key-val

About

Simple server in C that sits at 8080 port, serves like in-memory key-value db. It has folowing commands:

• "write key value ttl" writes or overwrites key with value, saving timestamp, ttl optional
• "add key value ttl" writes key with value, saving timestamp, but not overwrites it, ttl optional
• "update key value ttl" overwrites key with value, saving timestamp, but not add it, ttl optional
• "search key" searches value by the key
• "dump index offset" dupms what is in table from index to offset, if there are buckets there. Just "dump" returns first INITIAL_CAPACITY indexes.
• "wipe" drops everyting
• "size" show amount of key-values pairs and current hash table reserved
• "delete key" deletes the key
• "quit" close the connection.

Data model

Hash table, that stores key, it's hash, value and creation timestamp in a buckets linked to the table row.

ToDo

• Configfile, cli keys
• Persistence (yet need to choose strategy, Periodic Snapshots + WAL maybe?)
• Simple master-master replication with Last-Write-Wins (LWW) strategy
• Dokerise
• Test automations
• Consistent logging.

Known problems

• if client don't read socket but spams commands, servers segfaults. Yeah, that's the big one problem.