requirements.md

The Ethereum Fetcher - REST Server

Description & Requirements

Your task is to create a REST API server that returns information for certain Ethereum transactions identified by their transaction hashes.

Endpoint: /lime/eth/:rlphex

The server should handle a GET request on endpoint with path /lime/eth/:rlphex.

It should have a single parameter rlphex - a hexadecimal representation of RLP encoded list of transaction hashes (Example requests for the Goerli network are provided below). The server should return a response in the following format:

{
	transactions: [
		{ // List of information about transactions
			transactionHash: string, // the hex encoded transaction hash of the transaction
			transactionStatus: number, // the status of the transaction either 1 (success) or 0 (failure)
			blockHash: string, // the hex encoding of the hash of the block the transaction was included in
			blockNumber: number, // the number of the block the transaction was included in
			from: string, // the etherum address of the transaction sender
			to: string|null, // the etherum address of the transaction receiver or null when its a contract creation transaction.
			contractAddress: string|null, // the etherum address of the newly created contract if this transaction is contract creation
			logsCount: number, // number of log objects, which this transaction generated.
			input: string, // the hex encoding of the data send along with the transaction.
			value: string, // the value transferred in wei
		},
		{
			...
		}
	]
}

Saving information about fetched transactions in a database

Save the information for each transaction you’ve fetched from ethereum into a PostgreSQL database. Name the database postgres

Subsequent calls for this transaction identified by its hash should get the information from the database rather than the Ethereum node.

Important: Running the node should create the all the necessary the tables.

Endpoint: /lime/all

The server should handle a GET request at an endpoint named /lime/all . It should have no required parameters and return a list of all transactions saved in the database. The response format should be the same as /lime/eth/:rlphex.

Running the server

Environment variables

The server should support the following environmental variables:

• API_PORT - the port where the API will be listening for requests
• ETH_NODE_URL - url to an ethereum node that will be used for polling
• DB_CONNECTION_URL - url for connecting with your database

Any other environment variables you use should have default values and be optional!

Running and stopping the server

The server should be run by the following command:

Rust: cargo run

Node.js: npm start

Golang: go run .

Java: gradle run

The server should be stopped by sending it a kill signal or Ctrl+C.

Documentation

Replace this readme with documentation of the project outlining:

• Architecture of the server - design decisions and overview
• How to run the server
• Requests and responses (with examples)

Example requests and responses

The following requests-response pairs are expected on the Ethereum Goerli network:

Endpoint: /lime/eth/:rlphex

Request

curl -X GET http://127.0.0.1:{PORT}/lime/eth/f90110b842307839623266366133633265316165643263636366393262613636366332326430353361643064386135646137616131666435343737646364363537376234353234b842307835613537653330353163623932653264343832353135623037653762336431383531373232613734363534363537626436346131346333396361336639636632b842307837316239653262343464343034393863303861363239383866616337373664306561633062356239363133633337663966366639613462383838613862303537b842307863356639366266316235346433333134343235643233373962643737643765643465363434663763366538343961373438333230323862333238643464373938

Response

{
   "transactions":[
      {
         "transactionHash":"0x9b2f6a3c2e1aed2cccf92ba666c22d053ad0d8a5da7aa1fd5477dcd6577b4524",
         "transactionStatus":1,
         "blockHash":"0x3ac55cb392661e0d2239267022dc30f32dc4767cdacfd3e342443122b87101d3",
         "blockNumber":7976382,
         "from":"0xb4d6a98aa8cd5396069c2818adf4ae1a0384b43a",
         "to":null,
         "contractAddress":"0x3664f6c1178e19bb775b597d6584caa3b88a1c35",
         "input":"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         "value":"0"
      },
      {
         "transactionHash":"0x5a57e3051cb92e2d482515b07e7b3d1851722a74654657bd64a14c39ca3f9cf2",
         "transactionStatus":1,
         "blockHash":"0x92557f7e29c39cae6be013ffc817620fcd5233b68405cdfc6e0b5528261e81e5",
         "blockNumber":7976373,
         "from":"0xf29a6c0f8ee500dc87d0d4eb8b26a6fac7a76767",
         "to":"0xb0428bf0d49eb5c2239a815b43e59e124b84e303",
         "contractAddress":null,
         "logsCount":0,
         "input":"0x",
         "value":"50000000000000000"
      },
      {
         "transactionHash":"0x71b9e2b44d40498c08a62988fac776d0eac0b5b9613c37f9f6f9a4b888a8b057",
         "transactionStatus":1,
         "blockHash":"0x32edca7a39d0b1fc3d19fd1487c3c69beadad7cdcd5e5f1c9e815e7d1c460a0d",
         "blockNumber":7957369,
         "from":"0x22ba753ca065d65d4d0b9f4fac7a669746175199",
         "to":"0x14cb06e8de2222912138f9a062e5a4d9f4821409",
         "contractAddress":null,
         "logsCount":3,
         "input":"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",
         "value":"0"
      },
      {
         "transactionHash":"0xc5f96bf1b54d3314425d2379bd77d7ed4e644f7c6e849a74832028b328d4d798",
         "transactionStatus":0,
         "blockHash":"0x3ac55cb392661e0d2239267022dc30f32dc4767cdacfd3e342443122b87101d3",
         "blockNumber":7976382,
         "from":"0x58fa6ab2931b73a22d85617125b936bd3f74e765",
         "to":"0x302fd86163cb9ad5533b3952dafa3b633a82bc51",
         "contractAddress":null,
         "logsCount":0,
         "input":"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",
         "value":"1265249737905771"
      }
   ]
}

