67 lines
1.1 KiB
Go
67 lines
1.1 KiB
Go
// For more tutorials: https://bp.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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"bufio"
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"fmt"
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"io"
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"strconv"
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"strings"
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)
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type textLog struct {
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reader io.Reader
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}
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func newTextLog(r io.Reader) *textLog {
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return &textLog{reader: r}
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}
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func (p *textLog) each(yield resultFn) error {
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defer readClose(p.reader)
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var (
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l = 1
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in = bufio.NewScanner(p.reader)
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)
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for in.Scan() {
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r, err := extractFields(in.Text())
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if err != nil {
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return fmt.Errorf("line %d: %v", l, err)
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}
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yield(r)
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l++
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}
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return in.Err()
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}
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func extractFields(s string) (r result, err error) {
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fields := strings.Fields(s)
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if len(fields) != fieldsLength {
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return r, fmt.Errorf("wrong number of fields %q", fields)
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}
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r.domain, r.page = fields[0], fields[1]
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r.visits, err = strconv.Atoi(fields[2])
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if err != nil || r.visits < 0 {
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return r, fmt.Errorf("wrong input %q", fields[2])
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}
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r.uniques, err = strconv.Atoi(fields[3])
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if err != nil || r.uniques < 0 {
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return r, fmt.Errorf("wrong input %q", fields[3])
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}
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return r, nil
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}
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