/
rpc.go
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/
rpc.go
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package rpcmonitor
import (
"encoding/json"
"fmt"
"net"
"net/rpc"
"net/rpc/jsonrpc"
"os"
"strconv"
"strings"
"go.uber.org/zap"
"github.com/aporeto-inc/trireme/collector"
"github.com/aporeto-inc/trireme/constants"
"github.com/aporeto-inc/trireme/monitor"
"github.com/aporeto-inc/trireme/monitor/contextstore"
"github.com/aporeto-inc/trireme/monitor/linuxmonitor/cgnetcls"
"github.com/aporeto-inc/trireme/policy"
)
var contextStorePath = "/var/run/trireme"
// RPCMetadataExtractor is a function used to extract a *policy.PURuntime from a given
// EventInfo.
type RPCMetadataExtractor func(*EventInfo) (*policy.PURuntime, error)
// A RPCEventHandler is type of docker event handler functions.
type RPCEventHandler func(*EventInfo) error
// RPCMonitor implements the RPC connection
type RPCMonitor struct {
rpcAddress string
rpcServer *rpc.Server
monitorServer *Server
listensock net.Listener
contextstore contextstore.ContextStore
collector collector.EventCollector
}
// Server represents the Monitor RPC Server implementation
type Server struct {
handlers map[constants.PUType]map[monitor.Event]RPCEventHandler
}
// NewRPCMonitor returns a base RPC monitor. Processors must be registered externally
func NewRPCMonitor(rpcAddress string, collector collector.EventCollector) (*RPCMonitor, error) {
if rpcAddress == "" {
return nil, fmt.Errorf("RPC endpoint address invalid")
}
if _, err := os.Stat(rpcAddress); err == nil {
if err := os.Remove(rpcAddress); err != nil {
return nil, fmt.Errorf("Failed to clean up rpc socket")
}
}
monitorServer := &Server{
handlers: map[constants.PUType]map[monitor.Event]RPCEventHandler{},
}
r := &RPCMonitor{
rpcAddress: rpcAddress,
monitorServer: monitorServer,
contextstore: contextstore.NewContextStore(contextStorePath),
collector: collector,
}
// Registering the monitorRPCServer as an RPC Server.
r.rpcServer = rpc.NewServer()
err := r.rpcServer.Register(r.monitorServer)
if err != nil {
zap.L().Fatal("Format of service MonitorServer isn't correct", zap.Error(err))
}
return r, nil
}
// RegisterProcessor registers an event processor for a given PUTYpe. Only one
// processor is allowed for a given PU Type.
func (r *RPCMonitor) RegisterProcessor(puType constants.PUType, processor MonitorProcessor) error {
if _, ok := r.monitorServer.handlers[puType]; ok {
return fmt.Errorf("Processor already registered for this PU type %d ", puType)
}
r.monitorServer.handlers[puType] = map[monitor.Event]RPCEventHandler{}
r.monitorServer.addHandler(puType, monitor.EventStart, processor.Start)
r.monitorServer.addHandler(puType, monitor.EventStop, processor.Stop)
r.monitorServer.addHandler(puType, monitor.EventCreate, processor.Create)
r.monitorServer.addHandler(puType, monitor.EventDestroy, processor.Destroy)
r.monitorServer.addHandler(puType, monitor.EventPause, processor.Pause)
return nil
}
// reSync resyncs with all the existing services that were there before we start
func (r *RPCMonitor) reSync() error {
walker, err := r.contextstore.WalkStore()
if err != nil {
return fmt.Errorf("error in accessing context store")
}
//This is create to only delete if required don't create groups using this handle here
cgnetclshandle := cgnetcls.NewCgroupNetController("")
cstorehandle := contextstore.NewContextStore(contextStorePath)
for {
contextID := <-walker
if contextID == "" {
break
}
data, cerr := r.contextstore.GetContextInfo("/" + contextID)
if cerr != nil || data == nil {
continue
}
var eventInfo EventInfo
if err := json.Unmarshal(data.([]byte), &eventInfo); err != nil {
zap.L().Warn("Found invalid state for context - Cleaning up",
zap.String("contextID", contextID),
zap.Error(err),
)
