add some info for separate compose and execute commands; note about
flaky test
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@ -108,11 +108,15 @@ These commands are described in detail [here](../staging/documentation/sync.md).
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### Data transformation
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Contract watchers use the raw data that has been synced into Postgres to filter out and apply transformations to specific data of interest.
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There is a built-in `contractWatcher` command which provides generic transformation of most contract data. This command is described in detail [here](../staging/documentation/contractWatcher.md).
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There is a built-in `contractWatcher` command which provides generic transformation of most contract data.
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The `contractWatcher` command is described further [here](../staging/documentation/contractWatcher.md).
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In many cases a custom transformer or set of transformers will need to be written to provide complete or more comprehensive coverage or to optimize other aspects of the output for a specific end-use.
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In this case we have provided the `compose`, `execute`, and `composeAndExecute` commands for running custom transformers from external repositories. This is described in detail [here](../staging/documentation/composeAndExecute.md).
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In this case we have provided the `compose`, `execute`, and `composeAndExecute` commands for running custom transformers from external repositories.
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Usage of the `compose`, `execute`, and `composeAndExecute` commands is described further [here](../staging/documentation/composeAndExecute.md).
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Documentation on how to build custom transformers to work with these commands can be found [here](../staging/documentation/transformers.md).
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## Tests
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- Replace the empty `ipcPath` in the `environments/infura.toml` with a path to a full node's eth_jsonrpc endpoint (e.g. local geth node ipc path or infura url)
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@ -3,48 +3,42 @@ The `composeAndExecute` command is used to compose and execute over an arbitrary
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This is accomplished by generating a Go pluggin which allows the `vulcanizedb` binary to link to external transformers, so
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long as they abide by one of the standard [interfaces](../staging/libraries/shared/transformer).
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This command requires Go 1.11+ and [Go plugins](https://golang.org/pkg/plugin/) only work on Unix-based systems.
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Additionally, there are separate `compose` and `execute` commands to allow pre-building and linking to a pre-built .so file.
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## Writing custom transformers
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Storage Transformers
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* [Guide](../../staging/libraries/shared/factories/storage/README.md)
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* [Example](../../staging/libraries/shared/factories/storage/EXAMPLE.md)
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Event Transformers
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* [Guide](../../staging/libraries/shared/factories/event/README.md)
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* [Example 1](https://github.com/vulcanize/ens_transformers/tree/master/transformers/registar)
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* [Example 2](https://github.com/vulcanize/ens_transformers/tree/master/transformers/registry)
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* [Example 3](https://github.com/vulcanize/ens_transformers/tree/master/transformers/resolver)
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**NOTE:**
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1. It is necessary that the .so file was built with the same exact dependencies that are present in the execution environment,
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i.e. we need to `compose` and `execute` the plugin .so file with the same exact version of vulcanizeDB.
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1. The plugin migrations are run during the plugin's composition. As such, if `execute` is used to run a prebuilt .so in a different
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environment than the one it was composed in then the migrations for that plugin will first need to be manually ran against that environment's Postgres database.
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Contract Transformers
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* [Example 1](https://github.com/vulcanize/account_transformers)
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* [Example 2](https://github.com/vulcanize/ens_transformers/tree/master/transformers/domain_records)
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These commands require Go 1.11+ and use [Go plugins](https://golang.org/pkg/plugin/) which only work on Unix-based systems.
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There is also an ongoing [conflict](https://github.com/golang/go/issues/20481) between Go plugins and the use vendored dependencies which
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imposes certain limitations on how the plugins are built.
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## Preparing transformers to work as a plugin for composeAndExecute
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To plug in an external transformer we need to:
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## Commands
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The `compose` and `composeAndExecute` commands assume you are in the vulcanizdb directory located at your system's `$GOPATH`,
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and that all of the transformer repositories for building the plugin are present at their `$GOPATH` directories.
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1. Create a package that exports a variable `TransformerInitializer`, `StorageTransformerInitializer`, or `ContractTransformerInitializer` that are of type [TransformerInitializer](../staging/libraries/shared/transformer/event_transformer.go#L33)
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or [StorageTransformerInitializer](../../staging/libraries/shared/transformer/storage_transformer.go#L31),
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or [ContractTransformerInitializer](../../staging/libraries/shared/transformer/contract_transformer.go#L31), respectively
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2. Design the transformers to work in the context of their [event](../staging/libraries/shared/watcher/event_watcher.go#L83),
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[storage](../../staging/libraries/shared/watcher/storage_watcher.go#L53),
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or [contract](../../staging/libraries/shared/watcher/contract_watcher.go#L68) watcher execution modes
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3. Create db migrations to run against vulcanizeDB so that we can store the transformer output
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* Do not `goose fix` the transformer migrations, this is to ensure they are always ran after the core vulcanizedb migrations which are kept in their fixed form
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* Specify migration locations for each transformer in the config with the `exporter.transformer.migrations` fields
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* If the base vDB migrations occupy this path as well, they need to be in their `goose fix`ed form
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as they are [here](../../staging/db/migrations)
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The `execute` command does not require the plugin transformer dependencies be located in their
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`$GOPATH` directories, instead it expects a prebuilt .so file (of the name specified in the config file)
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to be in `$GOPATH/src/github.com/vulcanize/vulcanizedb/plugins/` and, as noted above, also expects the plugin
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db migrations to have already been ran against the database.
