[policy] .request_phases

Offer an interator for just request phases skipping the init and
init_worker.

gateway/src/apicast/policy.lua

@@ -8,8 +8,7 @@
 
 local _M = { }
 
-local PHASES = {
-    'init', 'init_worker',
+local REQUEST_PHASES = {
     'rewrite', 'access',
     'content', 'balancer',
     'header_filter', 'body_filter',
@@ -18,6 +17,15 @@ local PHASES = {
     'ssl_certificate',
 }
 
+local INIT_PHASES = {
+    'init', 'init_worker',
+}
+
+local PHASES = { }
+
+table.move(INIT_PHASES, 1, #INIT_PHASES, #PHASES + 1, PHASES)
+table.move(REQUEST_PHASES, 1, #REQUEST_PHASES, #PHASES + 1, PHASES)
+
 local GC = require('apicast.gc')
 local setmetatable_gc_clone = GC.setmetatable_gc_clone
 local ipairs = ipairs
@@ -64,4 +72,8 @@ function _M.phases()
     return ipairs(PHASES)
 end
 
+function _M.request_phases()
+    return ipairs(REQUEST_PHASES)
+end
+
 return _M

spec/policy_spec.lua

@@ -1,4 +1,5 @@
 local policy = require 'apicast.policy'
+local tab_clone = require('table.clone')
 
 describe('policy', function()
   local phases = {
@@ -117,6 +118,21 @@ describe('policy', function()
     end)
   end)
 
+  describe('.request_phases', function()
+    it('returns the request nginx phases where policies can run, sorted by order of execution', function()
+      local request_phases = tab_clone(phases)
+      table.remove(request_phases, 1) -- init
+      table.remove(request_phases, 1) -- init_worker
+
+      local res = {}
+      for _, phase in policy.request_phases() do
+        table.insert(res, phase)
+      end
+
+      assert.same(request_phases, res)
+    end)
+  end)
+
   describe('garbage collection', function()
     it('runs __gc metamethod when a policy instance is garbage-collected', function()
       local MyPolicy, mt = policy.new('my_policy', '1.0')