File: agent.go

package info (click to toggle)
consul 1.5.2+dfsg1-12
  • links: PTS, VCS
  • area: main
  • in suites: sid
  • size: 41,656 kB
  • sloc: sh: 2,887; makefile: 127; ruby: 75; cpp: 58; xml: 36
file content (1035 lines) | stat: -rw-r--r-- 32,594 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
package api

import (
	"bufio"
	"bytes"
	"fmt"
	"io"
	"net/http"
	"net/url"
)

// ServiceKind is the kind of service being registered.
type ServiceKind string

const (
	// ServiceKindTypical is a typical, classic Consul service. This is
	// represented by the absence of a value. This was chosen for ease of
	// backwards compatibility: existing services in the catalog would
	// default to the typical service.
	ServiceKindTypical ServiceKind = ""

	// ServiceKindConnectProxy is a proxy for the Connect feature. This
	// service proxies another service within Consul and speaks the connect
	// protocol.
	ServiceKindConnectProxy ServiceKind = "connect-proxy"
)

// ProxyExecMode is the execution mode for a managed Connect proxy.
type ProxyExecMode string

const (
	// ProxyExecModeDaemon indicates that the proxy command should be long-running
	// and should be started and supervised by the agent until it's target service
	// is deregistered.
	ProxyExecModeDaemon ProxyExecMode = "daemon"

	// ProxyExecModeScript indicates that the proxy command should be invoke to
	// completion on each change to the configuration of lifecycle event. The
	// script typically fetches the config and certificates from the agent API and
	// then configures an externally managed daemon, perhaps starting and stopping
	// it if necessary.
	ProxyExecModeScript ProxyExecMode = "script"
)

// UpstreamDestType is the type of upstream discovery mechanism.
type UpstreamDestType string

const (
	// UpstreamDestTypeService discovers instances via healthy service lookup.
	UpstreamDestTypeService UpstreamDestType = "service"

	// UpstreamDestTypePreparedQuery discovers instances via prepared query
	// execution.
	UpstreamDestTypePreparedQuery UpstreamDestType = "prepared_query"
)

// AgentCheck represents a check known to the agent
type AgentCheck struct {
	Node        string
	CheckID     string
	Name        string
	Status      string
	Notes       string
	Output      string
	ServiceID   string
	ServiceName string
	Definition  HealthCheckDefinition
}

// AgentWeights represent optional weights for a service
type AgentWeights struct {
	Passing int
	Warning int
}

// AgentService represents a service known to the agent
type AgentService struct {
	Kind              ServiceKind `json:",omitempty"`
	ID                string
	Service           string
	Tags              []string
	Meta              map[string]string
	Port              int
	Address           string
	Weights           AgentWeights
	EnableTagOverride bool
	CreateIndex       uint64 `json:",omitempty" bexpr:"-"`
	ModifyIndex       uint64 `json:",omitempty" bexpr:"-"`
	ContentHash       string `json:",omitempty" bexpr:"-"`
	// DEPRECATED (ProxyDestination) - remove this field
	ProxyDestination string                          `json:",omitempty" bexpr:"-"`
	Proxy            *AgentServiceConnectProxyConfig `json:",omitempty"`
	Connect          *AgentServiceConnect            `json:",omitempty"`
}

// AgentServiceChecksInfo returns information about a Service and its checks
type AgentServiceChecksInfo struct {
	AggregatedStatus string
	Service          *AgentService
	Checks           HealthChecks
}

// AgentServiceConnect represents the Connect configuration of a service.
type AgentServiceConnect struct {
	Native         bool                      `json:",omitempty"`
	Proxy          *AgentServiceConnectProxy `json:",omitempty" bexpr:"-"`
	SidecarService *AgentServiceRegistration `json:",omitempty" bexpr:"-"`
}

// AgentServiceConnectProxy represents the Connect Proxy configuration of a
// service.
type AgentServiceConnectProxy struct {
	ExecMode  ProxyExecMode          `json:",omitempty"`
	Command   []string               `json:",omitempty"`
	Config    map[string]interface{} `json:",omitempty" bexpr:"-"`
	Upstreams []Upstream             `json:",omitempty"`
}

