miliox / distcalc

Distributed Ruby Calculator

• 👋 Hi, I’m Emiliano Firmino (Miliox)
• 👀 I’m interested in low level programming, emulators, and operation systems.
• 🌱 I’m currently learning rust, and safety programming.
• 💞️ I’m looking to collaborate on projects that match my interests.
• 📫 How to reach me over Twitter @EmilianoFirmino.

distcalc's Issues

Evaluate natural math expression

Process a string containing a math expression wrote in infix notation with support to +,-,*,/ and parentheses; number are integers.

• Tokenize string to identify numbers, operators and ignore white spaces
• Convert infix notation to postfix notation
• Evaluate postfix notation
• Show result on screen
• Support unary operation for positive and negative number at start of expression

Example:
expression "-1 + 3 - 2 * (2 + 3)" evaluated to -8

Remote calculate a math expression

Change echo client-server application to remote calculator application.

• Pass math expression as argument
• Implement server side of remote calculator protocol
• Implement client side of remote calculator protocol
• Handle connection issues and expression errors
• Show result of evaluated expression

Distributed calculator operation

Change local binary operation evaluation (addition, subtraction, multiplication and division) to remote calls to operator evaluator server via calculator-evaluator protocol.

• Load available operators protocol YAML file
• Implement Calculator-Evaluator protocol on Calculator Server
• Implement Calculator-Evaluator protocol on Evaluator Server
• Handle connection errors, math errors and timeout
• Replace local operator evaluation by remote operator evaluation

Only first operation is executed in remote calculator

For some reason only the first operation is executed in distcalc server.

Launch calculator client via command line

Replace interpreter api by command line api as Specified in README.

• Use a 3rd party library to handle command line
• Validate arguments
• Support pass math expression using stdin
• Use default argument when undefined
• Show usage when have no arguments
• Show result or errors

Launch calculator server via command line

Replace interpreter api by command line api as specified in README.

• Use same library of client cli
• Validate arguments
• Support pass configuration file by stdin
• Use default argument when undefined
• Show usage when have no arguments
• Print trace information when on verbose mode

Launch operation evaluator via command line

Replace interpreter api by command line api as specified in README.

• Use same library of client cli
• Validate arguments
• Use default argument when undefined
• Show usage when have no arguments
• Print trace information when on verbose mode

Echo tcp server and client

Write in ruby a client-server echo application.

Client:

• Open a tcp client connection
• Send a string to server
• Wait for response
• Print result on screen

Server:

• Listen for tcp connection
• Accept connection
• Launch a worker to handle accepted connection
• Receive tcp packet from client
• Send received packets to client

All process should be logged using a 3rd party logging library to support verbose mode.

Specification of operation evaluator protocol

Define communication protocol between remote calculator and operation evaluator that process binary operation (add,subtraction,multiplication and division).

• Yaml encoded
• Support Math errors (Division by zero, Overflow, Underflow)
• Transfer Operands and Result
• Check requested operation is supported on server
• Request Header
• Request Content
• Response Header
• Response Content
• Validate content using checksum
• Content length in header

Log System for Debug and Trace

A log system defined using parameter verbose

Specification of remote calculator protocol

Write specification of remote calculator used on communication between client and server distcalc applications.

Specification must contains:

• request header format spec.
• request content format spec.
• response header format spec
• response content format spec.
• notify error or success in expression evaluation
• support error description
• guarantee integrity of content using checksum
• support content length to avoid buffer error
• use YAML to content encoding