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members.go
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/
members.go
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//
// DISCLAIMER
//
// Copyright 2018 ArangoDB GmbH, Cologne, Germany
//
// 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.
//
// Copyright holder is ArangoDB GmbH, Cologne, Germany
//
// Author Ewout Prangsma
//
package deployment
import (
"fmt"
"strings"
"github.com/dchest/uniuri"
"github.com/rs/zerolog"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
api "github.com/arangodb/kube-arangodb/pkg/apis/deployment/v1alpha"
"github.com/arangodb/kube-arangodb/pkg/util/k8sutil"
)
// createInitialMembers creates all members needed for the initial state of the deployment.
// Note: This does not create any pods of PVCs
func (d *Deployment) createInitialMembers(apiObject *api.ArangoDeployment) error {
log := d.deps.Log
log.Debug().Msg("creating initial members...")
// Go over all groups and create members
var events []*k8sutil.Event
status, lastVersion := d.GetStatus()
if err := apiObject.ForeachServerGroup(func(group api.ServerGroup, spec api.ServerGroupSpec, members *api.MemberStatusList) error {
for len(*members) < spec.GetCount() {
id, err := createMember(log, &status, group, "", apiObject)
if err != nil {
return maskAny(err)
}
events = append(events, k8sutil.NewMemberAddEvent(id, group.AsRole(), apiObject))
}
return nil
}, &status); err != nil {
return maskAny(err)
}
// Save status
log.Debug().Msg("saving initial members...")
if err := d.UpdateStatus(status, lastVersion); err != nil {
return maskAny(err)
}
// Save events
for _, evt := range events {
d.CreateEvent(evt)
}
return nil
}
// createMember creates member and adds it to the applicable member list.
// Note: This does not create any pods of PVCs
// Note: The updated status is not yet written to the apiserver.
func createMember(log zerolog.Logger, status *api.DeploymentStatus, group api.ServerGroup, id string, apiObject *api.ArangoDeployment) (string, error) {
if id == "" {
idPrefix := getArangodIDPrefix(group)
for {
id = idPrefix + strings.ToLower(uniuri.NewLen(8)) // K8s accepts only lowercase, so we use it here as well
if !status.Members.ContainsID(id) {
break
}
// Duplicate, try again
}
}
deploymentName := apiObject.GetName()
role := group.AsRole()
switch group {
case api.ServerGroupSingle:
log.Debug().Str("id", id).Msg("Adding single server")
if err := status.Members.Add(api.MemberStatus{
ID: id,
CreatedAt: metav1.Now(),
Phase: api.MemberPhaseNone,
PersistentVolumeClaimName: k8sutil.CreatePersistentVolumeClaimName(deploymentName, role, id),
PodName: "",
}, group); err != nil {
return "", maskAny(err)
}
case api.ServerGroupAgents:
log.Debug().Str("id", id).Msg("Adding agent")
if err := status.Members.Add(api.MemberStatus{
ID: id,
CreatedAt: metav1.Now(),
Phase: api.MemberPhaseNone,
PersistentVolumeClaimName: k8sutil.CreatePersistentVolumeClaimName(deploymentName, role, id),
PodName: "",
}, group); err != nil {
return "", maskAny(err)
}
case api.ServerGroupDBServers:
log.Debug().Str("id", id).Msg("Adding dbserver")
if err := status.Members.Add(api.MemberStatus{
ID: id,
CreatedAt: metav1.Now(),
Phase: api.MemberPhaseNone,
PersistentVolumeClaimName: k8sutil.CreatePersistentVolumeClaimName(deploymentName, role, id),
PodName: "",
}, group); err != nil {
return "", maskAny(err)
}
case api.ServerGroupCoordinators:
log.Debug().Str("id", id).Msg("Adding coordinator")
if err := status.Members.Add(api.MemberStatus{
ID: id,
CreatedAt: metav1.Now(),
Phase: api.MemberPhaseNone,
PersistentVolumeClaimName: "",
PodName: "",
}, group); err != nil {
return "", maskAny(err)
}
case api.ServerGroupSyncMasters:
log.Debug().Str("id", id).Msg("Adding syncmaster")
if err := status.Members.Add(api.MemberStatus{
ID: id,
CreatedAt: metav1.Now(),
Phase: api.MemberPhaseNone,
PersistentVolumeClaimName: "",
PodName: "",
}, group); err != nil {
return "", maskAny(err)
}
case api.ServerGroupSyncWorkers:
log.Debug().Str("id", id).Msg("Adding syncworker")
if err := status.Members.Add(api.MemberStatus{
ID: id,
CreatedAt: metav1.Now(),
Phase: api.MemberPhaseNone,
PersistentVolumeClaimName: "",
PodName: "",
}, group); err != nil {
return "", maskAny(err)
}
default:
return "", maskAny(fmt.Errorf("Unknown server group %d", group))
}
return id, nil
}
// getArangodIDPrefix returns the prefix required ID's of arangod servers
// in the given group.
func getArangodIDPrefix(group api.ServerGroup) string {
switch group {
case api.ServerGroupSingle:
return "SNGL-"
case api.ServerGroupCoordinators:
return "CRDN-"
case api.ServerGroupDBServers:
return "PRMR-"
case api.ServerGroupAgents:
return "AGNT-"
default:
return ""
}
}