69 lines
1.1 KiB
Go
69 lines
1.1 KiB
Go
// 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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"os"
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"strings"
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)
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type resultFn func(result)
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type iterator interface {
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each(resultFn) error
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}
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type transformer interface {
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transform(result)
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iterator
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}
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type reporter interface {
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report(iterator) error
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}
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type pipeline struct {
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src iterator
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dst reporter
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tran transformer
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}
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func newPipeline(source iterator, r reporter, t transformer) *pipeline {
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return &pipeline{
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src: source,
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dst: r,
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tran: t,
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}
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}
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// fromFile generates a default report
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func fromFile(path string) (err error) {
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f, err := os.Open(path)
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if err != nil {
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return err
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}
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var src iterator
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switch {
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case strings.HasSuffix(path, ".txt"):
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src = newTextLog(f)
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case strings.HasSuffix(path, ".json"):
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src = newJSONLog(f)
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}
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p := newPipeline(src, newTextReport(), newAnalysis())
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return p.run()
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}
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func (p *pipeline) run() error {
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if err := p.src.each(p.tran.transform); err != nil {
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return err
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}
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return p.dst.report(p.tran)
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}
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