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perf: parse chain-id from big genesis file could be slow #18204

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merged 28 commits into from
Oct 26, 2023
Merged

perf: parse chain-id from big genesis file could be slow #18204

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192261b
Problem: parse chain-id from big genesis file could be slow
yihuang Oct 23, 2023
7c59903
Update CHANGELOG.md
yihuang Oct 23, 2023
ee9b00a
fix unit test
yihuang Oct 23, 2023
567ee2d
patch the library to support early abort
yihuang Oct 23, 2023
55be3ec
add benchmarking
yihuang Oct 23, 2023
9c220f5
mention encoding/json/v2
yihuang Oct 23, 2023
c74ba3b
fix error handling
yihuang Oct 23, 2023
7680cdd
fix shadow var
yihuang Oct 23, 2023
1035e32
use simpler solution with different trade off
yihuang Oct 23, 2023
4677221
Merge branch 'main' into parse-chain-id
yihuang Oct 24, 2023
be3a3f7
cleanup
yihuang Oct 24, 2023
7cd0787
skip value more efficiently
yihuang Oct 24, 2023
c84599c
Merge branch 'main' into parse-chain-id
yihuang Oct 24, 2023
df3e2a3
trim space
yihuang Oct 25, 2023
3d7ef1a
trim space
yihuang Oct 25, 2023
b09130e
review suggestions
yihuang Oct 25, 2023
d52f3b6
assert error messages
yihuang Oct 25, 2023
1ad9a8f
Update types/chain_id.go
yihuang Oct 25, 2023
63b604c
use cronos mainnet genesis for benchmark
yihuang Oct 25, 2023
a4cc48a
fix conflicts
yihuang Oct 25, 2023
7a58af1
Merge branch 'main' into parse-chain-id
yihuang Oct 25, 2023
5147d1c
fix cyclic import
yihuang Oct 25, 2023
5d99b23
Merge branch 'main' into parse-chain-id
yihuang Oct 25, 2023
ba767d9
fix lint
yihuang Oct 25, 2023
2d3ba07
move directory
yihuang Oct 26, 2023
310b580
Merge branch 'main' into parse-chain-id
yihuang Oct 26, 2023
5145bac
Update x/genutil/types/chain_id.go
yihuang Oct 26, 2023
1bb078f
Merge branch 'main' into parse-chain-id
julienrbrt Oct 26, 2023
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -67,6 +67,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
* (rpc) [#17470](https://github.com/cosmos/cosmos-sdk/pull/17470) Avoid open 0.0.0.0 to public by default and add `listen-ip-address` argument for `testnet init-files` cmd.
* (types) [#17670](https://github.com/cosmos/cosmos-sdk/pull/17670) Use `ctx.CometInfo` in place of `ctx.VoteInfos`
* [#17733](https://github.com/cosmos/cosmos-sdk/pull/17733) Ensure `buf export` exports all proto dependencies
* [#18204](https://github.com/cosmos/cosmos-sdk/pull/18204) Use streaming json parser to parse chain-id from genesis file.

### Bug Fixes

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8 changes: 6 additions & 2 deletions server/util.go
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Original file line number Diff line number Diff line change
Expand Up @@ -485,12 +485,16 @@
chainID := cast.ToString(appOpts.Get(flags.FlagChainID))
if chainID == "" {
// fallback to genesis chain-id
appGenesis, err := genutiltypes.AppGenesisFromFile(filepath.Join(homeDir, "config", "genesis.json"))
reader, err := os.Open(filepath.Join(homeDir, "config", "genesis.json"))
Dismissed Show dismissed Hide dismissed
if err != nil {
panic(err)
}
defer reader.Close()

chainID = appGenesis.ChainID
chainID, err = genutiltypes.ParseChainIDFromGenesis(reader)
if err != nil {
panic(fmt.Errorf("failed to parse chain-id from genesis file: %w", err))
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}
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Comment on lines +488 to +497
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The new code introduces a more efficient way of parsing the chain_id from the genesis JSON file. Instead of loading the entire file into memory, it uses a streaming JSON parser to parse the file until the chain_id field is found. This approach significantly reduces memory usage and processing time. However, the use of panic for error handling is not recommended. It would be better to return the error to the caller and let it decide how to handle the error. This would make the code more robust and easier to debug.

