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Implement /v1/agent/health/service/<service name> endpoint (#3551) 

This endpoint aggregates all checks related to <service id> on the agent
and return an appropriate http code + the string describing the worst
check.

This allows to cleanly expose service status to other component, hiding
complexity of multiple checks.
This is especially useful to use consul to feed a load balancer which
would delegate health checking to consul agent.

Exposing this endpoint on the agent is necessary to avoid a hit on
consul servers and avoid decreasing resiliency (this endpoint will work
even if there is no consul leader in the cluster).
This commit is contained in:
Grégoire Seux 2019-01-07 15:39:23 +01:00 committed by Matt Keeler
parent 067346e496
commit 4f62a3b528
12 changed files with 1085 additions and 77 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

230
agent/agent_endpoint.go
View File

@ -20,6 +20,7 @@ import (
"github.com/hashicorp/consul/agent/checks"
"github.com/hashicorp/consul/agent/config"
"github.com/hashicorp/consul/agent/debug"
"github.com/hashicorp/consul/agent/local"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/ipaddr"
@ -153,6 +154,62 @@ func (s *HTTPServer) AgentReload(resp http.ResponseWriter, req *http.Request) (i
}
}
func buildAgentService(s *structs.NodeService, proxies map[string]*local.ManagedProxy) api.AgentService {
weights := api.AgentWeights{Passing: 1, Warning: 1}
if s.Weights != nil {
if s.Weights.Passing > 0 {
weights.Passing = s.Weights.Passing
}
weights.Warning = s.Weights.Warning
}
as := api.AgentService{
Kind: api.ServiceKind(s.Kind),
ID: s.ID,
Service: s.Service,
Tags: s.Tags,
Meta: s.Meta,
Port: s.Port,
Address: s.Address,
EnableTagOverride: s.EnableTagOverride,
CreateIndex: s.CreateIndex,
ModifyIndex: s.ModifyIndex,
Weights: weights,
}
if as.Tags == nil {
as.Tags = []string{}
}
if as.Meta == nil {
as.Meta = map[string]string{}
}
// Attach Unmanaged Proxy config if exists
if s.Kind == structs.ServiceKindConnectProxy {
as.Proxy = s.Proxy.ToAPI()
// DEPRECATED (ProxyDestination) - remove this when removing ProxyDestination
// Also set the deprecated ProxyDestination
as.ProxyDestination = as.Proxy.DestinationServiceName
}
// Attach Connect configs if they exist. We use the actual proxy state since
// that may have had defaults filled in compared to the config that was
// provided with the service as stored in the NodeService here.
if proxy, ok := proxies[s.ID+"-proxy"]; ok {
as.Connect = &api.AgentServiceConnect{
Proxy: &api.AgentServiceConnectProxy{
ExecMode: api.ProxyExecMode(proxy.Proxy.ExecMode.String()),
Command: proxy.Proxy.Command,
Config: proxy.Proxy.Config,
Upstreams: proxy.Proxy.Upstreams.ToAPI(),
},
}
} else if s.Connect.Native {
as.Connect = &api.AgentServiceConnect{
Native: true,
}
}
return as
}
func (s *HTTPServer) AgentServices(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Fetch the ACL token, if any.
var token string
@ -173,59 +230,8 @@ func (s *HTTPServer) AgentServices(resp http.ResponseWriter, req *http.Request)
// Use empty list instead of nil
for id, s := range services {
weights := api.AgentWeights{Passing: 1, Warning: 1}
if s.Weights != nil {
if s.Weights.Passing > 0 {
weights.Passing = s.Weights.Passing
}
weights.Warning = s.Weights.Warning
}
as := &api.AgentService{
Kind: api.ServiceKind(s.Kind),
ID: s.ID,
Service: s.Service,
Tags: s.Tags,
Meta: s.Meta,
Port: s.Port,
Address: s.Address,
EnableTagOverride: s.EnableTagOverride,
CreateIndex: s.CreateIndex,
ModifyIndex: s.ModifyIndex,
Weights: weights,
}
if as.Tags == nil {
as.Tags = []string{}
}
if as.Meta == nil {
as.Meta = map[string]string{}
}
// Attach Unmanaged Proxy config if exists
if s.Kind == structs.ServiceKindConnectProxy {
as.Proxy = s.Proxy.ToAPI()
// DEPRECATED (ProxyDestination) - remove this when removing ProxyDestination
// Also set the deprecated ProxyDestination
as.ProxyDestination = as.Proxy.DestinationServiceName
}
// Attach Connect configs if they exist. We use the actual proxy state since
// that may have had defaults filled in compared to the config that was
// provided with the service as stored in the NodeService here.
if proxy, ok := proxies[id+"-proxy"]; ok {
as.Connect = &api.AgentServiceConnect{
Proxy: &api.AgentServiceConnectProxy{
ExecMode: api.ProxyExecMode(proxy.Proxy.ExecMode.String()),
Command: proxy.Proxy.Command,
Config: proxy.Proxy.Config,
Upstreams: proxy.Proxy.Upstreams.ToAPI(),
},
}
} else if s.Connect.Native {
as.Connect = &api.AgentServiceConnect{
Native: true,
}
}
agentSvcs[id] = as
