--- Log opened Mon Jan 20 00:00:14 2020
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07:44 < raucao> after a restart earlier today, c-lightning doesn't want to fund channels anymore, telling me "Cannot estimate fees"
07:44 < raucao> i didn't find anything on github about this error
07:45 < raucao> anyone knows how i could find out what's wrong?
07:49 < raucao> hah, after an hour of fee estimation failing, it magically started working again just now. oh well. sry.
07:50 < nibbier> I'd try the estimatefee call against the bitcoind backend, see if this tells you something. but I haven't worked with c-lightning in quite some time...
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08:59 < raucao> nibbier: thx. good idea
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09:56 < darosior> notplato: "If they send me an invoice, it's because they paid an invoice that I sent them" => No
09:58 < darosior> notplato: " I want to connect them without anything other than the invoice they send back.  Is that possible?" => As I said, just use decodepay......
09:58 < darosior> The "payee" field is what you are looking for
09:58 < darosior> Here is the doc https://lightning.readthedocs.io/lightning-decodepay.7.html
09:59 < darosior> And here is an example https://0bin.net/paste/r03TJ7LW409p1Ujv#cT5Vs0SmflyFLaQ5TWCUmC8lf5TlTLi4jGbAdpvygRf
10:01 < darosior> raucao: we use the `estimatesmartfee` command, wait for bitcoind to process some blocks if it doesnt have enough data
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10:11 <@niftynei> darosior: fyi, dual-funding uses gettxout (the bitcoind API that you removed). i added it back by reverting the commit where you removed it
10:11 <@niftynei> (this is all in the dual-funding PR)
10:13 <@niftynei> raucao: i believe c-lightning relies on the bitcoind 'estimatesmartfee' command, which requires a certain number of transactions in the mempool(?not100% sure about this) in order to give you an estimate
10:15 <@niftynei> changes in bitcoind's mempool population would explain why it started working again. you can get around this error by manually providing a feerate to the fundchannel command, as a third argument after the funding amount, i.e. fundchannel node_id amount feerate; fundchannel <node_id> 100000 253perkw
10:16 <@niftynei> i thought i saw somewhere that the mempool was briefly empty? that would explain why the feerate estimation stopped working. i probably won't be able to find the tweet again 
10:21 < darosior> niftynei: Ok, I'm still working on the Bitcoin backend plugin and will conserve `gettxout`
10:22 < darosior> "which requires a certain number of transactions in the mempool(?not100% sure about this" => Yep the node needs to see some transactions in the mempool, then see them in blocks to populate "buckets" of estimation.
10:23 < darosior> "i thought i saw somewhere that the mempool was briefly empty? that would explain why the feerate estimation stopped working" => I'd rather guess on a corruption bitcoind-side as estimate are conserved and written to fee_estimates.dat
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13:18 < notplato> Is there a way to look at the logs of this channel?
13:18 < notplato> DOH! "Logs at http://gnusha.org/c-lightning/"
13:21 < notplato> darosior "payee: the public key of the recipient." I want the public key of the payer, not the payee.
13:29 < darosior> Aaah ^^
13:30 < darosior> Since the invoice is signed you can recover it from the signature
13:33 < darosior> I think you can get it out of checkmessage, but you need to zbase32 encode the message...
13:34 < darosior> That's what cdecker does here https://github.com/lightningd/plugins/pull/68/files#diff-ca0f453dc0acf9c8634cb5b461cb63a8R164
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14:06 < notplato> darosior Thanks. After thinking about it, I don't want to lock the payer into using the same Lightning Node, so "A BTC address with which you can sign messages" seems better.
14:06 < notplato> Plus I think getting people to sign stuff with their BTC private key is healthy :-).
14:07 < darosior> Not that much given the lack of `signmessage` for segwit ...
14:07 < notplato> I don't know what you mean.
14:07 < darosior> See https://github.com/bitcoin/bips/blob/master/bip-0322.mediawiki
14:07 < notplato> Thanks.
14:07 < darosior> And the bitcoin-core issue https://github.com/bitcoin/bitcoin/issues/10542
14:08 < darosior> The patch is simple, but the BIP is preferable
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15:47 < raucao> darosior, niftynei: thanks! that makes sense
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16:47 <@niftynei> cdecker, is there a dev-debugger option for plugins?
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--- Log closed Tue Jan 21 00:00:15 2020