add nginx comps for service forwarding

Signed-off-by: letonghan <[email protected]>

comps/nginx/README.md

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+# Nginx for Microservice Forwarding
+
+[Nginx](https://nginx.org/en/) serves as a versatile tool in the realm of web services, functioning as an HTTP and reverse proxy server, and a generic TCP/UDP proxy server.
+
+In GenAIComps, we utilize nginx to streamline our network services. We provide an nginx Docker container, which is essential for deploying [OPEA](https://github.com/opea-project) microservices, mega services, and managing endpoint and port forwarding for frontend services. Our use of Docker to launch nginx ensures a flexible and reliable service deployment, optimizing our infrastructure to meet diverse operational demands.
+
+## 🚀1. Build Docker Image
+
+```bash
+docker build -t opea/nginx:latest --build-arg https_proxy=$https_proxy --build-arg http_proxy=$http_proxy -f ./Dockerfile .
+```
+
+## 🚀2. Environment Settings
+
+To use Nginx for servcie forwarding, users need to setup environment variables first. The variables set here will be substituted in `nginx.conf.template`.
+
+For example, if you want to use Nginx to forward the frontend, backend services of a [ChatQnA](https://github.com/opea-project/GenAIExamples/tree/main/ChatQnA) example, setup environment variables as below:
+
+```bash
+export FRONTEND_SERVICE_IP=${your_frontend_service_ip}
+export FRONTEND_SERVICE_PORT=5173
+export BACKEND_SERVICE_NAME=chatqna
+export BACKEND_SERVICE_IP=${your_backend_service_ip}
+export BACKEND_SERVICE_PORT=8888
+```
+
+For other examples, change the variable above following the corresponding READMEs.
+
+If you want to forward other services like `dataprep` using Nginx, add the code below in `nginx.conf.template` and setup the right parameters for it. Notice that the `${dataprep_service_endpoint}` need to be the form of `/v1/xxx/xxx`.
+
+```bash
+location ${dataprep_service_endpoint} {
+    proxy_pass http://${dataprep_service_ip}:${dataprep_service_port};
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+}
+```
+
+## 🚀3. Start Nginx Service
+
+Nginx will expose `80` as the default port. You can choose other avaliable ports as `${your_nginx_port}` for Nginx docker.
+
+```bash
+docker run -d --name opea-nginx -p ${your_nginx_port}:80 \
+	-e FRONTEND_SERVICE_IP=${FRONTEND_SERVICE_IP} \
+	-e FRONTEND_SERVICE_PORT=${FRONTEND_SERVICE_PORT} \
+	-e BACKEND_SERVICE_NAME=${BACKEND_SERVICE_NAME} \
+    -e BACKEND_SERVICE_IP=${BACKEND_SERVICE_IP} \
+    -e BACKEND_SERVICE_PORT=${BACKEND_SERVICE_PORT} \
+    opea/nginx:latest
+```
+
+## 🚀4. Consume Forwarded Service
+
+To consume the backend service, use the curl command as below (this is a ChatQnA service example):
+
+```bash
+curl http://${your_nginx_ip}:${your_nginx_port}/v1/chatqna \
+    -H "Content-Type: application/json" \
+    -d '{"messages": "What is Deep Learning?"}'
+```
+
+For the frontend service, open the following URL in your browser: `http://${your_nginx_ip}:${your_nginx_port}`.

comps/nginx/docker/Dockerfile

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+# Copyright (C) 2024 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+
+FROM nginx:alpine
+
+RUN apk add --no-cache gettext
+
+COPY nginx.conf.template /etc/nginx/nginx.conf.template
+
+ENV SERVICE_NAME=chatqna
+ENV SERVICE_IP=localhost
+ENV SERVICE_PORT=8888
+
+CMD /bin/sh -c "envsubst '${FRONTEND_SERVICE_IP} ${FRONTEND_SERVICE_PORT} ${BACKEND_SERVICE_NAME} ${BACKEND_SERVICE_IP} ${BACKEND_SERVICE_PORT}' < /etc/nginx/nginx.conf.template > /etc/nginx/conf.d/default.conf && nginx -g 'daemon off;'"

comps/nginx/docker/nginx.conf.template

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+# Copyright (C) 2024 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+
+server {
+    listen       80;
+    listen  [::]:80;
+
+    location /home {
+        root   /usr/share/nginx/html;
+        index  index.html index.htm;
+    }
+
+    location / {
+        proxy_pass http://${FRONTEND_SERVICE_IP}:${FRONTEND_SERVICE_PORT};
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location /v1/${BACKEND_SERVICE_NAME} {
+        proxy_pass http://${BACKEND_SERVICE_IP}:${BACKEND_SERVICE_PORT};
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+}