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client_set.go
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client_set.go
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package dependency
import (
"crypto/tls"
"fmt"
"log"
"net"
"net/http"
"sync"
"time"
consulapi "github.com/hashicorp/consul/api"
rootcerts "github.com/hashicorp/go-rootcerts"
vaultapi "github.com/hashicorp/vault/api"
)
// ClientSet is a collection of clients that dependencies use to communicate
// with remote services like Consul or Vault.
type ClientSet struct {
sync.RWMutex
vault *vaultClient
consul *consulClient
}
// consulClient is a wrapper around a real Consul API client.
type consulClient struct {
client *consulapi.Client
transport *http.Transport
}
// vaultClient is a wrapper around a real Vault API client.
type vaultClient struct {
client *vaultapi.Client
httpClient *http.Client
}
// CreateConsulClientInput is used as input to the CreateConsulClient function.
type CreateConsulClientInput struct {
Address string
Token string
AuthEnabled bool
AuthUsername string
AuthPassword string
SSLEnabled bool
SSLVerify bool
SSLCert string
SSLKey string
SSLCACert string
SSLCAPath string
ServerName string
TransportDialKeepAlive time.Duration
TransportDialTimeout time.Duration
TransportDisableKeepAlives bool
TransportIdleConnTimeout time.Duration
TransportMaxIdleConns int
TransportMaxIdleConnsPerHost int
TransportTLSHandshakeTimeout time.Duration
}
// CreateVaultClientInput is used as input to the CreateVaultClient function.
type CreateVaultClientInput struct {
Address string
Namespace string
Token string
UnwrapToken bool
SSLEnabled bool
SSLVerify bool
SSLCert string
SSLKey string
SSLCACert string
SSLCAPath string
ServerName string
TransportDialKeepAlive time.Duration
TransportDialTimeout time.Duration
TransportDisableKeepAlives bool
TransportIdleConnTimeout time.Duration
TransportMaxIdleConns int
TransportMaxIdleConnsPerHost int
TransportTLSHandshakeTimeout time.Duration
}
// NewClientSet creates a new client set that is ready to accept clients.
func NewClientSet() *ClientSet {
return &ClientSet{}
}
// CreateConsulClient creates a new Consul API client from the given input.
func (c *ClientSet) CreateConsulClient(i *CreateConsulClientInput) error {
consulConfig := consulapi.DefaultConfig()
if i.Address != "" {
consulConfig.Address = i.Address
}
if i.Token != "" {
consulConfig.Token = i.Token
}
if i.AuthEnabled {
consulConfig.HttpAuth = &consulapi.HttpBasicAuth{
Username: i.AuthUsername,
Password: i.AuthPassword,
}
}
// This transport will attempt to keep connections open to the Consul server.
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
Timeout: i.TransportDialTimeout,
KeepAlive: i.TransportDialKeepAlive,
}).Dial,
DisableKeepAlives: i.TransportDisableKeepAlives,
MaxIdleConns: i.TransportMaxIdleConns,
IdleConnTimeout: i.TransportIdleConnTimeout,
MaxIdleConnsPerHost: i.TransportMaxIdleConnsPerHost,
TLSHandshakeTimeout: i.TransportTLSHandshakeTimeout,
}
// Configure SSL
if i.SSLEnabled {
consulConfig.Scheme = "https"
var tlsConfig tls.Config
// Custom certificate or certificate and key
if i.SSLCert != "" && i.SSLKey != "" {
cert, err := tls.LoadX509KeyPair(i.SSLCert, i.SSLKey)
if err != nil {
return fmt.Errorf("client set: consul: %s", err)
}
tlsConfig.Certificates = []tls.Certificate{cert}
} else if i.SSLCert != "" {
cert, err := tls.LoadX509KeyPair(i.SSLCert, i.SSLCert)
if err != nil {
return fmt.Errorf("client set: consul: %s", err)
}
tlsConfig.Certificates = []tls.Certificate{cert}
}
// Custom CA certificate
if i.SSLCACert != "" || i.SSLCAPath != "" {
rootConfig := &rootcerts.Config{
CAFile: i.SSLCACert,
CAPath: i.SSLCAPath,
}
if err := rootcerts.ConfigureTLS(&tlsConfig, rootConfig); err != nil {
return fmt.Errorf("client set: consul configuring TLS failed: %s", err)
}
}
// Construct all the certificates now
tlsConfig.BuildNameToCertificate()
// SSL verification
if i.ServerName != "" {
tlsConfig.ServerName = i.ServerName
tlsConfig.InsecureSkipVerify = false
}
if !i.SSLVerify {
log.Printf("[WARN] (clients) disabling consul SSL verification")
tlsConfig.InsecureSkipVerify = true
}
// Save the TLS config on our transport
transport.TLSClientConfig = &tlsConfig
}
// Setup the new transport
consulConfig.Transport = transport
// Create the API client
client, err := consulapi.NewClient(consulConfig)
if err != nil {
return fmt.Errorf("client set: consul: %s", err)
}
// Save the data on ourselves
c.Lock()
c.consul = &consulClient{
client: client,
transport: transport,
}
c.Unlock()
return nil
}
func (c *ClientSet) CreateVaultClient(i *CreateVaultClientInput) error {
vaultConfig := vaultapi.DefaultConfig()
if i.Address != "" {
vaultConfig.Address = i.Address
}
// This transport will attempt to keep connections open to the Vault server.
