#7013 add tls config support to consul provider (#7015)

* #7013 add tls config support to consul provider

* #7013 add acceptance tests

* #7013 use GFM tables

* #7013 require one of {CONSUL_ADDRESS,CONSUL_HTTP_ADDR} when running consul acc tests

builtin/providers/consul/config.go

@@ -2,6 +2,7 @@ package consul
 
 import (
 	"log"
+	"net/http"
 
 	consulapi "github.com/hashicorp/consul/api"
 )
@@ -9,8 +10,11 @@ import (
 type Config struct {
 	Datacenter string `mapstructure:"datacenter"`
 	Address    string `mapstructure:"address"`
-	Token      string `mapstructure:"token"`
 	Scheme     string `mapstructure:"scheme"`
+	Token      string `mapstructure:"token"`
+	CAFile     string `mapstructure:"ca_file"`
+	CertFile   string `mapstructure:"cert_file"`
+	KeyFile    string `mapstructure:"key_file"`
 }
 
 // Client() returns a new client for accessing consul.
@@ -26,9 +30,21 @@ func (c *Config) Client() (*consulapi.Client, error) {
 	if c.Scheme != "" {
 		config.Scheme = c.Scheme
 	}
+
+	tlsConfig := &consulapi.TLSConfig{}
+	tlsConfig.CAFile = c.CAFile
+	tlsConfig.CertFile = c.CertFile
+	tlsConfig.KeyFile = c.KeyFile
+	cc, err := consulapi.SetupTLSConfig(tlsConfig)
+	if err != nil {
+		return nil, err
+	}
+	config.HttpClient.Transport.(*http.Transport).TLSClientConfig = cc
+
 	if c.Token != "" {
 		config.Token = c.Token
 	}
+
 	client, err := consulapi.NewClient(config)
 
 	log.Printf("[INFO] Consul Client configured with address: '%s', scheme: '%s', datacenter: '%s'",

builtin/providers/consul/resource_provider.go

@@ -20,11 +20,34 @@ func Provider() terraform.ResourceProvider {
 			"address": &schema.Schema{
 				Type:     schema.TypeString,
 				Optional: true,
+				DefaultFunc: schema.MultiEnvDefaultFunc([]string{
+					"CONSUL_ADDRESS",
+					"CONSUL_HTTP_ADDR",
+				}, nil),
 			},
 
 			"scheme": &schema.Schema{
-				Type:     schema.TypeString,
-				Optional: true,
+				Type:        schema.TypeString,
+				Optional:    true,
+				DefaultFunc: schema.EnvDefaultFunc("CONSUL_SCHEME", nil),
+			},
+
+			"ca_file": &schema.Schema{
+				Type:        schema.TypeString,
+				Optional:    true,
+				DefaultFunc: schema.EnvDefaultFunc("CONSUL_CA_FILE", nil),
+			},
+
+			"cert_file": &schema.Schema{
+				Type:        schema.TypeString,
+				Optional:    true,
+				DefaultFunc: schema.EnvDefaultFunc("CONSUL_CERT_FILE", nil),
+			},
+
+			"key_file": &schema.Schema{
+				Type:        schema.TypeString,
+				Optional:    true,
+				DefaultFunc: schema.EnvDefaultFunc("CONSUL_KEY_FILE", nil),
 			},
 
 			"token": &schema.Schema{

builtin/providers/consul/resource_provider_test.go

@@ -4,7 +4,6 @@ import (
 	"os"
 	"testing"
 
-	consulapi "github.com/hashicorp/consul/api"
 	"github.com/hashicorp/terraform/config"
 	"github.com/hashicorp/terraform/helper/schema"
 	"github.com/hashicorp/terraform/terraform"
@@ -18,12 +17,6 @@ func init() {
 	testAccProviders = map[string]terraform.ResourceProvider{
 		"consul": testAccProvider,
 	}
-
-	// Use the demo address for the acceptance tests
-	testAccProvider.ConfigureFunc = func(d *schema.ResourceData) (interface{}, error) {
-		conf := consulapi.DefaultConfig()
-		return consulapi.NewClient(conf)
-	}
 }
 
 func TestResourceProvider(t *testing.T) {
@@ -56,8 +49,35 @@ func TestResourceProvider_Configure(t *testing.T) {
 	}
 }
 
