util_gossip.go

// Copyright 2015 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.

package acceptance

import (
	"strings"
	"time"

	"golang.org/x/net/context"

	"github.com/cockroachdb/cockroach/pkg/acceptance/cluster"
	"github.com/cockroachdb/cockroach/pkg/gossip"
	"github.com/cockroachdb/cockroach/pkg/util"
	"github.com/cockroachdb/cockroach/pkg/util/httputil"
	"github.com/pkg/errors"
)

// CheckGossipFunc is the type of callback used in CheckGossip.
type CheckGossipFunc func(map[string]gossip.Info) error

// CheckGossip fetches the gossip infoStore from each node and invokes the given
// function. The test passes if the function returns 0 for every node,
// retrying for up to the given duration.
func CheckGossip(ctx context.Context, c cluster.Cluster, d time.Duration, f CheckGossipFunc) error {
	return errors.Wrapf(util.RetryForDuration(d, func() error {
		var infoStatus gossip.InfoStatus
		for i := 0; i < c.NumNodes(); i++ {
			if err := httputil.GetJSON(cluster.HTTPClient, c.URL(ctx, i)+"/_status/gossip/local", &infoStatus); err != nil {
				return errors.Wrapf(err, "failed to get gossip status from node %d", i)
			}
			if err := f(infoStatus.Infos); err != nil {
				return errors.Wrapf(err, "node %d", i)
			}
		}

		return nil
	}), "condition failed to evaluate within %s", d)
}

// HasPeers returns a CheckGossipFunc that passes when the given
// number of peers are connected via gossip.
func HasPeers(expected int) CheckGossipFunc {
	return func(infos map[string]gossip.Info) error {
		count := 0
		for k := range infos {
			if strings.HasPrefix(k, "node:") {
				count++
			}
		}
		if count != expected {
			return errors.Errorf("expected %d peers, found %d", expected, count)
		}
		return nil
	}
}

// hasSentinel is a checkGossipFunc that passes when the sentinel gossip is present.
func hasSentinel(infos map[string]gossip.Info) error {
	if _, ok := infos[gossip.KeySentinel]; !ok {
		return errors.Errorf("sentinel not found")
	}
	return nil
}

// hasClusterID is a checkGossipFunc that passes when the cluster ID gossip is present.
func hasClusterID(infos map[string]gossip.Info) error {
	if _, ok := infos[gossip.KeyClusterID]; !ok {
		return errors.Errorf("cluster ID not found")
	}
	return nil
}