github.com/containers/podman/v2@v2.2.2-0.20210501105131-c1e07d070c4c/libpod/events/filters.go (about)

     1  package events
     2  
     3  import (
     4  	"strings"
     5  	"time"
     6  
     7  	"github.com/containers/podman/v2/pkg/util"
     8  	"github.com/pkg/errors"
     9  )
    10  
    11  func generateEventFilter(filter, filterValue string) (func(e *Event) bool, error) {
    12  	switch strings.ToUpper(filter) {
    13  	case "CONTAINER":
    14  		return func(e *Event) bool {
    15  			if e.Type != Container {
    16  				return false
    17  			}
    18  			if e.Name == filterValue {
    19  				return true
    20  			}
    21  			return strings.HasPrefix(e.ID, filterValue)
    22  		}, nil
    23  	case "EVENT", "STATUS":
    24  		return func(e *Event) bool {
    25  			return string(e.Status) == filterValue
    26  		}, nil
    27  	case "IMAGE":
    28  		return func(e *Event) bool {
    29  			if e.Type != Image {
    30  				return false
    31  			}
    32  			if e.Name == filterValue {
    33  				return true
    34  			}
    35  			return strings.HasPrefix(e.ID, filterValue)
    36  		}, nil
    37  	case "POD":
    38  		return func(e *Event) bool {
    39  			if e.Type != Pod {
    40  				return false
    41  			}
    42  			if e.Name == filterValue {
    43  				return true
    44  			}
    45  			return strings.HasPrefix(e.ID, filterValue)
    46  		}, nil
    47  	case "VOLUME":
    48  		return func(e *Event) bool {
    49  			if e.Type != Volume {
    50  				return false
    51  			}
    52  			return strings.HasPrefix(e.ID, filterValue)
    53  		}, nil
    54  	case "TYPE":
    55  		return func(e *Event) bool {
    56  			return string(e.Type) == filterValue
    57  		}, nil
    58  
    59  	case "LABEL":
    60  		return func(e *Event) bool {
    61  			var found bool
    62  			// iterate labels and see if we match a key and value
    63  			for eventKey, eventValue := range e.Attributes {
    64  				filterValueSplit := strings.SplitN(filterValue, "=", 2)
    65  				// if the filter isn't right, just return false
    66  				if len(filterValueSplit) < 2 {
    67  					return false
    68  				}
    69  				if eventKey == filterValueSplit[0] && eventValue == filterValueSplit[1] {
    70  					found = true
    71  					break
    72  				}
    73  			}
    74  			return found
    75  		}, nil
    76  	}
    77  	return nil, errors.Errorf("%s is an invalid filter", filter)
    78  }
    79  
    80  func generateEventSinceOption(timeSince time.Time) func(e *Event) bool {
    81  	return func(e *Event) bool {
    82  		return e.Time.After(timeSince)
    83  	}
    84  }
    85  
    86  func generateEventUntilOption(timeUntil time.Time) func(e *Event) bool {
    87  	return func(e *Event) bool {
    88  		return e.Time.Before(timeUntil)
    89  
    90  	}
    91  }
    92  
    93  func parseFilter(filter string) (string, string, error) {
    94  	filterSplit := strings.SplitN(filter, "=", 2)
    95  	if len(filterSplit) != 2 {
    96  		return "", "", errors.Errorf("%s is an invalid filter", filter)
    97  	}
    98  	return filterSplit[0], filterSplit[1], nil
    99  }
   100  
   101  func generateEventOptions(filters []string, since, until string) ([]EventFilter, error) {
   102  	options := make([]EventFilter, 0, len(filters))
   103  	for _, filter := range filters {
   104  		key, val, err := parseFilter(filter)
   105  		if err != nil {
   106  			return nil, err
   107  		}
   108  		funcFilter, err := generateEventFilter(key, val)
   109  		if err != nil {
   110  			return nil, err
   111  		}
   112  		options = append(options, funcFilter)
   113  	}
   114  
   115  	if len(since) > 0 {
   116  		timeSince, err := util.ParseInputTime(since)
   117  		if err != nil {
   118  			return nil, errors.Wrapf(err, "unable to convert since time of %s", since)
   119  		}
   120  		options = append(options, generateEventSinceOption(timeSince))
   121  	}
   122  
   123  	if len(until) > 0 {
   124  		timeUntil, err := util.ParseInputTime(until)
   125  		if err != nil {
   126  			return nil, errors.Wrapf(err, "unable to convert until time of %s", until)
   127  		}
   128  		options = append(options, generateEventUntilOption(timeUntil))
   129  	}
   130  	return options, nil
   131  }