agentService := buildAgentService(s, proxies)
agentSvcs[id] = &agentService
}
return agentSvcs, nil
@ -704,6 +710,124 @@ func (s *HTTPServer) AgentCheckUpdate(resp http.ResponseWriter, req *http.Reques
return nil, nil
}
// agentHealthService Returns Health for a given service ID
func agentHealthService(serviceID string, s *HTTPServer) (int, string, api.HealthChecks) {
checks := s.agent.State.Checks()
serviceChecks := make(api.HealthChecks, 0)
for _, c := range checks {
if c.ServiceID == serviceID || c.ServiceID == "" {
// TODO: harmonize struct.HealthCheck and api.HealthCheck (or at least extract conversion function)
healthCheck := &api.HealthCheck{
Node: c.Node,
CheckID: string(c.CheckID),
Name: c.Name,
Status: c.Status,
Notes: c.Notes,
Output: c.Output,
ServiceID: c.ServiceID,
ServiceName: c.ServiceName,
ServiceTags: c.ServiceTags,
}
serviceChecks = append(serviceChecks, healthCheck)
}
}
status := serviceChecks.AggregatedStatus()
switch status {
case api.HealthWarning:
return http.StatusTooManyRequests, status, serviceChecks
case api.HealthPassing:
return http.StatusOK, status, serviceChecks
default:
return http.StatusServiceUnavailable, status, serviceChecks
}
}
func returnTextPlain(req *http.Request) bool {
if contentType := req.Header.Get("Accept"); strings.HasPrefix(contentType, "text/plain") {
return true
}
if format := req.URL.Query().Get("format"); format != "" {
return format == "text"
}
return false
}
// AgentHealthServiceByID return the local Service Health given its ID
func (s *HTTPServer) AgentHealthServiceByID(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Pull out the service id (service id since there may be several instance of the same service on this host)
serviceID := strings.TrimPrefix(req.URL.Path, "/v1/agent/health/service/id/")
if serviceID == "" {
return nil, &BadRequestError{Reason: "Missing serviceID"}
}
services := s.agent.State.Services()
proxies := s.agent.State.Proxies()
for _, service := range services {
if service.ID == serviceID {
code, status, healthChecks := agentHealthService(serviceID, s)
if returnTextPlain(req) {
return status, CodeWithPayloadError{StatusCode: code, Reason: status, ContentType: "text/plain"}
}
serviceInfo := buildAgentService(service, proxies)
result := &api.AgentServiceChecksInfo{
AggregatedStatus: status,
Checks: healthChecks,
Service: &serviceInfo,
}
return result, CodeWithPayloadError{StatusCode: code, Reason: status, ContentType: "application/json"}
}
}
notFoundReason := fmt.Sprintf("ServiceId %s not found", serviceID)
if returnTextPlain(req) {
return notFoundReason, CodeWithPayloadError{StatusCode: http.StatusNotFound, Reason: fmt.Sprintf("ServiceId %s not found", serviceID), ContentType: "application/json"}
}
return &api.AgentServiceChecksInfo{
AggregatedStatus: api.HealthCritical,
Checks: nil,
Service: nil,
}, CodeWithPayloadError{StatusCode: http.StatusNotFound, Reason: notFoundReason, ContentType: "application/json"}
}
// AgentHealthServiceByName return the worse status of all the services with given name on an agent
func (s *HTTPServer) AgentHealthServiceByName(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Pull out the service name
serviceName := strings.TrimPrefix(req.URL.Path, "/v1/agent/health/service/name/")
if serviceName == "" {
return nil, &BadRequestError{Reason: "Missing service Name"}
}
code := http.StatusNotFound
status := fmt.Sprintf("ServiceName %s Not Found", serviceName)
services := s.agent.State.Services()
result := make([]api.AgentServiceChecksInfo, 0, 16)
proxies := s.agent.State.Proxies()
for _, service := range services {
if service.Service == serviceName {
scode, sstatus, healthChecks := agentHealthService(service.ID, s)
serviceInfo := buildAgentService(service, proxies)
res := api.AgentServiceChecksInfo{
AggregatedStatus: sstatus,
Checks: healthChecks,
Service: &serviceInfo,
}
result = append(result, res)
// When service is not found, we ignore it and keep existing HTTP status
if code == http.StatusNotFound {
code = scode
status = sstatus
}
// We take the worst of all statuses, so we keep iterating
// passing: 200 < warning: 429 < critical: 503
if code < scode {
code = scode
status = sstatus
}
}
}
if returnTextPlain(req) {
return status, CodeWithPayloadError{StatusCode: code, Reason: status, ContentType: "text/plain"}
}
return result, CodeWithPayloadError{StatusCode: code, Reason: status, ContentType: "application/json"}
}
func (s *HTTPServer) AgentRegisterService(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
var args structs.ServiceDefinition
// Fixup the type decode of TTL or Interval if a check if provided.

