Make basic Waku v2 examples run again (#123)

* Make basic Waku v2 examples run again

Regression introduced in https://github.com/status-im/nim-waku/pull/117

Happened due to example not being run on CI.

- Add wakuexample to all target
- Fix example2 to run
- Basic formatting

* Update examples/v2/basic2.nim

Co-authored-by: Kim De Mey <kim.demey@gmail.com>

* Update examples/v2/basic2.nim

* Update examples/v2/basic2.nim

* Update examples/v2/basic2.nim

Co-authored-by: Kim De Mey <kim.demey@gmail.com>

Makefile

@@ -47,7 +47,7 @@ GIT_SUBMODULE_UPDATE := git submodule update --init --recursive
 else # "variables.mk" was included. Business as usual until the end of this file.
 
 # default target, because it's the first one that doesn't start with '.'
-all: | wakunode wakusim wakuexample wakunode2 wakusim2
+all: | wakunode wakusim wakuexample wakunode2 wakusim2 wakuexample2
 
 # must be included after the default target
 -include $(BUILD_SYSTEM_DIR)/makefiles/targets.mk

examples/v2/basic2.nim

@@ -1,25 +1,27 @@
-# Here's an example of how you would start a Waku node, subscribe to topics, and
-# publish to them
+## Here's a basic example of how you would start a Waku node, subscribe to
+## topics, and publish to them.
 
-import confutils, chronicles, chronos, os
-
-import stew/shims/net as stewNet
-import libp2p/crypto/crypto
-import libp2p/crypto/secp
-import eth/keys
-import json_rpc/[rpcclient, rpcserver]
-
-import ../../waku/node/v2/config
-import ../../waku/node/v2/wakunode2
-import ../../waku/node/v2/waku_types
-
-# Loads the config in `waku/node/v2/config.nim`
-let conf = WakuNodeConf.load()
+import
+  std/os,
+  confutils, chronicles, chronos,
+  stew/shims/net as stewNet,
+  libp2p/crypto/[crypto,secp],
+  eth/keys,
+  json_rpc/[rpcclient, rpcserver],
+  ../../waku/node/v2/[config, wakunode2, waku_types],
+  ../../waku/node/common
 
 # Node operations happens asynchronously
-proc runBackground(conf: WakuNodeConf) {.async.} =
-  # Create and start the node
-  let node = await WakuNode.init(conf)
+proc runBackground() {.async.} =
+  let
+    conf = WakuNodeConf.load()
+    (extIp, extTcpPort, extUdpPort) = setupNat(conf.nat, clientId,
+      Port(uint16(conf.tcpPort) + conf.portsShift),
+      Port(uint16(conf.udpPort) + conf.portsShift))
+    node = WakuNode.init(conf.nodeKey, conf.libp2pAddress,
+      Port(uint16(conf.tcpPort) + conf.portsShift), extIp, extTcpPort)
+
+  await node.start()
 
   # Subscribe to a topic
   let topic = "foobar"
@@ -31,6 +33,7 @@ proc runBackground(conf: WakuNodeConf) {.async.} =
   let message = cast[seq[byte]]("hello world")
   node.publish(topic, message)
 
-discard runBackground(conf)
+# TODO Await with try/except here
+discard runBackground()
 
 runForever()

waku/node/v2/wakunode2.nim

@@ -30,7 +30,7 @@ type
   HistoryResponse* = object
     messages*: seq[Message]
 
-const clientId = "Nimbus Waku v2 node"
+const clientId* = "Nimbus Waku v2 node"
 
 # NOTE Any difference here in Waku vs Eth2?
 # E.g. Devp2p/Libp2p support, etc.