feat(*) refactor and simplify parsing of ingress rules to kong config

Breaking changes
-  KongIngress overrides for Service and Upstream will now be picked up
  from annotation on the service and not the route.

Changelog:
- Directly translate to Kong configuration objects
  Previously, the Ingress rules were parsed into Nginx Server and
  Location blocks, and then translated to Kong configuration. This was
  more complicated and information was lost during translation.
- Translation is now done to an intermediate Kong state and then further
  translated to the final format. The final format will differ, based on
  if Kong is running in a db or a db-less mode.
- Method based routes are now supported (#202)
- Default backend in Ingress rules is now respected and a default
  fallback route in Kong will be created if a default backend exists in
  one of the Ingress objects. If multiple Ingress objects have a default
  backed, the Ingress created first will be respected.

Fix #202
Fix #241

Gopkg.toml

@@ -37,10 +37,6 @@ required = [
   name = "github.com/golang/glog"
   branch = "master"
 
-[[constraint]]
-  name = "github.com/imdario/mergo"
-  version = "0.2.4"
-
 [[constraint]]
   name = "github.com/pkg/errors"
   version = "0.8.0"
@@ -83,3 +79,11 @@ source = "https://github.com/fsnotify/fsnotify.git"
 [[constraint]]
   name = "github.com/hbagdi/go-kong"
   version = "0.3.0"
+
+[[constraint]]
+  name = "github.com/hbagdi/deck"
+  version = "0.1.0"
+
+[[constraint]]
+  name = "github.com/imdario/mergo"
+  version = "0.3.7"

internal/apis/configuration/v1/types.go

@@ -1,6 +1,7 @@
 package v1
 
 import (
+	"github.com/hbagdi/go-kong/kong"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
@@ -15,9 +16,9 @@ type KongIngress struct {
 	// +optional
 	metav1.ObjectMeta `json:"metadata,omitempty"`
 
-	Upstream *Upstream `json:"upstream,omitempty"`
-	Proxy    *Proxy    `json:"proxy,omitempty"`
-	Route    *Route    `json:"route,omitempty"`
+	Upstream *kong.Upstream `json:"upstream,omitempty"`
+	Proxy    *kong.Service  `json:"proxy,omitempty"`
+	Route    *kong.Route    `json:"route,omitempty"`
 }
 
 // KongIngressList is a top-level list type. The client methods for
@@ -30,64 +31,3 @@ type KongIngressList struct {
 	// +optional
 	Items []KongIngress `json:"items"`
 }
-
-// Route defines optional settings defined in Kong Routes
-type Route struct {
-	Methods       []string `json:"methods"`
-	RegexPriority int      `json:"regex_priority"`
-	StripPath     bool     `json:"strip_path"`
-	PreserveHost  bool     `json:"preserve_host"`
-	Protocols     []string `json:"protocols"`
-}
-
-type Upstream struct {
-	HashOn             string        `json:"hash_on"`
-	HashOnCookie       string        `json:"hash_on_cookie"`
-	HashOnCookiePath   string        `json:"hash_on_cookie_path"`
-	HashOnHeader       string        `json:"hash_on_header"`
-	HashFallback       string        `json:"hash_fallback"`
-	HashFallbackHeader string        `json:"hash_fallback_header"`
-	Healthchecks       *Healthchecks `json:"healthchecks,omitempty"`
-	Slots              int           `json:"slots"`
-}
-
-type Proxy struct {
-	Protocol       string `json:"protocol"`
-	Path           string `json:"path"`
-	ConnectTimeout int    `json:"connect_timeout"`
-	Retries        *int   `json:"retries"`
-	ReadTimeout    int    `json:"read_timeout"`
-	WriteTimeout   int    `json:"write_timeout"`
-}
-
-type Healthchecks struct {
-	Active  *ActiveHealthCheck `json:"active,omitempty"`
-	Passive *Passive           `json:"passive,omitempty"`
-}
-
-type ActiveHealthCheck struct {
-	Concurrency int        `json:"concurrency"`
-	Healthy     *Healthy   `json:"healthy"`
-	HTTPPath    string     `json:"http_path"`
-	Timeout     int        `json:"timeout"`
-	Unhealthy   *Unhealthy `json:"unhealthy"`
-}
-
-type Passive struct {
-	Healthy   *Healthy   `json:"healthy,omitempty"`
-	Unhealthy *Unhealthy `json:"unhealthy,omitempty"`
-}
-
-type Healthy struct {
-	HTTPStatuses []int `json:"http_statuses"`
-	Interval     int   `json:"interval"`
-	Successes    int   `json:"successes"`
-}
-
-type Unhealthy struct {
-	HTTPFailures int   `json:"http_failures"`
-	HTTPStatuses []int `json:"http_statuses"`
-	Interval     int   `json:"interval"`
-	TCPFailures  int   `json:"tcp_failures"`
-	Timeouts     int   `json:"timeouts"`
-}