+func TestResourceProvider_ConfigureTLS(t *testing.T) {
+	rp := Provider()
+
+	raw := map[string]interface{}{
+		"address":    "demo.consul.io:80",
+		"ca_file":    "test-fixtures/cacert.pem",
+		"cert_file":  "test-fixtures/usercert.pem",
+		"datacenter": "nyc3",
+		"key_file":   "test-fixtures/userkey.pem",
+		"scheme":     "https",
+	}
+
+	rawConfig, err := config.NewRawConfig(raw)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	err = rp.Configure(terraform.NewResourceConfig(rawConfig))
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+}
+
 func testAccPreCheck(t *testing.T) {
-	if v := os.Getenv("CONSUL_HTTP_ADDR"); v == "" {
-		t.Fatal("CONSUL_HTTP_ADDR must be set for acceptance tests")
+	if v := os.Getenv("CONSUL_HTTP_ADDR"); v != "" {
+		return
+	}
+	if v := os.Getenv("CONSUL_ADDRESS"); v != "" {
+		return
 	}
+	t.Fatal("Either CONSUL_ADDRESS or CONSUL_HTTP_ADDR must be set for acceptance tests")
 }

builtin/providers/consul/test-fixtures/README.md

@@ -0,0 +1,41 @@
+# Running Consul for Terraform Acceptance Tests
+
+## TLS
+
+Some of the acceptance tests for the `consul` provider use
+TLS. To service these tests, a Consul server must be started
+with HTTPS enabled with TLS certificates.
+
+### Test fixtures
+
+File | Description
+--- | ---
+`agent.json.example` | Configures the Consul agent to respond to HTTPS requests, and verifies the authenticity of HTTPS requests
+`agentcert.pem` | A PEM-encoded certificate used by the Consul agent, valid only for 127.0.0.1 signed by `cacert.pem`, expires 2026
+`agentkey.pem` | A PEM-encoded private key used by the Consul agent
+`cacert.pem` | A PEM-encoded Certificate Authority, expires 2036
+`usercert.pem` | A PEM-encoded certificate used by the Terraform acceptance tests, signed by `cacert.pem`, expires 2026
+`userkey.pem` | A PEM-encoded private key used by the Terraform acceptance tests
+
+### Start
+
+Start a Consul server configured to serve HTTP traffic, and validate incoming
+HTTPS requests.
+
+    ~/.go/src/github.com/hashicorp/terraform> consul agent \
+        -bind 127.0.0.1 \
+        -data-dir=/tmp \
+        -dev \
+        -config-file=builtin/providers/consul/text-fixtures/agent.json.example \
+        -server
+
+### Test
+
+With TLS, `CONSUL_HTTP_ADDR` must match the Common Name of the agent certificate.
+
+    ~/.go/src/github.com/hashicorp/terraform> CONSUL_CERT_FILE=test-fixtures/usercert.pem \
+        CONSUL_KEY_FILE=test-fixtures/userkey.pem \
+        CONSUL_CA_FILE=test-fixtures/cacert.pem \
+        CONSUL_SCHEME=https \
+        CONSUL_HTTP_ADDR=127.0.0.1:8943  \
+        make testacc TEST=./builtin/providers/consul/

builtin/providers/consul/test-fixtures/agent.json.example

@@ -0,0 +1,11 @@
+{
+    "ca_file": "./cacert.pem",
+    "cert_file": "./agentcert.pem",
+    "datacenter": "dc1",
+    "domain": "hashicorp.test",
+    "key_file": "./agentkey.pem",
+    "ports": {
+        "https": 8943
+    },
+    "verify_incoming": true
+}

