Merge pull request #10514 from vrothberg/fix-10507

events: support disjunctive filters

libpod/events/filters.go

@@ -97,18 +97,41 @@ func parseFilter(filter string) (string, string, error) {
 	return filterSplit[0], filterSplit[1], nil
 }
 
-func generateEventOptions(filters []string, since, until string) ([]EventFilter, error) {
-	options := make([]EventFilter, 0, len(filters))
+// applyFilters applies the EventFilter slices in sequence.  Filters under the
+// same key are disjunctive while each key must match (conjuctive).
+func applyFilters(event *Event, filterMap map[string][]EventFilter) bool {
+	for _, filters := range filterMap {
+		success := false
+		for _, filter := range filters {
+			if filter(event) {
+				success = true
+				break
+			}
+		}
+		if !success {
+			return false
+		}
+	}
+	return true
+}
+
+// generateEventFilter parses the specified filters into a filter map that can
+// later on be used to filter events.  Keys are conjunctive, values are
+// disjunctive.
+func generateEventFilters(filters []string, since, until string) (map[string][]EventFilter, error) {
+	filterMap := make(map[string][]EventFilter)
 	for _, filter := range filters {
 		key, val, err := parseFilter(filter)
 		if err != nil {
 			return nil, err
 		}
-		funcFilter, err := generateEventFilter(key, val)
+		filterFunc, err := generateEventFilter(key, val)
 		if err != nil {
 			return nil, err
 		}
-		options = append(options, funcFilter)
+		filterSlice := filterMap[key]
+		filterSlice = append(filterSlice, filterFunc)
+		filterMap[key] = filterSlice
 	}
 
 	if len(since) > 0 {
@@ -116,7 +139,8 @@ func generateEventOptions(filters []string, since, until string) ([]EventFilter,
 		if err != nil {
 			return nil, errors.Wrapf(err, "unable to convert since time of %s", since)
 		}
-		options = append(options, generateEventSinceOption(timeSince))
+		filterFunc := generateEventSinceOption(timeSince)
+		filterMap["since"] = []EventFilter{filterFunc}
 	}
 
 	if len(until) > 0 {
@@ -124,7 +148,8 @@ func generateEventOptions(filters []string, since, until string) ([]EventFilter,
 		if err != nil {
 			return nil, errors.Wrapf(err, "unable to convert until time of %s", until)
 		}
-		options = append(options, generateEventUntilOption(timeUntil))
+		filterFunc := generateEventUntilOption(timeUntil)
+		filterMap["until"] = []EventFilter{filterFunc}
 	}
-	return options, nil
+	return filterMap, nil
 }

libpod/events/journal_linux.go

@@ -69,9 +69,9 @@ func (e EventJournalD) Write(ee Event) error {
 // Read reads events from the journal and sends qualified events to the event channel
 func (e EventJournalD) Read(ctx context.Context, options ReadOptions) error {
 	defer close(options.EventChannel)
-	eventOptions, err := generateEventOptions(options.Filters, options.Since, options.Until)
+	filterMap, err := generateEventFilters(options.Filters, options.Since, options.Until)
 	if err != nil {
-		return errors.Wrapf(err, "failed to generate event options")
+		return errors.Wrapf(err, "failed to parse event filters")
 	}
 	var untilTime time.Time
 	if len(options.Until) > 0 {
@@ -159,11 +159,7 @@ func (e EventJournalD) Read(ctx context.Context, options ReadOptions) error {
 			}
 			continue
 		}
-		include := true
-		for _, filter := range eventOptions {
-			include = include && filter(newEvent)
-		}
-		if include {
+		if applyFilters(newEvent, filterMap) {
 			options.EventChannel <- newEvent
 		}
 	}

libpod/events/logfile.go

@@ -44,9 +44,9 @@ func (e EventLogFile) Write(ee Event) error {
 // Reads from the log file
 func (e EventLogFile) Read(ctx context.Context, options ReadOptions) error {
 	defer close(options.EventChannel)
-	eventOptions, err := generateEventOptions(options.Filters, options.Since, options.Until)
+	filterMap, err := generateEventFilters(options.Filters, options.Since, options.Until)
 	if err != nil {
-		return errors.Wrapf(err, "unable to generate event options")
+		return errors.Wrapf(err, "failed to parse event filters")
 	}
 	t, err := e.getTail(options)
 	if err != nil {
@@ -92,11 +92,7 @@ func (e EventLogFile) Read(ctx context.Context, options ReadOptions) error {
 		default:
 			return errors.Errorf("event type %s is not valid in %s", event.Type.String(), e.options.LogFilePath)
 		}
-		include := true
-		for _, filter := range eventOptions {
-			include = include && filter(event)
-		}
-		if include && copy {
+		if copy && applyFilters(event, filterMap) {
 			options.EventChannel <- event
 		}
 	}

test/system/090-events.bats

@@ -61,3 +61,32 @@ load helpers
 .*image remove $imageID $tag.*" \
        "podman events"
 }
+
+function _events_disjunctive_filters() {
+    local backend=$1
+
+    # Regression test for #10507: make sure that filters with the same key are
+    # applied in disjunction.
+    t0=$(date --iso-8601=seconds)
+    run_podman $backend run --name foo --rm $IMAGE ls
+    run_podman $backend run --name bar --rm $IMAGE ls
+    run_podman $backend events --stream=false --since=$t0 --filter container=foo --filter container=bar --filter event=start
+    is "$output" ".* container start .* name=foo.*
+.* container start .* name=bar.*"
+}
+
+@test "events with disjunctive filters - file" {
+    skip_if_remote "remote does not support --events-backend"
+    _events_disjunctive_filters --events-backend=file
+}
+
+@test "events with disjunctive filters - journald" {
+    skip_if_remote "remote does not support --events-backend"
+    _events_disjunctive_filters --events-backend=journald
+}
+
+@test "events with disjunctive filters - default" {
+    # NOTE: the last event for bar doesn't show up reliably.
+    skip_if_remote "FIXME #10529: remote events lose data"
+    _events_disjunctive_filters ""
+}