-
Notifications
You must be signed in to change notification settings - Fork 3.6k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
add section on creating a testnets from mainnet exports
- Loading branch information
1 parent
4db9838
commit 4d1ee7c
Showing
1 changed file
with
235 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,235 @@ | ||
| --- | ||
| sidebar_position: 1 | ||
| --- | ||
|
|
||
| # Application Testnets | ||
|
|
||
| Building an application is complicated and requires a lot of testing. The Cosmos SDK provides a way to test your application in a real-world environment: a testnet. | ||
|
|
||
| We allow developers to take the state from their mainnet and run tests against the state. This is useful for testing upgrade migrations, or for testing the application in a real-world environment. | ||
|
|
||
| ## Testnet Setup | ||
|
|
||
| We will be breaking down the steps to create a testnet from mainnet state. | ||
|
|
||
| ```go | ||
| // InitMerlinAppForTestnet is broken down into two sections: | ||
| // Required Changes: Changes that, if not made, will cause the testnet to halt or panic | ||
| // Optional Changes: Changes to customize the testnet to one's liking (lower vote times, fund accounts, etc) | ||
| func InitMerlinAppForTestnet(app *MerlinApp, newValAddr bytes.HexBytes, newValPubKey crypto.PubKey, newOperatorAddress, upgradeToTrigger string) *MerlinApp { | ||
| ... | ||
| } | ||
| ``` | ||
|
|
||
| ### Required Changes | ||
|
|
||
| #### Staking | ||
|
|
||
| When creating a testnet the important part is migrate the validator set from many validators to one or a few. This allows developers to spin up the chain without needing to replace validator keys. | ||
|
|
||
| ```go | ||
| ctx := app.BaseApp.NewUncachedContext(true, tmproto.Header{}) | ||
| pubkey := &ed25519.PubKey{Key: newValPubKey.Bytes()} | ||
| pubkeyAny, err := types.NewAnyWithValue(pubkey) | ||
| if err != nil { | ||
| tmos.Exit(err.Error()) | ||
| } | ||
|
|
||
| // STAKING | ||
| // | ||
|
|
||
| // Create Validator struct for our new validator. | ||
| _, bz, err := bech32.DecodeAndConvert(newOperatorAddress) | ||
| if err != nil { | ||
| tmos.Exit(err.Error()) | ||
| } | ||
| bech32Addr, err := bech32.ConvertAndEncode("merlinvaloper", bz) | ||
| if err != nil { | ||
| tmos.Exit(err.Error()) | ||
| } | ||
| newVal := stakingtypes.Validator{ | ||
| OperatorAddress: bech32Addr, | ||
| ConsensusPubkey: pubkeyAny, | ||
| Jailed: false, | ||
| Status: stakingtypes.Bonded, | ||
| Tokens: sdk.NewInt(900000000000000), | ||
| DelegatorShares: sdk.MustNewDecFromStr("10000000"), | ||
| Description: stakingtypes.Description{ | ||
| Moniker: "Testnet Validator", | ||
| }, | ||
| Commission: stakingtypes.Commission{ | ||
| CommissionRates: stakingtypes.CommissionRates{ | ||
| Rate: sdk.MustNewDecFromStr("0.05"), | ||
| MaxRate: sdk.MustNewDecFromStr("0.1"), | ||
| MaxChangeRate: sdk.MustNewDecFromStr("0.05"), | ||
| }, | ||
| }, | ||
| MinSelfDelegation: sdk.OneInt(), | ||
| } | ||
|
|
||
| // Remove all validators from power store | ||
| stakingKey := app.GetKey(stakingtypes.ModuleName) | ||
| stakingStore := ctx.KVStore(stakingKey) | ||
| iterator := app.StakingKeeper.ValidatorsPowerStoreIterator(ctx) | ||
| for ; iterator.Valid(); iterator.Next() { | ||
| stakingStore.Delete(iterator.Key()) | ||
| } | ||
