mirror of https://github.com/docker/cli.git
90 lines
3.0 KiB
Go
90 lines
3.0 KiB
Go
/*
|
|
*
|
|
* Copyright 2020 gRPC authors.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
*/
|
|
|
|
// Package grpcutil provides a bunch of utility functions to be used across the
|
|
// gRPC codebase.
|
|
package grpcutil
|
|
|
|
import (
|
|
"strings"
|
|
|
|
"google.golang.org/grpc/resolver"
|
|
)
|
|
|
|
// split2 returns the values from strings.SplitN(s, sep, 2).
|
|
// If sep is not found, it returns ("", "", false) instead.
|
|
func split2(s, sep string) (string, string, bool) {
|
|
spl := strings.SplitN(s, sep, 2)
|
|
if len(spl) < 2 {
|
|
return "", "", false
|
|
}
|
|
return spl[0], spl[1], true
|
|
}
|
|
|
|
// ParseTarget splits target into a resolver.Target struct containing scheme,
|
|
// authority and endpoint. skipUnixColonParsing indicates that the parse should
|
|
// not parse "unix:[path]" cases. This should be true in cases where a custom
|
|
// dialer is present, to prevent a behavior change.
|
|
//
|
|
// If target is not a valid scheme://authority/endpoint as specified in
|
|
// https://github.com/grpc/grpc/blob/master/doc/naming.md,
|
|
// it returns {Endpoint: target}.
|
|
func ParseTarget(target string, skipUnixColonParsing bool) (ret resolver.Target) {
|
|
var ok bool
|
|
if strings.HasPrefix(target, "unix-abstract:") {
|
|
if strings.HasPrefix(target, "unix-abstract://") {
|
|
// Maybe, with Authority specified, try to parse it
|
|
var remain string
|
|
ret.Scheme, remain, _ = split2(target, "://")
|
|
ret.Authority, ret.Endpoint, ok = split2(remain, "/")
|
|
if !ok {
|
|
// No Authority, add the "//" back
|
|
ret.Endpoint = "//" + remain
|
|
} else {
|
|
// Found Authority, add the "/" back
|
|
ret.Endpoint = "/" + ret.Endpoint
|
|
}
|
|
} else {
|
|
// Without Authority specified, split target on ":"
|
|
ret.Scheme, ret.Endpoint, _ = split2(target, ":")
|
|
}
|
|
return ret
|
|
}
|
|
ret.Scheme, ret.Endpoint, ok = split2(target, "://")
|
|
if !ok {
|
|
if strings.HasPrefix(target, "unix:") && !skipUnixColonParsing {
|
|
// Handle the "unix:[local/path]" and "unix:[/absolute/path]" cases,
|
|
// because splitting on :// only handles the
|
|
// "unix://[/absolute/path]" case. Only handle if the dialer is nil,
|
|
// to avoid a behavior change with custom dialers.
|
|
return resolver.Target{Scheme: "unix", Endpoint: target[len("unix:"):]}
|
|
}
|
|
return resolver.Target{Endpoint: target}
|
|
}
|
|
ret.Authority, ret.Endpoint, ok = split2(ret.Endpoint, "/")
|
|
if !ok {
|
|
return resolver.Target{Endpoint: target}
|
|
}
|
|
if ret.Scheme == "unix" {
|
|
// Add the "/" back in the unix case, so the unix resolver receives the
|
|
// actual endpoint in the "unix://[/absolute/path]" case.
|
|
ret.Endpoint = "/" + ret.Endpoint
|
|
}
|
|
return ret
|
|
}
|