorials : https://learngoprogramming.com
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// In-person training : https://www.linkedin.com/in/inancgumus/
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// Follow me on twitter: https://twitter.com/inancgumus
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package main
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import (
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"context"
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"fmt"
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"os"
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"strconv"
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"time"
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)
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// const
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// nil, string, int, float64, bool, comparison
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// variables
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// multiple short variables
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// assignment?
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// if
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// error handling
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// functions
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// returns
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// defer
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// struct
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// encoding/json
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// pointers
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// concurrency
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// select
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// chan receive
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// fmt
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// Printf
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// Sprintf
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// Errorf
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// net/http
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// Get
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// context/Context
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// TODO: convert fmt calls to log
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// TODO: you can make the fetcher a library and main package the user
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// TODO: you can generate an html for the ship details? template pkg.
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const timeout = 10 * time.Second
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func main() {
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args := os.Args[1:]
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quit("give me a film id", len(args) != 1)
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id, err := strconv.Atoi(args[0])
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quit("film id is incorrrect", err)
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ctx, cancel := context.WithTimeout(context.Background(), timeout)
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defer cancel()
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// TODO: print the ship details to a text file (or any io.Writer)
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film, err := fetchFilm(ctx, id)
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quit("Error occurred while fetching the film data", err)
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fmt.Println(film)
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// a channel also can be used to print as they come
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ships := make([]Starship, len(film.Starships))
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err = fetchStarships(ctx, film.Starships, ships)
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quit("Error occurred while fetching starships", err)
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fmt.Println("Ships used in the movie:")
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fmt.Println("------------------------")
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for _, ship := range ships {
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fmt.Println(ship)
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}
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}
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func quit(message string, cond interface{}) {
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var quit bool
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switch v := cond.(type) {
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case error:
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quit = true
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message += ": " + v.Error()
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case bool:
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quit = v
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}
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if quit {
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fmt.Fprintln(os.Stderr, message)
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os.Exit(1)
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}
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}
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