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lab 1

lab 1

 
 

lab2

lab2

 
 

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Distributed systems

LAB1 (part 1) - Message Broker App using TCP sockets

Custom Protocol details

Request Body

Each request is sent with the following format:

{
  "ClientId": 6F9619FF-8B86-D011-B42D-00CF4FC964FF,
  "ClientAction": 1,
  "SensorTypes": ["sensor1"],
  "Data": 1488
}

ClientId is send by the broker after a client has initiated connection

ClientAction is an enum with the following values

  • Send
  • Subscribe
  • Unsubscribe
  • TopicList

Response Body:

Each response body is sent with the following format:

  {
    "Message": {"sensor": "Sensor type", "data": 1488},
    "StatusCode": Code
  }

Statuc Codes:

Each response has it's specific Status Code:

  • 0 (ClientAccepted): connection has been estabilished successfully
  • 1 (Success): operation has been successfully done
  • 2 (Fail): indicates that an error happened on the broker side

Response message from the response body will be empty if a Status code is equals to Fail

LAB 2 - A sample Web Api that manipulates with avia Tickets and Warrants

Used technologies

  • .Net Core 3 + C#
  • MongoDb as the main data storage
  • Redis that is used for caching

Implemented

  • An API as a Data Warehouse
  • Distributed Mongo database with three replica sets
  • Reverse Proxy middleware
  • Load balancing on the Proxy level
  • Redis caching on the Proxy level
  • Swagger Open API Spec

The whole solution contains 4 projects

  1. AviaSalesApi
  2. AviaSalesApiCopyOne
  3. AviaSalesApiCopyTwo
  4. ReverseProxy

Tickets

Get (filtered) list of Tickets

Request

Get all tickets:

GET /api/tickets Get filtered tickets: GET /api/tickets?countryFrom=string&cityFrom=string&countryTo=string&cityTo=string&takeOffDay=date

NOTE: Query parameters are handled dynamically. It's not required adding all of them at once.

Request Headers:

Accept: application/json, application/xml

Response

content-type: application/json

  [
  {
    "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "countryFrom": "string",
    "cityFrom": "string",
    "countryTo": "string",
    "cityTo": "string",
    "takeOffDay": "2020-10-30T19:11:42.302Z",
    "takeOffDate": "2020-10-30T19:11:42.302Z",
    "arriveOn": "2020-10-30T19:11:42.302Z",
    "transitPlaces": [
      {
        "country": "string",
        "city": "string",
        "airport": "string",
        "arriveDate": "2020-10-30T19:11:42.302Z",
        "takeOff": "2020-10-30T19:11:42.302Z"
      }
    ],
    "company": "string",
    "price": 0
  }
  ]

content-type: application/xml

  <ArrayOfTicketModel xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/AviaSalesApiCopyTwo.Models.Tickets">
    <TicketModel>
        <ArriveOn>2020-12-19T20:30:00.511Z</ArriveOn>
        <CityFrom>string</CityFrom>
        <CityTo>string</CityTo>
        <Company>string</Company>
        <CountryFrom>string</CountryFrom>
        <CountryTo>string</CountryTo>
        <Id>428c0d20-ee65-4546-8864-68aec6b5e50e</Id>
        <Price>0</Price>
        <TakeOffDate>2020-12-17T21:40:00.511Z</TakeOffDate>
        <TakeOffDay>2020-12-17T00:00:00.511Z</TakeOffDay>
        <TransitPlaces>
            <TransitPlace>
                <_x003C_Airport_x003E_k__BackingField>string</_x003C_Airport_x003E_k__BackingField>
                <_x003C_ArriveDate_x003E_k__BackingField>2020-12-17T16:50:00.511Z</_x003C_ArriveDate_x003E_k__BackingField>
                <_x003C_City_x003E_k__BackingField>string</_x003C_City_x003E_k__BackingField>
                <_x003C_Country_x003E_k__BackingField>string</_x003C_Country_x003E_k__BackingField>
                <_x003C_TakeOff_x003E_k__BackingField>2020-12-17T18:15:00.511Z</_x003C_TakeOff_x003E_k__BackingField>
            </TransitPlace>
            <TransitPlace>
                <_x003C_Airport_x003E_k__BackingField>string</_x003C_Airport_x003E_k__BackingField>
                <_x003C_ArriveDate_x003E_k__BackingField>2020-12-17T22:30:00.511Z</_x003C_ArriveDate_x003E_k__BackingField>
                <_x003C_City_x003E_k__BackingField>string</_x003C_City_x003E_k__BackingField>
                <_x003C_Country_x003E_k__BackingField>string</_x003C_Country_x003E_k__BackingField>
                <_x003C_TakeOff_x003E_k__BackingField>2020-12-18T14:25:00.511Z</_x003C_TakeOff_x003E_k__BackingField>
            </TransitPlace>
        </TransitPlaces>
    </TicketModel>
</ArrayOfTicketModel>

