Fix #1784; Handle Infura HTTPS URLs

beacon_chain/eth1_monitor.nim

@@ -90,6 +90,38 @@ template depositContractAddress(m: Eth1Monitor): Eth1Address =
 template web3Url(m: Eth1Monitor): string =
   m.dataProvider.url
 
+proc fixupInfuraUrls*(web3Url: var string) =
+  ## Converts HTTP and HTTPS Infura URLs to their WebSocket equivalents
+  ## because we are missing a functional HTTPS client.
+  let normalizedUrl = toLowerAscii(web3Url)
+  var pos = 0
+
+  template skip(x: string): bool =
+    if normalizedUrl.len - pos >= x.len and
+       normalizedUrl.toOpenArray(pos, pos + x.len - 1) == x:
+      pos += x.len
+      true
+    else:
+      false
+
+  if not (skip("https://") or skip("http://")):
+    return
+
+  let
+    isMainnet = skip("mainnet")
+    isGoerli = skip("goerli")
+
+  if not (isMainnet or isGoerli):
+    return
+
+  if not skip(".infura.io/v3/"):
+    return
+
+  template infuraKey: string = normalizedUrl.substr(pos)
+
+  web3Url = "wss://" & (if isMainnet: "mainnet" else: "goerli") &
+            ".infura.io/ws/v3/" & infuraKey
+
 # TODO: Add preset validation
 # MIN_GENESIS_ACTIVE_VALIDATOR_COUNT should be larger than SLOTS_PER_EPOCH
 #  doAssert SECONDS_PER_ETH1_BLOCK * preset.ETH1_FOLLOW_DISTANCE < GENESIS_DELAY,
@@ -357,6 +389,9 @@ proc init*(T: type Eth1Monitor,
            web3Url: string,
            depositContractAddress: Eth1Address,
            depositContractDeployedAt: string): Future[Result[T, string]] {.async.} =
+  var web3Url = web3Url
+  fixupInfuraUrls web3Url
+
   let web3 = try: await newWeb3(web3Url)
              except CatchableError as err:
                debugEcho err.msg

tests/test_eth1_monitor.nim

@@ -8,5 +8,33 @@ import
 suite "Eth1 Chain":
   discard
 
-suite "Mainchain monitor":
-  discard
+suite "Eth1 monitor":
+  test "Rewrite HTTPS Infura URLs":
+    var
+      mainnetWssUrl = "wss://mainnet.infura.io/ws/v3/6224f3c792cc443fafb64e70a98f871e"
+      mainnetHttpUrl = "http://mainnet.infura.io/v3/6224f3c792cc443fafb64e70a98f871e"
+      mainnetHttpsUrl = "https://mainnet.infura.io/v3/6224f3c792cc443fafb64e70a98f871e"
+      goerliWssUrl = "wss://goerli.infura.io/ws/v3/6224f3c792cc443fafb64e70a98f871e"
+      goerliHttpUrl = "http://goerli.infura.io/v3/6224f3c792cc443fafb64e70a98f871e"
+      goerliHttpsUrl = "https://goerli.infura.io/v3/6224f3c792cc443fafb64e70a98f871e"
+      gethUrl = "ws://localhost:8545"
+
+    fixupInfuraUrls mainnetWssUrl
+    fixupInfuraUrls mainnetHttpUrl
+    fixupInfuraUrls mainnetHttpsUrl
+    fixupInfuraUrls goerliWssUrl
+    fixupInfuraUrls goerliHttpUrl
+    fixupInfuraUrls goerliHttpsUrl
+    fixupInfuraUrls gethUrl
+
+    check:
+      mainnetWssUrl == "wss://mainnet.infura.io/ws/v3/6224f3c792cc443fafb64e70a98f871e"
+      mainnetHttpUrl == mainnetWssUrl
+      mainnetHttpsUrl == mainnetWssUrl
+
+      goerliWssUrl == "wss://goerli.infura.io/ws/v3/6224f3c792cc443fafb64e70a98f871e"
+      goerliHttpUrl == goerliWssUrl
+      goerliHttpsUrl == goerliWssUrl
+
+      gethUrl == "ws://localhost:8545"
+