> For the complete documentation index, see [llms.txt](https://dzhelezov.gitbook.io/hydra/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dzhelezov.gitbook.io/hydra/docs/manifest-spec.md).

# Query Node Manifest

## Overview

| Field                   | Type             | Description                                                                          |
| ----------------------- | ---------------- | ------------------------------------------------------------------------------------ |
| **version**             | *String*         | A Semver version indicating which version of this API is being used.                 |
| **description**         | *String*         | An optional description of the substrate chain.                                      |
| **hydraVersion**        | String           | SemVer range of Hydra Processor used by the mappings.                                |
| **indexerVersionRange** | String           | Semver version range of supported Hydra Indexers. If not set, same as `hydraVersion` |
| **repository**          | *String*         | An optional link to where the subgraph lives.                                        |
| **dataSources**         | Data Source Spec | Each data source spec defines the data that will be ingested                         |
| **entities**            | *String*         | Glob path to schema model files (with typeorm metadata)                              |
| **typegen**             | TypeGen Spec     | Specification for Typegen tool                                                       |

## Data Source

| Field    | Type     | Description                                            |
| -------- | -------- | ------------------------------------------------------ |
| **kind** | *String* | The type of data source. Possible values: *substrate*. |
| **node** | *String* | Chain name                                             |

### Typegen

| Field                       | Type     | Description                                                              |
| --------------------------- | -------- | ------------------------------------------------------------------------ |
| **metadata**                | *String* | The type of data source. Possible values: *substrate*.                   |
| **metadata.source**         | *String* | Chain name                                                               |
| **metadata.blockHash**      | String   | block hash to from where the metadata is fetched                         |
| **events**                  | List     | A list of event names for which the typescript classes will be generated |
| **calls**                   | List     | A list of extrinsics to be generated                                     |
| **outDir**                  | String   | The root directory of the generated classes                              |
| **customTypes.typedefsLoc** | String   | Location of the type definitions json                                    |

### Mapping

The `mapping` field may be one of the following supported mapping manifests:

| Field                 | Type                 | Description                                                                                                        |
| --------------------- | -------------------- | ------------------------------------------------------------------------------------------------------------------ |
| **mappingsModule**    | *String*             | A JS module to be loaded by the processor (should have all the handler functions exported)                         |
| **imports**           | *List*               | A list of modules that should be additionally loaded by the processor (e.g. generated event and extrinsic classes) |
| **range**             | *String*             | A string representation of the block height range for the run (see Range rep for details)                          |
| **eventHandlers**     | List of Handler Spec | Specification of event handlers                                                                                    |
| **extrinsicHandlers** | List of Handler Spec | Specification of extrinsic handlers                                                                                |
| **preBlockHooks**     | List of Handler Spec | Specification of hooks run before all the events in the block                                                      |
| **postBlockHooks**    | List of Handler Spec | Specification of hooks run after all the events in the block                                                       |

#### Handler

| Field                  | Type          | Description                                                                                                                      |
| ---------------------- | ------------- | -------------------------------------------------------------------------------------------------------------------------------- |
| **handler**            | String        | Handler name                                                                                                                     |
| **event**              | *String*      | (For eventHandlers only) An identifier for an event that will be handled in the mapping script.                                  |
| **extrinsic**          | *String*      | (For extrinsicHandlers only) An identifier for an extrinsic that will be handled in the mapping script.                          |
| **triggerEvents**      | String        | (For extrinsicHandlers only) A list of event identifier that triggers the extrinsic handlers. Default: `system.ExtrinsicSuccess` |
| **filter**             | *Filter Spec* | Additional filter specifying the condition for the handler to be triggered                                                       |
| **filter.height**      | *String*      | String representation of the block height range                                                                                  |
| **filter.specVersion** | *String*      | Range of `RuntimeVersion.specVersion`. Useful when dealing with runtime upgrades                                                 |

**Range**

`Range` is an open, semi-open, or closed interval. An interval can either be finite or infinite. It is represented by a string as below

From X to Y, inclusive: `[X, Y]`

From X to Y, exclusive: `(X, Y)`

From X (excl) to Y, incl: `(X, Y]`

From X (excl) to infinity: `(X, )`