[tarantool-patches] [PATCH 2/5] box/console: Add explicit output EOS mapping
Cyrill Gorcunov
gorcunov at gmail.com
Sat Aug 31 00:48:05 MSK 2019
This will help us to distinguish end of string/stream
in text protocols (such as remote console connection).
Note that we start printing ";" terminator for every
lua output. Actually current yaml output does the
same but inside console.c module.
And since lua output is yet a new feature in stabilization
phase we're safe to make such changes without breaking api.
Part-of #3834
---
src/box/lua/console.lua | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/src/box/lua/console.lua b/src/box/lua/console.lua
index 6cbb6b405..5ca5cad1f 100644
--- a/src/box/lua/console.lua
+++ b/src/box/lua/console.lua
@@ -11,6 +11,7 @@ local urilib = require('uri')
local yaml = require('yaml')
local net_box = require('net.box')
+local LUA_TERM = ';'
local YAML_TERM = '\n...\n'
local PUSH_TAG_HANDLE = '!push!'
@@ -19,6 +20,10 @@ local PUSH_TAG_HANDLE = '!push!'
-- compatibility reason.
local default_output_format = { ["fmt"] = "yaml", ["opts"] = nil }
local output_handlers = { }
+--
+-- End of streams/strings. They will allow to recognize blocks
+-- depending on output format.
+local output_eos = { ["yaml"] = YAML_TERM, ["lua"] = LUA_TERM }
output_handlers["yaml"] = function(status, opts, ...)
local err
@@ -42,9 +47,11 @@ end
output_handlers["lua"] = function(status, opts, ...)
--
- -- Don't print nil if there is no data
+ -- If no data present at least EOS should be put,
+ -- otherwise wire readers won't be able to find
+ -- where end of string is.
if not ... then
- return ""
+ return output_eos["lua"]
end
-- Map internal symbols in case if they are
-- not inside tables and serpent won't handle
@@ -75,9 +82,9 @@ output_handlers["lua"] = function(status, opts, ...)
nocode = true,
}
if opts == "block" then
- return serpent.block(..., serpent_opts)
+ return serpent.block(..., serpent_opts) .. output_eos["lua"]
end
- return serpent.line(..., serpent_opts)
+ return serpent.line(..., serpent_opts) .. output_eos["lua"]
end
local function output_verify_opts(fmt, opts)
--
2.20.1
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