--- Log opened Sun Jul 19 00:00:25 2020
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01:27 < vincenzopalazzo> Hi guys, today I want to make a question about pending payment, for example when payment is pending inside the network is possible to undo the operation? For example, I make a payment to the blockstream store and during the payment, I change my mind about the order, if the payment has the pending status I can undo the payment? From the code, I understand that this is not possible but I can lose somethings. 
01:28 < zmnscpxj__> this is not possible at all.
01:28 < zmnscpxj__> at a spec level
01:28 < zmnscpxj__> if it were to be possible, then I can steal from forwarding nodes:
01:28 < zmnscpxj__> send a self-payment
01:28 < zmnscpxj__> I send a "cancel outgoing" and "claim incoming" message at the same time
01:29 < zmnscpxj__> I get to cancel the outgoing payment and claim the incoming funds, leaving somebody else on the network bereft of those funds
01:31 < vincenzopalazzo> Thanks for answer, I understand. Well, I want make a directly question. I'm working on a good first issue, like this https://github.com/ElementsProject/lightning/issues/1995
01:31 < vincenzopalazzo> I'm adding the method delpay and at the moment I implemented (or I try to implement) a delpay with only one parameter, For instance "delpay bolt11"
01:32 < zmnscpxj__> the intent is to remove historically-completed payments
01:32 < zmnscpxj__> not ongoing ones
01:33 < zmnscpxj__> basically, the intent is only to prune the output of `listpayments`
01:33 < zmnscpxj__> could also accept a hash
01:34 < zmnscpxj__> since we do not store outgoing bolt11 (or even invoices we issued)
01:36 < vincenzopalazzo> Wow, good information. Thanks. So, I can filter the payment by complete status, and what about the fail payment? I could want remove the fail payment?
01:36 < zmnscpxj__> imitate delinvoice: have the caller explicitly say it knows the payment is failed
01:37 < zmnscpxj__> payments can be "temporarily failed", with the `pay` plugin still running
01:38 < zmnscpxj__> we kind of filter this out with `listpayments` which is in the `pay` plugin, but `delpay` has to be in `lightningd`, so it is better to be careful
01:41 < vincenzopalazzo> Done, thanks for your feedback I will play a little bit with the code and the use case and after if I will have a draft solution I will open a PR. Thank you again
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--- Log closed Mon Jul 20 00:00:25 2020