Add a wrapper call.any() for vshard's replicaset:call()

Add a new wrapper for replicaset:call() that will be used in
_fetch_on_router().

Part of #166

Reviewed-by: Alexander Turenko <alexander.turenko@tarantool.org>

crud/common/call.lua

@@ -145,4 +145,31 @@ function call.single(bucket_id, func_name, func_args, opts)
     return res
 end
 
+function call.any(func_name, func_args, opts)
+    dev_checks('string', '?table', {
+        timeout = '?number',
+    })
+
+    local timeout = opts.timeout or call.DEFAULT_VSHARD_CALL_TIMEOUT
+
+    local replicasets, err = vshard.router.routeall()
+    if replicasets == nil then
+        return nil, CallError:new("Failed to get all replicasets: %s", err.err)
+    end
+    local replicaset = select(2, next(replicasets))
+
+    local res, err = replicaset:call(func_name, func_args, {
+        timeout = timeout,
+    })
+    if err ~= nil then
+        return nil, wrap_vshard_err(err, func_name, replicaset.uuid)
+    end
+
+    if res == box.NULL then
+        return nil
+    end
+
+    return res
+end
+
 return call

test/unit/call_test.lua

@@ -225,3 +225,32 @@ g.test_map_vshard_calls = function()
         mode = 'read', prefer_replica = true, balance = true,
     })
 end
+
+g.test_any_vshard_call = function()
+    g.clear_vshard_calls()
+    local results, err = g.cluster.main_server.net_box:eval([[
+        local call = require('crud.common.call')
+        return call.any('say_hi_politely', {'dude'}, {})
+    ]])
+
+    t.assert_equals(results, 'HI, dude! I am s2-master')
+    t.assert_equals(err, nil)
+end
+
+g.test_any_vshard_call_timeout = function()
+    local timeout = 0.2
+
+    local results, err = g.cluster.main_server.net_box:eval([[
+        local call = require('crud.common.call')
+
+        local say_hi_timeout, call_timeout = ...
+
+        return call.any('say_hi_sleepily', {say_hi_timeout}, {
+            timeout = call_timeout,
+        })
+    ]], {timeout + 0.1, timeout})
+
+    t.assert_equals(results, nil)
+    t.assert_str_contains(err.err, "Failed for %w+%-0000%-0000%-0000%-000000000000", true)
+    t.assert_str_contains(err.err, "Timeout exceeded")
+end