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agents_info.go
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/
agents_info.go
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/*
* Copyright 2018- The Pixie 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.
*
* SPDX-License-Identifier: Apache-2.0
*/
package tracker
import (
"fmt"
"sync"
"github.com/gofrs/uuid"
log "github.com/sirupsen/logrus"
"github.com/spf13/viper"
"px.dev/pixie/src/carnot/planner/distributedpb"
"px.dev/pixie/src/utils"
"px.dev/pixie/src/vizier/services/metadata/metadatapb"
)
// KelvinSSLTargetOverride the hostname used for SSL target override when sending data to Kelvin.
// Note: This value may differ in the future. When that happens, this should instead come from the
// Kelvins themselves. rather than this variable, when Kelvins send their updated state.
const KelvinSSLTargetOverride = "kelvin.%s.svc"
// AgentsInfo tracks information about the distributed state of the system.
type AgentsInfo interface {
ClearPendingState()
UpdateAgentsInfo(update *metadatapb.AgentUpdatesResponse) error
DistributedState() distributedpb.DistributedState
}
// AgentsInfoImpl implements AgentsInfo to track information about the distributed state of the system.
type AgentsInfoImpl struct {
ds distributedpb.DistributedState
// Controls access to ds.
dsMutex sync.Mutex
pendingDs *distributedpb.DistributedState
}
// NewAgentsInfo creates an empty agents info.
func NewAgentsInfo() AgentsInfo {
return &AgentsInfoImpl{
ds: distributedpb.DistributedState{},
pendingDs: &distributedpb.DistributedState{
SchemaInfo: []*distributedpb.SchemaInfo{},
CarnotInfo: []*distributedpb.CarnotInfo{},
},
}
}
// NewTestAgentsInfo creates an agents info from a passed in distributed state.
func NewTestAgentsInfo(ds *distributedpb.DistributedState) AgentsInfo {
return &AgentsInfoImpl{
ds: *(ds),
pendingDs: nil,
}
}
// ClearPendingState clears the pending agents info state (the upcoming version).
func (a *AgentsInfoImpl) ClearPendingState() {
log.Infof("Clearing distributed state")
a.pendingDs = &distributedpb.DistributedState{
SchemaInfo: []*distributedpb.SchemaInfo{},
CarnotInfo: []*distributedpb.CarnotInfo{},
}
}
// UpdateAgentsInfo creates a new agent info.
// This function must be resilient to receiving the same update twice for a given agent.
func (a *AgentsInfoImpl) UpdateAgentsInfo(update *metadatapb.AgentUpdatesResponse) error {
if update.AgentSchemasUpdated {
log.Infof("Updating schemas to %d tables", len(update.AgentSchemas))
a.pendingDs.SchemaInfo = update.AgentSchemas
}
carnotInfoMap := make(map[uuid.UUID]*distributedpb.CarnotInfo)
for _, carnotInfo := range a.pendingDs.CarnotInfo {
agentUUID, err := utils.UUIDFromProto(carnotInfo.AgentID)
if err != nil {
return err
}
carnotInfoMap[agentUUID] = carnotInfo
}
log.Tracef("%d agents present in tracker before update", len(carnotInfoMap))
createdAgents := 0
deletedAgents := 0
updatedAgents := 0
updatedAgentsDataInfo := 0
for _, agentUpdate := range update.AgentUpdates {
agentUUID, err := utils.UUIDFromProto(agentUpdate.AgentID)
if err != nil {
return err
}
// case 1: agent info update
agent := agentUpdate.GetAgent()
if agent != nil {
if _, present := carnotInfoMap[agentUUID]; present {
updatedAgents++
} else {
createdAgents++
}
if agent.Info.Capabilities == nil || agent.Info.Capabilities.CollectsData {
var metadataInfo *distributedpb.MetadataInfo
if carnotInfo, present := carnotInfoMap[agentUUID]; present {
metadataInfo = carnotInfo.MetadataInfo
}
// this is a PEM
carnotInfoMap[agentUUID] = makeAgentCarnotInfo(agentUUID, agent.ASID, metadataInfo)
} else {
// this is a Kelvin
kelvinGRPCAddress := agent.Info.IPAddress
carnotInfoMap[agentUUID] = makeKelvinCarnotInfo(agentUUID, kelvinGRPCAddress, agent.ASID)
}
}
// case 2: agent data info update
dataInfo := agentUpdate.GetDataInfo()
if dataInfo != nil {
updatedAgentsDataInfo++
carnotInfo, present := carnotInfoMap[agentUUID]
if !present {
// It's possible that an agent may be deleted, but we still receive the schema. We should be robust to this case.
continue
}
if carnotInfo == nil {
return fmt.Errorf("Carnot info is nil for agent %s, but received agent data info", agentUUID.String())
}
if dataInfo.MetadataInfo != nil {
carnotInfo.MetadataInfo = dataInfo.MetadataInfo
}
}
// case 3: agent deleted
if agentUpdate.GetDeleted() {
deletedAgents++
delete(carnotInfoMap, agentUUID)
}
}
log.Tracef("Created %d agents, deleted %d agents, updated %d agents, updated %d agents data info",
createdAgents, deletedAgents, updatedAgents, updatedAgentsDataInfo)
log.Tracef("%d agents present in tracker after update", len(carnotInfoMap))
// reset the array and recreate.
a.pendingDs.CarnotInfo = []*distributedpb.CarnotInfo{}
for _, carnotInfo := range carnotInfoMap {
a.pendingDs.CarnotInfo = append(a.pendingDs.CarnotInfo, carnotInfo)
}
// If we have reached the end of version, promote the pending DistributedState to the current external-facing
// distributed state accessible by clients of `Agents`.
if update.EndOfVersion {
a.dsMutex.Lock()
a.ds = *(a.pendingDs)
a.dsMutex.Unlock()
}
return nil
}
// DistributedState returns the current distributed state.
// Returns a non-pointer because a.ds will change over time and we want the consumer of DistributedState()
// to have a consistent result.
func (a *AgentsInfoImpl) DistributedState() distributedpb.DistributedState {
a.dsMutex.Lock()
defer a.dsMutex.Unlock()
return a.ds
}
func makeAgentCarnotInfo(agentID uuid.UUID, asid uint32, agentMetadata *distributedpb.MetadataInfo) *distributedpb.CarnotInfo {
return &distributedpb.CarnotInfo{
QueryBrokerAddress: agentID.String(),
AgentID: utils.ProtoFromUUID(agentID),
ASID: asid,
HasGRPCServer: false,
HasDataStore: true,
ProcessesData: true,
AcceptsRemoteSources: false,
MetadataInfo: agentMetadata,
}
}
func makeKelvinCarnotInfo(agentID uuid.UUID, grpcAddress string, asid uint32) *distributedpb.CarnotInfo {
return &distributedpb.CarnotInfo{
QueryBrokerAddress: agentID.String(),
AgentID: utils.ProtoFromUUID(agentID),
ASID: asid,
HasGRPCServer: true,
GRPCAddress: grpcAddress,
HasDataStore: false,
ProcessesData: true,
AcceptsRemoteSources: true,
// When we support persistent storage, Kelvins will also have MetadataInfo.
MetadataInfo: nil,
SSLTargetName: fmt.Sprintf(KelvinSSLTargetOverride, viper.GetString("pod_namespace")),
}
}