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package protocolversion
import (
"fmt"
"io"
)
// Header keys.
const (
HeaderClientApiProtocol = "client-api-protocol"
HeaderClientEntrypointProtocol = "client-entrypoint-protocol"
HeaderClientVersion = "client-version"
)
// ParseHeader parses header values containing minimum and current
// protocol version numbers. This returns an error if parsing fails for
// reason, including blank values.
func ParseHeader(v string) (uint32, uint32, error) {
var min, current uint32
n, err := fmt.Sscanf(v, "%d,%d", &min, ¤t)
if err == io.EOF {
n = 0
err = nil
}
if err != nil {
return 0, 0, err
}
if n != 2 {
return 0, 0, fmt.Errorf("protocol version header must be formatted <min>,<current>")
}
return min, current, nil
}
// EncodeHeader creates a valid header value for the protocol version headers.
func EncodeHeader(min, current uint32) string {
return fmt.Sprintf("%d,%d", min, current)
}
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