438
agent/agent_endpoint_test.go
View File

@ -627,6 +627,444 @@ func TestAgent_Checks(t *testing.T) {
}
}
func TestAgent_HealthServiceByID(t *testing.T) {
t.Parallel()
a := NewTestAgent(t.Name(), "")
defer a.Shutdown()
testrpc.WaitForTestAgent(t, a.RPC, "dc1")
service := &structs.NodeService{
ID: "mysql",
Service: "mysql",
}
if err := a.AddService(service, nil, false, "", ConfigSourceLocal); err != nil {
t.Fatalf("err: %v", err)
}
service = &structs.NodeService{
ID: "mysql2",
Service: "mysql2",
}
if err := a.AddService(service, nil, false, "", ConfigSourceLocal); err != nil {
t.Fatalf("err: %v", err)
}
service = &structs.NodeService{
ID: "mysql3",
Service: "mysql3",
}
if err := a.AddService(service, nil, false, "", ConfigSourceLocal); err != nil {
t.Fatalf("err: %v", err)
}
chk1 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "mysql",
Name: "mysql",
ServiceID: "mysql",
Status: api.HealthPassing,
}
err := a.State.AddCheck(chk1, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
chk2 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "mysql",
Name: "mysql",
ServiceID: "mysql",
Status: api.HealthPassing,
}
err = a.State.AddCheck(chk2, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
chk3 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "mysql2",
Name: "mysql2",
ServiceID: "mysql2",
Status: api.HealthPassing,
}
err = a.State.AddCheck(chk3, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
chk4 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "mysql2",
Name: "mysql2",
ServiceID: "mysql2",
Status: api.HealthWarning,
}
err = a.State.AddCheck(chk4, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
chk5 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "mysql3",
Name: "mysql3",
ServiceID: "mysql3",
Status: api.HealthMaint,
}
err = a.State.AddCheck(chk5, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
chk6 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "mysql3",
Name: "mysql3",
ServiceID: "mysql3",
Status: api.HealthCritical,
}
err = a.State.AddCheck(chk6, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
eval := func(t *testing.T, url string, expectedCode int, expected string) {
t.Helper()
t.Run("format=text", func(t *testing.T) {
t.Helper()
req, _ := http.NewRequest("GET", url+"?format=text", nil)
resp := httptest.NewRecorder()
data, err := a.srv.AgentHealthServiceByID(resp, req)
codeWithPayload, ok := err.(CodeWithPayloadError)
if !ok {
t.Fatalf("Err: %v", err)
}
if got, want := codeWithPayload.StatusCode, expectedCode; got != want {
t.Fatalf("returned bad status: expected %d, but had: %d in %#v", expectedCode, codeWithPayload.StatusCode, codeWithPayload)
}
body, ok := data.(string)
if !ok {
t.Fatalf("Cannot get result as string in := %#v", data)
}
if got, want := body, expected; got != want {
t.Fatalf("got body %q want %q", got, want)
}
if got, want := codeWithPayload.Reason, expected; got != want {
t.Fatalf("got body %q want %q", got, want)
}
})
t.Run("format=json", func(t *testing.T) {
req, _ := http.NewRequest("GET", url, nil)
resp := httptest.NewRecorder()
dataRaw, err := a.srv.AgentHealthServiceByID(resp, req)
codeWithPayload, ok := err.(CodeWithPayloadError)
if !ok {
t.Fatalf("Err: %v", err)
}
if got, want := codeWithPayload.StatusCode, expectedCode; got != want {
t.Fatalf("returned bad status: expected %d, but had: %d in %#v", expectedCode, codeWithPayload.StatusCode, codeWithPayload)
}
data, ok := dataRaw.(*api.AgentServiceChecksInfo)
if !ok {
t.Fatalf("Cannot connvert result to JSON: %#v", dataRaw)
}
if codeWithPayload.StatusCode != http.StatusNotFound {
if data != nil && data.AggregatedStatus != expected {
t.Fatalf("got body %v want %v", data, expected)
}
}
})
}
t.Run("passing checks", func(t *testing.T) {
eval(t, "/v1/agent/health/service/id/mysql", http.StatusOK, "passing")
})
t.Run("warning checks", func(t *testing.T) {
eval(t, "/v1/agent/health/service/id/mysql2", http.StatusTooManyRequests, "warning")
})
t.Run("critical checks", func(t *testing.T) {
eval(t, "/v1/agent/health/service/id/mysql3", http.StatusServiceUnavailable, "critical")
})
t.Run("unknown serviceid", func(t *testing.T) {
eval(t, "/v1/agent/health/service/id/mysql1", http.StatusNotFound, "ServiceId mysql1 not found")
})
nodeCheck := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "diskCheck",
Name: "diskCheck",
Status: api.HealthCritical,
}
err = a.State.AddCheck(nodeCheck, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
t.Run("critical check on node", func(t *testing.T) {
eval(t, "/v1/agent/health/service/id/mysql", http.StatusServiceUnavailable, "critical")
})
err = a.State.RemoveCheck(nodeCheck.CheckID)
if err != nil {
t.Fatalf("Err: %v", err)
}
nodeCheck = &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "_node_maintenance",
Name: "_node_maintenance",
Status: api.HealthMaint,
}
err = a.State.AddCheck(nodeCheck, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
t.Run("maintenance check on node", func(t *testing.T) {
eval(t, "/v1/agent/health/service/id/mysql", http.StatusServiceUnavailable, "maintenance")
})
}
func TestAgent_HealthServiceByName(t *testing.T) {
t.Parallel()
a := NewTestAgent(t.Name(), "")
defer a.Shutdown()
service := &structs.NodeService{
ID: "mysql1",
Service: "mysql-pool-r",
}
if err := a.AddService(service, nil, false, "", ConfigSourceLocal); err != nil {
t.Fatalf("err: %v", err)
}
service = &structs.NodeService{
ID: "mysql2",
Service: "mysql-pool-r",
}
if err := a.AddService(service, nil, false, "", ConfigSourceLocal); err != nil {
t.Fatalf("err: %v", err)
}
service = &structs.NodeService{