builtin/providers/consul/test-fixtures/agentcert.pem

@@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE-----
+MIIEjjCCA3agAwIBAgICEAMwDQYJKoZIhvcNAQELBQAwZjELMAkGA1UEBhMCVVMx
+EzARBgNVBAgMCkNhbGlmb3JuaWExEjAQBgNVBAoMCUhhc2hpQ29ycDESMBAGA1UE
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+8p48hpQ61Sfj0oU38Ftzzcs+
+-----END CERTIFICATE-----

builtin/providers/consul/test-fixtures/agentkey.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEowIBAAKCAQEA0Ikds8C3XwnfeSyKynpGZQyqN2BeZzGRc0dzkdTHPIwgGmC8
+/2Ra/IVUgLMoMGfrR86Bz9FNxcXmHpj7YywDxNO+wuofr+qR4ky8TpHdthrcmpYD
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+-----END RSA PRIVATE KEY-----

builtin/providers/consul/test-fixtures/cacert.pem

@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE-----
+MIIDrTCCApWgAwIBAgICEAAwDQYJKoZIhvcNAQELBQAwZjELMAkGA1UEBhMCVVMx
+EzARBgNVBAgMCkNhbGlmb3JuaWExEjAQBgNVBAoMCUhhc2hpQ29ycDESMBAGA1UE
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+-----END CERTIFICATE-----

builtin/providers/consul/test-fixtures/usercert.pem

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
+MIIEJjCCAw6gAwIBAgICEAIwDQYJKoZIhvcNAQELBQAwZjELMAkGA1UEBhMCVVMx
+EzARBgNVBAgMCkNhbGlmb3JuaWExEjAQBgNVBAoMCUhhc2hpQ29ycDESMBAGA1UE
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+-----END CERTIFICATE-----

builtin/providers/consul/test-fixtures/userkey.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpgIBAAKCAQEA2t/OyP6Agzem+4j6F3HZbmyFOHZhd3hDtwHIsPNc9GAjRbUE
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+U4+C5D/Piw/3qy6MjDbA1NJlSE4i2hAgGA79cDvlAoGBAN2o2sSbkOdyyWjLiKPV
+BaxQowrUN2e45YONFQHsGf2sYEwJWNfm2elr/6OoAnhqIlYleGWWsuJSq5jIMRGi
+myAJ1LlL8Rkkkwl9Q07RiPl/SngfsVq0RRnQOimNpIbXtWen8b3DlkFLssSihFHw
+ZB/gu9cRNCFSVIzDXchvQAftAoGBAL0EzeOLgRhSUVhMoWrnaIzFoSkktU/TYF/m
+RQ4dvqY9NDqpVQZaJDedKwpCRSBsytmgBU9tlSJL1ugtTTM5Srhsv+MAb0MhYRSF
+pJqECS9K96ew4o+yx8dcAjJz5Sro2E/opCoJr0COmg+oiVIPbzsNl0SYVMcnaLJj
+ZItGvW1hAoGBALeVUiqLgEDNQAIvprRlpJhU/ANpKm01ja9v66cgvmg62P9fcqb+
+yYPuJ2CwFDlb70KIDys6q9sTKUFykPDiKQgAFvEBQgAyOb3kdl4SXoUPbVDhMqwB
+OfPznsXM6Y5LFNLzEi4n0QP4KsLc+wM52On5vnj7Mgvt5h2QlllPPTXy
+-----END RSA PRIVATE KEY-----

vendor/github.com/hashicorp/consul/api/agent.go

@@ -18,11 +18,12 @@ type AgentCheck struct {
 
 // AgentService represents a service known to the agent
 type AgentService struct {
-	ID      string
-	Service string
-	Tags    []string
-	Port    int
-	Address string
+	ID                string
+	Service           string
+	Tags              []string
+	Port              int
+	Address           string
+	EnableTagOverride bool
 }
 
 // AgentMember represents a cluster member known to the agent
@@ -42,13 +43,14 @@ type AgentMember struct {
 