Status Codes

  • Status Code 200OK
  • Status Code 404NotFound

Get Ticket by Id

Request

/api/tickets/ec25779a-c742-4a4e-be03-cf8aeec12490

Request Headers

Accept: application/json, application/xml

Response

content-type: application/json

  {
  "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
  "countryFrom": "string",
  "cityFrom": "string",
  "countryTo": "string",
  "cityTo": "string",
  "takeOffDay": "2020-10-30T19:27:15.554Z",
  "takeOffDate": "2020-10-30T19:27:15.554Z",
  "arriveOn": "2020-10-30T19:27:15.554Z",
  "transitPlaces": [
    {
      "country": "string",
      "city": "string",
      "airport": "string",
      "arriveDate": "2020-10-30T19:27:15.555Z",
      "takeOff": "2020-10-30T19:27:15.555Z"
    }
  ],
  "company": "string",
  "price": 0
}

content-type: application/xml

  <?xml version="1.0" encoding="UTF-8"?>
<TicketModel>
	<id>3fa85f64-5717-4562-b3fc-2c963f66afa6</id>
	<countryFrom>string</countryFrom>
	<cityFrom>string</cityFrom>
	<countryTo>string</countryTo>
	<cityTo>string</cityTo>
	<takeOffDay>2020-10-30T19:34:32.233Z</takeOffDay>
	<takeOffDate>2020-10-30T19:34:32.233Z</takeOffDate>
	<arriveOn>2020-10-30T19:34:32.233Z</arriveOn>
	<transitPlaces>
		<country>string</country>
		<city>string</city>
		<airport>string</airport>
		<arriveDate>2020-10-30T19:34:32.233Z</arriveDate>
		<takeOff>2020-10-30T19:34:32.233Z</takeOff>
	</transitPlaces>
	<company>string</company>
	<price>0</price>
</TicketModel>

Status Codes

  • 200OK
  • 404NotFound

Create a new Ticket

Request

POST /api/tickets

Headers
  • content-type: application/json, application/xml
  • accept: application/json, application/xml

Request body

content-type: application/json

{
  "countryFrom": "string",
  "cityFrom": "string",
  "countryTo": "string",
  "cityTo": "string",
  "takeOffDay": "2020-10-30T19:40:02.872Z",
  "takeOffDate": "2020-10-30T19:40:02.873Z",
  "arriveOn": "2020-10-30T19:40:02.873Z",
  "transitPlaces": [
    {
      "country": "string",
      "city": "string",
      "airport": "string",
      "arriveDate": "2020-10-30T19:40:02.873Z",
      "takeOff": "2020-10-30T19:40:02.873Z"
    }
  ],
  "company": "string",
  "price": 0
}

content-type: application/xml

	<?xml version="1.0" encoding="UTF-8"?>
<TicketCreateUpdateModel>
	<countryFrom>string</countryFrom>
	<cityFrom>string</cityFrom>
	<countryTo>string</countryTo>
	<cityTo>string</cityTo>
	<takeOffDay>2020-10-30T19:41:32.770Z</takeOffDay>
	<takeOffDate>2020-10-30T19:41:32.770Z</takeOffDate>
	<arriveOn>2020-10-30T19:41:32.770Z</arriveOn>
	<transitPlaces>
		<country>string</country>
		<city>string</city>
		<airport>string</airport>
		<arriveDate>2020-10-30T19:41:32.771Z</arriveDate>
		<takeOff>2020-10-30T19:41:32.771Z</takeOff>
	</transitPlaces>
	<company>string</company>
	<price>0</price>
</TicketCreateUpdateModel>

