stebalien changed the topic of #ipfs to: Heads Up: To talk, you need to register your nick! Announcements: go-ipfs 0.4.19 and js-ipfs 0.34 are out! Get them from dist.ipfs.io and npm respectively! | Also: #libp2p #ipfs-cluster #filecoin #ipfs-dev | IPFS, the InterPlanetary FileSystem: https://github.com/ipfs/ipfs | Logs: https://view.matrix.org/room/!yhqiEdqNjyPbxtUjzm:matrix.org/ | Forums: https://discuss.ipfs.io | Code of
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<growlster>
hello dear IPFS team
<growlster>
greetings from the Swarm team
<growlster>
@stebalien I'd be interested in following up on the Swarm Multicodecs PR if there's anything hindering its merge
<stebalien>
growlster: sorry, only time.
<stebalien>
Actually, now that I have you. How does the BMT hash function work>
<stebalien>
(and thanks for pinging me)
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<growlster>
The underlying hash function used is keccak256 as with the rest of the go-ethereum codebase. Data chunks are broken down into a 128 x 32 byte leafs, those are hashed through a keccak256 hashing function to create the root (and intermediate) hash
<stebalien>
Got it. It looks like it exists to allow for inclusion proofs. SGTM.
<growlster>
correct
<growlster>
i've also changed the swarm manifest/feed types to be IPLD codecs, however I'm afraid that I don't 100% understand the repercussions
<growlster>
i.e. if there are any changes that will have to be propagated to the IPLD spec/repo
<stebalien>
No. This looks good to me.
<growlster>
awesome
<growlster>
another question that i had is: do you implement any code generators in your pipeline that handle updating the cascade of libraries that depend on the data in the multicodecs repo?
<growlster>
i.e. in the case of golang - using generators to update the go library with the new codes from multicodecs
<stebalien>
Not currently. Most of codecs require manual implementation (e.g., a hash function, a serializer/deserializer).
<stebalien>
Unless I'm misunderstanding your question.
<growlster>
surely those would have to be added manually
<growlster>
i meant more like populating the basic hex codes with a generator, since the names of the codecs and their respective codes are already in the CSV
<growlster>
so a go generator for example could populate all of the codes as consts with the respective names (i.e. const SHA2_256 = 0x12 and so on...)
<growlster>
just a thought, as i think that it would make life easier when updating the language specific implementations (and eliminate possible errors in the process)
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<stebalien>
Ah. Yeah, we should add those but we've never had so many codes that we really felt motivated to put in the effort. But really, we should.
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<Bl4ckC0r3>
hello
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<stebalien>
Completely unrelated, any last-minute IPFS demo suggestions?
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<francis[m]2>
> > <@franc1s:matrix.org> Is there an Android ipfs client that you can recomnend?
<francis[m]2>
> Sweet IPFS is one that comes to mind
<francis[m]2>
None of the androud apps get grwat reviews although doesnt scare me 😁
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<dietricha>
@stebalien I'll be there! Will you have a demo table?
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<stebalien>
diegosouza: We will.
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<mattober[m]>
For those of you who encrypt files before uploading to IPFS, what mechanisms are you using? I'm trying to see if there's any common encryption schemes people prefer with IPFS specifically.
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<AphelionZ>
mattober[m]: we use libsodium.js
<mattober[m]>
What's your project called?
<AphelionZ>
Tallylab
<AphelionZ>
To the channel, I'm really curious what's stopping ipfs.io from discovering content I keep in my browser's IPFS store
<mattober[m]>
oh hey! didn't know that was your username
<AphelionZ>
oh, hey!
<AphelionZ>
you've heard of us
<AphelionZ>
:)
<mattober[m]>
hope things have been going well
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<AphelionZ>
thanks, they've been pretty good. trying to break out of just being a community app and into the mainstream is our current challenge
<AphelionZ>
we really want to be a consumer app
<mattober[m]>
This is matt from Pinata
<AphelionZ>
oh cool, how are things going on your end?