| iterator.Close() | ||
|
|
||
| // Remove all valdiators from last validators store | ||
| iterator = app.StakingKeeper.LastValidatorsIterator(ctx) | ||
| for ; iterator.Valid(); iterator.Next() { | ||
| stakingStore.Delete(iterator.Key()) | ||
| } | ||
| iterator.Close() | ||
|
|
||
| // Add our validator to power and last validators store | ||
| app.StakingKeeper.SetValidator(ctx, newVal) | ||
| err = app.StakingKeeper.SetValidatorByConsAddr(ctx, newVal) | ||
| if err != nil { | ||
| tmos.Exit(err.Error()) | ||
| } | ||
| app.StakingKeeper.SetValidatorByPowerIndex(ctx, newVal) | ||
| app.StakingKeeper.SetLastValidatorPower(ctx, newVal.GetOperator(), 0) | ||
| if err := app.StakingKeeper.Hooks().AfterValidatorCreated(ctx, newVal.GetOperator()); err != nil { | ||
| panic(err) | ||
| } | ||
| ``` | ||
|
|
||
| #### Distribution | ||
|
|
||
| Since the validator set has changed, we need to update the distribution records for the new validator. | ||
|
|
||
|
|
||
| ```go | ||
| // Initialize records for this validator across all distribution stores | ||
| app.DistrKeeper.SetValidatorHistoricalRewards(ctx, newVal.GetOperator(), 0, distrtypes.NewValidatorHistoricalRewards(sdk.DecCoins{}, 1)) | ||
| app.DistrKeeper.SetValidatorCurrentRewards(ctx, newVal.GetOperator(), distrtypes.NewValidatorCurrentRewards(sdk.DecCoins{}, 1)) | ||
| app.DistrKeeper.SetValidatorAccumulatedCommission(ctx, newVal.GetOperator(), distrtypes.InitialValidatorAccumulatedCommission()) | ||
| app.DistrKeeper.SetValidatorOutstandingRewards(ctx, newVal.GetOperator(), distrtypes.ValidatorOutstandingRewards{Rewards: sdk.DecCoins{}}) | ||
| ``` | ||
|
|
||
| #### Slashing | ||
|
|
||
| We also need to set the validator signing info for the new validator. | ||
|
|
||
| ```go | ||
| // SLASHING | ||
| // | ||
|
|
||
| // Set validator signing info for our new validator. | ||
| newConsAddr := sdk.ConsAddress(newValAddr.Bytes()) | ||
| newValidatorSigningInfo := slashingtypes.ValidatorSigningInfo{ | ||
| Address: newConsAddr.String(), | ||
| StartHeight: app.LastBlockHeight() - 1, | ||
| Tombstoned: false, | ||
| } | ||
| app.SlashingKeeper.SetValidatorSigningInfo(ctx, newConsAddr, newValidatorSigningInfo) | ||
| ``` | ||
|
|
||
| #### Bank | ||
|
|
||
| It is useful to create new accounts for your testing purposes. This avoids the need to have the same key as you may have on mainnet. | ||
|
|
||
| ```go | ||
| // BANK | ||
| // | ||
|
|
||
| defaultCoins := sdk.NewCoins(sdk.NewInt64Coin("umerlin", 1000000000000)) | ||
|
|
||
| localMerlinAccounts := []sdk.AccAddress{ | ||
| sdk.MustAccAddressFromBech32("merlin12smx2wdlyttvyzvzg54y2vnqwq2qjateuf7thj"), | ||
| sdk.MustAccAddressFromBech32("merlin1cyyzpxplxdzkeea7kwsydadg87357qnahakaks"), | ||
| sdk.MustAccAddressFromBech32("merlin18s5lynnmx37hq4wlrw9gdn68sg2uxp5rgk26vv"), | ||
| sdk.MustAccAddressFromBech32("merlin1qwexv7c6sm95lwhzn9027vyu2ccneaqad4w8ka"), | ||
| sdk.MustAccAddressFromBech32("merlin14hcxlnwlqtq75ttaxf674vk6mafspg8xwgnn53"), | ||
| sdk.MustAccAddressFromBech32("merlin12rr534cer5c0vj53eq4y32lcwguyy7nndt0u2t"), | ||
| sdk.MustAccAddressFromBech32("merlin1nt33cjd5auzh36syym6azgc8tve0jlvklnq7jq"), | ||
| sdk.MustAccAddressFromBech32("merlin10qfrpash5g2vk3hppvu45x0g860czur8ff5yx0"), | ||
| sdk.MustAccAddressFromBech32("merlin1f4tvsdukfwh6s9swrc24gkuz23tp8pd3e9r5fa"), | ||
