70 lines
1.2 KiB
Go
70 lines
1.2 KiB
Go
package sentry
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import (
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"bytes"
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"os"
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"sync"
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)
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type sourceReader struct {
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mu sync.Mutex
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cache map[string][][]byte
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}
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func newSourceReader() sourceReader {
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return sourceReader{
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cache: make(map[string][][]byte),
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}
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}
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func (sr *sourceReader) readContextLines(filename string, line, context int) ([][]byte, int) {
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sr.mu.Lock()
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defer sr.mu.Unlock()
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lines, ok := sr.cache[filename]
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if !ok {
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data, err := os.ReadFile(filename)
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if err != nil {
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sr.cache[filename] = nil
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return nil, 0
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}
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lines = bytes.Split(data, []byte{'\n'})
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sr.cache[filename] = lines
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}
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return sr.calculateContextLines(lines, line, context)
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}
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func (sr *sourceReader) calculateContextLines(lines [][]byte, line, context int) ([][]byte, int) {
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// Stacktrace lines are 1-indexed, slices are 0-indexed
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line--
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// contextLine points to a line that caused an issue itself, in relation to
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// returned slice.
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contextLine := context
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if lines == nil || line >= len(lines) || line < 0 {
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return nil, 0
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}
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if context < 0 {
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context = 0
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contextLine = 0
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}
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start := line - context
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if start < 0 {
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contextLine += start
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start = 0
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}
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end := line + context + 1
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if end > len(lines) {
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end = len(lines)
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}
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return lines[start:end], contextLine
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}
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