open-consul/agent/consul/stats_fetcher_test.go

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package consul
import (
"context"
"os"
"testing"
"time"
"github.com/hashicorp/consul/agent/metadata"
"github.com/hashicorp/consul/testrpc"
"github.com/hashicorp/consul/types"
)
func TestStatsFetcher(t *testing.T) {
t.Parallel()
dir1, s1 := testServerDCExpect(t, "dc1", 3)
defer os.RemoveAll(dir1)
defer s1.Shutdown()
dir2, s2 := testServerDCExpect(t, "dc1", 3)
defer os.RemoveAll(dir2)
defer s2.Shutdown()
dir3, s3 := testServerDCExpect(t, "dc1", 3)
defer os.RemoveAll(dir3)
defer s3.Shutdown()
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joinLAN(t, s2, s1)
joinLAN(t, s3, s1)
testrpc.WaitForLeader(t, s1.RPC, "dc1")
members := s1.serfLAN.Members()
if len(members) != 3 {
t.Fatalf("bad len: %d", len(members))
}
var servers []*metadata.Server
for _, member := range members {
ok, server := metadata.IsConsulServer(member)
if !ok {
t.Fatalf("bad: %#v", member)
}
servers = append(servers, server)
}
// Do a normal fetch and make sure we get three responses.
func() {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
stats := s1.statsFetcher.Fetch(ctx, s1.LANMembers())
if len(stats) != 3 {
t.Fatalf("bad: %#v", stats)
}
for id, stat := range stats {
switch types.NodeID(id) {
case s1.config.NodeID, s2.config.NodeID, s3.config.NodeID:
// OK
default:
t.Fatalf("bad: %s", id)
}
if stat == nil || stat.LastTerm == 0 {
t.Fatalf("bad: %#v", stat)
}
}
}()
// Fake an in-flight request to server 3 and make sure we don't fetch
// from it.
func() {
s1.statsFetcher.inflight[string(s3.config.NodeID)] = struct{}{}
defer delete(s1.statsFetcher.inflight, string(s3.config.NodeID))
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
stats := s1.statsFetcher.Fetch(ctx, s1.LANMembers())
if len(stats) != 2 {
t.Fatalf("bad: %#v", stats)
}
for id, stat := range stats {
switch types.NodeID(id) {
case s1.config.NodeID, s2.config.NodeID:
// OK
case s3.config.NodeID:
t.Fatalf("bad")
default:
t.Fatalf("bad: %s", id)
}
if stat == nil || stat.LastTerm == 0 {
t.Fatalf("bad: %#v", stat)
}
}
}()
}