add premix and browser launcher code

nimbus/launcher.nim

@@ -0,0 +1,40 @@
+import os, osproc, json
+
+when defined(windows):
+  const
+    premixExecutable = "premix.exe"
+    browserLauncher = "cmd /c start"
+elif defined(macos):
+  const
+    premixExecutable = "premix"
+    browserLauncher = "open"
+else:
+  const
+    premixExecutable = "premix"
+    browserLauncher = "xdg-open"
+
+proc getPremixDir(): (bool, string) =
+  var premixDir = [
+    "." ,
+    ".." & DirSep & "premix"
+  ]
+
+  for c in premixDir:
+    if fileExists(c & DirSep & premixExecutable):
+      return (true, c)
+
+  result = (false, ".")
+
+proc launchPremix*(fileName: string, metaData: JsonNode) =
+  let
+    (premixAvailable, premixDir) = getPremixDir()
+    premixExe = premixDir & DirSep & premixExecutable
+
+  writeFile(premixDir & DirSep & fileName, metaData.pretty)
+
+  if premixAvailable:
+    if execCmd(premixExe & " " & premixDir & DirSep & fileName) == 0:
+      if execCmd(browserLauncher & " " & premixDir & DirSep & "index.html") != 0:
+        echo "failed to launch default browser"
+    else:
+      echo "failed to execute premix debugging tool"

nimbus/tracer.nim

@@ -2,7 +2,7 @@ import
   db/[db_chain, state_db, capturedb], eth_common, utils, json,
   constants, vm_state, vm_types, transaction, p2p/executor,
   eth_trie/db, nimcrypto, strutils, ranges, ./utils/addresses,
-  chronicles, rpc/hexstrings
+  chronicles, rpc/hexstrings, launcher
 
 proc getParentHeader(self: BaseChainDB, header: BlockHeader): BlockHeader =
   self.getBlockHeader(header.parentHash)
@@ -230,7 +230,8 @@ proc traceTransactions*(chainDB: BaseChainDB, header: BlockHeader, blockBody: Bl
   for i in 0 ..< blockBody.transactions.len:
     result.add traceTransaction(chainDB, header, blockBody, i, {DisableState})
 
-proc dumpDebuggingMetaData*(chainDB: BaseChainDB, header: BlockHeader, blockBody: BlockBody, receipts: seq[Receipt]) =
+proc dumpDebuggingMetaData*(chainDB: BaseChainDB, header: BlockHeader,
+                            blockBody: BlockBody, receipts: seq[Receipt], launchDebugger = true) =
   let
     blockNumber = header.blockNumber
 
@@ -249,5 +250,9 @@ proc dumpDebuggingMetaData*(chainDB: BaseChainDB, header: BlockHeader, blockBody
   }
 
   metaData.dumpMemoryDB(memoryDB)
-  # this is a placeholder until premix debugging tool is ready
-  writeFile("debug" & $blockNumber & ".json", metaData.pretty())
+
+  let jsonFileName = "debug" & $blockNumber & ".json"
+  if launchDebugger:
+    launchPremix(jsonFileName, metaData)
+  else:
+    writeFile(jsonFileName, metaData.pretty())

premix/dumper.nim

@@ -26,7 +26,7 @@ proc dumpDebug(chainDB: BaseChainDB, blockNumber: Uint256) =
 
   captureChainDB.setHead(parent, true)
   let validationResult = processBlock(captureChainDB, parent, header, body, vmState)
-  dumpDebuggingMetaData(captureChainDB, header, body, vmState.receipts)
+  dumpDebuggingMetaData(captureChainDB, header, body, vmState.receipts, false)
 
 proc main() =
   let conf = getConfiguration()