open-consul/agent/consul/health_endpoint.go

195 lines
5.9 KiB
Go

package consul
import (
"fmt"
"github.com/armon/go-metrics"
"github.com/hashicorp/consul/agent/consul/state"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/go-memdb"
)
// Health endpoint is used to query the health information
type Health struct {
srv *Server
}
// ChecksInState is used to get all the checks in a given state
func (h *Health) ChecksInState(args *structs.ChecksInStateRequest,
reply *structs.IndexedHealthChecks) error {
if done, err := h.srv.forward("Health.ChecksInState", args, args, reply); done {
return err
}
return h.srv.blockingQuery(
&args.QueryOptions,
&reply.QueryMeta,
func(ws memdb.WatchSet, state *state.Store) error {
var index uint64
var checks structs.HealthChecks
var err error
if len(args.NodeMetaFilters) > 0 {
index, checks, err = state.ChecksInStateByNodeMeta(ws, args.State, args.NodeMetaFilters)
} else {
index, checks, err = state.ChecksInState(ws, args.State)
}
if err != nil {
return err
}
reply.Index, reply.HealthChecks = index, checks
if err := h.srv.filterACL(args.Token, reply); err != nil {
return err
}
return h.srv.sortNodesByDistanceFrom(args.Source, reply.HealthChecks)
})
}
// NodeChecks is used to get all the checks for a node
func (h *Health) NodeChecks(args *structs.NodeSpecificRequest,
reply *structs.IndexedHealthChecks) error {
if done, err := h.srv.forward("Health.NodeChecks", args, args, reply); done {
return err
}
return h.srv.blockingQuery(
&args.QueryOptions,
&reply.QueryMeta,
func(ws memdb.WatchSet, state *state.Store) error {
index, checks, err := state.NodeChecks(ws, args.Node)
if err != nil {
return err
}
reply.Index, reply.HealthChecks = index, checks
return h.srv.filterACL(args.Token, reply)
})
}
// ServiceChecks is used to get all the checks for a service
func (h *Health) ServiceChecks(args *structs.ServiceSpecificRequest,
reply *structs.IndexedHealthChecks) error {
// Reject if tag filtering is on
if args.TagFilter {
return fmt.Errorf("Tag filtering is not supported")
}
// Potentially forward
if done, err := h.srv.forward("Health.ServiceChecks", args, args, reply); done {
return err
}
return h.srv.blockingQuery(
&args.QueryOptions,
&reply.QueryMeta,
func(ws memdb.WatchSet, state *state.Store) error {
var index uint64
var checks structs.HealthChecks
var err error
if len(args.NodeMetaFilters) > 0 {
index, checks, err = state.ServiceChecksByNodeMeta(ws, args.ServiceName, args.NodeMetaFilters)
} else {
index, checks, err = state.ServiceChecks(ws, args.ServiceName)
}
if err != nil {
return err
}
reply.Index, reply.HealthChecks = index, checks
if err := h.srv.filterACL(args.Token, reply); err != nil {
return err
}
return h.srv.sortNodesByDistanceFrom(args.Source, reply.HealthChecks)
})
}
// ServiceNodes returns all the nodes registered as part of a service including health info
func (h *Health) ServiceNodes(args *structs.ServiceSpecificRequest, reply *structs.IndexedCheckServiceNodes) error {
if done, err := h.srv.forward("Health.ServiceNodes", args, args, reply); done {
return err
}
// Verify the arguments
if args.ServiceName == "" {
return fmt.Errorf("Must provide service name")
}
// Determine the function we'll call
var f func(memdb.WatchSet, *state.Store, *structs.ServiceSpecificRequest) (uint64, structs.CheckServiceNodes, error)
switch {
case args.Connect:
f = h.serviceNodesConnect
case args.TagFilter:
f = h.serviceNodesTagFilter
default:
f = h.serviceNodesDefault
}
// If we're doing a connect query, we need read access to the service
// we're trying to find proxies for, so check that.
if args.Connect {
// Fetch the ACL token, if any.
rule, err := h.srv.resolveToken(args.Token)
if err != nil {
return err
}
if rule != nil && !rule.ServiceRead(args.ServiceName) {
// Just return nil, which will return an empty response (tested)
return nil
}
}
err := h.srv.blockingQuery(
&args.QueryOptions,
&reply.QueryMeta,
func(ws memdb.WatchSet, state *state.Store) error {
index, nodes, err := f(ws, state, args)
if err != nil {
return err
}
reply.Index, reply.Nodes = index, nodes
if len(args.NodeMetaFilters) > 0 {
reply.Nodes = nodeMetaFilter(args.NodeMetaFilters, reply.Nodes)
}
if err := h.srv.filterACL(args.Token, reply); err != nil {
return err
}
return h.srv.sortNodesByDistanceFrom(args.Source, reply.Nodes)
})
// Provide some metrics
if err == nil {
// For metrics, we separate Connect-based lookups from non-Connect
key := "service"
if args.Connect {
key = "connect"
}
metrics.IncrCounterWithLabels([]string{"health", key, "query"}, 1,
[]metrics.Label{{Name: "service", Value: args.ServiceName}})
if args.ServiceTag != "" {
metrics.IncrCounterWithLabels([]string{"health", key, "query-tag"}, 1,
[]metrics.Label{{Name: "service", Value: args.ServiceName}, {Name: "tag", Value: args.ServiceTag}})
}
if len(reply.Nodes) == 0 {
metrics.IncrCounterWithLabels([]string{"health", key, "not-found"}, 1,
[]metrics.Label{{Name: "service", Value: args.ServiceName}})
}
}
return err
}
// The serviceNodes* functions below are the various lookup methods that
// can be used by the ServiceNodes endpoint.
func (h *Health) serviceNodesConnect(ws memdb.WatchSet, s *state.Store, args *structs.ServiceSpecificRequest) (uint64, structs.CheckServiceNodes, error) {
return s.CheckConnectServiceNodes(ws, args.ServiceName)
}
func (h *Health) serviceNodesTagFilter(ws memdb.WatchSet, s *state.Store, args *structs.ServiceSpecificRequest) (uint64, structs.CheckServiceNodes, error) {
return s.CheckServiceTagNodes(ws, args.ServiceName, args.ServiceTag)
}
func (h *Health) serviceNodesDefault(ws memdb.WatchSet, s *state.Store, args *structs.ServiceSpecificRequest) (uint64, structs.CheckServiceNodes, error) {
return s.CheckServiceNodes(ws, args.ServiceName)
}