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command/envoy: Refactor flag parsing/validation (#7504)

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This commit is contained in:
Daniel Nephin 2020-03-26 10:19:21 -04:00 committed by GitHub
parent 02cacf8128
commit 2569b2c6dd
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 198 additions and 81 deletions
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104
command/connect/envoy/envoy.go
View file

@ -11,6 +11,7 @@ import (
"strconv"
"strings"
"github.com/mitchellh/cli"
"github.com/mitchellh/mapstructure"
"github.com/hashicorp/consul/agent/structs"
@ -19,9 +20,6 @@ import (
proxyCmd "github.com/hashicorp/consul/command/connect/proxy"
"github.com/hashicorp/consul/command/flags"
"github.com/hashicorp/consul/ipaddr"
"github.com/hashicorp/go-sockaddr/template"
"github.com/mitchellh/cli"
)
func New(ui cli.Ui) *cmd {
@ -60,10 +58,10 @@ type cmd struct {
// mesh gateway registration information
register bool
address string
wanAddress string
lanAddress ServiceAddressValue
wanAddress ServiceAddressValue
deregAfterCritical string
bindAddresses map[string]string
bindAddresses ServiceAddressMapValue
exposeServers bool
meshGatewaySvcName string
@ -120,13 +118,13 @@ func (c *cmd) init() {
c.flags.BoolVar(&c.register, "register", false,
"Register a new Mesh Gateway service before configuring and starting Envoy")
c.flags.StringVar(&c.address, "address", "",
c.flags.Var(&c.lanAddress, "address",
"LAN address to advertise in the Mesh Gateway service registration")
c.flags.StringVar(&c.wanAddress, "wan-address", "",
c.flags.Var(&c.wanAddress, "wan-address",
"WAN address to advertise in the Mesh Gateway service registration")
c.flags.Var((*flags.FlagMapValue)(&c.bindAddresses), "bind-address", "Bind "+
c.flags.Var(&c.bindAddresses, "bind-address", "Bind "+
"address to use instead of the default binding rules given as `<name>=<ip>:<port>` "+
"pairs. This flag may be specified multiple times to add multiple bind addresses.")
@ -145,38 +143,6 @@ func (c *cmd) init() {
c.help = flags.Usage(help, c.flags)
}
const (
DefaultMeshGatewayPort int = 443
)
func parseAddress(addrStr string) (string, int, error) {
if addrStr == "" {
// defaulting the port to 443
return "", DefaultMeshGatewayPort, nil
}
x, err := template.Parse(addrStr)
if err != nil {
return "", DefaultMeshGatewayPort, fmt.Errorf("Error parsing address %q: %v", addrStr, err)
}
addr, portStr, err := net.SplitHostPort(x)
if err != nil {
return "", DefaultMeshGatewayPort, fmt.Errorf("Error parsing address %q: %v", x, err)
}
port := DefaultMeshGatewayPort
if portStr != "" {
port, err = strconv.Atoi(portStr)
if err != nil {
return "", DefaultMeshGatewayPort, fmt.Errorf("Error parsing port %q: %v", portStr, err)
}
}
return addr, port, nil
}
// canBindInternal is here mainly so we can unit test this with a constant net.Addr list
func canBindInternal(addr string, ifAddrs []net.Addr) bool {
if addr == "" {
@ -206,13 +172,13 @@ func canBindInternal(addr string, ifAddrs []net.Addr) bool {
return false
}
func canBind(addr string) bool {
func canBind(addr api.ServiceAddress) bool {
ifAddrs, err := net.InterfaceAddrs()
if err != nil {
return false
}