ID: "mysql3",
Service: "mysql-pool-rw",
}
if err := a.AddService(service, nil, false, "", ConfigSourceLocal); err != nil {
t.Fatalf("err: %v", err)
}
service = &structs.NodeService{
ID: "mysql4",
Service: "mysql-pool-rw",
}
if err := a.AddService(service, nil, false, "", ConfigSourceLocal); err != nil {
t.Fatalf("err: %v", err)
}
service = &structs.NodeService{
ID: "httpd1",
Service: "httpd",
}
if err := a.AddService(service, nil, false, "", ConfigSourceLocal); err != nil {
t.Fatalf("err: %v", err)
}
service = &structs.NodeService{
ID: "httpd2",
Service: "httpd",
}
if err := a.AddService(service, nil, false, "", ConfigSourceLocal); err != nil {
t.Fatalf("err: %v", err)
}
chk1 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "mysql1",
Name: "mysql1",
ServiceID: "mysql1",
ServiceName: "mysql-pool-r",
Status: api.HealthPassing,
}
err := a.State.AddCheck(chk1, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
chk2 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "mysql1",
Name: "mysql1",
ServiceID: "mysql1",
ServiceName: "mysql-pool-r",
Status: api.HealthWarning,
}
err = a.State.AddCheck(chk2, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
chk3 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "mysql2",
Name: "mysql2",
ServiceID: "mysql2",
ServiceName: "mysql-pool-r",
Status: api.HealthPassing,
}
err = a.State.AddCheck(chk3, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
chk4 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "mysql2",
Name: "mysql2",
ServiceID: "mysql2",
ServiceName: "mysql-pool-r",
Status: api.HealthCritical,
}
err = a.State.AddCheck(chk4, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
chk5 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "mysql3",
Name: "mysql3",
ServiceID: "mysql3",
ServiceName: "mysql-pool-rw",
Status: api.HealthWarning,
}
err = a.State.AddCheck(chk5, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
chk6 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "mysql4",
Name: "mysql4",
ServiceID: "mysql4",
ServiceName: "mysql-pool-rw",
Status: api.HealthPassing,
}
err = a.State.AddCheck(chk6, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
chk7 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "httpd1",
Name: "httpd1",
ServiceID: "httpd1",
ServiceName: "httpd",
Status: api.HealthPassing,
}
err = a.State.AddCheck(chk7, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
chk8 := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "httpd2",
Name: "httpd2",
ServiceID: "httpd2",
ServiceName: "httpd",
Status: api.HealthPassing,
}
err = a.State.AddCheck(chk8, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
eval := func(t *testing.T, url string, expectedCode int, expected string) {
t.Helper()
t.Run("format=text", func(t *testing.T) {
t.Helper()
req, _ := http.NewRequest("GET", url+"?format=text", nil)
resp := httptest.NewRecorder()
data, err := a.srv.AgentHealthServiceByName(resp, req)
codeWithPayload, ok := err.(CodeWithPayloadError)
if !ok {
t.Fatalf("Err: %v", err)
}
if got, want := codeWithPayload.StatusCode, expectedCode; got != want {
t.Fatalf("returned bad status: %d. Body: %q", resp.Code, resp.Body.String())
}
if got, want := codeWithPayload.Reason, expected; got != want {
t.Fatalf("got reason %q want %q", got, want)
}
if got, want := data, expected; got != want {
t.Fatalf("got body %q want %q", got, want)
}
})
t.Run("format=json", func(t *testing.T) {
t.Helper()
req, _ := http.NewRequest("GET", url, nil)
resp := httptest.NewRecorder()
dataRaw, err := a.srv.AgentHealthServiceByName(resp, req)
codeWithPayload, ok := err.(CodeWithPayloadError)
if !ok {
t.Fatalf("Err: %v", err)
}
data, ok := dataRaw.([]api.AgentServiceChecksInfo)
if !ok {
t.Fatalf("Cannot connvert result to JSON")
}
if got, want := codeWithPayload.StatusCode, expectedCode; got != want {
t.Fatalf("returned bad code: %d. Body: %#v", resp.Code, data)
}
if resp.Code != http.StatusNotFound {
if codeWithPayload.Reason != expected {
t.Fatalf("got wrong status %#v want %#v", codeWithPayload, expected)
}
}
})
}
t.Run("passing checks", func(t *testing.T) {
eval(t, "/v1/agent/health/service/name/httpd", http.StatusOK, "passing")
})
t.Run("warning checks", func(t *testing.T) {
eval(t, "/v1/agent/health/service/name/mysql-pool-rw", http.StatusTooManyRequests, "warning")
})
t.Run("critical checks", func(t *testing.T) {
eval(t, "/v1/agent/health/service/name/mysql-pool-r", http.StatusServiceUnavailable, "critical")
})
t.Run("unknown serviceName", func(t *testing.T) {
eval(t, "/v1/agent/health/service/name/test", http.StatusNotFound, "ServiceName test Not Found")
})
nodeCheck := &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "diskCheck",
Name: "diskCheck",
Status: api.HealthCritical,
}
err = a.State.AddCheck(nodeCheck, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
t.Run("critical check on node", func(t *testing.T) {
eval(t, "/v1/agent/health/service/name/mysql-pool-r", http.StatusServiceUnavailable, "critical")
})
err = a.State.RemoveCheck(nodeCheck.CheckID)
if err != nil {
t.Fatalf("Err: %v", err)
}
nodeCheck = &structs.HealthCheck{
Node: a.Config.NodeName,
CheckID: "_node_maintenance",
Name: "_node_maintenance",
Status: api.HealthMaint,
}
err = a.State.AddCheck(nodeCheck, "")
if err != nil {
t.Fatalf("Err: %v", err)
}
t.Run("maintenance check on node", func(t *testing.T) {
eval(t, "/v1/agent/health/service/name/mysql-pool-r", http.StatusServiceUnavailable, "maintenance")
})
}
func TestAgent_Checks_ACLFilter(t *testing.T) {
t.Parallel()
a := NewTestAgent(t.Name(), TestACLConfig())