 // AgentServiceRegistration is used to register a new service
 type AgentServiceRegistration struct {
-	ID      string   `json:",omitempty"`
-	Name    string   `json:",omitempty"`
-	Tags    []string `json:",omitempty"`
-	Port    int      `json:",omitempty"`
-	Address string   `json:",omitempty"`
-	Check   *AgentServiceCheck
-	Checks  AgentServiceChecks
+	ID                string   `json:",omitempty"`
+	Name              string   `json:",omitempty"`
+	Tags              []string `json:",omitempty"`
+	Port              int      `json:",omitempty"`
+	Address           string   `json:",omitempty"`
+	EnableTagOverride bool     `json:",omitempty"`
+	Check             *AgentServiceCheck
+	Checks            AgentServiceChecks
 }
 
 // AgentCheckRegistration is used to register a new check
@@ -196,23 +198,43 @@ func (a *Agent) ServiceDeregister(serviceID string) error {
 	return nil
 }
 
-// PassTTL is used to set a TTL check to the passing state
+// PassTTL is used to set a TTL check to the passing state.
+//
+// DEPRECATION NOTICE: This interface is deprecated in favor of UpdateTTL().
+// The client interface will be removed in 0.8 or changed to use
+// UpdateTTL()'s endpoint and the server endpoints will be removed in 0.9.
 func (a *Agent) PassTTL(checkID, note string) error {
-	return a.UpdateTTL(checkID, note, "pass")
+	return a.updateTTL(checkID, note, "pass")
 }
 
-// WarnTTL is used to set a TTL check to the warning state
+// WarnTTL is used to set a TTL check to the warning state.
+//
+// DEPRECATION NOTICE: This interface is deprecated in favor of UpdateTTL().
+// The client interface will be removed in 0.8 or changed to use
+// UpdateTTL()'s endpoint and the server endpoints will be removed in 0.9.
 func (a *Agent) WarnTTL(checkID, note string) error {
-	return a.UpdateTTL(checkID, note, "warn")
+	return a.updateTTL(checkID, note, "warn")
 }
 
-// FailTTL is used to set a TTL check to the failing state
+// FailTTL is used to set a TTL check to the failing state.
+//
+// DEPRECATION NOTICE: This interface is deprecated in favor of UpdateTTL().
+// The client interface will be removed in 0.8 or changed to use
+// UpdateTTL()'s endpoint and the server endpoints will be removed in 0.9.
 func (a *Agent) FailTTL(checkID, note string) error {
-	return a.UpdateTTL(checkID, note, "fail")
+	return a.updateTTL(checkID, note, "fail")
 }
 
-// UpdateTTL is used to update the TTL of a check
-func (a *Agent) UpdateTTL(checkID, note, status string) error {
+// updateTTL is used to update the TTL of a check. This is the internal
+// method that uses the old API that's present in Consul versions prior to
+// 0.6.4. Since Consul didn't have an analogous "update" API before it seemed
+// ok to break this (former) UpdateTTL in favor of the new UpdateTTL below,
+// but keep the old Pass/Warn/Fail methods using the old API under the hood.
+//
+// DEPRECATION NOTICE: This interface is deprecated in favor of UpdateTTL().
+// The client interface will be removed in 0.8 and the server endpoints will
+// be removed in 0.9.
+func (a *Agent) updateTTL(checkID, note, status string) error {
 	switch status {
 	case "pass":
 	case "warn":
@@ -231,6 +253,51 @@ func (a *Agent) UpdateTTL(checkID, note, status string) error {
 	return nil
 }
 