Reponse

Status Codes

201Created

Response body

content-type: application/json

{
  "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
  "countryFrom": "string",
  "cityFrom": "string",
  "countryTo": "string",
  "cityTo": "string",
  "takeOffDay": "2020-10-30T19:41:32.801Z",
  "takeOffDate": "2020-10-30T19:41:32.801Z",
  "arriveOn": "2020-10-30T19:41:32.801Z",
  "transitPlaces": [
    {
      "country": "string",
      "city": "string",
      "airport": "string",
      "arriveDate": "2020-10-30T19:41:32.801Z",
      "takeOff": "2020-10-30T19:41:32.801Z"
    }
  ],
  "company": "string",
  "price": 0
}

content-type: application/xml

	<?xml version="1.0" encoding="UTF-8"?>
<TicketModel>
	<id>3fa85f64-5717-4562-b3fc-2c963f66afa6</id>
	<countryFrom>string</countryFrom>
	<cityFrom>string</cityFrom>
	<countryTo>string</countryTo>
	<cityTo>string</cityTo>
	<takeOffDay>2020-10-30T19:44:17.945Z</takeOffDay>
	<takeOffDate>2020-10-30T19:44:17.945Z</takeOffDate>
	<arriveOn>2020-10-30T19:44:17.945Z</arriveOn>
	<transitPlaces>
		<country>string</country>
		<city>string</city>
		<airport>string</airport>
		<arriveDate>2020-10-30T19:44:17.946Z</arriveDate>
		<takeOff>2020-10-30T19:44:17.946Z</takeOff>
	</transitPlaces>
	<company>string</company>
	<price>0</price>
</TicketModel>

Change a Ticket's state

Request

PUT /api/tickets/ec25779a-c742-4a4e-be03-cf8aeec12490

Request Headers

content-type: application/json, application/xml

Request body

{
  "countryFrom": "string",
  "cityFrom": "string",
  "countryTo": "string",
  "cityTo": "string",
  "takeOffDay": "2020-10-30T19:54:33.531Z",
  "takeOffDate": "2020-10-30T19:54:33.532Z",
  "arriveOn": "2020-10-30T19:54:33.532Z",
  "transitPlaces": [
    {
      "country": "string",
      "city": "string",
      "airport": "string",
      "arriveDate": "2020-10-30T19:54:33.532Z",
      "takeOff": "2020-10-30T19:54:33.532Z"
    }
  ],
  "company": "string",
  "price": 0
}

Response

Status Codes

  • 204NoContent
  • 404NotFound

Delete a Ticket

Request

DELETE /api/tickets/ec25779a-c742-4a4e-be03-cf8aeec12490

Response

Status Codes

  • 204NoContent
  • 404NotFound

Warrants

Get Warrants by a passenger's iban

Request

GET /api/warrants?iban=string

Request Headers
  • accept: application/json, application/xml

Response

content-type: application/json

[
  {
    "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "passengerIban": "string",
    "passportId": "string",
    "ticketId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "ticketBackId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "isPaid": true
  }
]

content-type: application/xml

<ArrayOfWarrantModel xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/AviaSalesApiCopyTwo.Models.Warrants">
	<WarrantModel>
		<id>3fa85f64-5717-4562-b3fc-2c963f66afa6</id>
		<passengerIban>string</passengerIban>
		<passportId>string</passportId>
		<ticketId>3fa85f64-5717-4562-b3fc-2c963f66afa6</ticketId>
		<ticketBackId>3fa85f64-5717-4562-b3fc-2c963f66afa6</ticketBackId>
		<isPaid>true</isPaid>
	</WarrantModel>
</ArrayOfWarrantModel>
Status Codes

