Add chain API get_consensus_parameters 📦

[linhuang-blockone]

Add chain api endpoint and cleos get command to retrieve consensus parameters.

The chain API endpoint is /v1/chain/get_consensus_parameters. The cleos command syntax is cleos get consensus_parameters.

An example cleos session looks like

./cleos get consensus_parameters
{
  "chain_config": {
    "max_block_net_usage": 1048576,
    "target_block_net_usage_pct": 1000,
    "max_transaction_net_usage": 524288,
    "base_per_transaction_net_usage": 12,
    "net_usage_leeway": 500,
    "context_free_discount_net_usage_num": 20,
    "context_free_discount_net_usage_den": 100,
    "max_block_cpu_usage": 200000,
    "target_block_cpu_usage_pct": 1000,
    "max_transaction_cpu_usage": 150000,
    "min_transaction_cpu_usage": 100,
    "max_transaction_lifetime": 3600,
    "deferred_trx_expiration_window": 600,
    "max_transaction_delay": 3888000,
    "max_inline_action_size": 524288,
    "max_inline_action_depth": 4,
    "max_authority_depth": 6,
    "max_action_return_value_size": 256
  },
  "kv_database_config": {
    "max_key_size": 0,
    "max_value_size": 0,
    "max_iterators": 0
  },
  "wasm_config": {
    "max_mutable_global_bytes": 1024,
    "max_table_elements": 1024,
    "max_section_elements": 8192,
    "max_linear_memory_init": 65536,
    "max_func_local_bytes": 8192,
    "max_nested_structures": 1024,
    "max_symbol_bytes": 8192,
    "max_module_bytes": 20971520,
    "max_code_bytes": 20971520,
    "max_pages": 528,
    "max_call_depth": 251
  }
}

Change Description

Change Type

Select ONE:

• Documentation

• Stability bug fix

• Other

• Other - special case

Testing Changes

Select ANY that apply:

• New Tests

• Existing Tests

• Test Framework

• CI System

• Other

Consensus Changes

• Consensus Changes

API Changes

• API Changes

Documentation Additions

• Documentation Additions

A new chain API endpoint /v1/chain/get_consensus_parameters and cleos get subcommad consensus_parameters are added to retrieve consensus parameters.

[praphael]

Approved with comment: Unit tests should be added, particularly to chain_plugin_tests.cpp and plugin_http_api_test.py. For example as was done here https://github.com/EOSIO/eos/pull/10772/files

If this cannot be done a part of this PR please create a JIRA issue.

[linhuang-blockone]

https://blockone.atlassian.net/browse/EPE-1760 was created to track the test case.