Lens provides a command line tool to interact with any cosmos chain supporting the core Cosmos-SDK modules.

Lens is meant to be imported as a library in other repos and projects to easily navigate and interact with the Cosmos Hub along with IBC chains.

lens is your lens to view the Cosmos . lens packs all the best practices in golang cosmos client development into one place and provides a simple and easy to use APIs provided by standard Cosmos chains. The cmd package implements the lens command line tool while the client package contains all the building blocks to build your own, complex, feature rich, Cosmos client in go.

Intended use cases:

• Trading Bots
• Server side query integrations for alerting or other automation
• Indexers and search engines
• Transaction automation (x/authz for security) for farming applications
• ...:atom::rocket::moon:

This is the start of ideas around how to implement the cosmos client libraries in a seperate repo.

git clone https://github.com/strangelove-ventures/lens.git

cd lens

make install

Now run:

lens

You should see:

❯ lens            
This is my lens, there are many like it, but this one is mine.

Usage:
  lens [command]

Available Commands:
  chains      manage local chain configurations
  keys        manage keys held by the relayer for each chain
  query       query things about a chain
  tendermint  all tendermint query commands
  tx          query things about a chain
  help        Help about any command

Flags:
      --chain string   override default chain
  -d, --debug          debug output
  -h, --help           help for lens
      --home string    set home directory (default "/Users/lenscrafters/.lens")

Use "lens [command] --help" for more information about a command.

The config file describes how lens will interact with blockchains. This is where information such as grpc addresses and chain-ids are held.

Config File Location: ~/.lens/config.yaml

NOTE: The config file is not created at install, it is created the first time lens needs to query your config. Just to get it created, you can run something like:

lens chains show-default

Lens comes with two default chains. Cosmos Hub and Osmosis.

To interact with other chains, you need to add them to your config. To do this, run:

lens chains add <chain_name>
#Example:
lens chains add juno

To view all possible chain names, run:

lens chains registry-list

NOTE: These two commands check the chain registry located here, for the requested chain.

When running a command, it will run the command for the defaulted chain.

To view your default chain, run:

 lens chains show-default

To change your default, run:

lens chains set-default <chain_name>

Lens uses the keyring from the Cosmos-sdk. There is more information about it here.

To add a key to lens you have two options:

• lens keys add - This will add a key to you default chain and name it "default". You can optionally add a name as an argument.
• lens keys restore <name> - This will restore a key to your default chain. Replace '<name>' with a key name. This command will THEN ask for your mnemonic which is needed to restore and use it to boradcast transactions.

❗️ NOTE: IF you name your key anything other than "default", you will need to manually change the key: value in your config to link key with chain.

default_chain: cosmoshub
chains:
 cosmoshub:
   key: default #CHANGE THIS NAME
   chain-id: cosmoshub-4
   rpc-addr: https://cosmoshub-4.technofractal.com:443
   ...

After generating or restoring a key, it should appear in your list by running: lens keys list, by default it will show the Cosmos Hub address.

To see the key encoded for use on other chains run lens keys enumerate <key_name>.

Find examples of using Lens as a Go module in our Examples Repository