[PATCH 8/8] netbox: implement perform_request via async version

[Vladislav Shpilevoy <v.shpilevoy@tarantool.org>]

When async netbox was introduced, it is not needed to hold a
special sync implementation - it can be just async call + waiting
for a response.

Closes #3107
---
 src/box/lua/net_box.lua | 26 +++++++++-----------------
 1 file changed, 9 insertions(+), 17 deletions(-)

diff --git a/src/box/lua/net_box.lua b/src/box/lua/net_box.lua
index a2b7b39d2..6b33f70c7 100644
--- a/src/box/lua/net_box.lua
+++ b/src/box/lua/net_box.lua
@@ -437,24 +437,16 @@ local function create_transport(host, port, user, password, callback,
 
     --
     -- Send a request and wait for response.
+    -- @retval nil, error Error occured.
+    -- @retval not nil Response object.
     --
     local function perform_request(timeout, buffer, method, ...)
         local request, err =
             perform_async_request(buffer, method, ...)
         if not request then
-            return last_errno or E_NO_CONNECTION, last_error
+            return nil, err
         end
-        request.client = fiber_self()
-        local id = request.id
-        local deadline = fiber_clock() + (timeout or TIMEOUT_INFINITY)
-        repeat
-            local timeout = max(0, deadline - fiber_clock())
-            if not state_cond:wait(timeout) then
-                requests[id] = nil
-                return E_TIMEOUT, 'Timeout exceeded'
-            end
-        until requests[id] == nil -- i.e. completed (beware spurious wakeups)
-        return request.errno, request.response
+        return request:wait_result(timeout)
     end
 
     local function dispatch_response_iproto(hdr, body_rpos, body_end)
@@ -988,9 +980,9 @@ function remote_methods:_request(method, opts, ...)
         transport.wait_state('active', timeout)
         timeout = deadline and max(0, deadline - fiber_clock())
     end
-    local err, res = transport.perform_request(timeout, buffer, method, ...)
+    local res, err = transport.perform_request(timeout, buffer, method, ...)
     if err then
-        box.error({code = err, reason = res})
+        box.error.raise(err)
     end
     -- Try to wait until a schema is reloaded if needed.
     -- Regardless of reloading result, the main response is
@@ -1182,13 +1174,13 @@ function console_methods:eval(line, timeout)
     end
     if self.protocol == 'Binary' then
         local loader = 'return require("console").eval(...)'
-        err, res = pr(timeout, nil, 'eval', loader, {line})
+        res, err = pr(timeout, nil, 'eval', loader, {line})
     else
         assert(self.protocol == 'Lua console')
-        err, res = pr(timeout, nil, 'inject', line..'$EOF$\n')
+        res, err = pr(timeout, nil, 'inject', line..'$EOF$\n')
     end
     if err then
-        box.error({code = err, reason = res})
+        box.error.raise(err)
     end
     return res[1] or res
 end
-- 
2.15.1 (Apple Git-101)