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Make expression parser goroutine-safe.

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See https://github.com/prometheus/prometheus/issues/127
This commit is contained in:
Julius Volz 2013-04-10 19:08:14 +02:00
parent dd4f326680
commit 9a81b9838f
1 changed files with 10 additions and 5 deletions
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15
rules/load.go
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@ -20,14 +20,16 @@ import (
"io"
"os"
"strings"
"sync"
)
// NOTE: This parser is non-reentrant due to its dependence on global state.
// GoLex sadly needs these global variables for storing temporary token/parsing information.
var yylval *yySymType // For storing extra token information, like the contents of a string.
var yyline int // Line number within the current file or buffer.
var yypos int // Character position within the current line.
var (
yylval *yySymType // For storing extra token information, like the contents of a string.
yyline int // Line number within the current file or buffer.
yypos int // Character position within the current line.
parseMutex sync.Mutex // Mutex protecting the parsing-related global state defined above.
)
type RulesLexer struct {
errors []string // Errors encountered during parsing.
@ -58,6 +60,9 @@ func (lexer *RulesLexer) Error(errorStr string) {
}
func LoadFromReader(rulesReader io.Reader, singleExpr bool) (interface{}, error) {
parseMutex.Lock()
defer parseMutex.Unlock()
yyin = rulesReader
yypos = 1
yyline = 1