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streamdiff.go
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streamdiff.go
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package main
import (
"context"
"fmt"
"net/http"
comatproto "github.com/bluesky-social/indigo/api/atproto"
"github.com/bluesky-social/indigo/events"
"github.com/bluesky-social/indigo/events/schedulers/sequential"
"github.com/gorilla/websocket"
cli "github.com/urfave/cli/v2"
)
// TODO: WIP - turns out to be more complicated than i initially thought
var streamCompareCmd = &cli.Command{
Usage: "utility to subscribe and compare output from two repo streams",
Name: "diff-stream",
Flags: []cli.Flag{},
ArgsUsage: `<hostA> <hostB>`,
Action: func(cctx *cli.Context) error {
d := websocket.DefaultDialer
args, err := needArgs(cctx, "hostA", "hostB")
if err != nil {
return err
}
hosta, hostb := args[0], args[1]
cona, _, err := d.Dial(fmt.Sprintf("%s/xrpc/com.atproto.sync.subscribeRepos", hosta), http.Header{})
if err != nil {
return fmt.Errorf("dial failure: %w", err)
}
conb, _, err := d.Dial(fmt.Sprintf("%s/xrpc/com.atproto.sync.subscribeRepos", hostb), http.Header{})
if err != nil {
return fmt.Errorf("dial failure: %w", err)
}
sd := &streamDiffer{}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
go func() {
rsc := &events.RepoStreamCallbacks{
RepoCommit: func(evt *comatproto.SyncSubscribeRepos_Commit) error {
sd.PushA(&events.XRPCStreamEvent{
RepoCommit: evt,
})
return nil
},
RepoInfo: func(evt *comatproto.SyncSubscribeRepos_Info) error {
return nil
},
// TODO: all the other Repo* event types
Error: func(evt *events.ErrorFrame) error {
return fmt.Errorf("%s: %s", evt.Error, evt.Message)
},
}
seqScheduler := sequential.NewScheduler("streamA", rsc.EventHandler)
err = events.HandleRepoStream(ctx, cona, seqScheduler)
if err != nil {
log.Errorf("stream A failed: %s", err)
}
}()
go func() {
rsc := &events.RepoStreamCallbacks{
RepoCommit: func(evt *comatproto.SyncSubscribeRepos_Commit) error {
sd.PushB(&events.XRPCStreamEvent{
RepoCommit: evt,
})
return nil
},
RepoInfo: func(evt *comatproto.SyncSubscribeRepos_Info) error {
return nil
},
// TODO: all the other Repo* event types
Error: func(evt *events.ErrorFrame) error {
return fmt.Errorf("%s: %s", evt.Error, evt.Message)
},
}
seqScheduler := sequential.NewScheduler("streamB", rsc.EventHandler)
err = events.HandleRepoStream(ctx, conb, seqScheduler)
if err != nil {
log.Errorf("stream B failed: %s", err)
}
}()
select {}
},
}
type streamDiffer struct {
Aevts []*events.XRPCStreamEvent
Bevts []*events.XRPCStreamEvent
}
func (sd *streamDiffer) PushA(evt *events.XRPCStreamEvent) {
ix := findEvt(evt, sd.Bevts)
if ix < 0 {
sd.Aevts = append(sd.Aevts, evt)
return
}
switch evtOp(evt) {
case "#commit":
e := evt.RepoCommit
oe := sd.Bevts[ix].RepoCommit
if len(e.Blocks) != len(oe.Blocks) {
fmt.Printf("seq %d (A) and seq %d (B) have different carslice lengths: %d != %d", e.Seq, oe.Seq, len(e.Blocks), len(oe.Blocks))
}
default:
}
}
func (sd *streamDiffer) PushB(evt *events.XRPCStreamEvent) {
}
func evtOp(evt *events.XRPCStreamEvent) string {
switch {
case evt.Error != nil:
return "ERROR"
case evt.RepoCommit != nil:
return "#commit"
case evt.RepoHandle != nil:
return "#handle"
case evt.RepoInfo != nil:
return "#info"
case evt.RepoMigrate != nil:
return "#migrate"
case evt.RepoTombstone != nil:
return "#tombstone"
default:
return "unknown"
}
}
func sameCommit(a, b *comatproto.SyncSubscribeRepos_Commit) bool {
return a.Repo == b.Repo && cidStr(a.Prev) == cidStr(b.Prev)
}
func findEvt(evt *events.XRPCStreamEvent, list []*events.XRPCStreamEvent) int {
evtop := evtOp(evt)
for i, oe := range list {
if evtop != evtOp(oe) {
continue
}
switch {
case evt.RepoCommit != nil:
if sameCommit(evt.RepoCommit, oe.RepoCommit) {
return i
}
case evt.RepoHandle != nil:
panic("not handling handle updates yet")
case evt.RepoMigrate != nil:
panic("not handling repo migrates yet")
default:
panic("unhandled event type: " + evtop)
}
}
return -1
}