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package commands
import (
"context"
"fmt"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/spf13/cobra"
v1 "github.com/authzed/authzed-go/proto/authzed/api/v1"
"github.com/authzed/zed/internal/client"
"github.com/authzed/zed/internal/console"
)
var (
watchObjectTypes []string
watchRevision string
watchTimestamps bool
watchRelationshipFilters []string
)
func RegisterWatchCmd(rootCmd *cobra.Command) *cobra.Command {
rootCmd.AddCommand(watchCmd)
watchCmd.Flags().StringSliceVar(&watchObjectTypes, "object_types", nil, "optional object types to watch updates for")
watchCmd.Flags().StringVar(&watchRevision, "revision", "", "optional revision at which to start watching")
watchCmd.Flags().BoolVar(&watchTimestamps, "timestamp", false, "shows timestamp of incoming update events")
return watchCmd
}
func RegisterWatchRelationshipCmd(parentCmd *cobra.Command) *cobra.Command {
parentCmd.AddCommand(watchRelationshipsCmd)
watchRelationshipsCmd.Flags().StringSliceVar(&watchObjectTypes, "object_types", nil, "optional object types to watch updates for")
watchRelationshipsCmd.Flags().StringVar(&watchRevision, "revision", "", "optional revision at which to start watching")
watchRelationshipsCmd.Flags().BoolVar(&watchTimestamps, "timestamp", false, "shows timestamp of incoming update events")
watchRelationshipsCmd.Flags().StringSliceVar(&watchRelationshipFilters, "filter", nil, "optional filter(s) for the watch stream. Example: `optional_resource_type:optional_resource_id_or_prefix#optional_relation@optional_subject_filter`")
return watchRelationshipsCmd
}
var watchCmd = &cobra.Command{
Use: "watch [object_types, ...] [start_cursor]",
Short: "Watches the stream of relationship updates from the server",
Args: ValidationWrapper(cobra.RangeArgs(0, 2)),
RunE: watchCmdFunc,
Deprecated: "deprecated; please use `zed watch relationships` instead",
}
var watchRelationshipsCmd = &cobra.Command{
Use: "watch [object_types, ...] [start_cursor]",
Short: "Watches the stream of relationship updates from the server",
Args: ValidationWrapper(cobra.RangeArgs(0, 2)),
RunE: watchCmdFunc,
}
func watchCmdFunc(cmd *cobra.Command, _ []string) error {
console.Printf("starting watch stream over types %v and revision %v\n", watchObjectTypes, watchRevision)
cli, err := client.NewClient(cmd)
if err != nil {
return err
}
relFilters := make([]*v1.RelationshipFilter, 0, len(watchRelationshipFilters))
for _, filter := range watchRelationshipFilters {
relFilter, err := parseRelationshipFilter(filter)
if err != nil {
return err
}
relFilters = append(relFilters, relFilter)
}
req := &v1.WatchRequest{
OptionalObjectTypes: watchObjectTypes,
OptionalRelationshipFilters: relFilters,
}
if watchRevision != "" {
req.OptionalStartCursor = &v1.ZedToken{Token: watchRevision}
}
ctx, cancel := context.WithCancel(cmd.Context())
defer cancel()
signalctx, interruptCancel := signal.NotifyContext(ctx, os.Interrupt, syscall.SIGTERM, syscall.SIGINT)
defer interruptCancel()
watchStream, err := cli.Watch(ctx, req)
if err != nil {
return err
}
for {
select {
case <-signalctx.Done():
console.Errorf("stream interrupted after program termination\n")
return nil
case <-ctx.Done():
console.Errorf("stream canceled after context cancellation\n")
return nil
default:
resp, err := watchStream.Recv()
if err != nil {
return err
}
for _, update := range resp.Updates {
if watchTimestamps {
console.Printf("%v: ", time.Now())
}
switch update.Operation {
case v1.RelationshipUpdate_OPERATION_CREATE:
console.Printf("CREATED ")
case v1.RelationshipUpdate_OPERATION_DELETE:
console.Printf("DELETED ")
case v1.RelationshipUpdate_OPERATION_TOUCH:
console.Printf("TOUCHED ")
}
subjectRelation := ""
if update.Relationship.Subject.OptionalRelation != "" {
subjectRelation = " " + update.Relationship.Subject.OptionalRelation
}
console.Printf("%s:%s %s %s:%s%s\n",
update.Relationship.Resource.ObjectType,
update.Relationship.Resource.ObjectId,
update.Relationship.Relation,
update.Relationship.Subject.Object.ObjectType,
update.Relationship.Subject.Object.ObjectId,
subjectRelation,
)
}
}
}
}
func parseRelationshipFilter(relFilterStr string) (*v1.RelationshipFilter, error) {
relFilter := &v1.RelationshipFilter{}
pieces := strings.Split(relFilterStr, "@")
if len(pieces) > 2 {
return nil, fmt.Errorf("invalid relationship filter: %s", relFilterStr)
}
if len(pieces) == 2 {
subjectFilter, err := parseSubjectFilter(pieces[1])
if err != nil {
return nil, err
}
relFilter.OptionalSubjectFilter = subjectFilter
}
if len(pieces) > 0 {
resourcePieces := strings.Split(pieces[0], "#")
if len(resourcePieces) > 2 {
return nil, fmt.Errorf("invalid relationship filter: %s", relFilterStr)
}
if len(resourcePieces) == 2 {
relFilter.OptionalRelation = resourcePieces[1]
}
resourceTypePieces := strings.Split(resourcePieces[0], ":")
if len(resourceTypePieces) > 2 {
return nil, fmt.Errorf("invalid relationship filter: %s", relFilterStr)
}
relFilter.ResourceType = resourceTypePieces[0]
if len(resourceTypePieces) == 2 {
optionalResourceIDOrPrefix := resourceTypePieces[1]
if strings.HasSuffix(optionalResourceIDOrPrefix, "%") {
relFilter.OptionalResourceIdPrefix = strings.TrimSuffix(optionalResourceIDOrPrefix, "%")
} else {
relFilter.OptionalResourceId = optionalResourceIDOrPrefix
}
}
}
return relFilter, nil
}
func parseSubjectFilter(subjectFilterStr string) (*v1.SubjectFilter, error) {
subjectFilter := &v1.SubjectFilter{}
pieces := strings.Split(subjectFilterStr, "#")
if len(pieces) > 2 {
return nil, fmt.Errorf("invalid subject filter: %s", subjectFilterStr)
}
subjectTypePieces := strings.Split(pieces[0], ":")
if len(subjectTypePieces) > 2 {
return nil, fmt.Errorf("invalid subject filter: %s", subjectFilterStr)
}
subjectFilter.SubjectType = subjectTypePieces[0]
if len(subjectTypePieces) == 2 {
subjectFilter.OptionalSubjectId = subjectTypePieces[1]
}
if len(pieces) == 2 {
subjectFilter.OptionalRelation = &v1.SubjectFilter_RelationFilter{
Relation: pieces[1],
}
}
return subjectFilter, nil
}
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