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To update a plugin repository with changes to the core vulcanizedb repository, replace the vulcanizedb vendored in the plugin repo (`plugin_repo/vendor/github.com/vulcanize/vulcanizedb`)
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with the newly updated version
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* The entire vendor lib within the vendored vulcanizedb needs to be deleted (`plugin_repo/vendor/github.com/vulcanize/vulcanizedb/vendor`)
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* These complications arise due to this [conflict](https://github.com/golang/go/issues/20481) between `dep` and Go plugins
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compose:
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`./vulcanizedb compose --config=./environments/config_name.toml`
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execute:
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`./vulcanizedb execute --config=./environments/config_name.toml`
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composeAndExecute:
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## Configuration
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A .toml config file is specified when executing the command:
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`./vulcanizedb composeAndExecute --config=./environments/config_name.toml`
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The config provides information for composing a set of transformers:
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## Configuration
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A .toml config file is specified when executing the commands.
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The config provides information for composing a set of transformers from external repositories:
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```toml
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[database]
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40
documentation/transformers.md
Normal file
40
documentation/transformers.md
Normal file
@ -0,0 +1,40 @@
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# Custom transformers
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When the capabilities of the generic `contractWatcher` are not sufficient, custom transformers tailored to a specific
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purpose can be leveraged.
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Individual transformers can be composed together from any number of external repositories and executed as a single process using
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the `compose` and `execute` commands or the `composeAndExecute` command.
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## Writing custom transformers
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For help with writing different types of custom transformers for the `composeAndExecute` set of commands, please see the below:
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Storage Transformers
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* [Guide](../../staging/libraries/shared/factories/storage/README.md)
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* [Example](../../staging/libraries/shared/factories/storage/EXAMPLE.md)
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Event Transformers
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* [Guide](../../staging/libraries/shared/factories/event/README.md)
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* [Example 1](https://github.com/vulcanize/ens_transformers/tree/master/transformers/registar)
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* [Example 2](https://github.com/vulcanize/ens_transformers/tree/master/transformers/registry)
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* [Example 3](https://github.com/vulcanize/ens_transformers/tree/master/transformers/resolver)
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Contract Transformers
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* [Example 1](https://github.com/vulcanize/account_transformers)
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* [Example 2](https://github.com/vulcanize/ens_transformers/tree/master/transformers/domain_records)
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## Preparing custom transformers to work as part of a plugin
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To plug in an external transformer we need to:
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1. Create a package that exports a variable `TransformerInitializer`, `StorageTransformerInitializer`, or `ContractTransformerInitializer` that are of type [TransformerInitializer](../staging/libraries/shared/transformer/event_transformer.go#L33)
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or [StorageTransformerInitializer](../../staging/libraries/shared/transformer/storage_transformer.go#L31),
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or [ContractTransformerInitializer](../../staging/libraries/shared/transformer/contract_transformer.go#L31), respectively
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2. Design the transformers to work in the context of their [event](../staging/libraries/shared/watcher/event_watcher.go#L83),
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[storage](../../staging/libraries/shared/watcher/storage_watcher.go#L53),
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or [contract](../../staging/libraries/shared/watcher/contract_watcher.go#L68) watcher execution modes
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3. Create db migrations to run against vulcanizeDB so that we can store the transformer output
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* Do not `goose fix` the transformer migrations, this is to ensure they are always ran after the core vulcanizedb migrations which are kept in their fixed form
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* Specify migration locations for each transformer in the config with the `exporter.transformer.migrations` fields
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* If the base vDB migrations occupy this path as well, they need to be in their `goose fix`ed form
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as they are [here](../../staging/db/migrations)
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To update a plugin repository with changes to the core vulcanizedb repository, run `dep ensure` to update its dependencies.
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@ -49,6 +49,13 @@ var _ = Describe("contractWatcher light transformer", func() {
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c, ok := t.Contracts[tusdAddr]
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Expect(ok).To(Equal(true))
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// TODO: Fix this
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// This test sometimes randomly fails because
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// for some reason the starting block number is not updated from
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// its original value (5197514) to the block number (6194632)
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// of the earliest header (mocks.MockHeader1) in the repository
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// It is not clear how this happens without one of the above insertErrs
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// having been thrown and without any errors thrown during the Init() call
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Expect(c.StartingBlock).To(Equal(int64(6194632)))
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Expect(c.Abi).To(Equal(constants.TusdAbiString))
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Expect(c.Name).To(Equal("TrueUSD"))
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