// AgentServiceConnectProxyConfig is the proxy configuration in a connect-proxy
// ServiceDefinition or response.
type AgentServiceConnectProxyConfig struct {
	DestinationServiceName string
	DestinationServiceID   string                 `json:",omitempty"`
	LocalServiceAddress    string                 `json:",omitempty"`
	LocalServicePort       int                    `json:",omitempty"`
	Config                 map[string]interface{} `json:",omitempty" bexpr:"-"`
	Upstreams              []Upstream
}

// AgentMember represents a cluster member known to the agent
type AgentMember struct {
	Name        string
	Addr        string
	Port        uint16
	Tags        map[string]string
	Status      int
	ProtocolMin uint8
	ProtocolMax uint8
	ProtocolCur uint8
	DelegateMin uint8
	DelegateMax uint8
	DelegateCur uint8
}

// AllSegments is used to select for all segments in MembersOpts.
const AllSegments = "_all"

// MembersOpts is used for querying member information.
type MembersOpts struct {
	// WAN is whether to show members from the WAN.
	WAN bool

	// Segment is the LAN segment to show members for. Setting this to the
	// AllSegments value above will show members in all segments.
	Segment string
}

// AgentServiceRegistration is used to register a new service
type AgentServiceRegistration struct {
	Kind              ServiceKind       `json:",omitempty"`
	ID                string            `json:",omitempty"`
	Name              string            `json:",omitempty"`
	Tags              []string          `json:",omitempty"`
	Port              int               `json:",omitempty"`
	Address           string            `json:",omitempty"`
	EnableTagOverride bool              `json:",omitempty"`
	Meta              map[string]string `json:",omitempty"`
	Weights           *AgentWeights     `json:",omitempty"`
	Check             *AgentServiceCheck
	Checks            AgentServiceChecks
	// DEPRECATED (ProxyDestination) - remove this field
	ProxyDestination string                          `json:",omitempty"`
	Proxy            *AgentServiceConnectProxyConfig `json:",omitempty"`
	Connect          *AgentServiceConnect            `json:",omitempty"`
}

// AgentCheckRegistration is used to register a new check
type AgentCheckRegistration struct {
	ID        string `json:",omitempty"`
	Name      string `json:",omitempty"`
	Notes     string `json:",omitempty"`
	ServiceID string `json:",omitempty"`
	AgentServiceCheck
}

// AgentServiceCheck is used to define a node or service level check
type AgentServiceCheck struct {
	CheckID           string              `json:",omitempty"`
	Name              string              `json:",omitempty"`
	Args              []string            `json:"ScriptArgs,omitempty"`
	DockerContainerID string              `json:",omitempty"`
	Shell             string              `json:",omitempty"` // Only supported for Docker.
	Interval          string              `json:",omitempty"`
	Timeout           string              `json:",omitempty"`
	TTL               string              `json:",omitempty"`
	HTTP              string              `json:",omitempty"`
	Header            map[string][]string `json:",omitempty"`
	Method            string              `json:",omitempty"`
	TCP               string              `json:",omitempty"`
	Status            string              `json:",omitempty"`
	Notes             string              `json:",omitempty"`
	TLSSkipVerify     bool                `json:",omitempty"`
	GRPC              string              `json:",omitempty"`
	GRPCUseTLS        bool                `json:",omitempty"`
	AliasNode         string              `json:",omitempty"`
	AliasService      string              `json:",omitempty"`

	// In Consul 0.7 and later, checks that are associated with a service
	// may also contain this optional DeregisterCriticalServiceAfter field,
	// which is a timeout in the same Go time format as Interval and TTL. If
	// a check is in the critical state for more than this configured value,
	// then its associated service (and all of its associated checks) will
	// automatically be deregistered.
	DeregisterCriticalServiceAfter string `json:",omitempty"`
}
type AgentServiceChecks []*AgentServiceCheck

// AgentToken is used when updating ACL tokens for an agent.
type AgentToken struct {
	Token string
}

// Metrics info is used to store different types of metric values from the agent.
type MetricsInfo struct {
	Timestamp string
	Gauges    []GaugeValue
	Points    []PointValue
	Counters  []SampledValue
	Samples   []SampledValue
}

