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https://github.com/kremalicious/metamask-extension.git
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c7fad8f400
Refs #8572
Refs #8991
This change limits the number of transactions (`txMeta`s) that are passed
outside of the `TransactionController`, resulting in shorter serialization and
deserialization times when state is moved between the background and UI
contexts.
`TransactionController#_updateMemstore`
---------------------------------------
The `currentNetworkTxList` state of the `TransactionController` is used
externally (i.e. outside of the controller) as the canonical source for
the full transaction history. Prior to this change, the method would iterate
the full transaction history and possibly return all of it.
This change limits it to `MAX_MEMSTORE_TX_LIST_SIZE` to make sure that:
1. Calls to `_updateMemstore` are fast(er)
2. Passing `currentNetworkTxList` around is fast(er)
(Shown in #8377, `_updateMemstore`, is called _frequently_ when a transaction
is pending.)
The list is iterated backwards because it is possible that new transactions are
at the end of the list. [1]
Results
-------
In profiles before this change, with ~3k transactions locally,
`PortDuplexStream._onMessage` took up to ~4.5s to complete when the set of
transactions is included. [2]
In profiles after this change, `PortDuplexStream._onMessage` took ~90ms to
complete. [3]
Before vs. after profile screenshots:
![Profile 1][2]
![Profile 2][3]
[1]:
|
||
|---|---|---|
| .. | ||
| lib | ||
| enums.js | ||
| index.js | ||
| pending-tx-tracker.js | ||
| README.md | ||
| tx-gas-utils.js | ||
| tx-state-manager.js | ||
Transaction Controller
Transaction Controller is an aggregate of sub-controllers and trackers exposed to the MetaMask controller.
- txStateManager responsible for the state of a transaction and storing the transaction
- pendingTxTracker watching blocks for transactions to be include and emitting confirmed events
- txGasUtil gas calculations and safety buffering
- nonceTracker calculating nonces
Flow diagram of processing a transaction
txMeta's & txParams
A txMeta is the "meta" object it has all the random bits of info we need about a transaction on it. txParams are sacred every thing on txParams gets signed so it must be a valid key and be hex prefixed except for the network number. Extra stuff must go on the txMeta!
Here is a txMeta too look at:
txMeta = {
"id": 2828415030114568, // unique id for this txMeta used for look ups
"time": 1524094064821, // time of creation
"status": "confirmed",
"metamaskNetworkId": "1524091532133", //the network id for the transaction
"loadingDefaults": false, // used to tell the ui when we are done calculatyig gass defaults
"txParams": { // the txParams object
"from": "0x8acce2391c0d510a6c5e5d8f819a678f79b7e675",
"to": "0x8acce2391c0d510a6c5e5d8f819a678f79b7e675",
"value": "0x0",
"gasPrice": "0x3b9aca00",
"gas": "0x7b0c",
"nonce": "0x0"
},
"history": [
{ // debug information
"id": 2828415030114568,
"time": 1524094064821,
"status": "unapproved",
"metamaskNetworkId": "1524091532133",
"loadingDefaults": true,
"txParams": {
"from": "0x8acce2391c0d510a6c5e5d8f819a678f79b7e675",
"to": "0x8acce2391c0d510a6c5e5d8f819a678f79b7e675",
"value": "0x0"
}
},
[{
"op": "add",
"path": "/txParams/gasPrice",
"value": "0x3b9aca00"
}]
], // I've removed most of history for this
"origin": "MetaMask", //debug
"nonceDetails": {
"params": {
"highestLocallyConfirmed": 0,
"highestSuggested": 0,
"nextNetworkNonce": 0
},
"local": {
"name": "local",
"nonce": 0,
"details": {
"startPoint": 0,
"highest": 0
}
},
"network": {
"name": "network",
"nonce": 0,
"details": {
"baseCount": 0
}
}
},
"rawTx": "0xf86980843b9aca00827b0c948acce2391c0d510a6c5e5d8f819a678f79b7e67580808602c5b5de66eea05c01a320b96ac730cb210ca56d2cb71fa360e1fc2c21fa5cf333687d18eb323fa02ed05987a6e5fd0f2459fcff80710b76b83b296454ad9a37594a0ccb4643ea90", // used for rebroadcast
"hash": "0xa45ba834b97c15e6ff4ed09badd04ecd5ce884b455eb60192cdc73bcc583972a",
"submittedTime": 1524094077902 // time of the attempt to submit the raw tx to the network, used in the ui to show the retry button
}