if rerr := r.contextstore.RemoveContext("/" + contextID); rerr != nil {
return fmt.Errorf("Failed to remove invalide context for %s", rerr.Error())
}
continue
}
processlist, err := cgnetcls.ListCgroupProcesses(eventInfo.PUID)
if err != nil {
//The cgroup does not exists - log error and remove context
if cerr := cstorehandle.RemoveContext(eventInfo.PUID); cerr != nil {
zap.L().Warn("Failed to remove state from store handler", zap.Error(cerr))
}
continue
}
if len(processlist) <= 0 {
//We have an empty cgroup
//Remove the cgroup and context store file
if err := cgnetclshandle.DeleteCgroup(eventInfo.PUID); err != nil {
zap.L().Warn("Failed to deleted cgroup",
zap.String("puID", eventInfo.PUID),
zap.Error(err),
)
}
if err := cstorehandle.RemoveContext(eventInfo.PUID); err != nil {
zap.L().Warn("Failed to deleted context",
zap.String("puID", eventInfo.PUID),
zap.Error(err),
)
}
continue
}
if f, ok := r.monitorServer.handlers[eventInfo.PUType][monitor.EventStart]; ok {
if err := f(&eventInfo); err != nil {
return fmt.Errorf("error in processing existing data: %s", err.Error())
}
} else {
return fmt.Errorf("cannot find handler")
}
}
return nil
}
// processRequests processes the RPC requests
func (r *RPCMonitor) processRequests() {
for {
conn, err := r.listensock.Accept()
if err != nil {
if !strings.Contains(err.Error(), "closed") {
zap.L().Error("Error while handling RPC event", zap.Error(err))
}
break
}
r.rpcServer.ServeCodec(jsonrpc.NewServerCodec(conn))
}
}
// Start starts the RPC monitoring.
func (r *RPCMonitor) Start() error {
var err error
zap.L().Debug("Starting RPC monitor", zap.String("address", r.rpcAddress))
// Check if we had running units when we last died
if err = r.reSync(); err != nil {
return err
}
if r.listensock, err = net.Listen("unix", r.rpcAddress); err != nil {
return fmt.Errorf("Failed to start RPC monitor: couldn't create binding: %s", err.Error())
}
if err = os.Chmod(r.rpcAddress, 0766); err != nil {
return fmt.Errorf("Failed to start RPC monitor: cannot adjust permissions %s", err.Error())
}
//Launch a go func to accept connections
go r.processRequests()
return nil
}
// Stop monitoring RPC events.
func (r *RPCMonitor) Stop() error {
if err := r.listensock.Close(); err != nil {
zap.L().Warn("Failed to stop rpc monitor", zap.Error(err))
}
if err := os.RemoveAll(r.rpcAddress); err != nil {
zap.L().Warn("Failed to cleanup rpc monitor socket", zap.Error(err))
}
return nil
}
func (s *Server) addHandler(puType constants.PUType, event monitor.Event, handler RPCEventHandler) {
s.handlers[puType][event] = handler
}
// HandleEvent Gets called when clients generate events.
func (s *Server) HandleEvent(eventInfo *EventInfo, result *RPCResponse) error {
if eventInfo.EventType == "" {
return fmt.Errorf("Invalid event type")
}
if _, ok := s.handlers[eventInfo.PUType]; ok {
f, present := s.handlers[eventInfo.PUType][eventInfo.EventType]
if present {
if err := f(eventInfo); err != nil {
result.Error = err.Error()
return err
}
return nil
}
}
err := fmt.Errorf("No handler found for the event")
result.Error = err.Error()
return err
}
// DefaultRPCMetadataExtractor is a default RPC metadata extractor for testing
func DefaultRPCMetadataExtractor(event *EventInfo) (*policy.PURuntime, error) {
if event.Name == "" {
return nil, fmt.Errorf("EventInfo PU Name is empty")
}
if event.PID == "" {
return nil, fmt.Errorf("EventInfo PID is empty")
}
if event.PUID == "" {
return nil, fmt.Errorf("EventInfo PUID is empty")
}
runtimeTags := policy.NewTagStoreFromMap(event.Tags)
runtimeIps := event.IPs
runtimePID, err := strconv.Atoi(event.PID)
if err != nil {
return nil, fmt.Errorf("PID is invalid: %s", err)
}
return policy.NewPURuntime(event.Name, runtimePID, "", runtimeTags, runtimeIps, constants.ContainerPU, nil), nil
}