// GaugeValue stores one value that is updated as time goes on, such as
// the amount of memory allocated.
type GaugeValue struct {
	Name   string
	Value  float32
	Labels map[string]string
}

// PointValue holds a series of points for a metric.
type PointValue struct {
	Name   string
	Points []float32
}

// SampledValue stores info about a metric that is incremented over time,
// such as the number of requests to an HTTP endpoint.
type SampledValue struct {
	Name   string
	Count  int
	Sum    float64
	Min    float64
	Max    float64
	Mean   float64
	Stddev float64
	Labels map[string]string
}

// AgentAuthorizeParams are the request parameters for authorizing a request.
type AgentAuthorizeParams struct {
	Target           string
	ClientCertURI    string
	ClientCertSerial string
}

// AgentAuthorize is the response structure for Connect authorization.
type AgentAuthorize struct {
	Authorized bool
	Reason     string
}

// ConnectProxyConfig is the response structure for agent-local proxy
// configuration.
type ConnectProxyConfig struct {
	ProxyServiceID    string
	TargetServiceID   string
	TargetServiceName string
	ContentHash       string
	// DEPRECATED(managed-proxies) - this struct is re-used for sidecar configs
	// but they don't need ExecMode or Command
	ExecMode  ProxyExecMode          `json:",omitempty"`
	Command   []string               `json:",omitempty"`
	Config    map[string]interface{} `bexpr:"-"`
	Upstreams []Upstream
}

// Upstream is the response structure for a proxy upstream configuration.
type Upstream struct {
	DestinationType      UpstreamDestType `json:",omitempty"`
	DestinationNamespace string           `json:",omitempty"`
	DestinationName      string
	Datacenter           string                 `json:",omitempty"`
	LocalBindAddress     string                 `json:",omitempty"`
	LocalBindPort        int                    `json:",omitempty"`
	Config               map[string]interface{} `json:",omitempty" bexpr:"-"`
}

// Agent can be used to query the Agent endpoints
type Agent struct {
	c *Client

	// cache the node name
	nodeName string
}

// Agent returns a handle to the agent endpoints
func (c *Client) Agent() *Agent {
	return &Agent{c: c}
}

// Self is used to query the agent we are speaking to for
// information about itself
func (a *Agent) Self() (map[string]map[string]interface{}, error) {
	r := a.c.newRequest("GET", "/v1/agent/self")
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	var out map[string]map[string]interface{}
	if err := decodeBody(resp, &out); err != nil {
		return nil, err
	}
	return out, nil
}

// Host is used to retrieve information about the host the
// agent is running on such as CPU, memory, and disk. Requires
// a operator:read ACL token.
func (a *Agent) Host() (map[string]interface{}, error) {
	r := a.c.newRequest("GET", "/v1/agent/host")
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	var out map[string]interface{}
	if err := decodeBody(resp, &out); err != nil {
		return nil, err
	}
	return out, nil
}

// Metrics is used to query the agent we are speaking to for
// its current internal metric data
func (a *Agent) Metrics() (*MetricsInfo, error) {
	r := a.c.newRequest("GET", "/v1/agent/metrics")
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	var out *MetricsInfo
	if err := decodeBody(resp, &out); err != nil {
		return nil, err
	}
	return out, nil
}

// Reload triggers a configuration reload for the agent we are connected to.
func (a *Agent) Reload() error {
	r := a.c.newRequest("PUT", "/v1/agent/reload")
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	return nil
}

// NodeName is used to get the node name of the agent
func (a *Agent) NodeName() (string, error) {
	if a.nodeName != "" {
		return a.nodeName, nil
	}
	info, err := a.Self()
	if err != nil {
		return "", err
	}
	name := info["Config"]["NodeName"].(string)
	a.nodeName = name
	return name, nil
}

// Checks returns the locally registered checks
func (a *Agent) Checks() (map[string]*AgentCheck, error) {
	return a.ChecksWithFilter("")
}

