experimental path based routing

1. match services by host
2. when host matches, try to match mapping rules
3. if no services match both host and mapping rules
4. fallback to matching by host

conf/nginx.conf

@@ -6,6 +6,7 @@ worker_processes 1;
 env THREESCALE_DEPLOYMENT_ENV;
 env THREESCALE_PORTAL_ENDPOINT;
 env THREESCALE_CONFIG_FILE;
+env APICAST_PATH_ROUTING_ENABLED;
 
 # error_log stderr notice;
 # error_log logs/error.log warn;

src/provider.lua

@@ -131,7 +131,7 @@ local function get_debug_value()
   end
 end
 
-function _M.find_service(host)
+local function find_service_strict(host)
   for _,service in ipairs(_M.services or {}) do
     for _,_host in ipairs(service.hosts or {}) do
       if _host == host then
@@ -141,6 +141,33 @@ function _M.find_service(host)
   end
 end
 
+local function find_service_cascade(host)
+  local request = ngx.var.request
+  for _,service in ipairs(_M.services or {}) do
+    for _,_host in ipairs(service.hosts or {}) do
+      if _host == host then
+        local name = service.system_name or service.id
+        ngx.log(ngx.DEBUG, 'service ' .. name .. ' matched host ' .. _host)
+        local usage, matched_patterns = service:extract_usage(request)
+
+        if next(usage) and matched_patterns ~= '' then
+          ngx.log(ngx.DEBUG, 'service ' .. name .. ' matched patterns ' .. matched_patterns)
+          return service
+        end
+      end
+    end
+  end
+
+  return find_service_strict(host)
+end
+
+if os.getenv('APICAST_PATH_ROUTING_ENABLED') then
+  ngx.log(ngx.WARN, 'apicast experimental path routing enabled')
+  _M.find_service = find_service_cascade
+else
+  _M.find_service = find_service_strict
+end
+
 local http = {
   get = function(url)
     ngx.log(ngx.INFO, '[http] requesting ' .. url)

t/004-apicast-path-routing.t

@@ -0,0 +1,90 @@
+use Test::Nginx::Socket::Lua 'no_plan';
+use Cwd qw(cwd);
+
+my $pwd = cwd();
+
+$ENV{TEST_NGINX_LUA_PATH} = "$pwd/src/?.lua;;";
+
+$ENV{TEST_NGINX_BACKEND_CONFIG} = "$pwd/conf.d/backend.conf";
+$ENV{TEST_NGINX_APICAST_CONFIG} = "$pwd/conf.d/apicast.conf";
+
+log_level('debug');
+repeat_each(1);
+no_root_location();
+run_tests();
+
+__DATA__
+
+=== TEST 1: multi service configuration with path based routing
+Two services can exist together and are split by their hostname and mapping rules.
+--- main_config
+env APICAST_PATH_ROUTING_ENABLED=1;
+--- http_config
+  lua_package_path "$TEST_NGINX_LUA_PATH";
+  init_by_lua_block {
+    require('configuration').save({
+      services = {
+        {
+          id = 42,
+          backend_version = 1,
+          proxy = {
+            api_backend = "http://127.0.0.1:$TEST_NGINX_SERVER_PORT/api-backend/one/",
+            hosts = { 'same' },
+            backend_authentication_type = 'service_token',
+            backend_authentication_value = 'service-one',
+            proxy_rules = {
+              { pattern = '/one', http_method = 'GET', metric_system_name = 'one', delta = 1 }
+            }
+          }
+        },
+        {
+          id = 21,
+          backend_version = 2,
+          proxy = {
+            api_backend = "http://127.0.0.1:$TEST_NGINX_SERVER_PORT/api-backend/two/",
+            hosts = { 'same' },
+            backend_authentication_type = 'service_token',
+            backend_authentication_value = 'service-two',
+            proxy_rules = {
+              { pattern = '/two', http_method = 'GET', metric_system_name = 'two', delta = 2 }
+            }
+          }
+        }
+      }
+    })
+  }
+  lua_shared_dict api_keys 10m;
+--- config
+  include $TEST_NGINX_APICAST_CONFIG;
+
+  set $backend_endpoint 'http://127.0.0.1:$TEST_NGINX_SERVER_PORT';
+
+  location /transactions/authrep.xml {
+    content_by_lua_block { ngx.exit(200) }
+  }
+
+  location ~ /api-backend(/.+) {
+     echo 'yay, api backend: $1';
+  }
+
+  location ~ /test/(.+) {
+    proxy_pass $scheme://127.0.0.1:$server_port/$1$is_args$args;
+    proxy_set_header Host same;
+  }
+
+  location = /t {
+    echo_subrequest GET /test/one -q user_key=one-key;
+    echo_subrequest GET /test/two -q app_id=two-id&app_key=two-key;
+  }
+--- request
+GET /t
+--- response_body
+yay, api backend: /one/
+yay, api backend: /two/
+--- error_code: 200
+--- grep_error_log eval: qr/apicast cache (?:hit|miss|write) key: [^,\s]+/
+--- grep_error_log_out
+apicast cache miss key: 42:one-key:usage[one]=1
+apicast cache write key: 42:one-key:usage[one]=1
+apicast cache miss key: 21:two-id:two-key:usage[two]=2
+apicast cache write key: 21:two-id:two-key:usage[two]=2