bigchaindb/bigchaindb

The blockchain database

michelescarlato

@michelescarlato

@zzappie

It means that there is no automatic way to keep track of who has a pair of key?

How can an organization be sure that a particular transaction is belonging to a specific person?

Which approach do you suggest in order to keep track of the issued keys?

David Dashyan

@zzappie

@michelescarlato You can query mongodb. I suggest reading bigchaindb/docs/root/source/query.rst you will find link to other resources. At the moment It is up to node operator. I am not 100% sure maybe in some branch there was an effort to expose public keys I haven't heard of

You can make a feature suggestion and we will consider it at some point

aayushm72

@aayushm72

Hi! I'm trying to do the following, CREATE -> TRANSFER -> TRANSFER -> TRANSFER ->.....but the Transfer transactions happen at a later time, how do i get the transaction id of the latest transaction involving that asset?

pdelgadohurtado

@pdelgadohurtado

Hi guys, i wanna know how BigChainDb distribute the information at database-level ? Where i can find information about this...

Ivan Kotelnikov

@eternalflow

@zzappie
I was hacking around bigchaindb-node-ansible
it almost works for me now, but still falls on "postconfig" step

This strange error always shows up for subset of nodes and I can't figure out why

michelescarlato

@michelescarlato

@eternalflow can you post the network.yml for those nodes ?

David Dashyan

@zzappie

@aayushm72 You can use bigchaindb server query api for that. There is last_tx option just for this purpose

@pdelgadohurtado What do you mean by distribute at database-level? Every node has it's local database, but all communication is done via Tendermint. Here is a nice picture --

https://blockchain.cyberagent.studio/wp-content/uploads/2018/12/Screen-Shot-2018-11-06-at-15.54.36.png

David Dashyan

@zzappie

@pdelgadohurtado /bigchaindb/bigchaindb/backend/README.md - you may find this one useful.

David Dashyan

@zzappie

@eternalflow Hey. This is indeed strange. This error means that one of these commands didn't work as expected:

- name: Register genesis time
  shell: |
    cat /home/{{ tendermint_user }}/.tendermint/config/genesis.json | jq .genesis_time
  register: genesis_time
  become: yes

- name: Register chain id
  shell: |
    cat /home/{{ tendermint_user }}/.tendermint/config/genesis.json | jq .chain_id
  register: chain_id
  become: yes

@eternalflow I suggest trying to print out genesis_time and chain_id values to see whats going on -- see https://docs.ansible.com/ansible/latest/modules/debug_module.html

David Dashyan

@zzappie

@eternalflow or just comment out some steps and ssh into machine causing problems and see whether tendermint binary is in place and what are results of "tendermint init"

Scott Guyton

@kiljoy001

@zzappie would it be correct to commit data onchain and then when a client retrives / queries data it is checking the mongodb instance for it?

David Dashyan

@zzappie

@kiljoy001 I duno :) You mean could there be a situation when data is already on-chain but not yet present in mongo?

Scott Guyton

@kiljoy001

@zzappie yeah, that's basically what I was wondering

James Rolfe

@Jnrolfe

Hi everyone. I am new to BigchainDB and am having trouble setting up a local dev node. I followed the steps here: https://docs.bigchaindb.com/projects/contributing/en/latest/dev-setup-coding-and-contribution-process/run-node-with-docker-compose.html after cloning the master the branch of the repo here: https://github.com/bigchaindb/bigchaindb . Whenever I spin up the containers (using docker-compose) I get the following error from the bigchaindb container which then causes the tendermint container to fail after retries. Any help would be appreciated. Thanks!

David Dashyan

@zzappie

@Jnrolfe Hi! Oooh bad. This affects all bighchaindb installations right now. It caused by recent gevent API update. Ill make an update ready today. Right now you can fix the bigchaindb-abci gevent dependency to "gevent==1.3.7" in setup.py

David Dashyan

@zzappie

@kiljoy001 If you check out the /bigchaindb/bigchaindb/core.py there is a 'commit' method that us used to commits a block to the Tendermint. There you'll find that transactions are stored in Mongodb self.bigchaindb.store_bulk_transactions(self.block_transactions) just before they are committed

@kiljoy001 BTW checkout the /bigchaindb/docs/server/source/events/websocket-event-stream-api.rst

David Dashyan

@zzappie

@Jnrolfe The fix is now in bigchaindb-abci-update branch.

James Rolfe

@Jnrolfe

@zzappie Thanks!

Jürgen Eckel

@eckelj

@zzappie /all I just reviewed and deployed the packages that fix the gevent issue mentioned by @zzappie BigchainDB comes now in version 2.2.1

kishor Garkal

@kishorgarkal

Hi, I am looking for iOS library for BigchainDb for iOS Application development ? is there any library available like Java,Nodejs,C# for Swift ,Objective C ?

kishor Garkal

@kishorgarkal

We are looking forward to develope new iOS app using bigchaindb library which will work similar to java library which is available on this bigchaindb official site https://www.bigchaindb.com/developers/getstarted/

kishor Garkal

@kishorgarkal

@zzappie

Scott Guyton

@kiljoy001

@kishorgarkal there are some community libraries for C#. There isn't a swift or objective C version that I know off

kishor Garkal

@kishorgarkal

@kiljoy001 is there any way to develope same feature library in objective c or in swift I am intrested to work on this if I got developer/community support for this development....I will try to implement this in swift ! I have tried Java and C library to use in Swift project but there are some more changes required in C and Java library to use in that Swift file due to lack of knowledge in bigchaindb library I am unable to proceed further in Java and C............Can Anyone help me in this scenario ????

Scott Guyton

@kiljoy001

Well, I think it's possible - I think a lot of the calls with the driver are actually based on mongodb, so you can look at the existing code base and re-implement it in your language of choice. It will be no small feat though.

kishor Garkal

@kishorgarkal

Okay @kiljoy001 ! I will try to build ! May Be I required support from you/community/team.I am here when ever I get problem In Swift library development....Thanks ....I will go through with library again....

or also tell me if @kiljoy001 anyone from bigchaindb team is allready developing this library....or in process

Scott Guyton

@kiljoy001

I don't know, I haven't heard anything about it. However, if you are set on building a mobile app, and need IOS, you might want to think about xamarin - you can build a cross platform app with it in C# and there is already a C# driver avaliable, so you don't have to re-invent the wheel, so to speak.

kishor Garkal

@kishorgarkal

@kiljoy001 we allready finalise development in native ios and native android only so finding solutions for the same now

Scott Guyton

@kiljoy001

Ah, no worries. Just thought I'd suggest it, since I knew about it.

kishor Garkal

@kishorgarkal

@kiljoy001 Thank you man...I hope you all are safe in COVID-19 pandemic...Stay home stay safe

Scott Guyton

@kiljoy001

Thanks, you too

michelescarlato

@michelescarlato

@eternalflow and @zzappie
I got the same error of eternaflow.

Essentially I am not able to run more than 4 nodes.
I was trying to run the ansbile script using 10 nodes, but most of the time only 3 nodes are able to sync.

this is a screenshot when I tried with 5 nodes

michelescarlato

@michelescarlato

these are the screenshots when I tried to run 10 nodes

this last screenshot is related to the file/root/ .tendermint/config/config.toml, which is generated after the execution of /home/tendermint/tendermint init

michelescarlato

@michelescarlato

do you think it is possible that there is the need to change some parameter which is avoiding to run topologies with more than 3 or 4 nodes ?

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@Ada922

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