// ChecksWithFilter returns a subset of the locally registered checks that match
// the given filter expression
func (a *Agent) ChecksWithFilter(filter string) (map[string]*AgentCheck, error) {
	r := a.c.newRequest("GET", "/v1/agent/checks")
	r.filterQuery(filter)
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	var out map[string]*AgentCheck
	if err := decodeBody(resp, &out); err != nil {
		return nil, err
	}
	return out, nil
}

// Services returns the locally registered services
func (a *Agent) Services() (map[string]*AgentService, error) {
	return a.ServicesWithFilter("")
}

// ServicesWithFilter returns a subset of the locally registered services that match
// the given filter expression
func (a *Agent) ServicesWithFilter(filter string) (map[string]*AgentService, error) {
	r := a.c.newRequest("GET", "/v1/agent/services")
	r.filterQuery(filter)
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	var out map[string]*AgentService
	if err := decodeBody(resp, &out); err != nil {
		return nil, err
	}

	return out, nil
}

// AgentHealthServiceByID returns for a given serviceID: the aggregated health status, the service definition or an error if any
// - If the service is not found, will return status (critical, nil, nil)
// - If the service is found, will return (critical|passing|warning), AgentServiceChecksInfo, nil)
// - In all other cases, will return an error
func (a *Agent) AgentHealthServiceByID(serviceID string) (string, *AgentServiceChecksInfo, error) {
	path := fmt.Sprintf("/v1/agent/health/service/id/%v", url.PathEscape(serviceID))
	r := a.c.newRequest("GET", path)
	r.params.Add("format", "json")
	r.header.Set("Accept", "application/json")
	_, resp, err := a.c.doRequest(r)
	if err != nil {
		return "", nil, err
	}
	defer resp.Body.Close()
	// Service not Found
	if resp.StatusCode == http.StatusNotFound {
		return HealthCritical, nil, nil
	}
	var out *AgentServiceChecksInfo
	if err := decodeBody(resp, &out); err != nil {
		return HealthCritical, out, err
	}
	switch resp.StatusCode {
	case http.StatusOK:
		return HealthPassing, out, nil
	case http.StatusTooManyRequests:
		return HealthWarning, out, nil
	case http.StatusServiceUnavailable:
		return HealthCritical, out, nil
	}
	return HealthCritical, out, fmt.Errorf("Unexpected Error Code %v for %s", resp.StatusCode, path)
}

// AgentHealthServiceByName returns for a given service name: the aggregated health status for all services
// having the specified name.
// - If no service is not found, will return status (critical, [], nil)
// - If the service is found, will return (critical|passing|warning), []api.AgentServiceChecksInfo, nil)
// - In all other cases, will return an error
func (a *Agent) AgentHealthServiceByName(service string) (string, []AgentServiceChecksInfo, error) {
	path := fmt.Sprintf("/v1/agent/health/service/name/%v", url.PathEscape(service))
	r := a.c.newRequest("GET", path)
	r.params.Add("format", "json")
	r.header.Set("Accept", "application/json")
	_, resp, err := a.c.doRequest(r)
	if err != nil {
		return "", nil, err
	}
	defer resp.Body.Close()
	// Service not Found
	if resp.StatusCode == http.StatusNotFound {
		return HealthCritical, nil, nil
	}
	var out []AgentServiceChecksInfo
	if err := decodeBody(resp, &out); err != nil {
		return HealthCritical, out, err
	}
	switch resp.StatusCode {
	case http.StatusOK:
		return HealthPassing, out, nil
	case http.StatusTooManyRequests:
		return HealthWarning, out, nil
	case http.StatusServiceUnavailable:
		return HealthCritical, out, nil
	}
	return HealthCritical, out, fmt.Errorf("Unexpected Error Code %v for %s", resp.StatusCode, path)
}

