Add event logging to libpod, even display to podman

In lipod, we now log major events that occurr.  These events
can be displayed using the `podman events` command. Each
event contains:

* Type (container, image, volume, pod...)
* Status (create, rm, stop, kill, ....)
* Timestamp in RFC3339Nano format
* Name (if applicable)
* Image (if applicable)

The format of the event and the varlink endpoint are to not
be considered stable until cockpit has done its enablement.

Signed-off-by: baude <bbaude@redhat.com>

1 files changed, 115 insertions, 0 deletions

diff --git a/cmd/podman/shared/events.go b/cmd/podman/shared/events.go
new file mode 100644
index 000000000..c62044271
--- /dev/null
+++ b/cmd/podman/shared/events.go
@@ -0,0 +1,115 @@
+package shared
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/containers/libpod/libpod/events"
+	"github.com/containers/libpod/pkg/util"
+	"github.com/pkg/errors"
+)
+
+func generateEventFilter(filter, filterValue string) (func(e *events.Event) bool, error) {
+	switch strings.ToUpper(filter) {
+	case "CONTAINER":
+		return func(e *events.Event) bool {
+			if e.Type != events.Container {
+				return false
+			}
+			if e.Name == filterValue {
+				return true
+			}
+			return strings.HasPrefix(e.ID, filterValue)
+		}, nil
+	case "EVENT", "STATUS":
+		return func(e *events.Event) bool {
+			return fmt.Sprintf("%s", e.Status) == filterValue
+		}, nil
+	case "IMAGE":
+		return func(e *events.Event) bool {
+			if e.Type != events.Image {
+				return false
+			}
+			if e.Name == filterValue {
+				return true
+			}
+			return strings.HasPrefix(e.ID, filterValue)
+		}, nil
+	case "POD":
+		return func(e *events.Event) bool {
+			if e.Type != events.Pod {
+				return false
+			}
+			if e.Name == filterValue {
+				return true
+			}
+			return strings.HasPrefix(e.ID, filterValue)
+		}, nil
+	case "VOLUME":
+		return func(e *events.Event) bool {
+			if e.Type != events.Volume {
+				return false
+			}
+			return strings.HasPrefix(e.ID, filterValue)
+		}, nil
+	case "TYPE":
+		return func(e *events.Event) bool {
+			return fmt.Sprintf("%s", e.Type) == filterValue
+		}, nil
+	}
+	return nil, errors.Errorf("%s is an invalid filter", filter)
+}
+
+func generateEventSinceOption(timeSince time.Time) func(e *events.Event) bool {
+	return func(e *events.Event) bool {
+		return e.Time.After(timeSince)
+	}
+}
+
+func generateEventUntilOption(timeUntil time.Time) func(e *events.Event) bool {
+	return func(e *events.Event) bool {
+		return e.Time.Before(timeUntil)
+
+	}
+}
+
+func parseFilter(filter string) (string, string, error) {
+	filterSplit := strings.Split(filter, "=")
+	if len(filterSplit) != 2 {
+		return "", "", errors.Errorf("%s is an invalid filter", filter)
+	}
+	return filterSplit[0], filterSplit[1], nil
+}
+
+func GenerateEventOptions(filters []string, since, until string) ([]events.EventFilter, error) {
+	var options []events.EventFilter
+	for _, filter := range filters {
+		key, val, err := parseFilter(filter)
+		if err != nil {
+			return nil, err
+		}
+		funcFilter, err := generateEventFilter(key, val)
+		if err != nil {
+			return nil, err
+		}
+		options = append(options, funcFilter)
+	}
+
+	if len(since) > 0 {
+		timeSince, err := util.ParseInputTime(since)
+		if err != nil {
+			return nil, errors.Wrapf(err, "unable to convert since time of %s", since)
+		}
+		options = append(options, generateEventSinceOption(timeSince))
+	}
+
+	if len(until) > 0 {
+		timeUntil, err := util.ParseInputTime(until)
+		if err != nil {
+			return nil, errors.Wrapf(err, "unable to convert until time of %s", until)
+		}
+		options = append(options, generateEventUntilOption(timeUntil))
+	}
+	return options, nil
+}