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
Timeout: i.TransportDialTimeout,
KeepAlive: i.TransportDialKeepAlive,
}).Dial,
DisableKeepAlives: i.TransportDisableKeepAlives,
MaxIdleConns: i.TransportMaxIdleConns,
IdleConnTimeout: i.TransportIdleConnTimeout,
MaxIdleConnsPerHost: i.TransportMaxIdleConnsPerHost,
TLSHandshakeTimeout: i.TransportTLSHandshakeTimeout,
}
// Configure SSL
if i.SSLEnabled {
var tlsConfig tls.Config
// Custom certificate or certificate and key
if i.SSLCert != "" && i.SSLKey != "" {
cert, err := tls.LoadX509KeyPair(i.SSLCert, i.SSLKey)
if err != nil {
return fmt.Errorf("client set: vault: %s", err)
}
tlsConfig.Certificates = []tls.Certificate{cert}
} else if i.SSLCert != "" {
cert, err := tls.LoadX509KeyPair(i.SSLCert, i.SSLCert)
if err != nil {
return fmt.Errorf("client set: vault: %s", err)
}
tlsConfig.Certificates = []tls.Certificate{cert}
}
// Custom CA certificate
if i.SSLCACert != "" || i.SSLCAPath != "" {
rootConfig := &rootcerts.Config{
CAFile: i.SSLCACert,
CAPath: i.SSLCAPath,
}
if err := rootcerts.ConfigureTLS(&tlsConfig, rootConfig); err != nil {
return fmt.Errorf("client set: vault configuring TLS failed: %s", err)
}
}
// Construct all the certificates now
tlsConfig.BuildNameToCertificate()
// SSL verification
if i.ServerName != "" {
tlsConfig.ServerName = i.ServerName
tlsConfig.InsecureSkipVerify = false
}
if !i.SSLVerify {
log.Printf("[WARN] (clients) disabling vault SSL verification")
tlsConfig.InsecureSkipVerify = true
}
// Save the TLS config on our transport
transport.TLSClientConfig = &tlsConfig
}
// Setup the new transport
vaultConfig.HttpClient.Transport = transport
// Create the client
client, err := vaultapi.NewClient(vaultConfig)
if err != nil {
return fmt.Errorf("client set: vault: %s", err)
}
// Set the namespace if given.
if i.Namespace != "" {
client.SetNamespace(i.Namespace)
}
// Set the token if given
if i.Token != "" {
client.SetToken(i.Token)
}
// Check if we are unwrapping
if i.UnwrapToken {
secret, err := client.Logical().Unwrap(i.Token)
if err != nil {
return fmt.Errorf("client set: vault unwrap: %s", err)
}
if secret == nil {
return fmt.Errorf("client set: vault unwrap: no secret")
}
if secret.Auth == nil {
return fmt.Errorf("client set: vault unwrap: no secret auth")
}
if secret.Auth.ClientToken == "" {
return fmt.Errorf("client set: vault unwrap: no token returned")
}
client.SetToken(secret.Auth.ClientToken)
}
// Save the data on ourselves
c.Lock()
c.vault = &vaultClient{
client: client,
httpClient: vaultConfig.HttpClient,
}
c.Unlock()
return nil
}
// Consul returns the Consul client for this set.
func (c *ClientSet) Consul() *consulapi.Client {
c.RLock()
defer c.RUnlock()
return c.consul.client
}
// Vault returns the Vault client for this set.
func (c *ClientSet) Vault() *vaultapi.Client {
c.RLock()
defer c.RUnlock()
return c.vault.client
}
// Stop closes all idle connections for any attached clients.
func (c *ClientSet) Stop() {
c.Lock()
defer c.Unlock()
if c.consul != nil {
c.consul.transport.CloseIdleConnections()
}
if c.vault != nil {
c.vault.httpClient.Transport.(*http.Transport).CloseIdleConnections()
}
}