/
processor.go
345 lines (283 loc) · 9.81 KB
/
processor.go
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package linuxmonitor
import (
"errors"
"fmt"
"io/ioutil"
"regexp"
"strconv"
"strings"
"go.uber.org/zap"
"github.com/aporeto-inc/trireme/collector"
"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/monitor/rpcmonitor"
"github.com/aporeto-inc/trireme/policy"
)
// LinuxProcessor captures all the monitor processor information
// It implements the MonitorProcessor interface of the rpc monitor
type LinuxProcessor struct {
collector collector.EventCollector
puHandler monitor.ProcessingUnitsHandler
metadataExtractor rpcmonitor.RPCMetadataExtractor
netcls cgnetcls.Cgroupnetcls
contextStore contextstore.ContextStore
regStart *regexp.Regexp
regStop *regexp.Regexp
storePath string
}
// NewCustomLinuxProcessor initializes a processor with a custom path
func NewCustomLinuxProcessor(storePath string, collector collector.EventCollector, puHandler monitor.ProcessingUnitsHandler, metadataExtractor rpcmonitor.RPCMetadataExtractor, releasePath string) *LinuxProcessor {
return &LinuxProcessor{
collector: collector,
puHandler: puHandler,
metadataExtractor: metadataExtractor,
netcls: cgnetcls.NewCgroupNetController(releasePath),
contextStore: contextstore.NewContextStore(storePath),
storePath: storePath,
regStart: regexp.MustCompile("^[a-zA-Z0-9_].{0,11}$"),
regStop: regexp.MustCompile("^/trireme/[a-zA-Z0-9_].{0,11}$"),
}
}
// NewLinuxProcessor creates a default Linux processor with the standard trireme path
func NewLinuxProcessor(collector collector.EventCollector, puHandler monitor.ProcessingUnitsHandler, metadataExtractor rpcmonitor.RPCMetadataExtractor, releasePath string) *LinuxProcessor {
return NewCustomLinuxProcessor("/var/run/trireme/linux", collector, puHandler, metadataExtractor, releasePath)
}
// Create handles create events
func (s *LinuxProcessor) Create(eventInfo *rpcmonitor.EventInfo) error {
if !s.regStart.Match([]byte(eventInfo.PUID)) {
return fmt.Errorf("Invalid PU ID %s", eventInfo.PUID)
}
return s.puHandler.HandlePUEvent(eventInfo.PUID, monitor.EventCreate)
}
// Start handles start events
func (s *LinuxProcessor) Start(eventInfo *rpcmonitor.EventInfo) error {
// Validate the PUID format
if !s.regStart.Match([]byte(eventInfo.PUID)) {
return fmt.Errorf("Invalid PU ID %s", eventInfo.PUID)
}
contextID := eventInfo.PUID
// Extract the metadata
runtimeInfo, err := s.metadataExtractor(eventInfo)
if err != nil {
return err
}
// Setup the run time
if err = s.puHandler.SetPURuntime(contextID, runtimeInfo); err != nil {
return err
}
defaultIP, _ := runtimeInfo.DefaultIPAddress()
if perr := s.puHandler.HandlePUEvent(contextID, monitor.EventStart); perr != nil {
zap.L().Error("Failed to activate process", zap.Error(perr))
return perr
}
if eventInfo.HostService {
err = s.processHostServiceStart(eventInfo, runtimeInfo)
} else {
err = s.processLinuxServiceStart(eventInfo, runtimeInfo)
}
if err != nil {
return err
}
s.collector.CollectContainerEvent(&collector.ContainerRecord{
ContextID: contextID,
IPAddress: defaultIP,
Tags: runtimeInfo.Tags(),
Event: collector.ContainerStart,
})
// Store the state in the context store for future access
return s.contextStore.StoreContext(contextID, eventInfo)
}
// Stop handles a stop event
func (s *LinuxProcessor) Stop(eventInfo *rpcmonitor.EventInfo) error {
contextID, err := s.generateContextID(eventInfo)
if err != nil {
return err
}
if contextID == "/trireme" {
return nil
}
contextID = contextID[strings.LastIndex(contextID, "/")+1:]
return s.puHandler.HandlePUEvent(contextID, monitor.EventStop)
}
// Destroy handles a destroy event
func (s *LinuxProcessor) Destroy(eventInfo *rpcmonitor.EventInfo) error {
contextID, err := s.generateContextID(eventInfo)
if err != nil {
return err
}
if contextID == "/trireme" {
contextID = strings.TrimLeft(contextID, "/")
s.netcls.Deletebasepath(contextID)
return nil
}
contextID = contextID[strings.LastIndex(contextID, "/")+1:]
// Send the event upstream
if err := s.puHandler.HandlePUEvent(contextID, monitor.EventDestroy); err != nil {
zap.L().Warn("Failed to clean trireme ",
zap.String("contextID", contextID),
zap.Error(err),
)
}
if eventInfo.HostService {
if err := ioutil.WriteFile("/sys/fs/cgroup/net_cls,net_prio/net_cls.classid", []byte("0"), 0644); err != nil {
return fmt.Errorf("Failed to write to net_cls.classid file for new cgroup, error %s", err.Error())
}
}
//let us remove the cgroup files now
if err := s.netcls.DeleteCgroup(contextID); err != nil {
zap.L().Warn("Failed to clean netcls group",
zap.String("contextID", contextID),