// Service returns a locally registered service instance and allows for
// hash-based blocking.
//
// Note that this uses an unconventional blocking mechanism since it's
// agent-local state. That means there is no persistent raft index so we block
// based on object hash instead.
func (a *Agent) Service(serviceID string, q *QueryOptions) (*AgentService, *QueryMeta, error) {
	r := a.c.newRequest("GET", "/v1/agent/service/"+serviceID)
	r.setQueryOptions(q)
	rtt, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, nil, err
	}
	defer resp.Body.Close()

	qm := &QueryMeta{}
	parseQueryMeta(resp, qm)
	qm.RequestTime = rtt

	var out *AgentService
	if err := decodeBody(resp, &out); err != nil {
		return nil, nil, err
	}

	return out, qm, nil
}

// Members returns the known gossip members. The WAN
// flag can be used to query a server for WAN members.
func (a *Agent) Members(wan bool) ([]*AgentMember, error) {
	r := a.c.newRequest("GET", "/v1/agent/members")
	if wan {
		r.params.Set("wan", "1")
	}
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	var out []*AgentMember
	if err := decodeBody(resp, &out); err != nil {
		return nil, err
	}
	return out, nil
}

// MembersOpts returns the known gossip members and can be passed
// additional options for WAN/segment filtering.
func (a *Agent) MembersOpts(opts MembersOpts) ([]*AgentMember, error) {
	r := a.c.newRequest("GET", "/v1/agent/members")
	r.params.Set("segment", opts.Segment)
	if opts.WAN {
		r.params.Set("wan", "1")
	}

	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	var out []*AgentMember
	if err := decodeBody(resp, &out); err != nil {
		return nil, err
	}
	return out, nil
}

// ServiceRegister is used to register a new service with
// the local agent
func (a *Agent) ServiceRegister(service *AgentServiceRegistration) error {
	r := a.c.newRequest("PUT", "/v1/agent/service/register")
	r.obj = service
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	return nil
}

// ServiceDeregister is used to deregister a service with
// the local agent
func (a *Agent) ServiceDeregister(serviceID string) error {
	r := a.c.newRequest("PUT", "/v1/agent/service/deregister/"+serviceID)
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	return nil
}

// 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")
}

// 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")
}

// 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")
}

// 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":
	case "fail":
	default:
		return fmt.Errorf("Invalid status: %s", status)
	}
	endpoint := fmt.Sprintf("/v1/agent/check/%s/%s", status, checkID)
	r := a.c.newRequest("PUT", endpoint)
	r.params.Set("note", note)
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	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 {
	r := a.c.newRequest("PUT", "/v1/agent/check/register")
	r.obj = check
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	return nil
}

// CheckDeregister is used to deregister a check with
// the local agent
func (a *Agent) CheckDeregister(checkID string) error {
	r := a.c.newRequest("PUT", "/v1/agent/check/deregister/"+checkID)
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	return nil
}

// Join is used to instruct the agent to attempt a join to
// another cluster member
func (a *Agent) Join(addr string, wan bool) error {
	r := a.c.newRequest("PUT", "/v1/agent/join/"+addr)
	if wan {
		r.params.Set("wan", "1")
	}
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	return nil
}

// Leave is used to have the agent gracefully leave the cluster and shutdown
func (a *Agent) Leave() error {
	r := a.c.newRequest("PUT", "/v1/agent/leave")
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	return nil
}

// ForceLeave is used to have the agent eject a failed node
func (a *Agent) ForceLeave(node string) error {
	r := a.c.newRequest("PUT", "/v1/agent/force-leave/"+node)
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	return nil
}

// ConnectAuthorize is used to authorize an incoming connection
// to a natively integrated Connect service.
func (a *Agent) ConnectAuthorize(auth *AgentAuthorizeParams) (*AgentAuthorize, error) {
	r := a.c.newRequest("POST", "/v1/agent/connect/authorize")
	r.obj = auth
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	var out AgentAuthorize
	if err := decodeBody(resp, &out); err != nil {
		return nil, err
	}
	return &out, nil
}

// ConnectCARoots returns the list of roots.
func (a *Agent) ConnectCARoots(q *QueryOptions) (*CARootList, *QueryMeta, error) {
	r := a.c.newRequest("GET", "/v1/agent/connect/ca/roots")
	r.setQueryOptions(q)
	rtt, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, nil, err
	}
	defer resp.Body.Close()

	qm := &QueryMeta{}
	parseQueryMeta(resp, qm)
	qm.RequestTime = rtt

	var out CARootList
	if err := decodeBody(resp, &out); err != nil {
		return nil, nil, err
	}
	return &out, qm, nil
}

