Lightstreamer 新手：我应该如何解释这个 Web 请求？

Posted 2023-03-31

【中文标题】Lightstreamer 新手：我应该如何解释这个 Web 请求？

【英文标题】：New to Lightstreamer: how should I interpret this web request?

【发布时间】：2021-05-30 03:19:19

【问题描述】：

我试图理解为什么 Lightstreamer 会将此作为第一条消息发送（我期待 json 或类似的东西，但它似乎是 javascript）

请求：

响应似乎是一种 Javascript。比如 LS_window.LS_e 函数是 Lightstreamer 原生的？

HTTP/1.1 200 OK
server: Lightstreamer-Server/7.1.1
content-type: text/javascript; charset=ISO-8859-1
cache-control: no-store
cache-control: no-transform
cache-control: no-cache
pragma: no-cache
access-control-allow-credentials: true
x-accel-buffering: no

var myEnv = lsc;
var phase = null;
function setPhase(ph) 
 phase = ph;


function start(sID, addr, kaMs, reqLim, srv, ip) 
 LS_window.LS_e(1, phase, sID, addr, kaMs, reqLim, srv, ip);


function loop(holdMs) 
 LS_window.LS_e(2, phase, holdMs);

setPhase(2501);start('*****', null, 0, 150000, 'HTTP Server', '*****');loop(0);

以下交换的数据是 Lightstreamer 的原生数据，还是我正在监控的这个应用程序特有的数据？

bind_session
LS_session=*****&LS_phase=2503&LS_cause=loop1&LS_keepalive_millis=5000&LS_container=lsc&

---

var myEnv = lsc;
var phase = null;
function setPhase(ph) 
 phase = ph;


var winPhase = ;
function setWin(tbl, ph) 
 winPhase[tbl] = ph;


var clsd = false;
function c(cod, ph, tbl, its, flds, key, com) 
 LS_window.LS_w(cod, ph, tbl, its, flds, key, com);


function error(cod, ph, tbl, msg) 
 if (tbl != null) 
  LS_window.LS_l(cod, ph, tbl, msg);
  else 
  LS_window.LS_l(cod, phase, null, msg);
 


function start(sID, addr, kaMs, reqLim, srv, ip) 
 LS_window.LS_e(1, phase, sID, addr, kaMs, reqLim, srv, ip);


function end(cause) 
 LS_window.LS_e(4, phase, cause);


function loop(holdMs) 
 LS_window.LS_e(2, phase, holdMs);


function retry() 
 LS_window.LS_e(3, phase);


function s0() 

function bw(maxBW) 
 LS_window.LS_e(5, phase, maxBW);


function y(secs) 
 LS_window.LS_s(phase, secs);


var unchangedSignal = ;
unchangedSignal.length = -1;
function convert(b, f) 
  var a, c, d = f, e = [];
  for(a = 0;a < b.length;a++) 
    if(a < f) 
      e[a] = b[a]
     else 
      if(b[a].charAt) 
        b[a] == '$' ? e[d] = '' : b[a] == '#' ? e[d] = null : (c = b[a].charAt(0), e[d] = c == '$' || c == '#' ? b[a].substring(1) : b[a]), d++
       else 
        for(c = 0;c < b[a];c++) 
          e[d] = unchangedSignal, d++
        
      
    
  
  return e;

function d(tbl) 
 try  LS_window.LS_u(winPhase[tbl], convert(arguments || d.arguments, 2));  catch(exc) 

function z(tbl) 
 LS_window.LS_v(winPhase[tbl], convert(arguments || z.arguments, 2));

function n(tbl) 
 LS_window.LS_n(winPhase[tbl], arguments || n.arguments);

function s(tbl) 
 LS_window.LS_s(winPhase[tbl], arguments || s.arguments);

function r(tbl) 
 LS_window.LS_o(winPhase[tbl], arguments || r.arguments);

function p() 
 LS_window.LS_u(phase, arguments || p.arguments);

myEnv.setPhase = setPhase;
myEnv.setWin = setWin;
myEnv.c = c;
myEnv.error = error;
myEnv.end = end;
myEnv.start = start;
myEnv.loop = loop;
myEnv.retry = retry;
myEnv.s0 = s0;
myEnv.bw = bw;
myEnv.y = y;
myEnv.convert = convert;
myEnv.d = d;
myEnv.z = z;
myEnv.n = n;
myEnv.s = s;
myEnv.r = r;
myEnv.p = p;
myEnv.LS_window = LS_window;

// END OF HEADER

setPhase(2503);
start('*******', null, 10000, 150000);

---

bw(0.0);

---

【参考方案1】：

您看到的交换是 Lightstreamer 协议，只有一些值是由应用程序确定的。

此协议基于 javascript，由旧客户端库使用；例如，LS_e 函数由客户端库提供。

客户端可以使用多种协议；其中之一，基于纯文本的 TLCP，是公开的并记录在案的here。