Rename chain_info config parameter to chain_metadata and define its type

config.yaml.example

@@ -13,11 +13,16 @@ registrations_open: true
 blockchains:
   # Parameters for hardhat local node
   - chain_id: eip155:31337
-    chain_info: null
+    chain_metadata:
+      chain_name: localhost
+      currency_name: ETH
+      currency_symbol: ETH
+      currency_decimals: 18
+      public_api_url: 'http://127.0.0.1:8546'
+      explorer_url: null
     contract_address: '0xDc64a140Aa3E981100a9becA4E685f962f0cF6C9'
     contract_dir: contracts
     api_url: 'http://127.0.0.1:8546'
-    explorer_url: null
     signing_key: 'ac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80'
     chain_sync_step: 100
     chain_reorg_max_depth: 0

contrib/mitra_config.yaml

@@ -27,14 +27,20 @@ registrations_open: false
 #blocked_instances: []
 
 # Blockchain integrations
+# Chain metadata for EVM chains can be found at https://github.com/ethereum-lists/chains
 # Signing key for ethereum integration can be generated with `mitractl generate-ethereum-address`
 #blockchains:
 #  - chain_id: eip155:31337
-#    chain_info: null
+#    chain_metadata:
+#      chain_name: localhost
+#      currency_name: ETH
+#      currency_symbol: ETH
+#      currency_decimals: 18
+#      public_api_url: 'http://127.0.0.1:8545'
+#      explorer_url: null
 #    contract_address: '0xDc64a140Aa3E981100a9becA4E685f962f0cF6C9'
 #    contract_dir: /usr/share/mitra/contracts
 #    api_url: 'http://127.0.0.1:8545'
-#    explorer_url: null
 #    signing_key: null
 #    chain_sync_step: 1000
 #    chain_reorg_max_depth: 10

src/config/blockchain.rs

@@ -1,7 +1,6 @@
-use std::collections::HashMap;
 use std::path::PathBuf;
 
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 
 use crate::ethereum::utils::{parse_caip2_chain_id, ChainIdError};
 use crate::utils::caip2::ChainId;
@@ -10,17 +9,28 @@ fn default_chain_sync_step() -> u64 { 1000 }
 
 fn default_chain_reorg_max_depth() -> u64 { 10 }
 
+#[derive(Clone, Deserialize, Serialize)]
+pub struct EthereumChainMetadata {
+    pub chain_name: String,
+    pub currency_name: String,
+    pub currency_symbol: String,
+    pub currency_decimals: u8,
+    pub public_api_url: String,
+    // Block explorer base URL (should be compatible with https://eips.ethereum.org/EIPS/eip-3091)
+    pub explorer_url: Option<String>,
+}
+
 #[derive(Clone, Deserialize)]
 pub struct EthereumConfig {
     // CAIP-2 chain ID
     pub chain_id: ChainId,
     // Additional information for clients
-    pub chain_info: Option<HashMap<String, String>>,
+    // https://github.com/ethereum-lists/chains
+    pub chain_metadata: Option<EthereumChainMetadata>,
+
     pub contract_address: String,
     pub contract_dir: PathBuf,
     pub api_url: String,
-    // Block explorer base URL (should be compatible with https://eips.ethereum.org/EIPS/eip-3091)
-    pub explorer_url: Option<String>,
     // Instance private key
     pub signing_key: String,
 

src/mastodon_api/instance/types.rs

@@ -1,6 +1,5 @@
-use std::collections::HashMap;
-
 use serde::Serialize;
+use serde_json::{to_value, Value};
 
 use crate::config::Config;
 use crate::ethereum::contracts::ContractSet;
@@ -27,7 +26,7 @@ pub struct InstanceInfo {
     blockchain_explorer_url: Option<String>,
     blockchain_contract_address: Option<String>,
     blockchain_features: Option<BlockchainFeatures>,
-    blockchain_info: Option<HashMap<String, String>>,
+    blockchain_info: Option<Value>,
     ipfs_gateway_url: Option<String>,
 }
 
@@ -49,6 +48,9 @@ impl InstanceInfo {
                 subscription: contract_set.subscription.is_some(),
             }
         });
+        let maybe_blockchain_info = ethereum_config
+            .and_then(|conf| conf.chain_metadata.as_ref())
+            .and_then(|metadata| to_value(metadata).ok());
         Self {
             uri: config.instance().host(),
             title: config.instance_title.clone(),
@@ -61,12 +63,12 @@ impl InstanceInfo {
             blockchain_id: ethereum_config
                 .map(|val| val.chain_id.to_string()),
             blockchain_explorer_url: ethereum_config
-                .and_then(|val| val.explorer_url.clone()),
+                .and_then(|conf| conf.chain_metadata.as_ref())
+                .and_then(|metadata| metadata.explorer_url.clone()),
             blockchain_contract_address: ethereum_config
                 .map(|val| val.contract_address.clone()),
             blockchain_features: blockchain_features,
-            blockchain_info: ethereum_config
-                .and_then(|val| val.chain_info.clone()),
+            blockchain_info: maybe_blockchain_info,
             ipfs_gateway_url: config.ipfs_gateway_url.clone(),
         }
     }