- panic(err)
+ return "", fmt.Errorf("failed to open genesis file: %w", err)
- panic(fmt.Errorf("failed to parse chain-id from genesis file: %w", err))
+ return "", fmt.Errorf("failed to parse chain-id from genesis file: %w", err)
Committable suggestion (Beta)
Suggested change
reader, err := os.Open(filepath.Join(homeDir, "config", "genesis.json"))
if err != nil {
panic(err)
}
defer reader.Close()
chainID = appGenesis.ChainID
chainID, err = genutiltypes.ParseChainIDFromGenesis(reader)
if err != nil {
panic(fmt.Errorf("failed to parse chain-id from genesis file: %w", err))
}
chainID := cast.ToString(appOpts.Get(flags.FlagChainID))
if chainID == "" {
// fallback to genesis chain-id
reader, err := os.Open(filepath.Join(homeDir, "config", "genesis.json"))
if err != nil {
return "", fmt.Errorf("failed to open genesis file: %w", err)
}
defer reader.Close()
chainID, err = genutiltypes.ParseChainIDFromGenesis(reader)
if err != nil {
return "", fmt.Errorf("failed to parse chain-id from genesis file: %w", err)
}
}
snapshotStore, err := GetSnapshotStore(appOpts)

}

snapshotStore, err := GetSnapshotStore(appOpts)
Expand Down
69 changes: 69 additions & 0 deletions x/genutil/types/chain_id.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,69 @@
package types

import (
"encoding/json"
"errors"
"fmt"
"io"
"strings"

"github.com/cometbft/cometbft/types"
)

const ChainIDFieldName = "chain_id"

// ParseChainIDFromGenesis parses the `chain_id` from a genesis JSON file, aborting early after finding the `chain_id`.
// For efficiency, it's recommended to place the `chain_id` field before any large entries in the JSON file.
// Returns an error if the `chain_id` field is not found.
func ParseChainIDFromGenesis(r io.Reader) (string, error) {
dec := json.NewDecoder(r)

t, err := dec.Token()
if err != nil {
return "", err
}
if t != json.Delim('{') {
return "", fmt.Errorf("expected {, got %s", t)
}

for dec.More() {
t, err = dec.Token()
if err != nil {
return "", err
}
key, ok := t.(string)
if !ok {
return "", fmt.Errorf("expected string for the key type, got %s", t)
}

if key == ChainIDFieldName {
var chainId string
if err := dec.Decode(&chainId); err != nil {
return "", err
}
if err := validateChainID(chainId); err != nil {
return "", err
}
return chainId, nil
}

// skip the value
var value json.RawMessage
if err := dec.Decode(&value); err != nil {
return "", err
}
}

return "", errors.New("missing chain-id in genesis file")
}

func validateChainID(chainID string) error {
if strings.TrimSpace(chainID) == "" {
return errors.New("genesis doc must include non-empty chain_id")
}
if len(chainID) > types.MaxChainIDLen {
return fmt.Errorf("chain_id in genesis doc is too long (max: %d)", types.MaxChainIDLen)
}

return nil
}
130 changes: 130 additions & 0 deletions x/genutil/types/chain_id_test.go
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@@ -0,0 +1,130 @@
package types_test

import (
_ "embed"
"strings"
"testing"

"github.com/stretchr/testify/require"

"github.com/cosmos/cosmos-sdk/x/genutil/types"
)

//go:embed testdata/parse_chain_id.json
var BenchmarkGenesis string

func TestParseChainIDFromGenesis(t *testing.T) {
testCases := []struct {
name string
json string
expChainID string
expError string
}{
{
"success",
`{
"state": {
"accounts": {
"a": {}
}
},
"chain_id": "test-chain-id"
}`,
"test-chain-id",
"",
},
{
"nested",
`{
"state": {
"accounts": {
"a": {}
},
"chain_id": "test-chain-id"
}
}`,
"",
"missing chain-id in genesis file",
},
{
"not exist",
`{
"state": {
"accounts": {
"a": {}
}
},
"chain-id": "test-chain-id"
}`,
"",
"missing chain-id in genesis file",
},
{
"invalid type",
`{
"chain-id": 1,
}`,
"",
"invalid character '}' looking for beginning of object key string",
},
{
"invalid json",
`[ " ': }`,
"",
"expected {, got [",
},
{
"empty chain_id",
`{"chain_id": ""}`,
"",
"genesis doc must include non-empty chain_id",
},
{
"whitespace chain_id",
`{"chain_id": " "}`,
"",
"genesis doc must include non-empty chain_id",
},
{
"chain_id too long",
`{"chain_id": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"}`,
"",
"chain_id in genesis doc is too long",
},
}