// ConnectCALeaf gets the leaf certificate for the given service ID.
func (a *Agent) ConnectCALeaf(serviceID string, q *QueryOptions) (*LeafCert, *QueryMeta, error) {
	r := a.c.newRequest("GET", "/v1/agent/connect/ca/leaf/"+serviceID)
	r.setQueryOptions(q)
	rtt, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, nil, err
	}
	defer resp.Body.Close()

	qm := &QueryMeta{}
	parseQueryMeta(resp, qm)
	qm.RequestTime = rtt

	var out LeafCert
	if err := decodeBody(resp, &out); err != nil {
		return nil, nil, err
	}
	return &out, qm, nil
}

// ConnectProxyConfig gets the configuration for a local managed proxy instance.
//
// Note that this uses an unconventional blocking mechanism since it's
// agent-local state. That means there is no persistent raft index so we block
// based on object hash instead.
func (a *Agent) ConnectProxyConfig(proxyServiceID string, q *QueryOptions) (*ConnectProxyConfig, *QueryMeta, error) {
	r := a.c.newRequest("GET", "/v1/agent/connect/proxy/"+proxyServiceID)
	r.setQueryOptions(q)
	rtt, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, nil, err
	}
	defer resp.Body.Close()

	qm := &QueryMeta{}
	parseQueryMeta(resp, qm)
	qm.RequestTime = rtt

	var out ConnectProxyConfig
	if err := decodeBody(resp, &out); err != nil {
		return nil, nil, err
	}
	return &out, qm, nil
}

// EnableServiceMaintenance toggles service maintenance mode on
// for the given service ID.
func (a *Agent) EnableServiceMaintenance(serviceID, reason string) error {
	r := a.c.newRequest("PUT", "/v1/agent/service/maintenance/"+serviceID)
	r.params.Set("enable", "true")
	r.params.Set("reason", reason)
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	return nil
}

// DisableServiceMaintenance toggles service maintenance mode off
// for the given service ID.
func (a *Agent) DisableServiceMaintenance(serviceID string) error {
	r := a.c.newRequest("PUT", "/v1/agent/service/maintenance/"+serviceID)
	r.params.Set("enable", "false")
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	return nil
}

// EnableNodeMaintenance toggles node maintenance mode on for the
// agent we are connected to.
func (a *Agent) EnableNodeMaintenance(reason string) error {
	r := a.c.newRequest("PUT", "/v1/agent/maintenance")
	r.params.Set("enable", "true")
	r.params.Set("reason", reason)
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	return nil
}

// DisableNodeMaintenance toggles node maintenance mode off for the
// agent we are connected to.
func (a *Agent) DisableNodeMaintenance() error {
	r := a.c.newRequest("PUT", "/v1/agent/maintenance")
	r.params.Set("enable", "false")
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return err
	}
	resp.Body.Close()
	return nil
}

// Monitor returns a channel which will receive streaming logs from the agent
// Providing a non-nil stopCh can be used to close the connection and stop the
// log stream. An empty string will be sent down the given channel when there's
// nothing left to stream, after which the caller should close the stopCh.
func (a *Agent) Monitor(loglevel string, stopCh <-chan struct{}, q *QueryOptions) (chan string, error) {
	r := a.c.newRequest("GET", "/v1/agent/monitor")
	r.setQueryOptions(q)
	if loglevel != "" {
		r.params.Add("loglevel", loglevel)
	}
	_, resp, err := requireOK(a.c.doRequest(r))
	if err != nil {
		return nil, err
	}

	logCh := make(chan string, 64)
	go func() {
		defer resp.Body.Close()

		scanner := bufio.NewScanner(resp.Body)
		for {
			select {
			case <-stopCh:
				close(logCh)
				return
			default:
			}
			if scanner.Scan() {
				// An empty string signals to the caller that
				// the scan is done, so make sure we only emit
				// that when the scanner says it's done, not if
				// we happen to ingest an empty line.
				if text := scanner.Text(); text != "" {
					logCh <- text
				} else {
					logCh <- " "
				}
			} else {
				logCh <- ""
			}
		}
	}()

	return logCh, nil
}

// UpdateACLToken updates the agent's "acl_token". See updateToken for more
// details.
//
// DEPRECATED (ACL-Legacy-Compat) - Prefer UpdateDefaultACLToken for v1.4.3 and above
func (a *Agent) UpdateACLToken(token string, q *WriteOptions) (*WriteMeta, error) {
	return a.updateToken("acl_token", token, q)
}