+// checkUpdate is the payload for a PUT for a check update.
+type checkUpdate struct {
+	// Status is one of the api.Health* states: HealthPassing
+	// ("passing"), HealthWarning ("warning"), or HealthCritical
+	// ("critical").
+	Status string
+
+	// Output is the information to post to the UI for operators as the
+	// output of the process that decided to hit the TTL check. This is
+	// different from the note field that's associated with the check
+	// itself.
+	Output string
+}
+
+// UpdateTTL is used to update the TTL of a check. This uses the newer API
+// that was introduced in Consul 0.6.4 and later. We translate the old status
+// strings for compatibility (though a newer version of Consul will still be
+// required to use this API).
+func (a *Agent) UpdateTTL(checkID, output, status string) error {
+	switch status {
+	case "pass", HealthPassing:
+		status = HealthPassing
+	case "warn", HealthWarning:
+		status = HealthWarning
+	case "fail", HealthCritical:
+		status = HealthCritical
+	default:
+		return fmt.Errorf("Invalid status: %s", status)
+	}
+
+	endpoint := fmt.Sprintf("/v1/agent/check/update/%s", checkID)
+	r := a.c.newRequest("PUT", endpoint)
+	r.obj = &checkUpdate{
+		Status: status,
+		Output: output,
+	}
+
+	_, resp, err := requireOK(a.c.doRequest(r))
+	if err != nil {
+		return err
+	}
+	resp.Body.Close()
+	return nil
+}
+
 // CheckRegister is used to register a new check with
 // the local agent
 func (a *Agent) CheckRegister(check *AgentCheckRegistration) error {

vendor/github.com/hashicorp/consul/api/api.go

@@ -3,9 +3,11 @@ package api
 import (
 	"bytes"
 	"crypto/tls"
+	"crypto/x509"
 	"encoding/json"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"log"
 	"net"
 	"net/http"
@@ -122,12 +124,58 @@ type Config struct {
 	Token string
 }
 
-// DefaultConfig returns a default configuration for the client
+// TLSConfig is used to generate a TLSClientConfig that's useful for talking to
+// Consul using TLS.
+type TLSConfig struct {
+	// Address is the optional address of the Consul server. The port, if any
+	// will be removed from here and this will be set to the ServerName of the
+	// resulting config.
+	Address string
+
+	// CAFile is the optional path to the CA certificate used for Consul
+	// communication, defaults to the system bundle if not specified.
+	CAFile string
+
+	// CertFile is the optional path to the certificate for Consul
+	// communication. If this is set then you need to also set KeyFile.
+	CertFile string
+
+	// KeyFile is the optional path to the private key for Consul communication.
+	// If this is set then you need to also set CertFile.
+	KeyFile string
+
+	// InsecureSkipVerify if set to true will disable TLS host verification.
+	InsecureSkipVerify bool
+}
+
+// DefaultConfig returns a default configuration for the client. By default this
+// will pool and reuse idle connections to Consul. If you have a long-lived
+// client object, this is the desired behavior and should make the most efficient
+// use of the connections to Consul. If you don't reuse a client object , which
+// is not recommended, then you may notice idle connections building up over
+// time. To avoid this, use the DefaultNonPooledConfig() instead.
 func DefaultConfig() *Config {
+	return defaultConfig(cleanhttp.DefaultPooledTransport)
+}
+
+// DefaultNonPooledConfig returns a default configuration for the client which
+// does not pool connections. This isn't a recommended configuration because it
+// will reconnect to Consul on every request, but this is useful to avoid the
+// accumulation of idle connections if you make many client objects during the
+// lifetime of your application.
+func DefaultNonPooledConfig() *Config {
+	return defaultConfig(cleanhttp.DefaultTransport)
+}
+
+// defaultConfig returns the default configuration for the client, using the
+// given function to make the transport.
+func defaultConfig(transportFn func() *http.Transport) *Config {
 	config := &Config{
-		Address:    "127.0.0.1:8500",
-		Scheme:     "http",
-		HttpClient: cleanhttp.DefaultClient(),
+		Address: "127.0.0.1:8500",
+		Scheme:  "http",
+		HttpClient: &http.Client{
+			Transport: transportFn(),
+		},
 	}
 
 	if addr := os.Getenv("CONSUL_HTTP_ADDR"); addr != "" {
@@ -172,10 +220,19 @@ func DefaultConfig() *Config {
 		}
 
 		if !doVerify {
-			transport := cleanhttp.DefaultTransport()
-			transport.TLSClientConfig = &tls.Config{
+			tlsClientConfig, err := SetupTLSConfig(&TLSConfig{
 				InsecureSkipVerify: true,
+			})
+
+			// We don't expect this to fail given that we aren't
+			// parsing any of the input, but we panic just in case
+			// since this doesn't have an error return.
+			if err != nil {
+				panic(err)
 			}
+
+			transport := transportFn()
+			transport.TLSClientConfig = tlsClientConfig
 			config.HttpClient.Transport = transport
 		}
 	}
@@ -183,6 +240,50 @@ func DefaultConfig() *Config {
 	return config
 }
 