for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
chain_id, err := types.ParseChainIDFromGenesis(strings.NewReader(tc.json))
if tc.expChainID == "" {
require.Error(t, err)
require.Contains(t, err.Error(), tc.expError)
} else {
require.NoError(t, err)
require.Equal(t, tc.expChainID, chain_id)
}
})
}
}
Comment on lines +16 to +108
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The test cases for TestParseChainIDFromGenesis are well-structured and cover a variety of scenarios, including successful parsing, missing chain_id, invalid JSON, and chain_id that is too long, empty, or contains only whitespace. This is a good practice as it ensures that the function behaves as expected in different situations. However, there is a minor issue with the error message checking. The test cases are checking for a substring of the error message, which might lead to false positives if the error messages are changed in the future. It would be better to compare the entire error message to ensure accuracy.


func BenchmarkParseChainID(b *testing.B) {
expChainID := "cronosmainnet_25-1"
b.ReportAllocs()
b.Run("new", func(b *testing.B) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
chainId, err := types.ParseChainIDFromGenesis(strings.NewReader(BenchmarkGenesis))
require.NoError(b, err)
require.Equal(b, expChainID, chainId)
}
})

b.Run("old", func(b *testing.B) {
b.ResetTimer()
for i := 0; i < b.N; i++ {
doc, err := types.AppGenesisFromReader(strings.NewReader(BenchmarkGenesis))
require.NoError(b, err)
require.Equal(b, expChainID, doc.ChainID)
}
})
}
1 change: 1 addition & 0 deletions x/genutil/types/testdata/parse_chain_id.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
{"genesis_time":"2021-11-08T01:00:00Z","chain_id":"cronosmainnet_25-1","initial_height":"1","consensus_params":{"block":{"max_bytes":"1048576","max_gas":"10000000","time_iota_ms":"1000"},"evidence":{"max_age_num_blocks":"403200","max_age_duration":"2419200000000000","max_bytes":"150000"},"validator":{"pub_key_types":["ed25519"]},"version":{}},"app_hash":"","app_state":{"auth":{"params":{"max_memo_characters":"256","tx_sig_limit":"7","tx_size_cost_per_byte":"10","sig_verify_cost_ed25519":"590","sig_verify_cost_secp256k1":"1000"},"accounts":[{"@type":"/ethermint.types.v1.EthAccount","base_account":{"address":"crc1q7q2mmmcx2nlw6ptw4a9a3danlnu8z6tq32gv9","pub_key":null,"account_number":"0","sequence":"0"},"code_hash":"0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"},{"@type":"/ethermint.types.v1.EthAccount","base_account":{"address":"crc1s8372smy0erx5k4usf84s39tpgy3kmrvjwdejw","pub_key":null,"account_number":"0","sequence":"0"},"code_hash":"0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"},{"@type":"/ethermint.types.v1.EthAccount","base_account":{"address":"crc1efw0q0ggzxtmuf80wpcgr77h70c3avpdp9nq5k","pub_key":null,"account_number":"0","sequence":"0"},"code_hash":"0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"},{"@type":"/ethermint.types.v1.EthAccount","base_account":{"address":"crc1f7r687vm68jc6qw7rsut07puh9n7s9kzdj0zph","pub_key":null,"account_number":"0","sequence":"0"},"code_hash":"0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"},{"@type":"/ethermint.types.v1.EthAccount","base_account":{"address":"crc1aaxs058pksrq8cx3k0nrxv60p2a9c7nq527949","pub_key":null,"account_number":"0","sequence":"0"},"code_hash":"0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