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Given the constraints and requirements previously expressed in this thread, I don't see much point in using EVAPI for you, nor is there any reason to expect a performance improvement.
You might keep more of your sanity if you just stick to the async_http_client plan. My arguments in favour of EVAPI were rooted in a different set of assumptions about what you're doing and why you're doing it.
-- Alex
> On Jan 9, 2025, at 4:21 am, Sergio Charrua via sr-users <sr-users@lists.kamailio.org> wrote:
>
> Hi Ben!
>
> Be my guest :)
> It is not async HTTP but you can easily modify the script to support async http using python's aiohttp module.
> Please, if you find in the script something relevant to correct or improve, feel free to let me know.
>
> import socket
> import json
> import requests
>
> # Configuration
> REMOTE_HOST = 'KANAILIO_IP' # Replace with the remote service's host/IP
> REMOTE_PORT = 8888 # Replace with the remote service's port
> API_URL = 'THE_URL' # Replace with the actual REST API endpoint
>
> def main():
> # Create a TCP socket
> client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
>
> try:
> # Connect to the remote service
> client_socket.connect((REMOTE_HOST, REMOTE_PORT))
> print(f"Connected to {REMOTE_HOST}:{REMOTE_PORT}")
>
> # Continuously listen for data from the service
> while True:
> # Receive up to 4 KB of data (adjust buffer size as needed)
> data = client_socket.recv(4096)
> strData = data.decode('utf-8')
> strData = strData.strip().rstrip(',')
> # If no data is received, connection is closed or lost
> if not data:
> print("Connection closed by remote service.")
> break
> # Attempt to parse the received data as JSON
> try:
> objJson = json.dumps( strData.replace("<null>","") )
> received_json = json.loads(objJson)
> #print("Received JSON from service:", received_json)
>
> # Forward the JSON to the REST API via POST
> try:
> response = requests.post(API_URL, json=received_json)
> # Check for successful status code
> print("Response from HTTP : " + str(response.status_code))
> if response.status_code == 200:
> # Parse the REST API response as JSON
> response_json = str(response.json())
> print("Received JSON from REST API:", response_json)
>
> # Send the JSON response back to the remote service
> client_socket.sendall((response_json).encode('utf-8'))
> print("Sent response back to service.")
> else:
> # Handle non-200 response
> error_msg = {
> "error": f"REST API returned status code {response.status_code}",
> "details": response.text
> }
> client_socket.sendall(json.dumps(error_msg).encode('utf-8'))
>
> except requests.exceptions.RequestException as req_err:
> # Handle requests exceptions (network errors, timeouts, etc.)
> error_msg = {
> "error": "REST API request failed",
> "details": str(req_err)
> }
> client_socket.sendall(json.dumps(error_msg).encode('utf-8'))
> print("Exception - Sent error message back to service.")
>
> except json.JSONDecodeError as json_err:
> # Handle JSON parsing errors
> error_msg = {
> "error": "Invalid JSON received",
> "details": str(json_err)
> }
> client_socket.sendall(json.dumps(error_msg).encode('utf-8'))
> print("Sent JSON error message back to service.")
>
> except socket.error as sock_err:
> print(f"Socket error: {sock_err}")
> finally:
> # Close the socket connection when done
> client_socket.close()
> print("Socket closed.")
>
> if __name__ == '__main__':
> main()
>
>
> Atenciosamente / Kind Regards / Cordialement / Un saludo,
>
> Sérgio Charrua
>
> On Wed, Jan 8, 2025 at 11:10 PM Ben Kaufman via sr-users <sr-users@lists.kamailio.org> wrote:
> Do you have an example of your python script (or at least a simplified example that reproduces the problem).
>
> Honestly, I tried going down this path as a follow up to the discussions on using http-async the other week, and while I have no doubt there is a performance gain using evapi, I had no success coding an async client (in other words, my client requests to
an http service, etc. were blocking). That's not an indictment of evapi, rather it's the state of my coding ability in other language. I was able to get a simple synchronous example working, but if I couldn't get it to perform better than http_async, there
was no gain.
