https://github.com/fission-codes/ipfs-haskell

IPFS wrapper for Haskell
https://github.com/fission-codes/ipfs-haskell

content-addressing ipfs library

Last synced: 3 months ago
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IPFS wrapper for Haskell

• Host: GitHub
• URL: https://github.com/fission-codes/ipfs-haskell
• Owner: fission-codes
• License: apache-2.0
• Created: 2019-11-22T02:33:36.000Z (over 5 years ago)
• Default Branch: main
• Last Pushed: 2023-04-04T06:39:26.000Z (over 2 years ago)
• Last Synced: 2025-04-03T04:56:18.373Z (3 months ago)
• Topics: content-addressing, ipfs, library
• Language: Haskell
• Homepage: https://hackage.haskell.org/package/ipfs
• Size: 184 KB
• Stars: 43
• Watchers: 5
• Forks: 5
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE
  • Code of conduct: .github/CODE_OF_CONDUCT.md

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README

        
# ipfs-haskell

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Documentation: [ipfs on hackage](http://hackage.haskell.org/package/ipfs)

A library for integrating IPFS into your haskell applications. Interact with the IPFS network by shelling out to a local IPFS node or communicating via the HTTP interface of a remote node. 

# QuickStart

Define instances for `MonadLocalIPFS` and/or `MonadRemoteIPFS`. Each requires only one function:

```haskell

class Monad m => MonadRemoteIPFS m where

  runRemote :: Servant.ClientM a -> m (Either Servant.ClientError a)

class Monad m => MonadLocalIPFS m where

  runLocal ::

       [IPFS.Opt]

    -> Lazy.ByteString

    -> m (Either Process.Error Process.RawMessage)

```

We use RIO processes to shell out to a local IPFS node and Servant for HTTP requests to a remote node.

After that, simply add `MonadLocalIPFS m` as a constraint to a function and you'll be able to call IPFS within it.

For instance:

```haskell

import           Network.IPFS

import qualified Network.IPFS.Add        as IPFS

import           Network.IPFS.File.Types as File

add ::

  MonadLocalIPFS  m

  => File.Serialzed

  -> m ()

add (Serialized rawData) = IPFS.addRaw rawData >>= \case

  Right newCID -> 

    -- ...

  Left err ->

    -- ...

```

You can see example instances below:

```haskell

instance

  ( HasProcessContext cfg

  , HasLogFunc cfg

  , Has IPFS.BinPath cfg

  , Has IPFS.Timeout cfg

  )

  => MonadLocalIPFS (RIO cfg) where

    runLocal opts arg = do

      IPFS.BinPath ipfs <- view hasLens

      IPFS.Timeout secs <- view hasLens

      let opts' = ("--timeout=" <> show secs <> "s") : opts

      runProc readProcess ipfs (byteStringInput arg) byteStringOutput opts' >>= \case

        (ExitSuccess, contents, _) ->

          return $ Right contents

        (ExitFailure _, _, stdErr)

          | Lazy.isSuffixOf "context deadline exceeded" stdErr ->

              return . Left $ Process.Timeout secs

          | otherwise ->

            return . Left $ Process.UnknownErr stdErr

instance

  ( Has IPFS.URL     cfg

  , Has HTTP.Manager cfg

  )

  => MonadRemoteIPFS (RIO cfg) where

    runRemote query = do

      IPFS.URL url <- view hasLens

      manager      <- view hasLens

      url

        & mkClientEnv manager

        & runClientM query

        & liftIO

```