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package version
import (
"fmt"
"regexp"
"strings"
"sync"
)
var (
reRelease *regexp.Regexp
reDev *regexp.Regexp
reOnce sync.Once
uapCbs map[string]func() string
)
func UserAgent() string {
uaVersion := defaultVersion
reOnce.Do(func() {
reRelease = regexp.MustCompile(`^(v[0-9]+\.[0-9]+)\.[0-9]+$`)
reDev = regexp.MustCompile(`^(v[0-9]+\.[0-9]+)\.[0-9]+`)
})
if matches := reRelease.FindAllStringSubmatch(Version, 1); len(matches) > 0 {
uaVersion = matches[0][1]
} else if matches := reDev.FindAllStringSubmatch(Version, 1); len(matches) > 0 {
uaVersion = matches[0][1] + "-dev"
}
res := &strings.Builder{}
fmt.Fprintf(res, "buildkit/%s", uaVersion)
for pname, pver := range uapCbs {
fmt.Fprintf(res, " %s/%s", pname, pver())
}
return res.String()
}
// SetUserAgentProduct sets a callback to get the version of a product to be
// included in the User-Agent header. The callback is called every time the
// User-Agent header is generated. Caller must ensure that the callback is
// cached if it is expensive to compute.
func SetUserAgentProduct(name string, cb func() (version string)) {
if uapCbs == nil {
uapCbs = make(map[string]func() string)
}
uapCbs[name] = cb
}
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