gh-10 Add build script for standalone versions

* Add build script to build standalone versions of ws-client.q & ws-server.q
* Update README to include details of standalone versions
* Incorporate necessary reQ functions into ws-client, if reQ not independently loaded
* Update build number in Conda pkg configs
* Make ws-handler capable to be loaded multiple times without side-effects

Resolves gh-10

README.md

@@ -2,8 +2,6 @@
 
 A simple set of modules for using WebSockets in KDB+/q
 
-`ws-handler` is a generic wrapper for `.z.ws` in order to allow different handlers to be defined depending on wether the q session is a client or server for the present connection.
-
 `ws-client` provides function `.ws.open` to open a WebSocket as a client, allowing definition of a per-
 socket callback function, tracked in a keyed table `.ws.w`
 
@@ -12,9 +10,37 @@ implementation in the form of `wschaintick.q`, a chained tickerplant which
 subscribes to a regular kdb+tick TP & republishes received records via 
 WebSockets. [See below](#ws-handler--wschaintickq) for more details.
 
-## Installation
+`ws-handler` is a generic wrapper for `.z.ws` in order to allow different handlers to be defined depending
+on wether the q session is a client or server for the present connection. Typically it shouldn't be loaded
+directly but will be loaded as a dependency of the client/server libs.
+
+## Setup
+
+The simplest way for most people to setup will be using the standalone scripts from the latest release in the
+repo's [Releases](https://github.com/jonathonmcmurray/ws.q/releases) tab. These scripts can be loaded directly
+into a q session & have no dependencies e.g. (with client library)
+
+```
+ $ q
+KDB+ 4.0 2020.05.04 Copyright (C) 1993-2020 Kx Systems
+l64/ 12(16)core 16296MB jonny desktop-c4h2kis 127.0.1.1 EXPIRE 2021.06.05 [email protected] KOD #4171328
+
+q)\l ws-client_0.2.0.q
+q).echo.upd:show
+q).echo.h:.ws.open["wss://echo.websocket.org";`.echo.upd]
+q).echo.h "hello world"
+q)"hello world"
+```
+
+Note that other examples in this readme use e.g. `.utl.require"ws-client"` to load lib instead of `\l` - you can simply replace
+with the relevant `\l` command if using the standalone scripts.
 
-The simplest way to install the modules is via Anaconda. Assuming an Anaconda distribution is installed (e.g. [miniconda](https://conda.io/en/latest/miniconda.html)), installation is as follows:
+It should be possible to load both `ws-client_*.q` and `ws-server_*.q` in the same q process without conflict if a single
+process needs to act as both a server & client.
+
+## Installation via Anaconda
+
+It is also possible to install the modules via Anaconda. Assuming an Anaconda distribution is installed (e.g. [miniconda](https://conda.io/en/latest/miniconda.html)), installation is as follows:
 
 ```bash
 $ conda install -c jmcmurray ws-client ws-server
@@ -60,7 +86,7 @@ l64/ 8()core 16048MB jmcmurray homer.aquaq.co.uk 127.0.1.1 EXPIRE 2018.06.30 Aqu
 
 q).utl.require"ws-client"
 q).echo.upd:show
-q).echo.h:.ws.open["ws://demos.kaazing.com/echo";`.echo.upd]
+q).echo.h:.ws.open["wss://echo.websocket.org";`.echo.upd]
 q).echo.h "hi"
 q)"hi"
 .echo.h "kdb4life"
@@ -131,6 +157,10 @@ socket. This object contains three keys, `type`, `tables` and `syms`. `type` is
 while `tables` & `syms` are lists of tables & syms to subscribe to. Similar to `u.q`,
 an empty list (including leaving out the key) subscribes to everything available.
 
+Note: if using the standalone version of `ws-server_*.q` from [Releases](https://github.com/jonathonmcmurray/ws.q/releases)
+page, please use `wschaintick.q` from there as well (version from main repo uses
+qutil to load `ws-server`).
+
 ### q client via `ws-client`
 
 ```

build.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# Script to build standalone release versions of ws-client.q and ws-server.q
+
+RELEASE=${1}
+
+cat ws-handler/ws-handler.q ws-client/ws.q > ws-client_${RELEASE}.q
+cat ws-handler/ws-handler.q ws-server/wsu.q > ws-server_${RELEASE}.q
+sed "s/.utl.require\"ws-server\"/\\\\l ws-server_${RELEASE}.q/g" wschaintick.q > wschaintick_${RELEASE}.q

