open-consul/agent/ui_endpoint.go

250 lines
7.0 KiB
Go

package agent
import (
"fmt"
"net/http"
"sort"
"strings"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/api"
)
// metaExternalSource is the key name for the service instance meta that
// defines the external syncing source. This is used by the UI APIs below
// to extract this.
const metaExternalSource = "external-source"
// ServiceSummary is used to summarize a service
type ServiceSummary struct {
Kind structs.ServiceKind `json:",omitempty"`
Name string
Tags []string
Nodes []string
InstanceCount int
ProxyFor []string `json:",omitempty"`
proxyForSet map[string]struct{} // internal to track uniqueness
ChecksPassing int
ChecksWarning int
ChecksCritical int
ExternalSources []string
externalSourceSet map[string]struct{} // internal to track uniqueness
structs.EnterpriseMeta
}
// UINodes is used to list the nodes in a given datacenter. We return a
// NodeDump which provides overview information for all the nodes
func (s *HTTPServer) UINodes(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Parse arguments
args := structs.DCSpecificRequest{}
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
if err := s.parseEntMeta(req, &args.EnterpriseMeta); err != nil {
return nil, err
}
s.parseFilter(req, &args.Filter)
// Make the RPC request
var out structs.IndexedNodeDump
defer setMeta(resp, &out.QueryMeta)
RPC:
if err := s.agent.RPC("Internal.NodeDump", &args, &out); err != nil {
// Retry the request allowing stale data if no leader
if strings.Contains(err.Error(), structs.ErrNoLeader.Error()) && !args.AllowStale {
args.AllowStale = true
goto RPC
}
return nil, err
}
// Use empty list instead of nil
for _, info := range out.Dump {
if info.Services == nil {
info.Services = make([]*structs.NodeService, 0)
}
if info.Checks == nil {
info.Checks = make([]*structs.HealthCheck, 0)
}
}
if out.Dump == nil {
out.Dump = make(structs.NodeDump, 0)
}
return out.Dump, nil
}
// UINodeInfo is used to get info on a single node in a given datacenter. We return a
// NodeInfo which provides overview information for the node
func (s *HTTPServer) UINodeInfo(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Parse arguments
args := structs.NodeSpecificRequest{}
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
if err := s.parseEntMeta(req, &args.EnterpriseMeta); err != nil {
return nil, err
}
// Verify we have some DC, or use the default
args.Node = strings.TrimPrefix(req.URL.Path, "/v1/internal/ui/node/")
if args.Node == "" {
resp.WriteHeader(http.StatusBadRequest)
fmt.Fprint(resp, "Missing node name")
return nil, nil
}
// Make the RPC request
var out structs.IndexedNodeDump
defer setMeta(resp, &out.QueryMeta)
RPC:
if err := s.agent.RPC("Internal.NodeInfo", &args, &out); err != nil {
// Retry the request allowing stale data if no leader
if strings.Contains(err.Error(), structs.ErrNoLeader.Error()) && !args.AllowStale {
args.AllowStale = true
goto RPC
}
return nil, err
}
// Return only the first entry
if len(out.Dump) > 0 {
info := out.Dump[0]
if info.Services == nil {
info.Services = make([]*structs.NodeService, 0)
}
if info.Checks == nil {
info.Checks = make([]*structs.HealthCheck, 0)
}
return info, nil
}
resp.WriteHeader(http.StatusNotFound)
return nil, nil
}
// UIServices is used to list the services in a given datacenter. We return a
// ServiceSummary which provides overview information for the service
func (s *HTTPServer) UIServices(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
// Parse arguments
args := structs.ServiceDumpRequest{}
if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
return nil, nil
}
if err := s.parseEntMeta(req, &args.EnterpriseMeta); err != nil {
return nil, err
}
s.parseFilter(req, &args.Filter)
// Make the RPC request
var out structs.IndexedCheckServiceNodes
defer setMeta(resp, &out.QueryMeta)
RPC:
if err := s.agent.RPC("Internal.ServiceDump", &args, &out); err != nil {
// Retry the request allowing stale data if no leader
if strings.Contains(err.Error(), structs.ErrNoLeader.Error()) && !args.AllowStale {
args.AllowStale = true
goto RPC
}
return nil, err
}
// Generate the summary
return summarizeServices(out.Nodes), nil
}
func summarizeServices(dump structs.CheckServiceNodes) []*ServiceSummary {
// Collect the summary information
var services []structs.ServiceID
summary := make(map[structs.ServiceID]*ServiceSummary)
getService := func(service structs.ServiceID) *ServiceSummary {
serv, ok := summary[service]
if !ok {
serv = &ServiceSummary{
Name: service.ID,
EnterpriseMeta: service.EnterpriseMeta,
// the other code will increment this unconditionally so we
// shouldn't initialize it to 1
InstanceCount: 0,
}
summary[service] = serv
services = append(services, service)
}
return serv
}
for _, csn := range dump {
svc := csn.Service
sum := getService(structs.NewServiceID(svc.Service, &svc.EnterpriseMeta))
sum.Nodes = append(sum.Nodes, csn.Node.Node)
sum.Kind = svc.Kind
sum.InstanceCount += 1
if svc.Kind == structs.ServiceKindConnectProxy {
if _, ok := sum.proxyForSet[svc.Proxy.DestinationServiceName]; !ok {
if sum.proxyForSet == nil {
sum.proxyForSet = make(map[string]struct{})
}
sum.proxyForSet[svc.Proxy.DestinationServiceName] = struct{}{}
sum.ProxyFor = append(sum.ProxyFor, svc.Proxy.DestinationServiceName)
}
}
for _, tag := range svc.Tags {
found := false
for _, existing := range sum.Tags {
if existing == tag {
found = true
break
}
}
if !found {
sum.Tags = append(sum.Tags, tag)
}
}
// If there is an external source, add it to the list of external
// sources. We only want to add unique sources so there is extra
// accounting here with an unexported field to maintain the set
// of sources.
if len(svc.Meta) > 0 && svc.Meta[metaExternalSource] != "" {
source := svc.Meta[metaExternalSource]
if sum.externalSourceSet == nil {
sum.externalSourceSet = make(map[string]struct{})
}
if _, ok := sum.externalSourceSet[source]; !ok {
sum.externalSourceSet[source] = struct{}{}
sum.ExternalSources = append(sum.ExternalSources, source)
}
}
for _, check := range csn.Checks {
switch check.Status {
case api.HealthPassing:
sum.ChecksPassing++
case api.HealthWarning:
sum.ChecksWarning++
case api.HealthCritical:
sum.ChecksCritical++
}
}
}
// Return the services in sorted order
sort.Slice(services, func(i, j int) bool {
return services[i].LessThan(&services[j])
})
output := make([]*ServiceSummary, len(summary))
for idx, service := range services {
// Sort the nodes
sum := summary[service]
sort.Strings(sum.Nodes)
output[idx] = sum
}
return output
}