53 lines
1.1 KiB
Go
53 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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)
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// Parser keep tracks of the parsing
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type Parser struct {
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lines int // number of parsed lines (for the error messages)
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lerr error // the last error occurred
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}
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// Parsed wraps a result for generating a parser error
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type Parsed struct {
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result // use struct embedding
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err error // inject an error
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}
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// NewParser returns a new parser
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func NewParser() *Parser {
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return new(Parser)
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}
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// Parse parses a log line and returns a result with an injected error
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func (p *Parser) Parse(line string) (parsed Parsed) {
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// always set the error
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defer func() { parsed.err = p.lerr }()
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// if there was an error do not continue
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if p.lerr != nil {
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return
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}
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// chain the parser's error to the result's
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res, err := parse(line)
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if p.lines++; err != nil {
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p.lerr = fmt.Errorf("%s: (line #%d)", err, p.lines)
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}
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return Parsed{result: res}
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}
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// Err returns the last error encountered
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func (p *Parser) Err() error {
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return p.lerr
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}
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