ws-client/meta.yaml

@@ -1,6 +1,6 @@
 package:
   name: ws-client
-  version: 0.1.0
+  version: 0.2.0
 
 build:
   number: 0

ws-client/ws.q

@@ -1,5 +1,42 @@
 \d .ws
 
+/ if reQ not loaded, define necessary components here
+if[not `req in key `;
+  .url.parse0:{[q;x]
+    if[x~hsym`$255#"a";'"hsym too long - consider using a string"];                   //error if URL~`: .. too long
+    x:.url.sturl x;                                                                   //ensure string URL
+    p:x til pn:3+first ss[x;"://"];                                                   //protocol
+    uf:("@"in x)&first[ss[x;"@"]]<first ss[pn _ x;"/"];                               //user flag - true if username present
+    un:pn;                                                                            //default to no user:pass
+    u:-1_$[uf;(pn _ x) til (un:1+first ss[x;"@"])-pn;""];                             //user:pass
+    d:x til dn:count[x]^first ss[x:un _ x;"/"];                                       //domain
+    a:$[dn=count x;enlist"/";dn _ x];                                                 //absolute path
+    o:`protocol`auth`host`path!(p;u;d;a);                                             //create URL object
+    :$[q;@[o;`path`query;:;query o`path];o];                                          //split path into path & query if flag set, return
+  };
+  .url.sturl:{(":"=first x)_x:$[-11=type x;string;]x};
+  .url.hsurl:{`$":",.url.sturl x};
+  .req.query:`method`url`hsym`path`headers`body`bodytype!();
+  .req.proxy:{[u]
+    p:(^/)`$getenv`$(floor\)("HTTP";"NO"),\:"_PROXY";                                 //check HTTP_PROXY & NO_PROXY env vars, upper & lower case - fill so p[0] is http_, p[1] is no_
+    t:max(first ":"vs u[`url]`host)like/:{(("."=first x)#"*"),x}each"," vs string p 1; //check if host is in NO_PROXY env var
+    t:not null[first p]|t;                                                            //check if HTTP_PROXY is defined & host isn't in NO_PROXY
+    :$[t;@[;`proxy;:;p 0];]u;                                                         //add proxy to URL object if required
+  };
+  .req.enchd:{[d]
+    k:2_@[k;where 10<>type each k:(" ";`),key d;string];                              //convert non-string keys to strings
+    v:2_@[v;where 10<>type each v:(" ";`),value d;string];                            //convert non-string values to strings
+    :("\r\n" sv ": " sv/:flip (k;v)),"\r\n\r\n";                                      //encode headers dict to HTTP headers
+  };
+  .req.buildquery:{[q]
+    r:string[q`method]," ",q[`url;`path]," HTTP/1.1\r\n",                             //method & endpoint TODO: fix q[`path] for proxy use case
+    "Host: ",q[`url;`host],$[count q`headers;"\r\n";""],                              //add host string
+         .req.enchd[q`headers],                                                       //add headers
+         $[count q`body;q`body;""];                                                   //add payload if present
+    :r;                                                                               //return complete query string
+  };
+ ];
+
 VERBOSE:@[value;`.ws.VERBOSE;$[count .z.x;"-verbose" in .z.x;0b]];      //default to non-verbose output
 
 w:([h:`int$()] hostname:`$();callback:`$())                             //table for recording open websockets

ws-handler/meta.yaml

@@ -1,6 +1,6 @@
 package:
   name: ws-handler
-  version: 0.1.0
+  version: 0.2.0
 
 build:
   number: 0

ws-handler/ws-handler.q

@@ -1,11 +1,13 @@
 / WebSockets handler module; create & receive WebSocket connections in a managable way
 \d .ws
 
-clients:([h:`int$()] hostname:`$())                                     //clients = incoming connections over ws
-servers:([h:`int$()] hostname:`$())                                     //servers = outgoing connections over ws
+/ Set up client/server tables & handlers without overwriting, so this script
+/ can be loaded multiple times without issue
+clients:@[value;`.ws.clients;([h:`int$()] hostname:`$())];              //clients = incoming connections over ws
+servers:@[value;`.ws.servers;([h:`int$()] hostname:`$())];              //servers = outgoing connections over ws
 
-onmessage.client:{x}                                                    //default echo
-onmessage.server:{x}                                                    //default echo
+onmessage.client:@[value;`.ws.onmessage.client;{{x}}];                  //default echo
+onmessage.server:@[value;`.ws.onmessage.server;{{x}}];                  //default echo
 
 .z.ws:{.ws.onmessage[$[.z.w in key servers;`server;`client]]x}          //pass messages to relevant handler func
 .z.wo:{clients,:(.z.w;.z.h)}                                            //log incoming connections

ws-server/meta.yaml

@@ -1,6 +1,6 @@
 package:
   name: ws-server
-  version: 0.1.0
+  version: 0.2.0
 
 build:
   number: 0