sslobodr | 392ebd5 | 2019-01-18 12:41:49 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2018-present Open Networking Foundation |
| 3 | |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
sslobodr | 392ebd5 | 2019-01-18 12:41:49 -0500 | [diff] [blame] | 16 | |
| 17 | package afrouter |
| 18 | |
| 19 | import ( |
sslobodr | 392ebd5 | 2019-01-18 12:41:49 -0500 | [diff] [blame] | 20 | "errors" |
Kent Hagerman | 0ab4cb2 | 2019-04-24 13:13:35 -0400 | [diff] [blame] | 21 | "fmt" |
sslobodr | 392ebd5 | 2019-01-18 12:41:49 -0500 | [diff] [blame] | 22 | "google.golang.org/grpc" |
| 23 | ) |
| 24 | |
Kent Hagerman | 1e9061e | 2019-05-21 16:01:21 -0400 | [diff] [blame] | 25 | var allRouters = make(map[string]Router) |
sslobodr | 392ebd5 | 2019-01-18 12:41:49 -0500 | [diff] [blame] | 26 | |
| 27 | // The router interface |
| 28 | type Router interface { |
Kent Hagerman | 0ab4cb2 | 2019-04-24 13:13:35 -0400 | [diff] [blame] | 29 | Name() string |
Scott Baker | 112b0d4 | 2019-08-22 08:32:26 -0700 | [diff] [blame^] | 30 | |
| 31 | // Route() returns a backend and a connection. The connection is optional and if unspecified, then any |
| 32 | // connection on the backend may be used. |
| 33 | Route(interface{}) (*backend, *connection) |
| 34 | |
Kent Hagerman | 0ab4cb2 | 2019-04-24 13:13:35 -0400 | [diff] [blame] | 35 | Service() string |
Kent Hagerman | 03b5899 | 2019-08-29 17:21:03 -0400 | [diff] [blame] | 36 | IsStreaming(string) (bool, bool) |
Kent Hagerman | 1e9061e | 2019-05-21 16:01:21 -0400 | [diff] [blame] | 37 | BackendCluster(string, string) (*cluster, error) |
| 38 | FindBackendCluster(string) *cluster |
sslobodr | 392ebd5 | 2019-01-18 12:41:49 -0500 | [diff] [blame] | 39 | ReplyHandler(interface{}) error |
Kent Hagerman | 0ab4cb2 | 2019-04-24 13:13:35 -0400 | [diff] [blame] | 40 | GetMetaKeyVal(serverStream grpc.ServerStream) (string, string, error) |
sslobodr | 392ebd5 | 2019-01-18 12:41:49 -0500 | [diff] [blame] | 41 | } |
| 42 | |
sslobodr | cd37bc5 | 2019-01-24 11:47:16 -0500 | [diff] [blame] | 43 | func newRouter(config *RouterConfig) (Router, error) { |
Kent Hagerman | 0ab4cb2 | 2019-04-24 13:13:35 -0400 | [diff] [blame] | 44 | r, err := newMethodRouter(config) |
| 45 | if err == nil { |
sslobodr | 392ebd5 | 2019-01-18 12:41:49 -0500 | [diff] [blame] | 46 | allRouters[r.Name()] = r |
| 47 | } |
| 48 | return r, err |
| 49 | } |
| 50 | |
sslobodr | cd37bc5 | 2019-01-24 11:47:16 -0500 | [diff] [blame] | 51 | func newSubRouter(rconf *RouterConfig, config *RouteConfig) (Router, error) { |
Kent Hagerman | 1e9061e | 2019-05-21 16:01:21 -0400 | [diff] [blame] | 52 | switch config.Type { |
| 53 | case RouteTypeRpcAffinityMessage: |
Kent Hagerman | 0ab4cb2 | 2019-04-24 13:13:35 -0400 | [diff] [blame] | 54 | r, err := newAffinityRouter(rconf, config) |
sslobodr | 5f0b5a3 | 2019-01-24 07:45:19 -0500 | [diff] [blame] | 55 | if err == nil { |
| 56 | allRouters[rconf.Name+config.Name] = r |
| 57 | } |
| 58 | return r, err |
Kent Hagerman | 1e9061e | 2019-05-21 16:01:21 -0400 | [diff] [blame] | 59 | case RouteTypeBinding: |
Kent Hagerman | 0ab4cb2 | 2019-04-24 13:13:35 -0400 | [diff] [blame] | 60 | r, err := newBindingRouter(rconf, config) |
sslobodr | 5f0b5a3 | 2019-01-24 07:45:19 -0500 | [diff] [blame] | 61 | if err == nil { |
| 62 | allRouters[rconf.Name+config.Name] = r |
| 63 | } |
| 64 | return r, err |
Kent Hagerman | 1e9061e | 2019-05-21 16:01:21 -0400 | [diff] [blame] | 65 | case RouteTypeRoundRobin: |
Kent Hagerman | 0ab4cb2 | 2019-04-24 13:13:35 -0400 | [diff] [blame] | 66 | r, err := newRoundRobinRouter(rconf, config) |
sslobodr | 5f0b5a3 | 2019-01-24 07:45:19 -0500 | [diff] [blame] | 67 | if err == nil { |
| 68 | allRouters[rconf.Name+config.Name] = r |
| 69 | } |
| 70 | return r, err |
Scott Baker | 112b0d4 | 2019-08-22 08:32:26 -0700 | [diff] [blame^] | 71 | case RouteTypeSource: |
| 72 | r, err := newSourceRouter(rconf, config) |
| 73 | if err == nil { |
| 74 | allRouters[rconf.Name+config.Name] = r |
| 75 | } |
| 76 | return r, err |
sslobodr | 5f0b5a3 | 2019-01-24 07:45:19 -0500 | [diff] [blame] | 77 | default: |
| 78 | return nil, errors.New(fmt.Sprintf("Internal error, undefined router type: %s", config.Type)) |
| 79 | } |
sslobodr | 392ebd5 | 2019-01-18 12:41:49 -0500 | [diff] [blame] | 80 | } |