Commits on Aug 23, 2019

1. Liquid: Available context move to readwrite linked list. …

   This commit allows users to use capture in their liquid expressions and
   assign variables if they needed.
   
   Due to the available_context return a readonly list, capture function
   cannot assign the variable and things start to mess up[0]. Due to allow
   users to define variables in liquid is quite bad, a new read-write
   linked list is created with an empty table to allow write to a temporal
   table.
   
   [0] Exception:
   ```
   2019/08/09 13:51:23 [error] 15620#15620: *9 lua entry thread aborted: runtime error: /home/centos/gateway/src/apicast/linked_list.lua:19: readonly list
   stack traceback:
   coroutine 0:
           [C]: in function 'error'
           /home/centos/gateway/src/apicast/linked_list.lua:19: in function '__newindex'
           ./lua_modules/share/lua/5.1/liquid.lua:2512: in function 'define_var'
           ./lua_modules/share/lua/5.1/liquid.lua:2459: in function 'visit'
           ./lua_modules/share/lua/5.1/liquid.lua:1975: in function 'render'
           /home/centos/gateway/src/apicast/policy/headers/headers.lua:91: in function 'run_commands'
           /home/centos/gateway/src/apicast/policy/headers/headers.lua:151: in function </home/centos/gateway/src/apicast/policy/headers/headers.lua:147>
           /home/centos/gateway/src/apicast/policy_chain.lua:200: in function 'rewrite'
           ...s/gateway/src/apicast/policy/local_chain/local_chain.lua:59: in function <...s/gateway/src/apicast/policy/local_chain/local_chain.lua:54>
           /home/centos/gateway/src/apicast/policy_chain.lua:200: in function 'rewrite'
           rewrite_by_lua(lua_Iy6Gdl:498):3: in main chunk, client: 172.18.0.1, server: _, request: "GET /bridge-1/?user_key=132 HTTP/1.1", host: "one"
   
   ```
   
   Fix THREESCALE-1911
   
   Signed-off-by: Eloy Coto <eloy.coto@gmail.com>

   

   eloycoto committed Aug 23, 2019
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