Provide rpc api for other mods

ew_api_example/module.lua

@@ -1,8 +1,24 @@
+local ew_api = dofile_once("mods/quant.ew/files/api/ew_api.lua")
+
+-- Needs a unique, but preferably short identifier.
+local rpc = ew_api.new_rpc_namespace("api_example")
+
+-- Make the next rpc be delivered reliably.
+-- This means that it will be called exactly once (unless a disconnection happens), and will be ordered the same way.
+-- E. g. if you call rpc.rpc1(), rpc.rpc1(), rpc.rpc2() that are reliable, they will get called in the same order on other clients.
+rpc.opts_reliable()
+-- This rpc will also get called locally.
+rpc.opts_everywhere()
+function rpc.send_hi()
+    GamePrint("Hi from "..ew_api.rpc_player_data().name)
+end
+
 local module = {}
 
 function module.on_world_update()
     if GameGetFrameNum() % 60 == 0 then
         GamePrint("Hi from api example!")
+        rpc.send_hi()
     end
 end
 

quant.ew/files/api/ew_api.lua

@@ -0,0 +1,11 @@
+local ew_api = {}
+
+-- Creates an rpc namespace. See ew_api_example for how to use it.
+ew_api.new_rpc_namespace = net.new_rpc_namespace_with_id
+
+-- In rpc, returns player_data of a peer who called that rpc.
+function ew_api.rpc_player_data()
+    return ctx.rpc_player_data
+end
+
+return ew_api

quant.ew/files/core/net.lua

@@ -67,6 +67,11 @@ local rpc_meta = {
   __newindex = function (t, k, v)
       table.insert(rpc_inner.rpcs, v)
       local index = #rpc_inner.rpcs
+      if t._ew_id ~= nil then
+        index = t._ew_id..t._ew_index
+        t._ew_index = t._ew_index + 1
+        print("Created API rpc: "..index)
+      end
       local reliable = rpc_inner.opts.reliable == true
       local everywhere = rpc_inner.opts.everywhere == true
       rawset(t, k, function(...)
@@ -97,6 +102,14 @@ function net.new_rpc_namespace()
   return ret
 end
 
+function net.new_rpc_namespace_with_id(id)
+  local ret = {}
+  ret._ew_id = id
+  ret._ew_index = 0
+  setmetatable(ret, rpc_meta)
+  return ret
+end
+
 function net.init()
     local ready = false
     local addr = os.getenv("NP_NOITA_ADDR") or "127.0.0.1:21251"