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Deal Filters

How to use deal filters

Using filters for fine-grained storage and retrieval deal acceptance

Your use case might demand very precise and dynamic control over a combination of deal parameters.
Lotus provides two IPC hooks allowing you to name a command to execute for every deal before the miner accepts it:
  • Filter for storage deals.
  • RetrievalFilter for retrieval deals.
The executed command receives a JSON representation of the deal parameters on standard input, and upon completion, its exit code is interpreted as:
  • 0: success, proceed with the deal.
  • non-0: failure, reject the deal.
The most trivial filter rejecting any retrieval deal would be something like: RetrievalFilter = "/bin/false". /bin/false is binary that immediately exits with a code of 1.
This Perl script lets the miner deny specific clients and only accept deals that are set to start relatively soon.
You can also use a third party content policy framework like CIDgravity or bitscreen by Murmuration Labs:
# grab filter program
go get -u -v github.com/Murmuration-Labs/bitscreen
# add it to both filters
Filter = "/path/to/go/bin/bitscreen"
RetrievalFilter = "/path/to/go/bin/bitscreen"