Announcing libra-client: A CLI inteface Libra client and Python API for Libra blockchain

General
#1

Hi everyone,

We have just published libra-client, an unofficial client for Libra blockchain written in python language. The project has a cli interface client allows you interact whith Libra Network easily. For Python programmers, you can also call the client side api to interact with Libra Network.

libra_shell
libra_shell1618×844 113 KB

The client is compatible with original rust written libra client.

For python programmers, Please see Client side Libra API for python programmer for more API details.

3 Likes
#2

Very nice, great job, it works well on latest Libra testnet and LCS.

1 Like
#4

Libra-client is updated from version 0.3.x to version 0.4, with following major updates:

  1. add ledger_info and validator_verifier support. We verify the signature in ledger_info_with_sig structure against the validator’s public key.
  2. The get_transactions api now return deserialized SignedTransaction object instead of raw ptoto object.
  3. check connectivity on startup of libra_shell and check port number to be NonZeroU16.
  4. Update canoser library to support pretty print and update the api document.

During the development of libra-client, we found and fixed a few bugs in the libra core. For example, following input will raise an error：

libra% q tr 1 0 true

Getting committed transaction by range
[ERROR] Error getting committed transactions by range: Bad GetTransactions response. Events requested: true, events returned: false.

Here is the fix code:
Fix verify_get_txns_resp when zero txns returned

Other merged commits:

1 Like
#5

Hi,

Just finished to install it after installing python3.6m, pip3. I cannot use the command libra_shell

root@vps8279:~# libra_shell
libra_shell: command not found

EDIT: solved :wink:

1 Like
#6

Hm,

I facing a little connection trouble while attemting to use libra_shell :

Not able to connect to validator at ac.testnet.libra.org:8000

1 Like
#7

Maybe a temporal network problem.

1 Like
#8

Running ./start_cli_testnet.sh works but not libra_shell

1 Like
#9

I see. It’s weird :innocent:

1 Like
#10

Is this exception came from line 33 ?

1 Like
#11

Yes. This line send a blank request message to libra ac to test validate network.

    grpc_client.get_latest_transaction_version()

Add “-v” option, you can see detail message if there are errors.

$ libra_shell -v
1 Like
#12

Still the same error message I inspect libra code source to see what can be the trouble :wink:

1 Like
#13

After reading your code I found you use :

NETWORKS = {
‘testnet’:{
‘host’: “ac.testnet.libra.org”,
‘port’: 8000,
‘faucet_host’: “faucet.testnet.libra.org”
}
}

I tried to ping the faucet network but it’s still down do you think it’s the problem ?

1 Like
#14

Only mint coin will use the ‘faucet_host’, try connect ac.testnet.libra.org, for example:

telnet ac.testnet.libra.org 8000
Trying 3.220.97.74…
Connected to ac.testnet.libra.org.
Escape character is ‘^]’.

1 Like
#15

I got the same result as you writte
root@vps8279:~/.local/bin# telnet ac.testnet.libra.org 8000
Trying 3.94.73.110…
Connected to ac.testnet.libra.org.
Escape character is ‘^]’.

1 Like
#16

@ alexandre_jaquet
AFAIK, it seems fine.
image

1 Like
#17

I think I found the reason. Uninstall and then reinstall with following command:

python3 -m pip install --user --no-binary libra-client libra-client

Let me know if it works.:grinning:

1 Like
#18

Well done it work thanks a lot’s ! :slight_smile:

1 Like
#19

Hi,

I’m playing within your client and everything works well,

#!/usr/bin/perl
use warnings;
use MyDB;

my $db = MyDB->new();

main();

sub get_balance {
my $account = shift || ‘’;
system(“libra account balance $account”);
}
sub main {

my ($userID,$acheteurEmail,$compte_libra) = $db->sqlSelect("id_personne,email,compte_libra", "personne", "nom_utilisateur = 'alexandre'");
print "Compte libra Alexandre : $compte_libra\n";
get_balance($compte_libra);

}

2 Likes
#20

Libra-client is updated from version 0.5 to version 0.6, compatible with latest testnet update:

  1. Add Transaction and BlockMetadata class, parse message TransactionListWithProof to Transaction instead of SignedTransaction.
  2. Change epoch_num to epoch of LedgerInfo message.
  3. Disable proof verification Temporarily. There’s a lot of change to libra’s proof code, such as bitmap is remove.
2 Likes
#21

Hi I update libra-client within the following line of code python3.6 -m pip install --user --no-binary libra-client libra-client but now when I call account balance I got :

root@vps8279:/usr/lib/cgi-bin# libra account balance f270b16e2fec7a10937d0c32eec34a9b2280a7ab8a64e75aa8c84e3583158349
{
“balance”: 0
}

but within the same adress within libra explorer https://libexplorer.com/address/f270b16e2fec7a10937d0c32eec34a9b2280a7ab8a64e75aa8c84e3583158349