HTTP2Grpc plugin for traefik

This plugin is an attempt to implement converter of HTTP protocol to gRPC as a middleware plugin for Traefik. It is useful when you declare router to gRPC backend for gRPC client, and additionally you want to intercept connection with middleware, that do HTTP request to third party services and forward it back to gRPC client. Forward Auth for example.

For development, was used following gRPC specs:

• https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md
• https://github.com/grpc/grpc/blob/master/doc/http-grpc-status-mapping.md
• https://grpc.github.io/grpc/core/md_doc_statuscodes.html

Configuration

Flags meaning

• bodyAsStatusMessage: if true, middleware try set body (as utf8 string) to grpc status message, if false, grpc status message will be empty. Default is false
• logLevel: info or debug. Default is info

Static config examples

• cli as local plugin

--experimental.localplugins.http2grpc=true
--experimental.localplugins.http2grpc.modulename=github.com/v-electrolux/http2grpc

• envs as local plugin

TRAEFIK_EXPERIMENTAL_LOCALPLUGINS_http2grpc=true
TRAEFIK_EXPERIMENTAL_LOCALPLUGINS_http2grpc_MODULENAME=github.com/v-electrolux/http2grpc

• yaml as local plugin

Copy
experimental:
  localplugins:
    http2grpc:
      modulename: github.com/v-electrolux/http2grpc

• toml as local plugin

Copy
[experimental.localplugins.http2grpc]
    modulename = "github.com/v-electrolux/http2grpc"

Dynamic config examples

• docker labels

traefik.http.middlewares.checkAuth.basicauth.users=test:$$apr1$$H6uskkkW$$IgXLP6ewTrSuBkTrqE8wj/
traefik.http.middlewares.http2grpcMiddleware.plugin.http2grpc.bodyAsStatusMessage=true
traefik.http.middlewares.http2grpcMiddleware.plugin.http2grpc.logLevel=info
traefik.http.routers.http2grpcRouter.middlewares=http2grpcMiddleware,checkAuth

• yaml

Copy
http:

  routers:
    http2grpcRouter:
      rule: host(`demo.localhost`)
      service: grpcBackend
      entryPoints:
        - web
      middlewares:
        - http2grpcMiddleware
        - someForwardAuthMiddleware

  services:
    grpcBackend:
      loadBalancer:
        servers:
          - url: 127.0.0.1:5000

  middlewares:
    http2grpcMiddleware:
      plugin:
        http2grpc:
          bodyAsStatusMessage: true
          logLevel: info
    checkAuth:
      basicauth:
        users:
          - "test:$apr1$H6uskkkW$IgXLP6ewTrSuBkTrqE8wj/"