+// TLSConfig is used to generate a TLSClientConfig that's useful for talking to
+// Consul using TLS.
+func SetupTLSConfig(tlsConfig *TLSConfig) (*tls.Config, error) {
+	tlsClientConfig := &tls.Config{
+		InsecureSkipVerify: tlsConfig.InsecureSkipVerify,
+	}
+
+	if tlsConfig.Address != "" {
+		server := tlsConfig.Address
+		hasPort := strings.LastIndex(server, ":") > strings.LastIndex(server, "]")
+		if hasPort {
+			var err error
+			server, _, err = net.SplitHostPort(server)
+			if err != nil {
+				return nil, err
+			}
+		}
+		tlsClientConfig.ServerName = server
+	}
+
+	if tlsConfig.CertFile != "" && tlsConfig.KeyFile != "" {
+		tlsCert, err := tls.LoadX509KeyPair(tlsConfig.CertFile, tlsConfig.KeyFile)
+		if err != nil {
+			return nil, err
+		}
+		tlsClientConfig.Certificates = []tls.Certificate{tlsCert}
+	}
+
+	if tlsConfig.CAFile != "" {
+		data, err := ioutil.ReadFile(tlsConfig.CAFile)
+		if err != nil {
+			return nil, fmt.Errorf("failed to read CA file: %v", err)
+		}
+
+		caPool := x509.NewCertPool()
+		if !caPool.AppendCertsFromPEM(data) {
+			return nil, fmt.Errorf("failed to parse CA certificate")
+		}
+		tlsClientConfig.RootCAs = caPool
+	}
+
+	return tlsClientConfig, nil
+}
+
 // Client provides a client to the Consul API
 type Client struct {
 	config Config

vendor/github.com/hashicorp/consul/api/catalog.go

@@ -6,13 +6,14 @@ type Node struct {
 }
 
 type CatalogService struct {
-	Node           string
-	Address        string
-	ServiceID      string
-	ServiceName    string
-	ServiceAddress string
-	ServiceTags    []string
-	ServicePort    int
+	Node                     string
+	Address                  string
+	ServiceID                string
+	ServiceName              string
+	ServiceAddress           string
+	ServiceTags              []string
+	ServicePort              int
+	ServiceEnableTagOverride bool
 }
 
 type CatalogNode struct {

vendor/github.com/hashicorp/consul/api/health.go

@@ -4,6 +4,16 @@ import (
 	"fmt"
 )
 
+const (
+	// HealthAny is special, and is used as a wild card,
+	// not as a specific state.
+	HealthAny      = "any"
+	HealthUnknown  = "unknown"
+	HealthPassing  = "passing"
+	HealthWarning  = "warning"
+	HealthCritical = "critical"
+)
+
 // HealthCheck is used to represent a single check
 type HealthCheck struct {
 	Node        string
@@ -85,7 +95,7 @@ func (h *Health) Service(service, tag string, passingOnly bool, q *QueryOptions)
 		r.params.Set("tag", tag)
 	}
 	if passingOnly {
-		r.params.Set("passing", "1")
+		r.params.Set(HealthPassing, "1")
 	}
 	rtt, resp, err := requireOK(h.c.doRequest(r))
 	if err != nil {
@@ -108,11 +118,11 @@ func (h *Health) Service(service, tag string, passingOnly bool, q *QueryOptions)
 // The wildcard "any" state can also be used for all checks.
 func (h *Health) State(state string, q *QueryOptions) ([]*HealthCheck, *QueryMeta, error) {
 	switch state {
-	case "any":
-	case "warning":
-	case "critical":
-	case "passing":
-	case "unknown":
+	case HealthAny:
+	case HealthWarning:
+	case HealthCritical:
+	case HealthPassing:
+	case HealthUnknown:
 	default:
 		return nil, nil, fmt.Errorf("Unsupported state: %v", state)
 	}