3
agent/catalog_endpoint_test.go
View File

@ -740,6 +740,7 @@ func TestCatalogServiceNodes_DistanceSort(t *testing.T) {
t.Parallel()
a := NewTestAgent(t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register nodes.
args := &structs.RegisterRequest{
@ -831,6 +832,7 @@ func TestCatalogServiceNodes_ConnectProxy(t *testing.T) {
assert := assert.New(t)
a := NewTestAgent(t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register
args := structs.TestRegisterRequestProxy(t)
@ -860,6 +862,7 @@ func TestCatalogConnectServiceNodes_good(t *testing.T) {
assert := assert.New(t)
a := NewTestAgent(t.Name(), "")
defer a.Shutdown()
testrpc.WaitForLeader(t, a.RPC, "dc1")
// Register
args := structs.TestRegisterRequestProxy(t)

50
agent/http.go
View File

@ -42,6 +42,18 @@ func (e BadRequestError) Error() string {
return fmt.Sprintf("Bad request: %s", e.Reason)
}
// CodeWithPayloadError allow returning non HTTP 200
// Error codes while not returning PlainText payload
type CodeWithPayloadError struct {
Reason string
StatusCode int
ContentType string
}
func (e CodeWithPayloadError) Error() string {
return e.Reason
}
// HTTPServer provides an HTTP api for an agent.
type HTTPServer struct {
*http.Server
@ -364,21 +376,41 @@ func (s *HTTPServer) wrap(handler endpoint, methods []string) http.HandlerFunc {
// Invoke the handler
obj, err = handler(resp, req)
}
contentType := "application/json"
httpCode := http.StatusOK
if err != nil {
handleErr(err)
return
if errPayload, ok := err.(CodeWithPayloadError); ok {
httpCode = errPayload.StatusCode
if errPayload.ContentType != "" {
contentType = errPayload.ContentType
}
if errPayload.Reason != "" {
resp.Header().Add("X-Consul-Reason", errPayload.Reason)
}
} else {
handleErr(err)
return
}
}
if obj == nil {
return
}
buf, err := s.marshalJSON(req, obj)
if err != nil {
handleErr(err)
return
var buf []byte
if contentType == "application/json" {
buf, err = s.marshalJSON(req, obj)
if err != nil {
handleErr(err)
return
}
} else {
if strings.HasPrefix(contentType, "text/") {
if val, ok := obj.(string); ok {
buf = []byte(val)
}
}
}
resp.Header().Set("Content-Type", "application/json")
resp.Header().Set("Content-Type", contentType)
resp.WriteHeader(httpCode)
resp.Write(buf)
}
}

