# Selenium и Chromedriver

Amverum Cloud uses containers under the hood. To be able to use selenium in a container, you need to install the necessary libraries and specify the display port in this container.

## Using a ready-made image

[This image](https://github.com/joyzoursky/docker-python-chromedriver) already has the ChromeDriver and Chrome we need

**Installation steps**:

1. Create a Dockerfile in the project directory.
2. In the Dockerfile, specify the image with
    ```dockerfile
    FROM joyzoursky/python-chromedriver:3.9
    ```
3. We assign a WORKDIR and specify the application files that will be included in the final image (all files in the project folder):  
    ```dockerfile
    WORKDIR  /app
    COPY  .  /app
    ```
4. Add a command to install dependencies *(we will specify them a little later)*:  
    ```dockerfile
    RUN  pip  install  -r  requirements.txt
    ```
5. We set the command to launch the application:  
    ```dockerfile
    CMD ["python", "main.ru"]
    ```
    
**The resulting Dockerfile:**
```dockerfile
FROM  joyzoursky/python-chromedriver:3.9
WORKDIR  /app
COPY  .  /app
RUN  pip  install  -r  requirements.txt
CMD  ["python",  "main.ru"]
```
```{eval-rst}
.. admonition:: Note
   :class: info

   Instead of `version 3.9` you can specify another Python version that you need and that is supported by the image author.
```
## Creating your own image with ChromeDriver
If the required Python version is not supported, you can create your own image with the required version by installing the necessary drivers into it.

In the example given, the base image is [python image:3.8](https://hub.docker.com/_/python) which can be replaced with a suitable one.
 
```dockerfile
# set the base image (instead of 3.8, you can specify another version of Python)
FROM python:3.8

# we are installing google-chrome
RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
RUN sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'
RUN apt-get -y update
RUN apt-get install -y google-chrome-stable

# set the desired display port
ENV DISPLAY=:99
```

## Example
The example will output the Title of the page www.python.org

**Add the following files to the root of the project:**

 - requirements.txt
   ```text
   selenium==4.17.2
   ```
 - amverum.yml
   ```yaml
   meta:
     environment: docker
     toolchain:
       name: docker
       version: latest
   build:
     dockerfile: Dockerfile
     skip: false
   run:
     persistenceMount: /data
     containerPort: 80
   ```
     
 - Dockerfile
   ```dockerfile
   FROM  joyzoursky/python-chromedriver:3.9
   WORKDIR  /app
   COPY  .  /app
   RUN  pip  install  -r  requirements.txt
   CMD  ["python",  "main.ru"]
   ```
    
 - main.ru
   ```python
   from selenium import webdriver
   from selenium.webdriver.common.keys import Keys
   from selenium.webdriver.chrome.options import Options

   chrome_options = Options()
   chrome_options.add_argument('--headless')
   chrome_options.add_argument('--no-sandbox')
   chrome_options.add_argument('--disable-dev-shm-usage')

   driver = webdriver.Chrome(options=chrome_options)
   driver.get("https://www.python.org")
   print(driver.title)

   driver.close()
   ```
If the program works correctly, the following text will be displayed in the console: **Welcome to Python.org**