vendor/github.com/hashicorp/consul/api/kv.go

@@ -23,6 +23,43 @@ type KVPair struct {
 // KVPairs is a list of KVPair objects
 type KVPairs []*KVPair
 
+// KVOp constants give possible operations available in a KVTxn.
+type KVOp string
+
+const (
+	KVSet          KVOp = "set"
+	KVDelete            = "delete"
+	KVDeleteCAS         = "delete-cas"
+	KVDeleteTree        = "delete-tree"
+	KVCAS               = "cas"
+	KVLock              = "lock"
+	KVUnlock            = "unlock"
+	KVGet               = "get"
+	KVGetTree           = "get-tree"
+	KVCheckSession      = "check-session"
+	KVCheckIndex        = "check-index"
+)
+
+// KVTxnOp defines a single operation inside a transaction.
+type KVTxnOp struct {
+	Verb    string
+	Key     string
+	Value   []byte
+	Flags   uint64
+	Index   uint64
+	Session string
+}
+
+// KVTxnOps defines a set of operations to be performed inside a single
+// transaction.
+type KVTxnOps []*KVTxnOp
+
+// KVTxnResponse has the outcome of a transaction.
+type KVTxnResponse struct {
+	Results []*KVPair
+	Errors  TxnErrors
+}
+
 // KV is used to manipulate the K/V API
 type KV struct {
 	c *Client
@@ -238,3 +275,122 @@ func (k *KV) deleteInternal(key string, params map[string]string, q *WriteOption
 	res := strings.Contains(string(buf.Bytes()), "true")
 	return res, qm, nil
 }
+
+// TxnOp is the internal format we send to Consul. It's not specific to KV,
+// though currently only KV operations are supported.
+type TxnOp struct {
+	KV *KVTxnOp
+}
+
+// TxnOps is a list of transaction operations.
+type TxnOps []*TxnOp
+
+// TxnResult is the internal format we receive from Consul.
+type TxnResult struct {
+	KV *KVPair
+}
+
+// TxnResults is a list of TxnResult objects.
+type TxnResults []*TxnResult
+
+// TxnError is used to return information about an operation in a transaction.
+type TxnError struct {
+	OpIndex int
+	What    string
+}
+
+// TxnErrors is a list of TxnError objects.
+type TxnErrors []*TxnError
+
+// TxnResponse is the internal format we receive from Consul.
+type TxnResponse struct {
+	Results TxnResults
+	Errors  TxnErrors
+}
+
+// Txn is used to apply multiple KV operations in a single, atomic transaction.
+//
+// Note that Go will perform the required base64 encoding on the values
+// automatically because the type is a byte slice. Transactions are defined as a
+// list of operations to perform, using the KVOp constants and KVTxnOp structure
+// to define operations. If any operation fails, none of the changes are applied
+// to the state store. Note that this hides the internal raw transaction interface
+// and munges the input and output types into KV-specific ones for ease of use.
+// If there are more non-KV operations in the future we may break out a new
+// transaction API client, but it will be easy to keep this KV-specific variant
+// supported.
+//
+// Even though this is generally a write operation, we take a QueryOptions input
+// and return a QueryMeta output. If the transaction contains only read ops, then
+// Consul will fast-path it to a different endpoint internally which supports
+// consistency controls, but not blocking. If there are write operations then
+// the request will always be routed through raft and any consistency settings
+// will be ignored.
+//
+// Here's an example:
+//
+// ops := KVTxnOps{
+//     &KVTxnOp{
+//         Verb:    KVLock,
+//         Key:     "test/lock",
+//         Session: "adf4238a-882b-9ddc-4a9d-5b6758e4159e",
+//         Value:   []byte("hello"),
+//     },
+//     &KVTxnOp{
+//         Verb:    KVGet,
+//         Key:     "another/key",
+//     },
+// }
+// ok, response, _, err := kv.Txn(&ops, nil)
+//
+// If there is a problem making the transaction request then an error will be
+// returned. Otherwise, the ok value will be true if the transaction succeeded
+// or false if it was rolled back. The response is a structured return value which
+// will have the outcome of the transaction. Its Results member will have entries
+// for each operation. Deleted keys will have a nil entry in the, and to save
+// space, the Value of each key in the Results will be nil unless the operation
+// is a KVGet. If the transaction was rolled back, the Errors member will have
+// entries referencing the index of the operation that failed along with an error
+// message.
+func (k *KV) Txn(txn KVTxnOps, q *QueryOptions) (bool, *KVTxnResponse, *QueryMeta, error) {
+	r := k.c.newRequest("PUT", "/v1/txn")
+	r.setQueryOptions(q)
+
+	// Convert into the internal format since this is an all-KV txn.
+	ops := make(TxnOps, 0, len(txn))
+	for _, kvOp := range txn {
+		ops = append(ops, &TxnOp{KV: kvOp})
+	}
+	r.obj = ops
+	rtt, resp, err := k.c.doRequest(r)
+	if err != nil {
+		return false, nil, nil, err
+	}
+	defer resp.Body.Close()
+
+	qm := &QueryMeta{}
+	parseQueryMeta(resp, qm)
+	qm.RequestTime = rtt
+
+	if resp.StatusCode == http.StatusOK || resp.StatusCode == http.StatusConflict {
+		var txnResp TxnResponse
+		if err := decodeBody(resp, &txnResp); err != nil {
+			return false, nil, nil, err
+		}
+
+		// Convert from the internal format.
+		kvResp := KVTxnResponse{
+			Errors: txnResp.Errors,
+		}
+		for _, result := range txnResp.Results {
+			kvResp.Results = append(kvResp.Results, result.KV)
+		}
+		return resp.StatusCode == http.StatusOK, &kvResp, qm, nil
+	}
+
+	var buf bytes.Buffer
+	if _, err := io.Copy(&buf, resp.Body); err != nil {
+		return false, nil, nil, fmt.Errorf("Failed to read response: %v", err)
+	}
+	return false, nil, nil, fmt.Errorf("Failed request: %s", buf.String())
+}