2
agent/http_oss.go
View File

@ -34,6 +34,8 @@ func init() {
registerEndpoint("/v1/agent/join/", []string{"PUT"}, (*HTTPServer).AgentJoin)
registerEndpoint("/v1/agent/leave", []string{"PUT"}, (*HTTPServer).AgentLeave)
registerEndpoint("/v1/agent/force-leave/", []string{"PUT"}, (*HTTPServer).AgentForceLeave)
registerEndpoint("/v1/agent/health/service/id/", []string{"GET"}, (*HTTPServer).AgentHealthServiceByID)
registerEndpoint("/v1/agent/health/service/name/", []string{"GET"}, (*HTTPServer).AgentHealthServiceByName)
registerEndpoint("/v1/agent/check/register", []string{"PUT"}, (*HTTPServer).AgentRegisterCheck)
registerEndpoint("/v1/agent/check/deregister/", []string{"PUT"}, (*HTTPServer).AgentDeregisterCheck)
registerEndpoint("/v1/agent/check/pass/", []string{"PUT"}, (*HTTPServer).AgentCheckPass)

5
agent/structs/errors.go
View File

@ -12,6 +12,7 @@ const (
errNotReadyForConsistentReads = "Not ready to serve consistent reads"
errSegmentsNotSupported = "Network segments are not supported in this version of Consul"
errRPCRateExceeded = "RPC rate limit exceeded"
errServiceNotFound = "Service not found: "
)
var (
@ -30,3 +31,7 @@ func IsErrNoLeader(err error) bool {
func IsErrRPCRateExceeded(err error) bool {
return err != nil && strings.Contains(err.Error(), errRPCRateExceeded)
}
func IsErrServiceNotFound(err error) bool {
return err != nil && strings.Contains(err.Error(), errServiceNotFound)
}

76
api/agent.go
View File

@ -3,6 +3,8 @@ package api
import (
"bufio"
"fmt"
"net/http"
"net/url"
)
// ServiceKind is the kind of service being registered.
@ -89,6 +91,13 @@ type AgentService struct {
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"`
@ -407,6 +416,73 @@ func (a *Agent) Services() (map[string]*AgentService, error) {
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.
//

119
api/agent_test.go
View File

@ -1,6 +1,7 @@
package api
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
@ -170,6 +171,7 @@ func TestAPI_AgentServices(t *testing.T) {
reg := &AgentServiceRegistration{
Name: "foo",
ID: "foo",
Tags: []string{"bar", "baz"},
Port: 8000,
Check: &AgentServiceCheck{
@ -185,7 +187,7 @@ func TestAPI_AgentServices(t *testing.T) {
t.Fatalf("err: %v", err)
}
if _, ok := services["foo"]; !ok {
t.Fatalf("missing service: %v", services)
t.Fatalf("missing service: %#v", services)
}
checks, err := agent.Checks()
if err != nil {
@ -201,6 +203,23 @@ func TestAPI_AgentServices(t *testing.T) {
t.Fatalf("Bad: %#v", chk)
}
state, out, err := agent.AgentHealthServiceByID("foo2")
require.Nil(t, err)
require.Nil(t, out)
require.Equal(t, HealthCritical, state)
state, out, err = agent.AgentHealthServiceByID("foo")
require.Nil(t, err)
require.NotNil(t, out)
require.Equal(t, HealthCritical, state)
require.Equal(t, 8000, out.Service.Port)
state, outs, err := agent.AgentHealthServiceByName("foo")
require.Nil(t, err)
require.NotNil(t, outs)
require.Equal(t, HealthCritical, state)
require.Equal(t, 8000, out.Service.Port)
if err := agent.ServiceDeregister("foo"); err != nil {
t.Fatalf("err: %v", err)
}
@ -1368,3 +1387,101 @@ func TestAPI_AgentConnectProxyConfig(t *testing.T) {
require.Equal(t, expectConfig, config)
require.Equal(t, expectConfig.ContentHash, qm.LastContentHash)
}
func TestAPI_AgentHealthService(t *testing.T) {
t.Parallel()
c, s := makeClient(t)
defer s.Stop()
agent := c.Agent()
requireServiceHealthID := func(t *testing.T, serviceID, expected string, shouldExist bool) {
msg := fmt.Sprintf("service id:%s, shouldExist:%v, expectedStatus:%s : bad %%s", serviceID, shouldExist, expected)
state, out, err := agent.AgentHealthServiceByID(serviceID)
require.Nil(t, err, msg, "err")
require.Equal(t, expected, state, msg, "state")
if !shouldExist {
require.Nil(t, out, msg, "shouldExist")
} else {
require.NotNil(t, out, msg, "output")
require.Equal(t, serviceID, out.Service.ID, msg, "output")
}
}
requireServiceHealthName := func(t *testing.T, serviceName, expected string, shouldExist bool) {
msg := fmt.Sprintf("service name:%s, shouldExist:%v, expectedStatus:%s : bad %%s", serviceName, shouldExist, expected)
state, outs, err := agent.AgentHealthServiceByName(serviceName)
require.Nil(t, err, msg, "err")
require.Equal(t, expected, state, msg, "state")
if !shouldExist {
require.Equal(t, 0, len(outs), msg, "output")
} else {
require.True(t, len(outs) > 0, msg, "output")
for _, o := range outs {
require.Equal(t, serviceName, o.Service.Service, msg, "output")
}
}
}
requireServiceHealthID(t, "_i_do_not_exist_", HealthCritical, false)
requireServiceHealthName(t, "_i_do_not_exist_", HealthCritical, false)
testServiceID1 := "foo"
testServiceID2 := "foofoo"
testServiceName := "bar"
// register service
reg := &AgentServiceRegistration{
Name: testServiceName,
ID: testServiceID1,
Port: 8000,
Check: &AgentServiceCheck{
TTL: "15s",
},
}
err := agent.ServiceRegister(reg)
require.Nil(t, err)
requireServiceHealthID(t, testServiceID1, HealthCritical, true)
requireServiceHealthName(t, testServiceName, HealthCritical, true)
err = agent.WarnTTL(fmt.Sprintf("service:%s", testServiceID1), "I am warn")
require.Nil(t, err)
requireServiceHealthName(t, testServiceName, HealthWarning, true)
requireServiceHealthID(t, testServiceID1, HealthWarning, true)
err = agent.PassTTL(fmt.Sprintf("service:%s", testServiceID1), "I am good :)")
require.Nil(t, err)
requireServiceHealthName(t, testServiceName, HealthPassing, true)
requireServiceHealthID(t, testServiceID1, HealthPassing, true)
err = agent.FailTTL(fmt.Sprintf("service:%s", testServiceID1), "I am dead.")
require.Nil(t, err)
requireServiceHealthName(t, testServiceName, HealthCritical, true)
requireServiceHealthID(t, testServiceID1, HealthCritical, true)
// register another service
reg = &AgentServiceRegistration{
Name: testServiceName,
ID: testServiceID2,
Port: 8000,
Check: &AgentServiceCheck{
TTL: "15s",
},
}
err = agent.ServiceRegister(reg)
require.Nil(t, err)
requireServiceHealthName(t, testServiceName, HealthCritical, true)
err = agent.PassTTL(fmt.Sprintf("service:%s", testServiceID1), "I am good :)")
require.Nil(t, err)
requireServiceHealthName(t, testServiceName, HealthCritical, true)
err = agent.WarnTTL(fmt.Sprintf("service:%s", testServiceID2), "I am warn")
require.Nil(t, err)
requireServiceHealthName(t, testServiceName, HealthWarning, true)
err = agent.PassTTL(fmt.Sprintf("service:%s", testServiceID2), "I am good :)")
require.Nil(t, err)
requireServiceHealthName(t, testServiceName, HealthPassing, true)
}

