github.com/fafucoder/cilium@v1.6.11/pkg/endpoint/restore.go (about)

     1  // Copyright 2018-2019 Authors of Cilium
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package endpoint
    16  
    17  import (
    18  	"fmt"
    19  	"io/ioutil"
    20  	"os"
    21  	"path/filepath"
    22  	"strings"
    23  
    24  	"github.com/cilium/cilium/common"
    25  	"github.com/cilium/cilium/pkg/endpoint/regeneration"
    26  	"github.com/cilium/cilium/pkg/logging/logfields"
    27  	"github.com/sirupsen/logrus"
    28  )
    29  
    30  // ReadEPsFromDirNames returns a mapping of endpoint ID to endpoint of endpoints
    31  // from a list of directory names that can possible contain an endpoint.
    32  func ReadEPsFromDirNames(owner regeneration.Owner, basePath string, eptsDirNames []string) map[uint16]*Endpoint {
    33  	completeEPDirNames, incompleteEPDirNames := partitionEPDirNamesByRestoreStatus(eptsDirNames)
    34  
    35  	if len(incompleteEPDirNames) > 0 {
    36  		for _, epDirName := range incompleteEPDirNames {
    37  			scopedLog := log.WithFields(logrus.Fields{
    38  				logfields.EndpointID: epDirName,
    39  			})
    40  			fullDirName := filepath.Join(basePath, epDirName)
    41  			scopedLog.Warning(fmt.Sprintf("Found incomplete restore directory %s. Removing it...", fullDirName))
    42  			if err := os.RemoveAll(epDirName); err != nil {
    43  				scopedLog.WithError(err).Warn(fmt.Sprintf("Error while removing directory %s. Ignoring it...", fullDirName))
    44  			}
    45  		}
    46  	}
    47  
    48  	possibleEPs := map[uint16]*Endpoint{}
    49  	for _, epDirName := range completeEPDirNames {
    50  		epDir := filepath.Join(basePath, epDirName)
    51  		readDir := func() string {
    52  			scopedLog := log.WithFields(logrus.Fields{
    53  				logfields.EndpointID: epDirName,
    54  				logfields.Path:       filepath.Join(epDir, common.CHeaderFileName),
    55  			})
    56  			scopedLog.Debug("Reading directory")
    57  			epFiles, err := ioutil.ReadDir(epDir)
    58  			if err != nil {
    59  				scopedLog.WithError(err).Warn("Error while reading directory. Ignoring it...")
    60  				return ""
    61  			}
    62  			cHeaderFile := common.FindEPConfigCHeader(epDir, epFiles)
    63  			if cHeaderFile == "" {
    64  				return ""
    65  			}
    66  			return cHeaderFile
    67  		}
    68  		// There's an odd issue where the first read dir doesn't work.
    69  		cHeaderFile := readDir()
    70  		if cHeaderFile == "" {
    71  			cHeaderFile = readDir()
    72  		}
    73  
    74  		scopedLog := log.WithFields(logrus.Fields{
    75  			logfields.EndpointID: epDirName,
    76  			logfields.Path:       cHeaderFile,
    77  		})
    78  
    79  		if cHeaderFile == "" {
    80  			scopedLog.Warning("C header file not found. Ignoring endpoint")
    81  			continue
    82  		}
    83  
    84  		scopedLog.Debug("Found endpoint C header file")
    85  
    86  		strEp, err := common.GetCiliumVersionString(cHeaderFile)
    87  		if err != nil {
    88  			scopedLog.WithError(err).Warn("Unable to read the C header file")
    89  			continue
    90  		}
    91  		ep, err := ParseEndpoint(owner, strEp)
    92  		if err != nil {
    93  			scopedLog.WithError(err).Warn("Unable to parse the C header file")
    94  			continue
    95  		}
    96  		if _, ok := possibleEPs[ep.ID]; ok {
    97  			// If the endpoint already exists then give priority to the directory
    98  			// that contains an endpoint that didn't fail to be build.
    99  			if strings.HasSuffix(ep.DirectoryPath(), epDirName) {
   100  				possibleEPs[ep.ID] = ep
   101  			}
   102  		} else {
   103  			possibleEPs[ep.ID] = ep
   104  		}
   105  	}
   106  	return possibleEPs
   107  }
   108  
   109  // partitionEPDirNamesByRestoreStatus partitions the provided list of directory
   110  // names that can possibly contain an endpoint, into two lists, containing those
   111  // names that represent an incomplete endpoint restore and those that do not.
   112  func partitionEPDirNamesByRestoreStatus(eptsDirNames []string) (complete []string, incomplete []string) {
   113  	dirNames := make(map[string]struct{})
   114  	for _, epDirName := range eptsDirNames {
   115  		dirNames[epDirName] = struct{}{}
   116  	}
   117  
   118  	incompleteSuffixes := []string{nextDirectorySuffix, nextFailedDirectorySuffix}
   119  	incompleteSet := make(map[string]struct{})
   120  
   121  	for _, epDirName := range eptsDirNames {
   122  		for _, suff := range incompleteSuffixes {
   123  			if strings.HasSuffix(epDirName, suff) {
   124  				if _, exists := dirNames[epDirName[:len(epDirName)-len(suff)]]; exists {
   125  					incompleteSet[epDirName] = struct{}{}
   126  				}
   127  			}
   128  		}
   129  	}
   130  
   131  	for epDirName := range dirNames {
   132  		if _, exists := incompleteSet[epDirName]; exists {
   133  			incomplete = append(incomplete, epDirName)
   134  		} else {
   135  			complete = append(complete, epDirName)
   136  		}
   137  	}
   138  
   139  	return
   140  }