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Add TxMeta type #114

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merged 1 commit into from
Mar 26, 2019
Merged

Add TxMeta type #114

merged 1 commit into from
Mar 26, 2019

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akegalj
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@akegalj akegalj commented Mar 22, 2019 •
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Issue Number

#101

Overview

  • I have added initial version of TxMeta datatype

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Nothing has been wired yet. This just creates datatype that will be used later on. Datatype is not set in stone as well and might change

akegalj
akegalj commented Mar 22, 2019
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src/Cardano/Wallet/Primitive/Types.hs
{ metaId :: !(Hash "Tx")
-- FIXME: we might want to go for something more optimized than natural,
-- like Word64 ?
, depth :: !(Quantity "block" Natural)
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@akegalj akegalj Mar 22, 2019 •
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do we want to keep types in Primitives in their optimized form , thus opting for a bit more performant type like Word64?

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Optimizations between Natural vs Word64 is pointless at this stage. Writing an algorithm that goes in O(n²) will cause us some trouble. Using Natural instead of Word64 won't probably have any noticeable effects on a wallet.

If so, we should measure it first and have a baseline to compare with.

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I will leave it to Natural then because its a safer type. If there will be some evidence that this should be optimized more we can then measure and optimize

src/Cardano/Wallet/Primitive/Types.hs Outdated
-- part alltogether. Node/core bits would still work optimally with
-- Coin/Word64
-- but wallet bits could go a bit more abstract (and less optimized)?
, amount :: !Coin
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what about something less performant like Quantity "lovelace" Natural for representing coin in wallet?

EDIT: in fact ^ is probably a bad idea because exchanges are also our clients and we do want to have performant types in wallet

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I guess the amount is redundant with the transaction itself here. Not sure we do need to duplicate this information in the metadata.

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@akegalj akegalj Mar 26, 2019 •
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yes you are right - we can calculate this on demand. I thought this type will be used as a return type after calculation has been done already:

computeTxMeta :: Tx -> ... -> TxMeta

so in computeTxMeta we would calculate this amount. As I am not sure how this type will be used yet through the code - I can remove it untill its needed

src/Cardano/Wallet/Primitive/Types.hs
newtype Timestamp = Timestamp
-- NOTE: We could have gone for Microsecond from Data.Time.Units, but
-- it seems like an overkill for now
{ getTimestamp :: UTCTime
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in the old wallet we used Microsecond which at this point seems like not needed.

src/Cardano/Wallet/Primitive/Types.hs
@@ -1,6 +1,7 @@
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DerivingStrategies #-}
{-# LANGUAGE DuplicateRecordFields #-}
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as proposed by @KtorZ , we are going to try to use generic-lens and light lensing as described here https://hackage.haskell.org/package/generic-lens with as little as possible:

  • ^.
  • .~
  • %~

This is experimental

@akegalj akegalj mentioned this pull request Mar 22, 2019
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@akegalj akegalj marked this pull request as ready for review March 22, 2019 18:16
@KtorZ KtorZ force-pushed the master branch 2 times, most recently from 049fddd to a8d7c7d Compare March 23, 2019 12:45
KtorZ
KtorZ approved these changes Mar 25, 2019
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Some minor changes but over looks good 👍

src/Cardano/Wallet/Primitive/Types.hs
{ metaId :: !(Hash "Tx")
-- FIXME: we might want to go for something more optimized than natural,
-- like Word64 ?
, depth :: !(Quantity "block" Natural)
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Optimizations between Natural vs Word64 is pointless at this stage. Writing an algorithm that goes in O(n²) will cause us some trouble. Using Natural instead of Word64 won't probably have any noticeable effects on a wallet.

If so, we should measure it first and have a baseline to compare with.

src/Cardano/Wallet/Primitive/Types.hs Outdated
@@ -212,6 +220,30 @@ instance Buildable TxOut where
instance Buildable (TxIn, TxOut) where
build (txin, txout) = build txin <> " ==> " <> build txout

data TxMeta = TxMeta
{ metaId :: !(Hash "Tx")
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What about txId here? That's what it is in the end, right ?

src/Cardano/Wallet/Primitive/Types.hs Outdated
-- part alltogether. Node/core bits would still work optimally with
-- Coin/Word64
-- but wallet bits could go a bit more abstract (and less optimized)?
, amount :: !Coin
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I guess the amount is redundant with the transaction itself here. Not sure we do need to duplicate this information in the metadata.

@akegalj @paweljakubas
Add TxMeta type
bd6b33c 
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[101] Final polish of TxMeta type
paweljakubas
paweljakubas approved these changes Mar 26, 2019
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LGTM

@KtorZ KtorZ merged commit 6ccd314 into master Mar 26, 2019
@KtorZ KtorZ deleted the akegalj/101/tx-meta-type branch March 26, 2019 11:27
@paweljakubas paweljakubas mentioned this pull request Apr 2, 2019
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@KtorZ KtorZ KtorZ approved these changes

@paweljakubas paweljakubas paweljakubas approved these changes

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