Add support for Hermes to identify whether it is compatible with a chain (based on SDK version)

[greg-szabo]

Crate

relayer
relayer-cli

Summary

Test: gaiad 4.2.1 -> regen 1.1.0 transfer
(SDK 0.42.4 -> 0.43.0.beta1)

Problem Definition

The transfer goes through but the acknowledgment packet does not return.

As it turns out the WriteAcknowledgmentEv that 0.43 emits is not currently supported by hermes v0.4.0. Further testing showed that we can't initiate a transfer from the 0.43 chain either.

Proposal

The problem in general is parsing the new value of message.action field, so in some sense this issue is a duplicate of #918. We'll separate the two as follows:

• With this issue we'll capture the problem of identifying if a chain's SDK version is compatible with Hermes. This means that at initialization time Hermes should perform a chain query to the applications RPC port on endpoint /node_info and check that the SDK version falls within a compatible range. Using the command line, this looks as follows:

> curl localhost:27051/node_info | jq '.application_version.build_deps' | grep sdk
  "github.com/cosmos/cosmos-sdk@v0.42.0-rc0 => github.com/regen-network/cosmos-sdk@v0.42.4-regen-1",

for a newer SDK with changed action in events:

  "github.com/cosmos/cosmos-sdk@v0.43.0-beta1.0.20210520130629-fbb50cfa0a43",

• With issue Event parsing message.action preparation for new SDK version #918 we'll capture the specific problem of parsing and correctly interpreting events from a SDK 0.43+ chain.

Acceptance Criteria

• Add support to identify if Hermes is connected to a chain whose SDK is compatible with itself. Define what should be the appropriate behavior in case of connecting to an incompatible chain
  • one option is to at least write errors in the log and continue executing regardless (the optimistic approach)
  • slightly preferable: disconnect from the chain (prefer safety over liveness)

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate milestone (priority) applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned