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Build your own Redis

Learn about TCP servers, the Redis protocol and more

This challenge is free until 8 March 2024!

Redis is an in-memory data structure store often used as a database, cache, message broken and streaming engine. In this challenge you'll build your own Redis server that is capable of serving basic commands, reading RDB files and more.

Along the way, you'll learn about TCP servers, the Redis Protocol and more.

Stages

Bind to a port
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Respond to PING
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Respond to multiple PINGs
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Handle concurrent clients
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Implement the ECHO command
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Implement the SET & GET commands
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Expiry
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Replication

Configure listening port
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The INFO command
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The INFO command on a replica
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Initial Replication ID and Offset
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Send handshake (1/3)
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Send handshake (2/3)
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Send handshake (3/3)
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Receive handshake (1/2)
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Receive handshake (2/2)
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Empty RDB Transfer
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Single-replica propagation
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Multi Replica Command Propagation
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Command Processing
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ACKs with no commands
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ACKs with commands
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WAIT with no replicas
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WAIT with no commands
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WAIT with multiple commands
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RDB Persistence

RDB file config
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Read a key
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Read a string value
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Read multiple keys
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Read multiple string values
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Read value with expiry
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Streams

The TYPE command
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Create a stream
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Validating entry IDs
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Partially auto-generated IDs
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Fully auto-generated IDs
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Query entries from stream
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Query with -
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Query with +
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Query single stream using XREAD
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Query multiple streams using XREAD
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Blocking reads
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Blocking reads without timeout
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Blocking reads using $
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