* perf: Improve the speed of coins.String() (#10076)
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## Description
Speedup coins.String() and coin.String()
In my local benchmarks, this >2x improves the time for balances with 1 coin, and further improves speed for strings with many balances. I did not benchmark on the two coin usecase
---
### Author Checklist
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please add links to any relevant follow up issues.*
I have...
- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [x] added `!` to the type prefix if API or client breaking change
- [x] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [x] provided a link to the relevant issue or specification - n/a
- [x] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [x] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing) - covered by existing
- [ ] added a changelog entry to `CHANGELOG.md`
- [x] included comments for [documenting Go code](https://blog.golang.org/godoc) - seems sufficiently clear
- [x] updated the relevant documentation or specification
- [x] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed
### Reviewers Checklist
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- [ ] confirmed `!` in the type prefix if API or client breaking change
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(cherry picked from commit 744c85b8fa
)
# Conflicts:
# CHANGELOG.md
* changelog
Co-authored-by: Dev Ojha <ValarDragon@users.noreply.github.com>
Co-authored-by: Federico Kunze Küllmer <federico.kunze94@gmail.com>
This commit is contained in:
parent
f67928a86d
commit
8ad8d5df4d
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@ -47,6 +47,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
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### Improvements
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* (store) [\#10741](https://github.com/cosmos/cosmos-sdk/pull/10741) Significantly speedup iterator creation after delete heavy workloads. Significantly improves IBC migration times.
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* (types) [\#10076](https://github.com/cosmos/cosmos-sdk/pull/10076) Significantly speedup and lower allocations for `Coins.String()`.
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### Bug Fixes
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@ -34,7 +34,7 @@ func NewInt64Coin(denom string, amount int64) Coin {
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// String provides a human-readable representation of a coin
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func (coin Coin) String() string {
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return fmt.Sprintf("%v%v", coin.Amount, coin.Denom)
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return fmt.Sprintf("%v%s", coin.Amount, coin.Denom)
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}
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// Validate returns an error if the Coin has a negative amount or if
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@ -190,13 +190,18 @@ func (coins Coins) MarshalJSON() ([]byte, error) {
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func (coins Coins) String() string {
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if len(coins) == 0 {
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return ""
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} else if len(coins) == 1 {
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return coins[0].String()
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}
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out := ""
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for _, coin := range coins {
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out += fmt.Sprintf("%v,", coin.String())
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// Build the string with a string builder
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var out strings.Builder
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for _, coin := range coins[:len(coins)-1] {
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out.WriteString(coin.String())
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out.WriteByte(',')
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}
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return out[:len(out)-1]
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out.WriteString(coins[len(coins)-1].String())
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return out.String()
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}
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// Validate checks that the Coins are sorted, have positive amount, with a valid and unique
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