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<AphelionZ>
can anybody get this hash? QmXhGSkvrVuAFJhcJLpS8CwzgYHR9R6u6ghHAQBNd3bp9h
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<AphelionZ>
i SWEAR i used to be able to add content to the browser's IPFS node and have ipfs.io pick it up
<AphelionZ>
am I crazy??
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<BenLubar>
ah, I need to use github.com/ipfs/go-ipfs-files apparently
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<MrBubbles[m]>
[testing 123]
<MrBubbles[m]>
AWESOME! Finally got Riot up and running, and finally in. yay
<MrBubbles[m]>
A fair bit random, but I'm on a team (systems engineering graduating capstone) that's exploring interplanetary network topologies and file storage/transfer systems. Will very likely be using IPFS for this Earth-Mars-Io test case, and if anyone wants a free copy of whatever spaghetti we whip up, feel free to message me and I'll send it over in a few months when we're done.
<MrBubbles[m]>
That's all, no questions yet, hah. Just saying hi while I read through all the docs :)
<AphelionZ>
how are you simulating earth/mars? 12 min delay?
<MrBubbles[m]>
.... yup
<AphelionZ>
haha cool, i'm into it
<MrBubbles[m]>
Oh crap, I need to add that delay to Matrix now too :P
<AphelionZ>
using the built-in CBOR compression and clever JSON structures they were able to get it down to < 1 byte per record or some insane metric like that
<MrBubbles[m]>
whaaaaat?!? No, I haven't. Checking it out right now
<MrBubbles[m]>
holy frig this is exactly up our alley
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<AphelionZ>
nice!
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<lordcirth_>
Does it really increase performance that much?
<mvollrath>
when you're packing binary data into an extensible structure, it is orders of magnitude faster than JSON in a browser
<AphelionZ>
lordcirth_: the article shows they put a LOT of effort into compression pre-CBOR but yeah it's pretty great
<AphelionZ>
and also they show in the article that their compressed JSON can at times be compressed smaller than CBOR allows for (i.e. CBOR makes it worse) but it's still some really impressive work and important findins
<mvollrath>
only because they were using double precision float in CBOR
<AphelionZ>
yeah mostly just something good to be aware of, not a failing of CBOR
<lordcirth_>
Ah, yeah doubles can be useful too
<mvollrath>
it is a really good article for sure
<mvollrath>
if the values were actually full double precision JSON would use a lot more bytes, so i think the article is a bit misleading in this case
<lordcirth_>
Which article are you talking about? (I just joined)
<lordcirth_>
Ah, I didn't realize that IPFS was already using CBOR
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<deltab>
CBOR's expansion of floats can be avoided by scaling the values (multiplying by 1000, for instance)
<deltab>
to get integers, I mean
<deltab>
depending on the sensor resolution, of course
<mvollrath>
you can specify 16 32 or 64-bit float precision with CBOR, many encoders will just always use 64-bit
<mvollrath>
especially encoders which are transcoding JSON
<mvollrath>
or transcoding from an object in python, javascript etc.
<deltab>
ah
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<eirikur[m]>
HTTP API question. When I use get, text files seem to work with only some minor issues, but binaries such as images are corrupted. The go ipfs get command works perfectly. I've grepped the source, but not found why this might be happening.
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<eirikur[m]>
I'm using the curl examples from the docs. /api/v0/block/get
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<eirikur[m]>
Okay, I used the curl example to grab the list of commands. So, there's an undocumented data-encoding parameter.
<eirikur[m]>
Okay, I found a document that actually describes this. It seems that I can specify base64 or text and it defaults to text.
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<eirikur[m]>
Well, that's not the answer, either. I need help.
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<lordcirth_>
eirikur[m], There's a flag to download as a tar file. it might be defaulting to that
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<lordcirth_>
eirikur[m], also, try running 'file' on the downloaded file, it will tell you if it recognizes the format
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<lordcirth_>
Hmm, apparently that's a different 'get' that I'm thinking of
<lordcirth_>
eirikur[m], sure you're using /api/v0/block/get and not /api/v0/get ?
<lordcirth_>
Because the latter can use tar
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