/
opts.go
209 lines (179 loc) · 5.72 KB
/
opts.go
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package swarm
import (
"encoding/csv"
"errors"
"fmt"
"strings"
"time"
"github.com/docker/docker/api/types/swarm"
"github.com/docker/docker/opts"
"github.com/spf13/pflag"
)
const (
defaultListenAddr = "0.0.0.0:2377"
flagCertExpiry = "cert-expiry"
flagDispatcherHeartbeat = "dispatcher-heartbeat"
flagListenAddr = "listen-addr"
flagAdvertiseAddr = "advertise-addr"
flagQuiet = "quiet"
flagRotate = "rotate"
flagToken = "token"
flagTaskHistoryLimit = "task-history-limit"
flagExternalCA = "external-ca"
flagMaxSnapshots = "max-snapshots"
flagSnapshotInterval = "snapshot-interval"
flagLockKey = "lock-key"
flagAutolock = "autolock"
)
type swarmOptions struct {
taskHistoryLimit int64
dispatcherHeartbeat time.Duration
nodeCertExpiry time.Duration
externalCA ExternalCAOption
maxSnapshots uint64
snapshotInterval uint64
autolock bool
}
// NodeAddrOption is a pflag.Value for listening addresses
type NodeAddrOption struct {
addr string
}
// String prints the representation of this flag
func (a *NodeAddrOption) String() string {
return a.Value()
}
// Set the value for this flag
func (a *NodeAddrOption) Set(value string) error {
addr, err := opts.ParseTCPAddr(value, a.addr)
if err != nil {
return err
}
a.addr = addr
return nil
}
// Type returns the type of this flag
func (a *NodeAddrOption) Type() string {
return "node-addr"
}
// Value returns the value of this option as addr:port
func (a *NodeAddrOption) Value() string {
return strings.TrimPrefix(a.addr, "tcp://")
}
// NewNodeAddrOption returns a new node address option
func NewNodeAddrOption(addr string) NodeAddrOption {
return NodeAddrOption{addr}
}
// NewListenAddrOption returns a NodeAddrOption with default values
func NewListenAddrOption() NodeAddrOption {
return NewNodeAddrOption(defaultListenAddr)
}
// ExternalCAOption is a Value type for parsing external CA specifications.
type ExternalCAOption struct {
values []*swarm.ExternalCA
}
// Set parses an external CA option.
func (m *ExternalCAOption) Set(value string) error {
parsed, err := parseExternalCA(value)
if err != nil {
return err
}
m.values = append(m.values, parsed)
return nil
}
// Type returns the type of this option.
func (m *ExternalCAOption) Type() string {
return "external-ca"
}
// String returns a string repr of this option.
func (m *ExternalCAOption) String() string {
externalCAs := []string{}
for _, externalCA := range m.values {
repr := fmt.Sprintf("%s: %s", externalCA.Protocol, externalCA.URL)
externalCAs = append(externalCAs, repr)
}
return strings.Join(externalCAs, ", ")
}
// Value returns the external CAs
func (m *ExternalCAOption) Value() []*swarm.ExternalCA {
return m.values
}
// parseExternalCA parses an external CA specification from the command line,
// such as protocol=cfssl,url=https://example.com.
func parseExternalCA(caSpec string) (*swarm.ExternalCA, error) {
csvReader := csv.NewReader(strings.NewReader(caSpec))
fields, err := csvReader.Read()
if err != nil {
return nil, err
}
externalCA := swarm.ExternalCA{
Options: make(map[string]string),
}
var (
hasProtocol bool
hasURL bool
)
for _, field := range fields {
parts := strings.SplitN(field, "=", 2)
if len(parts) != 2 {
return nil, fmt.Errorf("invalid field '%s' must be a key=value pair", field)
}
key, value := parts[0], parts[1]
switch strings.ToLower(key) {
case "protocol":
hasProtocol = true
if strings.ToLower(value) == string(swarm.ExternalCAProtocolCFSSL) {
externalCA.Protocol = swarm.ExternalCAProtocolCFSSL
} else {
return nil, fmt.Errorf("unrecognized external CA protocol %s", value)
}
case "url":
hasURL = true
externalCA.URL = value
default:
externalCA.Options[key] = value
}
}
if !hasProtocol {
return nil, errors.New("the external-ca option needs a protocol= parameter")
}
if !hasURL {
return nil, errors.New("the external-ca option needs a url= parameter")
}
return &externalCA, nil
}
func addSwarmFlags(flags *pflag.FlagSet, opts *swarmOptions) {
flags.Int64Var(&opts.taskHistoryLimit, flagTaskHistoryLimit, 5, "Task history retention limit")
flags.DurationVar(&opts.dispatcherHeartbeat, flagDispatcherHeartbeat, time.Duration(5*time.Second), "Dispatcher heartbeat period (ns|us|ms|s|m|h)")
flags.DurationVar(&opts.nodeCertExpiry, flagCertExpiry, time.Duration(90*24*time.Hour), "Validity period for node certificates (ns|us|ms|s|m|h)")
flags.Var(&opts.externalCA, flagExternalCA, "Specifications of one or more certificate signing endpoints")
flags.Uint64Var(&opts.maxSnapshots, flagMaxSnapshots, 0, "Number of additional Raft snapshots to retain")
flags.Uint64Var(&opts.snapshotInterval, flagSnapshotInterval, 10000, "Number of log entries between Raft snapshots")
}
func (opts *swarmOptions) mergeSwarmSpec(spec *swarm.Spec, flags *pflag.FlagSet) {
if flags.Changed(flagTaskHistoryLimit) {
spec.Orchestration.TaskHistoryRetentionLimit = &opts.taskHistoryLimit
}
if flags.Changed(flagDispatcherHeartbeat) {
spec.Dispatcher.HeartbeatPeriod = opts.dispatcherHeartbeat
}
if flags.Changed(flagCertExpiry) {
spec.CAConfig.NodeCertExpiry = opts.nodeCertExpiry
}
if flags.Changed(flagExternalCA) {
spec.CAConfig.ExternalCAs = opts.externalCA.Value()
}
if flags.Changed(flagMaxSnapshots) {
spec.Raft.KeepOldSnapshots = &opts.maxSnapshots
}
if flags.Changed(flagSnapshotInterval) {
spec.Raft.SnapshotInterval = opts.snapshotInterval
}
if flags.Changed(flagAutolock) {
spec.EncryptionConfig.AutoLockManagers = opts.autolock
}
}
func (opts *swarmOptions) ToSpec(flags *pflag.FlagSet) swarm.Spec {
var spec swarm.Spec
opts.mergeSwarmSpec(&spec, flags)
return spec
}