feat: add support to CELO providers

Author: guidiaz

README.md

@@ -19,20 +19,22 @@ The repository also provides:
 
 `WitnetProxy` is an upgradable delegate-proxy contract that routes Witnet Data Requests coming from a `UsingWitnet`-inheriting contract to a currently active `WitnetRequestBoard` implementation. 
 
-The following table contains all the `WinetProxy` instances that act as entry-points for the latest versions of the `WitnetRequestBoard` approved and deployed by the [**Witnet Foundation**](https://witnet.foundation), and that actually integrates with the **Witnet mainnet** from the currently supported EVM-compatible blockchains.
+The following table contains the addresses that point to the the latest deployed versions of the `WitnetRequestBoard`, approved by the [**Witnet Foundation**](https://witnet.foundation), and that actually integrates with the **Witnet mainnet** from the currently supported EVM-compatible blockchains.
 
-  | Blockchain   | Network   | `WitnetProxy` |
-  | ------------ | --------- | :-----------: |
-  | **Ethereum** | Rinkeby   | `0x6cE42a35C61ccfb42907EEE57eDF14Bb69C7fEF4` 
-  |              | Göerli    | `0xb58D05247d16b3F1BD6B59c52f7f61fFef02BeC8` 
-  |              | Mainnet   | `` 
+  | Chain        | Network   | Entrypoint address | Version tag 
+  | ------------ | --------- | :----------------- | :----------
+  | **Ethereum** | Rinkeby   | `0x6cE42a35C61ccfb42907EEE57eDF14Bb69C7fEF4` | `0.4.2-trustable`
+  |              | Göerli    | `0xb58D05247d16b3F1BD6B59c52f7f61fFef02BeC8` | `0.4.2-trustable`
+  |              | Mainnet   | |
   | ------------ | --------- | ---------------------
-  | **Conflux**  | Testnet   | `cfxtest:acfnpy71hjhamy075xyps56124zje5154ux9nte7vt` 
-  |              | Mainnet   | `` 
+  | **Conflux**  | Testnet   | `cfxtest:acfnpy71hjhamy075xyps56124zje5154ux9nte7vt` | `0.4.2-trustable`
+  |              | Mainnet   | | 
   | ------------ | --------- | ---------------------
-  | **BOBA.L2**  | Rinkeby   | `0xA2F4f5290F9cfD3a17Cfa82f2a2fD3E5c05d1442` 
-  |              | Mainnet   | `` 
+  | **BOBA.L2**  | Rinkeby   | `0xA2F4f5290F9cfD3a17Cfa82f2a2fD3E5c05d1442`  | `0.4.2-trustable-boba`
+  |              | Mainnet   | | 
   | ------------ | --------- | ---------------------
+  | **CELO**     | Alfajores | `0x8e0F6f18DA49e548eBf845aFb6Ca98d43CBc8744`  | `0.4.2-trustable`
+  |              | Mainnet   | |   
 
 ## **IWitnetRequest**
 

contracts/impls/WitnetProxy.sol

@@ -7,15 +7,14 @@ import "../patterns/Upgradable.sol";
 
 /// @title WitnetProxy: upgradable delegate-proxy contract that routes Witnet data requests coming from a 
 /// `UsingWitnet`-inheriting contract to a currently active `WitnetRequestBoard` implementation. 
-/// https://github.com/witnet/witnet-ethereum-bridge/tree/0.3.x
 /// @author The Witnet Foundation.
 contract WitnetProxy {
 
     struct WitnetProxySlot {
         address implementation;
     }
 
-    /// Event emitted when a new DR is posted.
+    /// Event emitted every time the implementation gets updated.
     event Upgraded(address indexed implementation);  
 
     /// Constructor with no params as to ease eventual support of Singleton pattern (i.e. ERC-2470).

migrations/scripts/1_deploy_wrb.js

@@ -1,11 +1,14 @@
 const { merge } = require("lodash")
 
-const realm = process.env.WITNET_EVM_REALM ? process.env.WITNET_EVM_REALM.toLowerCase() : "default"
 const settings = require("../witnet.settings")
-const artifactsName = merge(settings.artifacts.default, settings.artifacts[realm])
 
 module.exports = async function (deployer, network, accounts) {
-  const addresses = require("../witnet.addresses")[realm][network.split("-")[0]]
+  const realm = network === "test"
+    ? "default"
+    : process.env.WITNET_EVM_REALM ? process.env.WITNET_EVM_REALM.toLowerCase() : "default"
+
+  const addresses = require("../witnet.addresses")[realm][network = network.split("-")[0]]
+  const artifactsName = merge(settings.artifacts.default, settings.artifacts[realm])
 
   let WitnetParserLib, WitnetDecoderLib
   let WitnetProxy, WitnetRequestBoard

migrations/witnet.addresses.json

@@ -36,5 +36,11 @@
       "WitnetParserLib": "",
       "WitnetRequestBoard": ""
     }
+  },
+  "celo": {
+    "celo.alfajores": {
+      "WitnetParserLib": "0x1C402c521C8dbF8aCF769d8445dC69c09E3505a5",
+      "WitnetRequestBoard": "0x8e0F6f18DA49e548eBf845aFb6Ca98d43CBc8744"
+    }
   }
 }

migrations/witnet.settings.js

@@ -54,6 +54,11 @@ module.exports = {
         version: "./node_modules/@eth-optimism/solc",
       },
     },
+    celo: {
+      solc: {
+        version: "0.8.7",
+      },
+    },
   },
   networks: {
     default: {
@@ -112,6 +117,14 @@ module.exports = {
         skipDryRun: true,
       },
     },
+    celo: {
+      "celo.alfajores": {
+        network_id: 44787,
+        host: "localhost",
+        port: 8538,
+        skipDryRun: true,
+      },
+    },
   },
 }
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "witnet-ethereum-bridge",
-  "version": "0.4.2",
+  "version": "0.4.3",
   "description": "Witnet Bridge Solidity contracts for EVM-compatible networks",
   "main": "",
   "scripts": {