rewrite php session id cookie

flo_middleware.js

var gor = require("goreplay_middleware");

gor.init();

let sessionMap = {};

gor.on("request", function(req) {

    // Don't replay health-checks
    if (gor.httpPath(req.http) != '/ping') {

        let session = gor.httpCookie(req.http, "PHPSESSID");
        // If the session is already in the map, it's been reassigned to the new ID
        // and we'll rewrite the cookie to the new value
        if (session && sessionMap[session]) {
            req.http = gor.setHttpCookie(req.http, "PHPSESSID", sessionMap[session]);
        }

        // Search for the Set-Cookie in the original and replayed response. If found, map the original
        // response PHPSESSID to the replayed response PHPSESSID for all subsequent requests using the cookie
        gor.searchResponses(req.ID, "Set-Cookie: PHPSESSID=(\w+);", function(respSession, replSession) {
            console.error(`'MATCH-FOUND: ${respSession}, ${replSession}'`);
            if (respSession && replSession) {
                sessionMap[respSession] = replSession;
            }
        })

        return req;
    }

})