-1

I was looking to work with a tool that would help me reflect transactions on my personal database. I was thinking of using demux but a lot of people suggested state history plugin. I want to know the difference between the two and when to choose either of them.

1

Overall:

Both state_history_plugin and demux can be used to cache the contract action data into database/memory for fast access in a structured manner.

State_History_Plugin:

State_history_plugin is block.one recommended plugin that comes with eosio setup which can be used to cache the full block information (i.e. inline action data) in file.

nodeos -e -p eosio --plugin eosio::producer_plugin --plugin eosio::chain_api_plugin --plugin eosio::http_plugin --plugin eosio::state_history_plugin --data-dir /Users/mydir/eosio/data --config-dir /Users/mydir/eosio/config --access-control-allow-origin='*' -- contracts-console -http-validate-host=false --state-history-dir /shpdata --trace-history --chain-state-history --verbose-http-errors --filter-on='*' --disable-replay-opts >> nodeos.log 2>&1 &

The nodeos command above adds the state history plugin --plugin eosio::state_history_plugin storing the chain data in a directory called /shpdata under the --data-dir --state-history-dir /shpdata storing both trace history and chain-state-history --trace-history --chain-state-history. To run the state history plugin you are required to --disable-replay-opts.

Once nodeos is running the state history plugin, you need to run fill-postgresql (or an alternative connector) to store the chain data in a postgresql database for querying.

You can store custom block data into postgresql database in custom structured manner.

Edit: State history plugin also provide Http RPC interface.

Demux:

Demux on the other hand is a open source module that can be integrated with application to fetch and filter information from block and store in any database you want in a traditional manner.

Only advantage of demux over state_history_plugin is that you can integrate any database with demux and can easily filter information in a traditional manner.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.