github.com/uber/kraken@v0.1.4/lib/persistedretry/tagreplication/remotes.go (about)

     1  // Copyright (c) 2016-2019 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  package tagreplication
    15  
    16  import (
    17  	"fmt"
    18  	"regexp"
    19  )
    20  
    21  // RemoteValidator validates remotes.
    22  type RemoteValidator interface {
    23  	Valid(tag, addr string) bool
    24  }
    25  
    26  // Remote represents a remote build-index.
    27  type Remote struct {
    28  	regexp *regexp.Regexp
    29  	addr   string
    30  }
    31  
    32  // Remotes represents all namespaces and their configured remote build-indexes.
    33  type Remotes []*Remote
    34  
    35  // Match returns all matched remotes for a tag.
    36  func (rs Remotes) Match(tag string) (addrs []string) {
    37  	for _, r := range rs {
    38  		if r.regexp.MatchString(tag) {
    39  			addrs = append(addrs, r.addr)
    40  		}
    41  	}
    42  	return addrs
    43  }
    44  
    45  // Valid returns true if tag matches to addr.
    46  func (rs Remotes) Valid(tag, addr string) bool {
    47  	for _, a := range rs.Match(tag) {
    48  		if a == addr {
    49  			return true
    50  		}
    51  	}
    52  	return false
    53  }
    54  
    55  // RemotesConfig defines remote replication configuration which specifies which
    56  // namespaces should be replicated to certain build-indexes.
    57  //
    58  // For example, given the configuration:
    59  //
    60  //   build-index-zone1:
    61  //   - namespace_foo/.*
    62  //
    63  //   build-index-zone2:
    64  //   - namespace_foo/.*
    65  //
    66  // Any builds matching the namespace_foo/.* namespace should be replicated to
    67  // zone1 and zone2 build-indexes.
    68  type RemotesConfig map[string][]string
    69  
    70  // Build builds configuration into Remotes.
    71  func (c RemotesConfig) Build() (Remotes, error) {
    72  	var remotes Remotes
    73  	for addr, namespaces := range c {
    74  		for _, ns := range namespaces {
    75  			re, err := regexp.Compile(ns)
    76  			if err != nil {
    77  				return nil, fmt.Errorf("regexp compile namespace %s: %s", ns, err)
    78  			}
    79  			remotes = append(remotes, &Remote{re, addr})
    80  		}
    81  	}
    82  	return remotes, nil
    83  }