2
api/api.go
View File

@ -773,7 +773,7 @@ func (c *Client) doRequest(r *request) (time.Duration, *http.Response, error) {
func (c *Client) query(endpoint string, out interface{}, q *QueryOptions) (*QueryMeta, error) {
r := c.newRequest("GET", endpoint)
r.setQueryOptions(q)
rtt, resp, err := requireOK(c.doRequest(r))
rtt, resp, err := c.doRequest(r)
if err != nil {
return nil, err
}

20
command/connect/proxy/register_test.go
View File

@ -46,16 +46,18 @@ func TestRegisterMonitor_heartbeat(t *testing.T) {
testrpc.WaitForTestAgent(t, a.RPC, "dc1")
m, _ := testMonitor(t, client)
defer m.Close()
// Get the check and verify that it is passing
checks, err := client.Agent().Checks()
require.NoError(err)
require.Contains(checks, m.checkID())
require.Equal("passing", checks[m.checkID()].Status)
// Purposely fail the TTL check, verify it becomes healthy again
require.NoError(client.Agent().FailTTL(m.checkID(), ""))
retry.Run(t, func(r *retry.R) {
// Get the check and verify that it is passing
checks, err := client.Agent().Checks()
require.NoError(err)
require.Contains(checks, m.checkID())
require.Equal("passing", checks[m.checkID()].Status)
// Purposely fail the TTL check, verify it becomes healthy again
require.NoError(client.Agent().FailTTL(m.checkID(), ""))
})
retry.Run(t, func(r *retry.R) {
checks, err := client.Agent().Checks()
if err != nil {
r.Fatalf("err: %s", err)

3
command/watch/watch_test.go
View File

@ -4,9 +4,8 @@ import (
"strings"
"testing"
"github.com/hashicorp/consul/testrpc"
"github.com/hashicorp/consul/agent"
"github.com/hashicorp/consul/testrpc"
"github.com/mitchellh/cli"
)

