I am using lua as module for nginx (openresty) to get files from remote host. My function:
function readfile(url)
local http = require ("socket.http")
if not http then
error("Couldn't open socket.http")
end
http.TIMEOUT = 5
local body, code = http.request(url)
if not body then
error("Couldn't read the remote file: " .. code)
end
return body
end
I have tested this code by using Siege. When I set the users more then 100 (for example), I catch this error:
2018/03/27 09:36:38 [info] 10#10: *91018 shutdown() failed (107: Socket not connected), client: 172.18.0.7, server: localhost
I have more errors when i set more users. What does it mean? Thank you for the help.
Don't use luasocket library with OpenResty. The resulting code would block on http.request().
I suppose that all nginx worker just blocked and it is the reason of these errors.
For you purpose you may use one of the libraries below:
lua-resty-http
lua-resty-http-simple
First is more fexible, allow to use secure transport.
Second has simpler API.
And both use internally nginx Lua cosocket API and are 100% nonblocking out of the box.
The lua-resty-http or lua-resty-http-simple do not work in the init_by_lua in http context.
it is fine to use it in the init context where blocking is not considered harmful.
Related
I have the Telit LE920-EUG 4G LTE module. I am trying to execute GET and POST http requests to a remote server. Though the PDP context is activating properly and I have internet access on the SIM that I'm using, I can't seem to be able to connect to a remote server and execute HTTP requests (both POST and GET) from the module.
I have tried two ways, one through direct HTTP commands supported by the module(All commands mentioned in the LE9x0 AT command reference guide), the commands sequence for which is mentioned below, but +CME ERROR: 100 occurs, and it's same for every http command(AT#HHTPQRY, AT#HTTPRCV) that I try to execute.
AT#SGACT=1,1
#SGACT: 31.81.208.1
OK
AT#HTTPCFG=0,"httpbin.org",80,0,,,0,120,1
+CME ERROR: 100
//No configuration details
AT#HTTPCFG?
+CME ERROR: 100
AT#HTTPCFG=?
+CME ERROR: 100
I have also tried the GET and POST commands after socket dialing. The socket connects but they are not receiving any data from the server or posting anything onto the server, the connection closes with a NO CARRIER. The command sequence that I'm using is given below
//Socket Dial
AT#SD=1,0,80,www.m2msupport.net
CONNECT
//GET commands sequence
GET /m2msupport/http_get_test.php HTTP/1.1
Host:www.m2msupport.net
Connection:keep-alive
//Connection closes with No Response
NO CARRIER
//Socket info shows the bytes sent
at#si=1
#SI: 1,86,0,0,0
OK
I am trying to send the mail through jmeter for failed http request, I want to know the sampler details like name of http request?
I have added if controller to check the assertion of previously running request sand send a mail if it fails.It gives me error message
"Message from Jmeter thread # Test failed: code expected to match /200/"
But I want to know the name of http request which has been failed so i can know specifically which request is failing?
You can use JSR223 PreProcessor to get the previous sampler details using the following code:
def sampler = ctx.getPreviousSampler()
Example usage:
def previousSamplerName = ctx.getPreviousSampler().getName()
log.info("Failed sampler name: " + previousSamplerName)
vars.put("SamplerName", previousSamplerName)
Demo:
If everything goes fine you will be able to access previous sampler name as ${SamplerName} in the SMTP Request sampler
ctx is a shorthand to JMeterContext class instance, see the JavaDoc for available methods and fields
vars is a shorthand to JMeterVariables class instance, it provides read/write access to all JMeter Variables in scope.
Also check out Groovy Is the New Black guide to get familiarized with using Groovy in JMeter tests.
I am doing a project that is related with creating TCP/IP communication in Lua language. My computer is going to be a server and I wanna connect it with another computer.
So, here is the code:
local socket = require'socket'
local server = socket.tcp()
server:bind('*', 7200)
server:listen(32)
>>>>local client = server:accept()
--Here I have a problem. It is not working.
--It says:
--calling 'accept' on bad self (tcp{server} expected,got userdata in function)
client:settimeout(10)
-- receive the line
local line, err = client:receive()
-- if there was no error, send it back to the client
if not err then
client:send('test') --end
-- done with client, close the object
client:close()
Where did I make a mistake?
Your code works: If I add an end at the bottom of your code it works for me.
I'm trying to make a http get, using Lua Socket:
local client = socket.connect('warm-harbor-2019.herokuapp.com',80)
if client then
client:send("GET /get_tweets HTTP/1.0\r\n\r\n")
s, status, partial = client:receive(1024)
end
end
I expect s to be a tweet, since the get that I'm making returns one.
But I'm getting:
http/1.1 404 object not found
Here is a runnable version of your code example (that exhibit the problem you described):
local socket = require "socket"
local client = socket.connect('warm-harbor-2019.herokuapp.com',80)
if client then
client:send("GET /get_tweets HTTP/1.0\r\n\r\n")
local s, status, partial = client:receive(1024)
print(s)
end
If you read the error page returned, you can see that its title is Heroku | No such app.
The reason for that is that the Heroku router only works when a Host header is provided. The easiest way to do it is to use the actual HTTP module of LuaSocket instead of TCP directly:
local http = require "socket.http"
local s, status, headers = http.request("http://warm-harbor-2019.herokuapp.com/get_tweets")
print(s)
If you cannot use socket.http you can pass the Host header manually:
local socket = require "socket"
local client = socket.connect('warm-harbor-2019.herokuapp.com',80)
client:send("GET /get_tweets HTTP/1.0\r\nHost: warm-harbor-2019.herokuapp.com\r\n\r\n")
local s, status, partial = client:receive(1024)
print(s, status, partial)
With my version of LuaSocket, s will be nil, status will be "closed" and partial will contain the full HTTP response (with headers etc).
I'm attempting to create a Sinatra server that will return statistics about an EventMachine server. That is, I'm running:
EventMachine.run do
server = EventMachine.start_server 'localhost', 3333, MyApp
dispatch = Rack::Builder.app do
map '/' do
run MySinatraApp
end
end
Rack::Server.start({
app: dispatch,
server: 'thin',
Host: '0.0.0.0',
Port: '1111'
})
end
My goal is to figure out information on that running server started by start_server, such as connection_count. Is there any way to do this?
As far as I know there is no in-built way to do this (hopefully someone disproves me),
you can keep a counter in MyApp and +1 on connect and -1 on unbind for same effect.
Why? Why not just have the EM server provide a /info endpoint or something that returns a dump of the information you need? Why do you need the second server? If you really want a second server then it could just be a simple sinatra app that makes a HTTP request to /info and returns the results.
For connection_count it looks like there is a EM.connection_count you can call. You can see it here.