open-consul/testrpc/wait.go

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package testrpc
import (
"testing"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/sdk/testutil/retry"
)
type rpcFn func(string, interface{}, interface{}) error
// WaitForLeader ensures we have a leader and a node registration.
func WaitForLeader(t *testing.T, rpc rpcFn, dc string) {
var out structs.IndexedNodes
retry.Run(t, func(r *retry.R) {
args := &structs.DCSpecificRequest{Datacenter: dc}
if err := rpc("Catalog.ListNodes", args, &out); err != nil {
r.Fatalf("Catalog.ListNodes failed: %v", err)
}
if !out.QueryMeta.KnownLeader {
r.Fatalf("No leader")
}
if out.Index < 2 {
r.Fatalf("Consul index should be at least 2")
}
})
}
// WaitUntilNoLeader ensures no leader is present, useful for testing lost leadership.
func WaitUntilNoLeader(t *testing.T, rpc rpcFn, dc string) {
var out structs.IndexedNodes
retry.Run(t, func(r *retry.R) {
args := &structs.DCSpecificRequest{Datacenter: dc}
if err := rpc("Catalog.ListNodes", args, &out); err == nil {
r.Fatalf("It still has a leader: %#v", out)
}
if out.QueryMeta.KnownLeader {
r.Fatalf("Has still a leader")
}
})
}
type waitOption struct {
Token string
}
func WithToken(token string) waitOption {
return waitOption{Token: token}
}
// WaitForTestAgent ensures we have a node with serfHealth check registered
func WaitForTestAgent(t *testing.T, rpc rpcFn, dc string, options ...waitOption) {
var nodes structs.IndexedNodes
var checks structs.IndexedHealthChecks
// first extra arg is an optional acl token
var token string
for _, opt := range options {
if opt.Token != "" {
token = opt.Token
}
}
retry.Run(t, func(r *retry.R) {
dcReq := &structs.DCSpecificRequest{
Datacenter: dc,
QueryOptions: structs.QueryOptions{Token: token},
}
if err := rpc("Catalog.ListNodes", dcReq, &nodes); err != nil {
r.Fatalf("Catalog.ListNodes failed: %v", err)
}
if len(nodes.Nodes) == 0 {
r.Fatalf("No registered nodes")
}
// This assumes that there is a single agent per dc, typically a TestAgent
nodeReq := &structs.NodeSpecificRequest{
Datacenter: dc,
Node: nodes.Nodes[0].Node,
QueryOptions: structs.QueryOptions{Token: token},
}
if err := rpc("Health.NodeChecks", nodeReq, &checks); err != nil {
r.Fatalf("Health.NodeChecks failed: %v", err)
}
var found bool
for _, check := range checks.HealthChecks {
if check.CheckID == "serfHealth" {
found = true
break
}
}
if !found {
r.Fatalf("serfHealth check not found")
}
})
}