| sdk.MustAccAddressFromBech32("merlin1myv43sqgnj5sm4zl98ftl45af9cfzk7nhjxjqh"), | ||
| sdk.MustAccAddressFromBech32("merlin14gs9zqh8m49yy9kscjqu9h72exyf295afg6kgk"), | ||
| sdk.MustAccAddressFromBech32("merlin1jllfytsz4dryxhz5tl7u73v29exsf80vz52ucc")} | ||
|
|
||
| // Fund localMerlin accounts | ||
| for _, account := range localMerlinAccounts { | ||
| err := app.BankKeeper.MintCoins(ctx, minttypes.ModuleName, defaultCoins) | ||
| if err != nil { | ||
| tmos.Exit(err.Error()) | ||
| } | ||
| err = app.BankKeeper.SendCoinsFromModuleToAccount(ctx, minttypes.ModuleName, account, defaultCoins) | ||
| if err != nil { | ||
| tmos.Exit(err.Error()) | ||
| } | ||
| } | ||
| ``` | ||
|
|
||
| #### Upgrade | ||
|
|
||
| If you would like to schedule an upgrade the below can be used. | ||
|
|
||
| ```go | ||
| // UPGRADE | ||
| // | ||
|
|
||
| if upgradeToTrigger != "" { | ||
| upgradePlan := upgradetypes.Plan{ | ||
| Name: upgradeToTrigger, | ||
| Height: app.LastBlockHeight(), | ||
| } | ||
| err = app.UpgradeKeeper.ScheduleUpgrade(ctx, upgradePlan) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
| ``` | ||
|
|
||
| ### Optional Changes | ||
|
|
||
| If you have custom modules that rely on specific state from the above modules and/or you would like to test your custom module, you will need to update the state of your custom module to reflect your needs | ||
|
|
||
| ## Running the Testnet | ||
|
|
||
| Before we can run the testnet we must plug everything together. | ||
|
|
||
| in `root.go`, in the `initRootCmd` function we add: | ||
|
|
||
| ```go | ||
| server.AddCommands(rootCmd, merlin.DefaultNodeHome, newApp, createMerlinAppAndExport, addModuleInitFlags) | ||
| ++ server.AddTestnetCreatorCommand(rootCmd, merlin.DefaultNodeHome, newTestnetApp, addModuleInitFlags) | ||
| ``` | ||
|
|
||
| Next we will add a newTestnetCommand helper function: | ||
|
|
||
| ```go | ||
| // newTestnetApp starts by running the normal newApp method. From there, the app interface returned is modified in order | ||
| // for a testnet to be created from the provided app. | ||
| func newTestnetApp(logger log.Logger, db cometbftdb.DB, traceStore io.Writer, appOpts servertypes.AppOptions) servertypes.Application { | ||
| // Create an app and type cast to an MerlinApp | ||
| app := newApp(logger, db, traceStore, appOpts) | ||
| merlinApp, ok := app.(*merlin.MerlinApp) | ||
| if !ok { | ||
| panic("app created from newApp is not of type merlinApp") | ||
| } | ||
|
|
||
| newValAddr, ok := appOpts.Get(server.KeyNewValAddr).(bytes.HexBytes) | ||
| if !ok { | ||
| panic("newValAddr is not of type bytes.HexBytes") | ||
| } | ||
| newValPubKey, ok := appOpts.Get(server.KeyUserPubKey).(crypto.PubKey) | ||
| if !ok { | ||
| panic("newValPubKey is not of type crypto.PubKey") | ||
| } | ||
| newOperatorAddress, ok := appOpts.Get(server.KeyNewOpAddr).(string) | ||
| if !ok { | ||
| panic("newOperatorAddress is not of type string") | ||
| } | ||
| upgradeToTrigger, ok := appOpts.Get(server.KeyTriggerTestnetUpgrade).(string) | ||
| if !ok { | ||
| panic("upgradeToTrigger is not of type string") | ||
| } | ||
|
|
||
| // Make modifications to the normal MerlinApp required to run the network locally | ||
| return meriln.InitMerlinAppForTestnet(merlinApp, newValAddr, newValPubKey, newOperatorAddress, upgradeToTrigger) | ||
| } | ||
| ``` |