zap.Error(err),
)
}
if err := s.contextStore.RemoveContext(contextID); err != nil {
zap.L().Error("Failed to clean cache while destroying process",
zap.String("contextID", contextID),
zap.Error(err),
)
}
return nil
}
// Pause handles a pause event
func (s *LinuxProcessor) Pause(eventInfo *rpcmonitor.EventInfo) error {
contextID, err := s.generateContextID(eventInfo)
if err != nil {
return fmt.Errorf("Couldn't generate a contextID: %s", err)
}
return s.puHandler.HandlePUEvent(contextID, monitor.EventPause)
}
// ReSync resyncs with all the existing services that were there before we start
func (s *LinuxProcessor) ReSync(e *rpcmonitor.EventInfo) error {
deleted := []string{}
reacquired := []string{}
defer func() {
if len(deleted) > 0 {
zap.L().Info("Deleted dead contexts", zap.String("Context List", strings.Join(deleted, ",")))
}
if len(reacquired) > 0 {
zap.L().Info("Reacquired contexts", zap.String("Context List", strings.Join(reacquired, ",")))
}
}()
walker, err := s.contextStore.WalkStore()
if err != nil {
return fmt.Errorf("error in accessing context store")
}
for {
contextID := <-walker
if contextID == "" {
break
}
eventInfo := rpcmonitor.EventInfo{}
if err := s.contextStore.GetContextInfo("/"+contextID, &eventInfo); err != nil {
continue
}
if !eventInfo.HostService {
processlist, err := cgnetcls.ListCgroupProcesses(eventInfo.PUID)
if err != nil {
zap.L().Debug("Removing Context for empty cgroup", zap.String("CONTEXTID", eventInfo.PUID))
deleted = append(deleted, eventInfo.PUID)
// The cgroup does not exists - log error and remove context
if cerr := s.contextStore.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 := s.netcls.DeleteCgroup(eventInfo.PUID); err != nil {
zap.L().Warn("Failed to deleted cgroup",
zap.String("puID", eventInfo.PUID),
zap.Error(err),
)
}
deleted = append(deleted, eventInfo.PUID)
if err := s.contextStore.RemoveContext(eventInfo.PUID); err != nil {
zap.L().Warn("Failed to deleted context",
zap.String("puID", eventInfo.PUID),
zap.Error(err),
)
}
continue
}
}
reacquired = append(reacquired, eventInfo.PUID)
if err := s.Start(&eventInfo); err != nil {
zap.L().Error("Failed to start PU ", zap.String("PUID", eventInfo.PUID))
return fmt.Errorf("error in processing existing data: %s", err.Error())
}
}
return nil
}
// generateContextID creates the contextID from the event information
func (s *LinuxProcessor) generateContextID(eventInfo *rpcmonitor.EventInfo) (string, error) {
contextID := eventInfo.PUID
if eventInfo.Cgroup != "" {
if !s.regStop.Match([]byte(eventInfo.Cgroup)) {
return "", fmt.Errorf("Invalid PUID %s", eventInfo.Cgroup)
}
contextID = eventInfo.Cgroup[strings.LastIndex(eventInfo.Cgroup, "/")+1:]
}
//contextID = contextID[strings.LastIndex(eventInfo.Cgroup, "/")+1:]
return contextID, nil
}
func (s *LinuxProcessor) processLinuxServiceStart(event *rpcmonitor.EventInfo, runtimeInfo *policy.PURuntime) error {
list, err := cgnetcls.ListCgroupProcesses(event.PUID)
if err == nil {
//cgroup exists and pid might be a member
isrestart := func() bool {
for _, element := range list {
if element == event.PID {
//pid is already there it is restart
return true
}
}
return false
}()
if !isrestart {
pid, _ := strconv.Atoi(event.PID)
s.netcls.AddProcess(event.PUID, pid) // nolint
return nil
}
}
//It is okay to launch this so let us create a cgroup for it
err = s.netcls.Creategroup(event.PUID)
if err != nil {
return err
}
markval := runtimeInfo.Options().CgroupMark
if markval == "" {
if derr := s.netcls.DeleteCgroup(event.PUID); derr != nil {
zap.L().Warn("Failed to clean cgroup", zap.Error(derr))
}
return errors.New("Mark value not found")
}
mark, _ := strconv.ParseUint(markval, 10, 32)
err = s.netcls.AssignMark(event.PUID, mark)
if err != nil {
if derr := s.netcls.DeleteCgroup(event.PUID); derr != nil {
zap.L().Warn("Failed to clean cgroup", zap.Error(derr))
}
return err
}
pid, _ := strconv.Atoi(event.PID)
err = s.netcls.AddProcess(event.PUID, pid)
if err != nil {
if derr := s.netcls.DeleteCgroup(event.PUID); derr != nil {
zap.L().Warn("Failed to clean cgroup", zap.Error(derr))
}
return err
}
return nil
}
func (s *LinuxProcessor) processHostServiceStart(event *rpcmonitor.EventInfo, runtimeInfo *policy.PURuntime) error {
if !event.NetworkOnlyTraffic {
markval := runtimeInfo.Options().CgroupMark
mark, _ := strconv.ParseUint(markval, 10, 32)
hexmark := "0x" + (strconv.FormatUint(mark, 16))
if err := ioutil.WriteFile("/sys/fs/cgroup/net_cls,net_prio/net_cls.classid", []byte(hexmark), 0644); err != nil {
return errors.New("Failed to write to net_cls.classid file for new cgroup")
}
}
return nil
}