214
website/source/api/agent/service.html.md
View File

@ -151,6 +151,216 @@ contains the [hash-based blocking
query](/api/index.html#hash-based-blocking-queries) hash for the result. The
same hash is also present in `X-Consul-ContentHash`.
## Get local service health
Retrieve an aggregated state of service(s) on the local agent by name.
This endpoints support JSON format and text/plain formats, JSON being the
default. In order to get the text format, you can append `?format=text` to
the URL or use Mime Content negotiation by specifying a HTTP Header
`Accept` starting with `text/plain`.
| Method | Path | Produces |
| ------ | --------------------------------------------------------- | ------------------ |
| `GET` | `/v1/agent/health/service/name/:service_name` | `application/json` |
| `GET` | `/v1/agent/health/service/name/:service_name?format=text` | `text/plain` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries),
[consistency modes](/api/index.html#consistency-modes),
[agent caching](/api/index.html#agent-caching), and
[required ACLs](/api/index.html#acls).
| Blocking Queries | Consistency Modes | Agent Caching | ACL Required |
| ---------------- | ----------------- | ------------- | -------------- |
| `NO` | `none` | `none` | `service:read` |
Those endpoints return the aggregated values of all healthchecks for the
service instance(s) and will return the corresponding HTTP codes:
| Result | Meaning |
| ------ | ----------------------------------------------------------------|
| `200` | All healthchecks of every matching service instance are passing |
| `400` | Bad parameter (missing service name of id) |
| `404` | No such service id or name |
| `429` | Some healthchecks are passing, at least one is warning |
| `503` | At least one of the healthchecks is critical |
Those endpoints might be usefull for the following use-cases:
* a load-balancer wants to check IP connectivity with an agent and retrieve
the aggregated status of given service
* create aliases for a given service (thus, the healthcheck of alias uses
http://localhost:8500/v1/agent/service/id/aliased_service_id healthcheck)
##### Note
If you know the ID of service you want to target, it is recommended to use
[`/v1/agent/health/service/id/:service_id`](/api/service.html#get-local-service-health-by-id)
so you have the result for the service only. When requesting
`/v1/agent/health/service/name/:service_name`, the caller will receive the
worst state of all services having the given name.
### Sample Requests
Given 2 services with name `web`, with web2 critical and web1 passing:
#### List worst statuses of all instances of web-demo services (HTTP 503)
##### By Name, Text
```shell
curl http://localhost:8500/v1/agent/health/service/name/web?format=text
critical
```
##### By Name, JSON
In JSON, the detail of passing/warning/critical services is present in output,
in a array.
```shell
curl localhost:8500/v1/agent/health/service/name/web
```
```json
{
"critical": [
{
"ID": "web2",
"Service": "web",
"Tags": [
"rails"
],
"Address": "",
"Meta": null,
"Port": 80,
"EnableTagOverride": false,
"ProxyDestination": "",
"Connect": {
"Native": false,
"Proxy": null
},
"CreateIndex": 0,
"ModifyIndex": 0
}
],
"passing": [
{
"ID": "web1",
"Service": "web",
"Tags": [
"rails"
],
"Address": "",
"Meta": null,
"Port": 80,
"EnableTagOverride": false,
"ProxyDestination": "",
"Connect": {
"Native": false,
"Proxy": null
},
"CreateIndex": 0,
"ModifyIndex": 0
}
]
}
```
#### List status of web2 (HTTP 503)
##### Failure By ID, Text
```shell
curl http://localhost:8500/v1/agent/health/service/id/web2?format=text
critical
```
##### Failure By ID, JSON
In JSON, the output per ID is not an array, but only contains the value
of service.
```shell
curl localhost:8500/v1/agent/health/service/id/web2
```
```json
{
"critical": {
"ID": "web2",
"Service": "web",
"Tags": [
"rails"
],
"Address": "",
"Meta": null,
"Port": 80,
"EnableTagOverride": false,
"ProxyDestination": "",
"Connect": {
"Native": false,
"Proxy": null
},
"CreateIndex": 0,
"ModifyIndex": 0
}
}
```
#### List status of web2 (HTTP 200)
##### Success By ID, Text
```shell
curl localhost:8500/v1/agent/health/service/id/web1?format=text
passing
```
#### Success By ID, JSON
```shell
curl localhost:8500/v1/agent/health/service/id/web1
```
```json
{
"passing": {
"ID": "web1",
"Service": "web",
"Tags": [
"rails"
],
"Address": "",
"Meta": null,
"Port": 80,
"EnableTagOverride": false,
"ProxyDestination": "",
"Connect": {
"Native": false,
"Proxy": null
},
"CreateIndex": 0,
"ModifyIndex": 0
}
}
```
## Get local service health by its ID
Retrive an aggregated state of service(s) on the local agent by ID.
See:
| Method | Path | Produces |
| ------ | ------------------------------------------------------ | ------------------ |
| `GET` | `/v1/agent/health/service/id/:service_id` | `application/json` |
| `GET` | `/v1/agent/health/service/id/:service_id?format=text` | `text/plain` |
Parameters and response format are the same as
[`/v1/agent/health/service/name/:service_name`](/api/service.html#get-local-service-health).
## Register Service
This endpoint adds a new service, with an optional health check, to the local
@ -216,8 +426,8 @@ service definition keys for compatibility with the config file format.
Connect proxy instance. This is only valid if `Kind == "connect-proxy"`. See
the [Proxy documentation](/docs/connect/proxies.html) for full details.
- `Connect` `(Connect: nil)` - Specifies the
[configuration for Connect](/docs/connect/configuration.html). See the
- `Connect` `(Connect: nil)` - Specifies the
[configuration for Connect](/docs/connect/configuration.html). See the
[Connect Structure](#connect-structure) section below for supported fields.
- `Check` `(Check: nil)` - Specifies a check. Please see the