52 lines
1.1 KiB
Go
52 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 metrics
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import (
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"fmt"
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"strconv"
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"strings"
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)
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// always put all the related things together as in here
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// result stores metrics for a domain
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// it uses the value mechanics,
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// because it doesn't have to update anything
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type result struct {
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Domain string
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Visits int
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// add more metrics if needed
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}
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// add adds the metrics of another Result to itself and returns a new Result
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func (r result) add(other result) result {
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return result{
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Domain: r.Domain,
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Visits: r.Visits + other.Visits,
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}
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}
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// parse parses a single log line
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func parse(line string) (parsed result, err error) {
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fields := strings.Fields(line)
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if len(fields) != 2 {
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err = fmt.Errorf("wrong input: %v", fields)
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return
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}
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parsed.Domain = fields[0]
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parsed.Visits, err = strconv.Atoi(fields[1])
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if parsed.Visits < 0 || err != nil {
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err = fmt.Errorf("wrong input: %q", fields[1])
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}
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return
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}
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