>
> Kaufman
> Senior Voice Engineer
>
>
>
> E: bkaufman@bcmone.com
>
>
>
>
> SIP.US Client Support: 800.566.9810 | SIPTRUNK Client Support: 800.250.6510 | Flowroute Client Support: 855.356.9768
> Regards,
> Kaufman
>
> From: Sergio Charrua via sr-users <sr-users@lists.kamailio.org>
> Sent: Wednesday, January 8, 2025 11:25 AM
> To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>
> Cc: Sergio Charrua <sergio.charrua@voip.pt>
> Subject: [SR-Users] evapi not processing received messages CAUTION: This email originated from outside the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
>
> Hi all!
>
> I have implemented evapi module on Kamailio 5.8.4, calling a python script.
> Python script is listening to a socket. It receives messages (JSON) from Kamailio, makes an HTTP request somewhere, and sends the response back to Kamailio.
> The Python script is working fine: it connects to Kamailio, sends HTTP requests, and forwards a response back to Kamailio: I have confirmed using TCPDump that, in fact, the data is received and forwarded back.
> However, despite showing messages that the Python client script is correctly connected to Kamailio, the event_route[evapi:message-received] is never executed.
>
> Probably there is some detail that I am missing, but the docs and online info for evapi are very rare, and they all show very similar configuration.
> And as I wrote, I have confirmed using TCPDump that the data is received from Python client script to Kamailio node.
> What am I missing?
>
> This is my Kamailio cfg:
>
> [loads modules]
> [sets modparams]
>
> modparam("evapi","bind_addr","10.20.20.1:8888")
>
> debug=2
> children=16
> log_facility=LOG_LOCAL0
> log_prefix="{$mt $hdr(CSeq) $ci} "
> disable_sctp = yes
> force_rport = yes
> rundir="/tmp"
>
> request_route {
>
> if ( is_method("ACK") ) {
> if ( t_check_trans() ) {
> t_relay();
> }
> exit;
> }
>
> if(is_method("OPTIONS")){
> sl_reply("200", "OK");
> exit;
> }
>
> if(is_method("CANCEL")){
> sl_reply("200","OK");
> sl_reply("487","Request Terminated");
> exit;
> }
>
> route(TOEVAPI);
> exit;
> }
>
> event_route[evapi:connection-new] {
> xlog("LINFO","new connection from [$evapi(srcaddr):$evapi(srcport)]\n");
> if($evapi(srcaddr)!="10.20.0.1") {
> evapi_close();
> exit;
> }
> }
>
> event_route[evapi:connection-closed] {
> xlog("LINFO","connection closed by $evapi(srcaddr):$evapi(srcport)\n");
> }
>
> event_route[evapi:message-received] {
> xlog("LINFO","received [$evapi(msg)] from $evapi(srcaddr):$evapi(srcport)\n");
> jansson_get("t-index", "$evapi(msg)", "$var(t-index)");
> jansson_get("t-label", "$evapi(msg)", "$var(t-label)");
> $var(evmsg) = $evapi(msg);
> xlog("L_INFO", "preparing to resume transaction for processing: $var(tindex) / $var(tlabel)\n");
> t_continue("$var(tindex)", "$var(tlabel)", "EVAPIRESPONSE");
> }
>
> route[EVAPIRESPONSE] {
> xlog("L_INFO", "resumed transaction for processing: $T(id_index) / $T(id_label)\n");
> [do stuff]
> }
>
> route[TOEVAPI]{
>
> xlog("L_INFO", "suspended transaction: $T(id_index) / $T(id_label)\n");
>
> evapi_async_relay( [some JSON string] );
>
> exit;
>
> }
>
>
>
>
> Thanks in advance!
>
> Atenciosamente / Kind Regards / Cordialement / Un saludo,
>
> Sérgio Charrua
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--
Alex Balashov
Principal Consultant
Evariste Systems LLC
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