mirror of https://github.com/hashicorp/consul
180 lines
4.8 KiB
Go
180 lines
4.8 KiB
Go
package agent
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import (
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"net/http"
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"sort"
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"strings"
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"github.com/hashicorp/consul/consul/structs"
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)
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// ServiceSummary is used to summarize a service
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type ServiceSummary struct {
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Name string
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Nodes []string
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ChecksPassing int
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ChecksWarning int
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ChecksCritical int
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}
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// UINodes is used to list the nodes in a given datacenter. We return a
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// NodeDump which provides overview information for all the nodes
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func (s *HTTPServer) UINodes(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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// Parse arguments
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args := structs.DCSpecificRequest{}
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if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
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return nil, nil
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}
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// Make the RPC request
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var out structs.IndexedNodeDump
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defer setMeta(resp, &out.QueryMeta)
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RPC:
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if err := s.agent.RPC("Internal.NodeDump", &args, &out); err != nil {
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// Retry the request allowing stale data if no leader
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if strings.Contains(err.Error(), structs.ErrNoLeader.Error()) && !args.AllowStale {
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args.AllowStale = true
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goto RPC
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}
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return nil, err
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}
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// Use empty list instead of nil
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for _, info := range out.Dump {
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if info.Services == nil {
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info.Services = make([]*structs.NodeService, 0)
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}
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if info.Checks == nil {
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info.Checks = make([]*structs.HealthCheck, 0)
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}
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}
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if out.Dump == nil {
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out.Dump = make(structs.NodeDump, 0)
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}
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return out.Dump, nil
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}
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// UINodeInfo is used to get info on a single node in a given datacenter. We return a
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// NodeInfo which provides overview information for the node
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func (s *HTTPServer) UINodeInfo(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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// Parse arguments
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args := structs.NodeSpecificRequest{}
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if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
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return nil, nil
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}
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// Verify we have some DC, or use the default
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args.Node = strings.TrimPrefix(req.URL.Path, "/v1/internal/ui/node/")
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if args.Node == "" {
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resp.WriteHeader(400)
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resp.Write([]byte("Missing node name"))
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return nil, nil
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}
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// Make the RPC request
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var out structs.IndexedNodeDump
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defer setMeta(resp, &out.QueryMeta)
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RPC:
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if err := s.agent.RPC("Internal.NodeInfo", &args, &out); err != nil {
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// Retry the request allowing stale data if no leader
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if strings.Contains(err.Error(), structs.ErrNoLeader.Error()) && !args.AllowStale {
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args.AllowStale = true
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goto RPC
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}
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return nil, err
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}
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// Return only the first entry
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if len(out.Dump) > 0 {
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info := out.Dump[0]
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if info.Services == nil {
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info.Services = make([]*structs.NodeService, 0)
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}
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if info.Checks == nil {
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info.Checks = make([]*structs.HealthCheck, 0)
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}
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return info, nil
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}
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return nil, nil
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}
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// UIServices is used to list the services in a given datacenter. We return a
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// ServiceSummary which provides overview information for the service
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func (s *HTTPServer) UIServices(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
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// Parse arguments
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args := structs.DCSpecificRequest{}
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if done := s.parse(resp, req, &args.Datacenter, &args.QueryOptions); done {
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return nil, nil
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}
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// Make the RPC request
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var out structs.IndexedNodeDump
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defer setMeta(resp, &out.QueryMeta)
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RPC:
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if err := s.agent.RPC("Internal.NodeDump", &args, &out); err != nil {
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// Retry the request allowing stale data if no leader
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if strings.Contains(err.Error(), structs.ErrNoLeader.Error()) && !args.AllowStale {
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args.AllowStale = true
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goto RPC
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}
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return nil, err
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}
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// Generate the summary
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return summarizeServices(out.Dump), nil
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}
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func summarizeServices(dump structs.NodeDump) []*ServiceSummary {
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// Collect the summary information
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var services []string
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summary := make(map[string]*ServiceSummary)
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getService := func(service string) *ServiceSummary {
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serv, ok := summary[service]
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if !ok {
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serv = &ServiceSummary{Name: service}
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summary[service] = serv
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services = append(services, service)
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}
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return serv
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}
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// Aggregate all the node information
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for _, node := range dump {
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nodeServices := make([]*ServiceSummary, len(node.Services))
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for idx, service := range node.Services {
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sum := getService(service.Service)
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sum.Nodes = append(sum.Nodes, node.Node)
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nodeServices[idx] = sum
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}
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for _, check := range node.Checks {
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var services []*ServiceSummary
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if check.ServiceName == "" {
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services = nodeServices
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} else {
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services = []*ServiceSummary{getService(check.ServiceName)}
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}
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for _, sum := range services {
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switch check.Status {
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case structs.HealthPassing:
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sum.ChecksPassing++
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case structs.HealthWarning:
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sum.ChecksWarning++
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case structs.HealthCritical:
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sum.ChecksCritical++
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}
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}
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}
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}
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// Return the services in sorted order
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sort.Strings(services)
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output := make([]*ServiceSummary, len(summary))
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for idx, service := range services {
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// Sort the nodes
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sum := summary[service]
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sort.Strings(sum.Nodes)
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output[idx] = sum
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}
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return output
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}
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