mirror 
mirror suggests use of alternative functions/methods in order to gain performance boosts by avoiding unnecessary []byte/string conversion calls. See MIRROR_FUNCS.md list of mirror functions you can use in go's stdlib.
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Linter Use Cases
github.com/argoproj/argo-cd
// Before
func IsValidHostname(hostname string, fqdn bool) bool {
if !fqdn {
return validHostNameRegexp.Match([]byte(hostname)) || validIPv6Regexp.Match([]byte(hostname))
} else {
return validFQDNRegexp.Match([]byte(hostname))
}
}
// After: With alternative method (and lost `else` case)
func IsValidHostname(hostname string, fqdn bool) bool {
if !fqdn {
return validHostNameRegexp.MatchString(hostname) || validIPv6Regexp.MatchString(hostname)
}
return validFQDNRegexp.MatchString(hostname)
}Install
go install github.com/butuzov/mirror/cmd/mirror@latest
golangci-lint
golangci-lint supports mirror since v1.53.0
How to use
You run mirror with go vet:
go vet -vettool=$(which mirror) ./...
# github.com/jcmoraisjr/haproxy-ingress/pkg/common/net/ssl
pkg/common/net/ssl/ssl.go:64:11: avoid allocations with (*os.File).WriteString
pkg/common/net/ssl/ssl.go:161:12: avoid allocations with (*os.File).WriteString
pkg/common/net/ssl/ssl.go:166:3: avoid allocations with (*os.File).WriteString
Can be called directly:
mirror ./...
# https://github.com/cosmtrek/air
/air/runner/util.go:149:6: avoid allocations with (*regexp.Regexp).MatchString
/air/runner/util.go:173:14: avoid allocations with (*os.File).WriteString
With golangci-lint
golangci-lint run --no-config --disable-all -Emirror
# github.com/argoproj/argo-cd
test/e2e/fixture/app/actions.go:83:11: avoid allocations with (*os.File).WriteString (mirror)
_, err = tmpFile.Write([]byte(data))
^
server/server.go:1166:9: avoid allocations with (*regexp.Regexp).MatchString (mirror)
return mainJsBundleRegex.Match([]byte(filename))
^
server/account/account.go:91:6: avoid allocations with (*regexp.Regexp).MatchString (mirror)
if !validPasswordRegexp.Match([]byte(q.NewPassword)) {
^
server/badge/badge.go:52:20: avoid allocations with (*regexp.Regexp).FindAllStringSubmatchIndex (mirror)
for _, v := range re.FindAllSubmatchIndex([]byte(str), -1) {
^
util/cert/cert.go:82:10: avoid allocations with (*regexp.Regexp).MatchString (mirror)
return validHostNameRegexp.Match([]byte(hostname)) || validIPv6Regexp.Match([]byte(hostname))
Command line
- You can add checks for
_test.gofiles with cli option--with-tests
golangci-lint
With golangci-lint tests are checked by default and can be can be turned off by using the regular golangci-lint ways to do it:
- flag
--tests(e.g.--tests=false) - flag
--skip-files(e.g.--skip-files="_test.go") - yaml confguration
run.skip-files:run: skip-files: - '(.+)_test\.go'
- yaml confguration
issues.exclude-rules:issues: exclude-rules: - path: '(.+)_test\.go' linters: - mirror