return canBindInternal(addr, ifAddrs)
return canBindInternal(addr.Address, ifAddrs)
}
func (c *cmd) Run(args []string) int {
@ -246,30 +212,18 @@ func (c *cmd) Run(args []string) int {
return 1
}
lanAddr, lanPort, err := parseAddress(c.address)
if err != nil {
c.UI.Error(fmt.Sprintf("Failed to parse the -address parameter: %v", err))
return 1
}
taggedAddrs := make(map[string]api.ServiceAddress)
if lanAddr != "" {
taggedAddrs[structs.TaggedAddressLAN] = api.ServiceAddress{Address: lanAddr, Port: lanPort}
lanAddr := c.lanAddress.Value()
if lanAddr.Address != "" {
taggedAddrs[structs.TaggedAddressLAN] = lanAddr
}
wanAddr := ""
wanPort := lanPort
if c.wanAddress != "" {
wanAddr, wanPort, err = parseAddress(c.wanAddress)
if err != nil {
c.UI.Error(fmt.Sprintf("Failed to parse the -wan-address parameter: %v", err))
return 1
}
taggedAddrs[structs.TaggedAddressWAN] = api.ServiceAddress{Address: wanAddr, Port: wanPort}
wanAddr := c.wanAddress.Value()
if wanAddr.Address != "" {
taggedAddrs[structs.TaggedAddressWAN] = wanAddr
}
tcpCheckAddr := lanAddr
tcpCheckAddr := lanAddr.Address
if tcpCheckAddr == "" {
// fallback to localhost as the gateway has to reside in the same network namespace
// as the agent
@ -278,24 +232,12 @@ func (c *cmd) Run(args []string) int {
var proxyConf *api.AgentServiceConnectProxyConfig
if len(c.bindAddresses) > 0 {
if len(c.bindAddresses.value) > 0 {
// override all default binding rules and just bind to the user-supplied addresses
bindAddresses := make(map[string]api.ServiceAddress)
for addrName, addrStr := range c.bindAddresses {
addr, port, err := parseAddress(addrStr)
if err != nil {
c.UI.Error(fmt.Sprintf("Failed to parse the bind address: %s=%s: %v", addrName, addrStr, err))
return 1
}
bindAddresses[addrName] = api.ServiceAddress{Address: addr, Port: port}
}
proxyConf = &api.AgentServiceConnectProxyConfig{
Config: map[string]interface{}{
"envoy_mesh_gateway_no_default_bind": true,
"envoy_mesh_gateway_bind_addresses": bindAddresses,
"envoy_mesh_gateway_bind_addresses": c.bindAddresses.value,
},
}
} else if canBind(lanAddr) && canBind(wanAddr) {
@ -307,8 +249,8 @@ func (c *cmd) Run(args []string) int {
"envoy_mesh_gateway_bind_tagged_addresses": true,
},
}
} else if !canBind(lanAddr) && lanAddr != "" {
c.UI.Error(fmt.Sprintf("The LAN address %q will not be bindable. Either set a bindable address or override the bind addresses with -bind-address", lanAddr))
} else if !canBind(lanAddr) && lanAddr.Address != "" {
c.UI.Error(fmt.Sprintf("The LAN address %q will not be bindable. Either set a bindable address or override the bind addresses with -bind-address", lanAddr.Address))
return 1
}
@ -320,14 +262,14 @@ func (c *cmd) Run(args []string) int {
svc := api.AgentServiceRegistration{
Kind: api.ServiceKindMeshGateway,
Name: c.meshGatewaySvcName,
Address: lanAddr,
Port: lanPort,
Address: lanAddr.Address,
Port: lanAddr.Port,
Meta: meta,
TaggedAddresses: taggedAddrs,
Proxy: proxyConf,
Check: &api.AgentServiceCheck{
Name: "Mesh Gateway Listening",
TCP: ipaddr.FormatAddressPort(tcpCheckAddr, lanPort),
TCP: ipaddr.FormatAddressPort(tcpCheckAddr, lanAddr.Port),
Interval: "10s",
DeregisterCriticalServiceAfter: c.deregAfterCritical,
},