vendor/vendor.json

@@ -890,9 +890,11 @@
 			"revisionTime": "2016-07-26T16:33:11Z"
 		},
 		{
+			"checksumSHA1": "glOabn8rkJvz7tjz/xfX4lmt070=",
 			"comment": "v0.6.3-28-g3215b87",
 			"path": "github.com/hashicorp/consul/api",
-			"revision": "3215b8727f44c778dd7045dcfd5ac42735c581a9"
+			"revision": "d4a8a43d2b600e662a50a75be70daed5fad8dd2d",
+			"revisionTime": "2016-06-04T06:35:46Z"
 		},
 		{
 			"path": "github.com/hashicorp/errwrap",

website/source/docs/providers/consul/index.html.markdown

@@ -46,4 +46,8 @@ The following arguments are supported:
 * `address` - (Optional) The HTTP(S) API address of the agent to use. Defaults to "127.0.0.1:8500".
 * `scheme` - (Optional) The URL scheme of the agent to use ("http" or "https"). Defaults to "http".
 * `datacenter` - (Optional) The datacenter to use. Defaults to that of the agent.
+* `token` - (Optional) The ACL token to use by default when making requests to the agent.
+* `ca_file` - (Optional) A path to a PEM-encoded certificate authority used to verify the remote agent's certificate.
+* `cert_file` - (Optional) A path to a PEM-encoded certificate provided to the remote agent; requires use of `key_file`.
+* `key_file`- (Optional) A path to a PEM-encoded private key, required if `cert_file` is specified.