Use chronos http server for dcli metrics and remove insecure compile flag (#343)

And add cfg file to default have runtime log filtering on

doc/discv5.md

@@ -98,11 +98,9 @@ nim c -d:chronicles_log_level:trace -d:release --threads:on eth/p2p/discoveryv5/
 ```
 
 ### Metrics
-To compile in an HTTP endpoint for accessing the metrics add the `insecure`
-compile time flag:
+To run dcli with metrics enabled provide the `metrics` flag:
+
 ```sh
-# Build dcli with metrics
-nim c -d:insecure -d:chronicles_log_level:trace -d:release --threads:on eth/p2p/discoveryv5/dcli
 # Run dcli with metrics
 ./eth/p2p/discoveryv5/dcli --metrics --bootnode:enr:<base64 encoding of ENR>
 ```

eth/p2p/discoveryv5/dcli.nim

@@ -1,8 +1,9 @@
 import
-  std/[options, strutils],
-  chronos, chronicles, chronicles/topics_registry, confutils, metrics,
-  stew/byteutils, confutils/std/net,
-  eth/keys, eth/net/nat, enr, node, protocol
+  std/[options, strutils, tables],
+  confutils, confutils/std/net, chronicles, chronicles/topics_registry,
+  chronos, metrics, metrics/chronos_httpserver, stew/byteutils,
+  ../../keys, ../../net/nat,
+  ./enr, ./node, ./protocol
 
 type
   DiscoveryCmd* = enum
@@ -124,7 +125,7 @@ proc completeCmdArg*(T: type Node, val: TaintedString): seq[string] =
 proc parseCmdArg*(T: type PrivateKey, p: TaintedString): T =
   try:
     result = PrivateKey.fromHex(string(p)).tryGet()
-  except CatchableError as e:
+  except CatchableError:
     raise newException(ConfigurationError, "Invalid private key")
 
 proc completeCmdArg*(T: type PrivateKey, val: TaintedString): seq[string] =
@@ -152,13 +153,16 @@ proc run(config: DiscoveryConf) =
 
   d.open()
 
-  when defined(insecure):
   if config.metricsEnabled:
     let
       address = config.metricsAddress
       port = config.metricsPort
-      info "Starting metrics HTTP server", address, port
-      metrics.startHttpServer($address, port)
+    notice "Starting metrics HTTP server",
+      url = "http://" & $address & ":" & $port & "/metrics"
+    try:
+      chronos_httpserver.startMetricsHttpServer($address, port)
+    except CatchableError as exc: raise exc
+    except Exception as exc: raiseAssert exc.msg # TODO fix metrics
 
   case config.cmd
   of ping:
@@ -188,7 +192,6 @@ proc run(config: DiscoveryConf) =
 when isMainModule:
   let config = DiscoveryConf.load()
 
-  if config.logLevel != LogLevel.NONE:
   setLogLevel(config.logLevel)
 
   run(config)

eth/p2p/discoveryv5/dcli.nim.cfg

@@ -0,0 +1 @@
+-d:"chronicles_runtime_filtering=on"