95
command/connect/envoy/flags.go Normal file
View file

@ -0,0 +1,95 @@
package envoy
import (
"flag"
"fmt"
"net"
"strconv"
"strings"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/go-sockaddr/template"
)
const defaultMeshGatewayPort int = 443
// ServiceAddressValue implements a flag.Value that may be used to parse an
// addr:port string into an api.ServiceAddress.
type ServiceAddressValue struct {
value api.ServiceAddress
}
func (s *ServiceAddressValue) String() string {
if s == nil {
return fmt.Sprintf(":%d", defaultMeshGatewayPort)
}
return fmt.Sprintf("%v:%d", s.value.Address, s.value.Port)
}
func (s *ServiceAddressValue) Value() api.ServiceAddress {
if s == nil || s.value.Port == 0 && s.value.Address == "" {
return api.ServiceAddress{Port: defaultMeshGatewayPort}
}
return s.value
}
func (s *ServiceAddressValue) Set(raw string) error {
var err error
s.value, err = parseAddress(raw)
return err
}
func parseAddress(raw string) (api.ServiceAddress, error) {
result := api.ServiceAddress{}
x, err := template.Parse(raw)
if err != nil {
return result, fmt.Errorf("Error parsing address %q: %v", raw, err)
}
addr, portStr, err := net.SplitHostPort(x)
if err != nil {
return result, fmt.Errorf("Error parsing address %q: %v", x, err)
}
port := defaultMeshGatewayPort
if portStr != "" {
port, err = strconv.Atoi(portStr)
if err != nil {
return result, fmt.Errorf("Error parsing port %q: %v", portStr, err)
}
}
result.Address = addr
result.Port = port
return result, nil
}
var _ flag.Value = (*ServiceAddressValue)(nil)
type ServiceAddressMapValue struct {
value map[string]api.ServiceAddress
}
func (s *ServiceAddressMapValue) String() string {
buf := new(strings.Builder)
for k, v := range s.value {
buf.WriteString(fmt.Sprintf("%v=%v:%d,", k, v.Address, v.Port))
}
return buf.String()
}
func (s *ServiceAddressMapValue) Set(raw string) error {
if s.value == nil {
s.value = make(map[string]api.ServiceAddress)
}
idx := strings.Index(raw, "=")
if idx == -1 {
return fmt.Errorf(`Missing "=" in argument: %s`, raw)
}
key, value := raw[0:idx], raw[idx+1:]
var err error
s.value[key], err = parseAddress(value)
return err
}
var _ flag.Value = (*ServiceAddressMapValue)(nil)

80
command/connect/envoy/flags_test.go Normal file
View file

@ -0,0 +1,80 @@
package envoy
import (
"testing"
"github.com/hashicorp/consul/api"
"github.com/stretchr/testify/require"
)
func TestServiceAddressValue_Value(t *testing.T) {
t.Run("nil receiver", func(t *testing.T) {
var addr *ServiceAddressValue
require.Equal(t, addr.Value(), api.ServiceAddress{Port: defaultMeshGatewayPort})
})
t.Run("default value", func(t *testing.T) {
addr := &ServiceAddressValue{}
require.Equal(t, addr.Value(), api.ServiceAddress{Port: defaultMeshGatewayPort})
})
t.Run("set value", func(t *testing.T) {
addr := &ServiceAddressValue{}
require.NoError(t, addr.Set("localhost:3333"))
require.Equal(t, addr.Value(), api.ServiceAddress{
Address: "localhost",
Port: 3333,
})
})
}
func TestServiceAddressValue_Set(t *testing.T) {
var testcases = []struct {
name string
input string
expectedErr string
expectedValue api.ServiceAddress
}{
{
name: "default port",
input: "8.8.8.8:",
expectedValue: api.ServiceAddress{
Address: "8.8.8.8",
Port: defaultMeshGatewayPort,
},
},
{
name: "valid address",
input: "8.8.8.8:1234",
expectedValue: api.ServiceAddress{Address: "8.8.8.8", Port: 1234},
},
{
name: "invalid address",
input: "not-an-address",
expectedErr: "missing port in address",
},
{
name: "invalid port",
input: "localhost:notaport",
expectedErr: `Error parsing port "notaport"`,
},
{
name: "invalid address format",
input: "too:many:colons",
expectedErr: "address too:many:colons: too many colons",
},
}
for _, tc := range testcases {
t.Run(tc.name, func(t *testing.T) {
addr := &ServiceAddressValue{}
err := addr.Set(tc.input)
if tc.expectedErr != "" {
require.Error(t, err)
require.Contains(t, err.Error(), tc.expectedErr)
return
}
require.Equal(t, addr.Value(), tc.expectedValue)
})
}
}