https://forum.defold.com/t/coroutines-and-sync-http-requests/66387
Please suggest a solution to the problem.
Why is the example not working?
defold 1.3.4
Please post text, and not screen shots. It is a lot easier for us to read, and search through and also test.
sorry, my mistake
i’m get it from this post
local function http_request(url, method)
local co = coroutine.running()
http.request("http://d.defold.com/stable/info.json", "GET", function(self, id, response)
print('result is fetched')
coroutine.resume(co, response)
end)
return coroutine.yield()
end
local co = coroutine.create(function()
print('request is executed')
local response = http_request("http://d.defold.com/stable/info.json", "GET")
print('should not be executed before fetched result')
end)
local ok, err = coroutine.resume(co)
why do I need it
global_["host_name"] = {'http://127.0.0.1', 'http://127.0.0.1:2347'}
function load_init_callback(self, _, response)
pprint(response)
end
for key, value in pairs(global_.host_name) do
http.request(value .. '/?action=' .. global_.init_url, "POST", load_init_callback, global_.header, '')
end
but i cant get the table index for responded server
i have alvays 2 because request is async
1 Like
It looks like you are creating and running that coroutine outside of the lifecycle functions. This will not work. You need to create and start the coroutine from init, on_input or similar function.
I’m not really sure what it is you wish to do? Could you please explain what you want to achieve?
Thank you. try in initialization
Let’s say there are several servers.
The client will connect to the first working server
but I can’t find its index in the address table
thank you very much)) everything works. I will put the value of the key in the loop into a global variable and will use it in other queries
http.request(global_.host_name[key], method)
since we already know the address of the working server)))
global_ = {}
global_["host_name"] = {'http://127.0.0.1:2347', 'http://127.0.0.1'}
local function http_request(url, method)
local co = coroutine.running()
http.request(url, method, function(self, id, response)
print('result is fetched')
coroutine.resume(co, response)
end)
return coroutine.yield()
end
function init(self)
for key, value in pairs(global_.host_name) do
local key = coroutine.create(function()
print('request is executed')
local response = http_request(value, "GET")
pprint(response)
pprint(key)
print('should not be executed before fetched result')
end)
local ok, err = coroutine.resume(key)
end
end
You are creating one coroutine for each iteration of the loop. If you want to try the servers one after the other then create one coroutine outside of the for-loop.
1 Like
How to do it? I do not understand
please 
local co = coroutine.create(function()
for key, value in pairs(global_.host_name) do
print('request is executed')
local response = http_request(value, "GET")
pprint(response)
pprint(key)
print('should not be executed before fetched result')
end
end)
local ok, err = coroutine.resume(co)
it`s right answer?
Yes, that is right. Did you try it yourself? You should see it do one http request, wait for the response, and then do the next one.
With your previous solution you did both at the same time.
I recommend that you try things yourself, add logging or use the debugger, and check if results are as you expect them to be.
