First task

data/db.yaml

+- full_link: https://habr.com/ru/company/ruvds/news/t/577872/
+  short_link: ex1
+- full_link: https://habr.com/ru/company/ruvds/blog/576376/
+  short_link: li2
+- full_link: https://habr.com/ru/company/ruvds/blog/577754/
+  short_link: en3
+- full_link: https://habr.com/ru/company/ruvds/blog/576716/
+  short_link: zv4

lib/libs.py

+import random
+import os
+import json
+
+
+class Config:
+    def __init__(self, path=os.path.join(__file__, r"..\..\settings.json")):
+        self._path = path
+        with open(self._path, "r") as f:
+            js = json.loads(f.read())
+            storage = js['storage']
+            path_to_yaml = js['path_to_yaml']
+
+        self.storage = storage
+        self.path_to_yaml = path_to_yaml
+
+
+class LinkGenerator:
+    """Takes the last generated link and returns a new in new_link variable"""
+    # сделал бы с помошью Unique но в ТЗ так
+    def __init__(self, last_link: str):
+        self._last_link = last_link
+        self._last_number = int(self._get_num()) + 1
+        self.new_link = (self._random_alpha() + str(self._last_number))
+
+    def _get_num(self):
+        """Parses a string and returns only numbers"""
+        try:
+            t = ''
+            for i in self._last_link:
+                if i.isdigit():
+                    t += i
+            return t
+        except Exception as e:
+            print(f'Error: {e}')
+            return ''
+
+    def _random_alpha(self):
+        """Return two random letters"""
+        return chr(random.randint(97, 122)) + chr(random.randint(97, 122))

lib/yaml_manager.py

+import os
+import yaml
+
+yaml_conf = YamlConfig()
+
+class YamlManager:
+    def __init__(self, path):
+        self._path = path
+        if os.path.exists(self._path):
+            self.last_short_link = self.get_last_dict()['short_link']
+        else:
+            self.last_short_link = '0'
+
+    def save(self, short_link: str, full_link: str):
+        with open(self._path, 'a') as f:
+            yaml.dump([{"short_link": short_link, "full_link": full_link}], f, default_flow_style=False)
+
+    def read(self):
+        """Return all dict from yaml"""
+        try:
+            with open(yaml_conf.path_to_yaml) as f:
+                templates = yaml.safe_load(f)
+            return templates
+        except:
+            return None
+
+    def get_by_key(self, key):
+        try:
+            for s in self.read():
+                if key == s['short_link']:
+                    return s['full_link']
+        except:
+            return False
+
+    def get_last_dict(self):
+        """Return last element from yaml"""
+        return self.read()[-1]
\ No newline at end of file

main.py

+from starlette.responses import PlainTextResponse, RedirectResponse
+from typing import Optional
+from fastapi import FastAPI, Path, Query
+
+from settings import YamlConfig
+from settings import StorageConfig
+from lib import YamlManager
+
+storage_conf = StorageConfig()
+yaml_conf = YamlConfig()
+yaml = YamlManager(path=yaml_conf.path_to_yaml)
+
+app = FastAPI()
+
+
+@app.get("/{shorted_link}")
+async def short_link(shorted_link: str):
+    if storage_conf.storage == 'yaml':
+        key = yaml.get_by_key(shorted_link)
+        if key:
+            return RedirectResponse(url=key)
+        else:
+            return '404 Not found'

requirements.txt

+argon2-cffi==21.1.0
+asgiref==3.4.1
+atomicwrites==1.4.0
+attrs==21.2.0
+backcall==0.2.0
+beautifulsoup4==4.9.3
+betterconf==2.6.1
+bleach==4.1.0
+bs4==0.0.1
+certifi==2021.5.30
+cffi==1.14.6
+charset-normalizer==2.0.4
+click==8.0.1
+colorama==0.4.4
+cycler==0.10.0
+debugpy==1.4.1
+decorator==5.0.9
+defusedxml==0.7.1
+entrypoints==0.3
+fastapi==0.68.1
+Flask==2.0.1
+greenlet==1.1.1
+h11==0.12.0
+httptools==0.2.0
+idna==3.2
+iniconfig==1.1.1
+ipykernel==6.3.1
+ipython==7.27.0
+ipython-genutils==0.2.0
+itsdangerous==2.0.1
+jedi==0.18.0
+Jinja2==3.0.1
+jsonschema==3.2.0
+jupyter-client==7.0.2
+jupyter-core==4.7.1
+jupyterlab-pygments==0.1.2
+jupyterthemes==0.20.0
+kiwisolver==1.3.2
+lesscpy==0.15.0
+lxml==4.6.3
+MarkupSafe==2.0.1
+matplotlib==3.4.3
+matplotlib-inline==0.1.2
+mistune==0.8.4
+MouseInfo==0.1.3
+nbclient==0.5.4
+nbconvert==6.1.0
+nbformat==5.1.3
+nest-asyncio==1.5.1
+notebook==6.4.3
+numpy==1.21.2
+packaging==21.0
+pandocfilters==1.4.3
+parso==0.8.2
+pathlib==1.0.1
+pickleshare==0.7.5
+Pillow==8.3.1
+pluggy==1.0.0
+ply==3.11
+prometheus-client==0.11.0
+prompt-toolkit==3.0.20
+py==1.10.0
+PyAutoGUI==0.9.53
+pycparser==2.20
+pydantic==1.8.2
+PyGetWindow==0.0.9
+Pygments==2.10.0
+PyMsgBox==1.0.9
+pyparsing==2.4.7
+pyperclip==1.8.2
+PyRect==0.1.4
+pyrsistent==0.18.0
+PyScreeze==0.1.27
+pyTelegramBotAPI==4.0.0
+pytest==6.2.5
+python-dateutil==2.8.2
+python-dotenv==0.19.0
+PyTweening==1.0.3
+pytz==2021.1
+pywin32==301
+pywinpty==1.1.3
+PyYAML==5.4.1
+pyzmq==22.2.1
+requests==2.26.0
+Send2Trash==1.8.0
+six==1.16.0
+soupsieve==2.2.1
+SQLAlchemy==1.4.23
+starlette==0.14.2
+terminado==0.11.1
+testpath==0.5.0
+toml==0.10.2
+tornado==6.1
+traitlets==5.1.0
+typing-extensions==3.10.0.2
+urllib3==1.26.6
+uvicorn==0.15.0
+watchgod==0.7
+wcwidth==0.2.5
+webencodings==0.5.1
+websockets==10.0
+Werkzeug==2.0.1
+
+
+
+pip install PyYAML
+pip install fastapi
+
+
+
+PyYAML>=5.4.1
+fastapi>=0.68.1

settings.json

+{
+  "name": "$name$",
+  "version": "$version$",
+  "dependencies": {
+    $END$
+  }
+}