// UpdateACLAgentToken updates the agent's "acl_agent_token". See updateToken
// for more details.
//
// DEPRECATED (ACL-Legacy-Compat) - Prefer UpdateAgentACLToken for v1.4.3 and above
func (a *Agent) UpdateACLAgentToken(token string, q *WriteOptions) (*WriteMeta, error) {
	return a.updateToken("acl_agent_token", token, q)
}

// UpdateACLAgentMasterToken updates the agent's "acl_agent_master_token". See
// updateToken for more details.
//
// DEPRECATED (ACL-Legacy-Compat) - Prefer UpdateAgentMasterACLToken for v1.4.3 and above
func (a *Agent) UpdateACLAgentMasterToken(token string, q *WriteOptions) (*WriteMeta, error) {
	return a.updateToken("acl_agent_master_token", token, q)
}

// UpdateACLReplicationToken updates the agent's "acl_replication_token". See
// updateToken for more details.
//
// DEPRECATED (ACL-Legacy-Compat) - Prefer UpdateReplicationACLToken for v1.4.3 and above
func (a *Agent) UpdateACLReplicationToken(token string, q *WriteOptions) (*WriteMeta, error) {
	return a.updateToken("acl_replication_token", token, q)
}

// UpdateDefaultACLToken updates the agent's "default" token. See updateToken
// for more details
func (a *Agent) UpdateDefaultACLToken(token string, q *WriteOptions) (*WriteMeta, error) {
	return a.updateTokenFallback("default", "acl_token", token, q)
}

// UpdateAgentACLToken updates the agent's "agent" token. See updateToken
// for more details
func (a *Agent) UpdateAgentACLToken(token string, q *WriteOptions) (*WriteMeta, error) {
	return a.updateTokenFallback("agent", "acl_agent_token", token, q)
}

// UpdateAgentMasterACLToken updates the agent's "agent_master" token. See updateToken
// for more details
func (a *Agent) UpdateAgentMasterACLToken(token string, q *WriteOptions) (*WriteMeta, error) {
	return a.updateTokenFallback("agent_master", "acl_agent_master_token", token, q)
}

// UpdateReplicationACLToken updates the agent's "replication" token. See updateToken
// for more details
func (a *Agent) UpdateReplicationACLToken(token string, q *WriteOptions) (*WriteMeta, error) {
	return a.updateTokenFallback("replication", "acl_replication_token", token, q)
}

// updateToken can be used to update one of an agent's ACL tokens after the agent has
// started. The tokens are may not be persisted, so will need to be updated again if
// the agent is restarted unless the agent is configured to persist them.
func (a *Agent) updateToken(target, token string, q *WriteOptions) (*WriteMeta, error) {
	meta, _, err := a.updateTokenOnce(target, token, q)
	return meta, err
}

func (a *Agent) updateTokenFallback(target, fallback, token string, q *WriteOptions) (*WriteMeta, error) {
	meta, status, err := a.updateTokenOnce(target, token, q)
	if err != nil && status == 404 {
		meta, _, err = a.updateTokenOnce(fallback, token, q)
	}
	return meta, err
}

func (a *Agent) updateTokenOnce(target, token string, q *WriteOptions) (*WriteMeta, int, error) {
	r := a.c.newRequest("PUT", fmt.Sprintf("/v1/agent/token/%s", target))
	r.setWriteOptions(q)
	r.obj = &AgentToken{Token: token}

	rtt, resp, err := a.c.doRequest(r)
	if err != nil {
		return nil, 0, err
	}
	defer resp.Body.Close()

	wm := &WriteMeta{RequestTime: rtt}

	if resp.StatusCode != 200 {
		var buf bytes.Buffer
		io.Copy(&buf, resp.Body)
		return wm, resp.StatusCode, fmt.Errorf("Unexpected response code: %d (%s)", resp.StatusCode, buf.Bytes())
	}

	return wm, resp.StatusCode, nil
}