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dist.go
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dist.go
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package ads
import (
"fmt"
"github.com/ipfs/go-cid"
"github.com/ipni/ipni-cli/pkg/dtrack"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/urfave/cli/v2"
)
var adsDistSubCmd = &cli.Command{
Name: "dist",
Usage: "Determine the distance between two advertisements in a chain",
Description: "Sepcify the start and optional end advertisement CIDs. If end CID is not specified use the latest advertisement",
Flags: adsDistFlags,
Action: adsDistAction,
}
var adsDistFlags = []cli.Flag{
addrInfoFlag,
&cli.StringFlag{
Name: "start",
Usage: "CID of earliest advertisement in chain",
Required: true,
},
&cli.StringFlag{
Name: "end",
Usage: "CID of advertisement later in chain. If not specified, use the latest advertisement",
},
&cli.BoolFlag{
Name: "quiet",
Usage: "Output only the distance",
Aliases: []string{"q"},
},
&cli.Int64Flag{
Name: "dist-limit",
Usage: "Limit the amount of distance to traverse",
Aliases: []string{"dl"},
Value: 5000,
},
topicFlag,
}
func adsDistAction(cctx *cli.Context) error {
addrInfo, err := peer.AddrInfoFromString(cctx.String("addr-info"))
if err != nil {
return fmt.Errorf("bad pub-addr-info: %w", err)
}
startCid, err := cid.Decode(cctx.String("start"))
if err != nil {
return fmt.Errorf("bad start cid: %w", err)
}
adDist, err := dtrack.NewAdDistance(
dtrack.WithTopic(cctx.String("topic")),
dtrack.WithDepthLimit(cctx.Int64("dist-limit")))
if err != nil {
return err
}
var endStr string
var endCid cid.Cid
if cctx.String("end") != "" {
endCid, err = cid.Decode(cctx.String("end"))
if err != nil {
return fmt.Errorf("bad end cid: %w", err)
}
endStr = endCid.String()
} else {
endStr = "head"
}
adCount, _, err := adDist.Get(cctx.Context, *addrInfo, startCid, endCid)
if err != nil {
return err
}
if cctx.Bool("quiet") {
fmt.Println(adCount)
} else {
fmt.Printf("Distance from %s to %s is %d\n", startCid, endStr, adCount)
}
return nil
}