200OK

Get a Warrant by Id

Request

GET /api/warrants/ec25779a-c742-4a4e-be03-cf8aeec12490

Request Headers
  • accept: application/json, application/xml

Response

content-type: application/json

{
    "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "passengerIban": "string",
    "passportId": "string",
    "ticketId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "ticketBackId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "isPaid": true
  }

content-type: application/xml

	<?xml version="1.0" encoding="UTF-8"?>
	<WarrantModel>
		<id>3fa85f64-5717-4562-b3fc-2c963f66afa6</id>
		<passengerIban>string</passengerIban>
		<passportId>string</passportId>
		<ticketId>3fa85f64-5717-4562-b3fc-2c963f66afa6</ticketId>
		<ticketBackId>3fa85f64-5717-4562-b3fc-2c963f66afa6</ticketBackId>
		<isPaid>true</isPaid>
	</WarrantModel>
Status Codes
  • 200OK
  • 404NotFound

Create a new Warrant

Request

POST /api/warrants

Request Headers
  • accept: application/json, application/xml
  • content-type: application/json, application/xml
Request body

content-type: application/json

{
    "passengerIban": "string",
    "passportId": "string",
    "ticketId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "ticketBackId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "isPaid": true
 }

content-type: application/xml

	<?xml version="1.0" encoding="UTF-8"?>
	<WarrantModel>
		<passengerIban>string</passengerIban>
		<passportId>string</passportId>
		<ticketId>3fa85f64-5717-4562-b3fc-2c963f66afa6</ticketId>
		<ticketBackId>3fa85f64-5717-4562-b3fc-2c963f66afa6</ticketBackId>
		<isPaid>true</isPaid>
	</WarrantModel>

Response

content-type: application/json

{
    "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "passengerIban": "string",
    "passportId": "string",
    "ticketId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "ticketBackId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "isPaid": true
  }

content-type: application/xml

	<?xml version="1.0" encoding="UTF-8"?>
	<WarrantModel>
		<id>3fa85f64-5717-4562-b3fc-2c963f66afa6</id>
		<passengerIban>string</passengerIban>
		<passportId>string</passportId>
		<ticketId>3fa85f64-5717-4562-b3fc-2c963f66afa6</ticketId>
		<ticketBackId>3fa85f64-5717-4562-b3fc-2c963f66afa6</ticketBackId>
		<isPaid>true</isPaid>
	</WarrantModel>
Status Codes

201Created

Change a Warrant's state

Request

PUT /api/warrants/ec25779a-c742-4a4e-be03-cf8aeec12490

Request Headers

content-type: application/json, application/xml

Request Body

content-type: application/json

{
    "passengerIban": "string",
    "passportId": "string",
    "ticketId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "ticketBackId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    "isPaid": true
 }

content-type: application/xml

	<?xml version="1.0" encoding="UTF-8"?>
	<WarrantModel>
		<passengerIban>string</passengerIban>
		<passportId>string</passportId>
		<ticketId>3fa85f64-5717-4562-b3fc-2c963f66afa6</ticketId>
		<ticketBackId>3fa85f64-5717-4562-b3fc-2c963f66afa6</ticketBackId>
		<isPaid>true</isPaid>
	</WarrantModel>

Response

Status Codes
  • 204NoContent
  • 404NotFound

Delete Warrant

Request

DELETE /api/warrants/3fa85f64-5717-4562-b3fc-2c963f66afa6

Response

Status Codes
  • 204NoContent
  • 404NotFound

Get, Update or Delete a non-existing resource

Request

  • GET /api/{resource}/ec25779a-c742-4a4e-be03-cf8aeec12499
  • PUT /api/{resource}/ec25779a-c742-4a4e-be03-cf8aeec12499
  • DELETE /api/{resource}/ec25779a-c742-4a4e-be03-cf8aeec12499

Response

{
    "StatusCode": 404,
    "Error": "Entity of type {resource} with id: ec25779a-c742-4a4e-be03-cf8aeec12499 not found"
}

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