Improve Taker's offerbook

[mojoX911]

Make the taker's offerbook smarter so we don't have to redownload offers everytime for a swap.

[ab-oggm]

What do you mean by making it smarter?
Inside the send_coinswap we sync_offerbook to get the latest offers. How do you think of making it smarter.

• Do you suggest running some background process in a fixed interval to fetch the offer book and maintain a timestamp of the latest fetch, which we can directly call inside coinswap(latest time fetch) instead of calling sync_offerbook?

[mojoX911]

Do you suggest running some background process in a fixed interval to fetch the offer book and maintain a timestamp of the latest fetch, which we can directly call inside coinswap(latest time fetch) instead of calling sync_offerbook?

Yes exactly. First step of smartness is to note a timestamp so we don't redownload recently downloaded offers again. The cutoff could be 30 mins, if last timestamp is more than 30 mins, redownload again.

2nd smartness is, having unique index for makers for which taker could manually select multiple makers to swap with. An interactive flow for the taker app, as suggested for manual utxo selection here will be even more perfect.

Further smartness could be, ban scoring, deciding on a strategy on give various ban score to makers, and set a ban score cutoof, beyond which makers will not be selected for swaps. Send feedback on maker's ban score to DNS, so other taker's also gets to know about bad makers. This requires more thoughts and can be done later.

For this issue only the timestamping and manual maker selection from offerbook would be enough.

[ab-oggm]

@mojoX911 do we have some doc to setup the DNS locally instead of using the hosted DNS. Will be easier to solve this issue.