"},{"@type":"/ethermint.types.v1.EthAccount","base_account":{"address":"crc17s50usvlr5934tr2fxsesr89k4twtm25vjl6zs","pub_key":null,"account_number":"0","sequence":"0"},"code_hash":"0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"},{"@type":"/ethermint.types.v1.EthAccount","base_account":{"address":"crc1tasmcx3rqpglmsafdt7vylnsdkc3yjlzfv3u63","pub_key":null,"account_number":"0","sequence":"0"},"code_hash":"0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"},{"@type":"/ethermint.types.v1.EthAccount","base_account":{"address":"crc17m20ajc6d7mu9j34q956q5x5sw7c0wyrem3s7n","pub_key":null,"account_number":"0","sequence":"0"},"code_hash":"0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"}]},"authz":{"authorization":[]},"bank":{"params":{"send_enabled":[{"denom":"stake","enabled":true},{"denom":"basecro","enabled":false}],"default_send_enabled":true},"balances":[{"address":"crc1q7q2mmmcx2nlw6ptw4a9a3danlnu8z6tq32gv9","coins":[{"denom":"stake","amount":"10000000000"}]},{"address":"crc1f7r687vm68jc6qw7rsut07puh9n7s9kzdj0zph","coins":[{"denom":"stake","amount":"10000000000"}]},{"address":"crc1tasmcx3rqpglmsafdt7vylnsdkc3yjlzfv3u63","coins":[{"denom":"stake","amount":"600000000000"}]},{"address":"crc1s8372smy0erx5k4usf84s39tpgy3kmrvjwdejw","coins":[{"denom":"stake","amount":"10000000000"}]},{"address":"crc1efw0q0ggzxtmuf80wpcgr77h70c3avpdp9nq5k","coins":[{"denom":"stake","amount":"10000000000"}]},{"address":"crc1aaxs058pksrq8cx3k0nrxv60p2a9c7nq527949","coins":[{"denom":"stake","amount":"10000"}]},{"address":"crc17s50usvlr5934tr2fxsesr89k4twtm25vjl6zs","coins":[{"denom":"stake","amount":"1000000000000000"}]},{"address":"crc17m20ajc6d7mu9j34q956q5x5sw7c0wyrem3s7n","coins":[{"denom":"stake","amount":"50000000"}]}],"supply":[{"denom":"stake","amount":"1000640050010000"}],"denom_metadata":[]},"capability":{"index":"1","owners":[]},"crisis":{"constant_fee":{"denom":"stake","amount":"1000"}},"cronos":{"params":{"ibc_cro_denom":"ibc/6411AE2ADA1E73DB59DB151A8988F9B7D5E7E233D8414DB6817F8F1A01611F86","ibc_timeout":"86400000000000","cronos_admin":"crc1tasmcx3rqpglmsafdt7vylnsdkc3yjlzfv3u63","enable_auto_deployment":false},"external_contracts":[],"auto_contracts":[]},"distribution":{"params":{"community_tax":"0","base_proposer_reward":"0","bonus_proposer_reward":"0","withdraw_addr_enabled":true},"fee_pool":{"community_pool":[]},"delegator_withdraw_infos":[],"previous_proposer":"","outstanding_rewards":[],"validator_accumulated_commissions":[],"validator_historical_rewards":[],"validator_current_rewards":[],"delegator_starting_infos":[],"validator_slash_events":[]},"evidence":{"evidence":[]},"evm":{"accounts":[],"params":{"evm_denom":"basecro","enable_create":true,"enable_call":true,"extra_eips":["2929","2200","1884","1344"],"chain_config":{"homestead_block":"0","dao_fork_block":"0","dao_fork_support":true,"eip150_block":"0","eip150_hash":"0x0000000000000000000000000000000000000000000000000000000000000000","eip155_block":"0","eip158_block":"0","byzantium_block":"0","constantinople_block":"0","petersburg_block":"0","istanbul_block":"0","muir_glacier_block":"0","berlin_block":"0","catalyst_block":null,"london_block":"9223372036854775808"}}},"feegrant":{"allowances":[]},"genutil":{"gen_txs":[{"body":{"messages":[{"@type":"/cosmos.staking.v1beta1.MsgCreateValidator","description":{"moniker":"Pioneer 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