RPC: /lime/all

curl -X GET http://127.0.0.1:{PORT}/lime/all

{
      "transactions":[
         {
            "transactionHash":"0x9b2f6a3c2e1aed2cccf92ba666c22d053ad0d8a5da7aa1fd5477dcd6577b4524",
            "transactionStatus":1,
            "blockHash":"0x3ac55cb392661e0d2239267022dc30f32dc4767cdacfd3e342443122b87101d3",
            "blockNumber":7976382,
            "from":"0xb4d6a98aa8cd5396069c2818adf4ae1a0384b43a",
            "to":null,
            "contractAddress":"0x3664f6c1178e19bb775b597d6584caa3b88a1c35",
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}

Reading Materials & Resources

• Intro to Ethereum concepts - node, tx, address, ether and wei - https://ethereum.org/en/developers/docs/intro-to-ethereum/
• For access to ethereum Node one of the following two. Both of them have free versions:
  • Infura: https://www.infura.io/
  • Alchemy: https://www.alchemy.com/
• RLP - https://ethereum.org/en/developers/docs/data-structures-and-encoding/rlp/
• Ethereum JSONRPC - https://ethereum.org/en/developers/docs/apis/json-rpc/

[Optional] Rust

• Library for interaction with ethereum. Also contains common Ethereum types. https://github.com/gakonst/ethers-rs

[Optional] Node.js

• Library for interaction with ethereum. https://docs.ethers.io/v5/

[Optional] Golang

• Library for interaction with ethereum. Also contains common Ethereum types. https://pkg.go.dev/github.com/ethereum/go-ethereum#section-directories

[Optional] Java

• Library for interaction with ethereum. https://docs.web3j.io/4.8.7/

Senior Requirements

Endpoint /lime/authenticate

The server should handle a POST request on an endpoint named /lime/authenticate. The request body should be a JSON object containing the username and password. Upon sending correct username and password (list of usernames and passwords below), the server should respond with a JWT token. The response format should be

{
  token: string; // The JWT token for the user
}

The following user and password combinations should work:

• alice/ alice
• bob/ bob
• carol / carol
• dave/ dave

Endpoint Change: JWT for /lime/eth/:rlphex

Allow the /lime/eth/:rlphex to optionally have a header AUTH_TOKEN - the JWT token of a user. If the JWT token is provided, the server should “remember” that this user has asked for these specific transaction hashes. This will become important when we define /lime/my

Endpoint /lime/my

The server should handle a GET request on endpoint named /lime/my. It should have a single parameter in the header AUTH_TOKEN - the JWT token of the user. Upon success the server should return all the transactions that this user has ever asked for. The response format should be the same as /lime/eth/:rlphex.

Unit tests

Create a unit test suite that proves that:

• Your RLP decoding works
• Your database can store and retrieve data
• You are generating and decode JWT tokens correctly

The tests should be runnable via

Rust: cargo test

Node.js: npm test . Use the mocha framework for the unit testing.

Golang: go test

Java: gradle test

Dockerize your server

Add Dockerfile that builds an image of your server with tag limeapi. Your server should be runnable via docker run limeapi

Documentation

Improve your documentation with the changes for the modified api calls, how to run unit tests and docker work.

Architect Requirements

Documentation

Improve the documentation with:

• C4 diagrams of the application
• How would you improve the API? Reasoning around the design choices and tradeoffs
• Your strategy for Continuous Integration of the API
• Your strategy for Scalability of the service
• How would you approach making this service paid? How would the architecture change?
• How would you approach failing Ethereum Node URL?