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# Add Your Own Builtins
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As discussed in the [Node](../knowledge_knowledge/node/knowledge_node_services.md) section, some service functionalities have ubiquitous demand making them suitable candidates to be directly deployed to a peer node. The [Aqua distributed hash table](https://github.com/fluencelabs/fluence/tree/master/deploy/builtins/aqua-dht) \(DHT\) is an example of builtin service. The remainder of this tutorial guides you through the steps necessary to create and deploy a Builtin service.
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As discussed in the [Node](../knowledge_knowledge/node/knowledge_node_services.md) section, some service functionalities have ubiquitous demand making them suitable candidates to be directly deployed to a peer node. The [Aqua distributed hash table](https://github.com/fluencelabs/fluence/tree/master/deploy/builtins/aqua-dht) \(DHT\) is an example of builtin service. The remainder of this tutorial guides you through the steps necessary to create and deploy a Builtin service.
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In order to have a service available out-of-the-box with the necessary startup and scheduling scripts, we can take advantage of the Fluence [deployer feature](https://github.com/fluencelabs/fluence/tree/master/deploy) for Node native services. This feature handles the complete deployment process including
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In order to have a service available out-of-the-box with the necessary startup and scheduling scripts, we can take advantage of the Fluence [deployer feature](https://github.com/fluencelabs/fluence/tree/master/deploy) for Node native services. This feature handles the complete deployment process including
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* module uploads,
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* service deployment and
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* script initialization and scheduling
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Note that the deployment process is a fully automated workflow requiring you to merely submit your service assets, i.e., Wasm modules and configuration scripts, in the appropriate format as a PR to the [Fluence](https://github.com/fluencelabs/fluence) repository.
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Note that the deployment process is a fully automated workflow requiring you to merely submit your service assets, i.e., Wasm modules and configuration scripts, in the appropriate format as a PR to the [Fluence](https://github.com/fluencelabs/fluence) repository.
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At this point you should have a solid grasp of creating service modules and their associated configuration files. See the [Developing Modules And Services](../development_development/) section for more details.
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Our first step is fork the [Fluence](https://github.com/fluencelabs/fluence) repo by clicking on the Fork button, upper right of the repo webpage, and follow the instructions to create a local copy. In your local repo copy, checkout a new branch with a new, unique branch name:
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Our first step is fork the [Fluence](https://github.com/fluencelabs/fluence) repo by clicking on the Fork button, upper right of the repo webpage, and follow the instructions to create a local copy. In your local repo copy, checkout a new branch with a new, unique branch name:
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```text
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cd fluence
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git checkout -b MyBranchName
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git checkout -b MyBranchName
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```
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In our new branch, we create a directory with the service name in the _deploy/builtin_ directory:
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In our new branch, we create a directory with the service name in the _deploy/builtin_ directory:
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```text
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cd deploy/builtins
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@ -27,11 +27,11 @@ mkdir my-new-super-service
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cd new-super-service
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```
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Replace _my_-_new-super-service_ with your service name.
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Replace _my_-_new-super-service_ with your service name.
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Now we can build and populate the required directory structure with your service assets. You should put your service files in the corresponding _my_-_new-super-service_ directory.
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Now we can build and populate the required directory structure with your service assets. You should put your service files in the corresponding _my_-_new-super-service_ directory.
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### Requirements
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## Requirements
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In order to deploy a builtin service, we need
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@ -39,7 +39,7 @@ In order to deploy a builtin service, we need
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* the blueprint file for the service
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* the optional start and scheduling scripts
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#### Blueprint
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### Blueprint
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Blueprints capture the service name and dependencies:
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@ -55,7 +55,7 @@ Blueprints capture the service name and dependencies:
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}
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```
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where
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where
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* name specifies the service's name and
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* dependencies list the names of the Wasm modules or the Blake3 hash of the Wasm module
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@ -73,9 +73,9 @@ b3sum my_module_3.wasm
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If you decide to use the hash approach, please use the hash for the config files names as well \(see below\).
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#### **Start Script**
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### **Start Script**
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Start scripts, which are optional, execute once after service deployment or node restarts and are submitted as _air_ files and may be accompanied by a _json_ file containing the necessary parameters.
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Start scripts, which are optional, execute once after service deployment or node restarts and are submitted as _air_ files and may be accompanied by a _json_ file containing the necessary parameters.
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```text
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;; on_start.air
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@ -95,13 +95,13 @@ and the associated data file:
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}
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```
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#### **Scheduling Script**
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### **Scheduling Script**
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Scheduling scripts allow us to decouple service execution from the client and instead can rely on a cron-like scheduler running on a node to trigger our service\(s\). For a brief overview, see [additional concepts](../development_development/development_reward_block_app/development_additional_concepts.md)
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#### Directory Structure
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### Directory Structure
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Now that we got our requirements covered, we can populate the directory structure we started to lay out at the beginning of this section. As mentioned above, service deployment as a builtin is an automated workflow one our PR is accepted. Hence, it is imperative to adhere to the directory structure below:
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Now that we got our requirements covered, we can populate the directory structure we started to lay out at the beginning of this section. As mentioned above, service deployment as a builtin is an automated workflow one our PR is accepted. Hence, it is imperative to adhere to the directory structure below:
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```text
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-- builtins
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@ -133,5 +133,5 @@ fluence
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-sqlite3_config.json # or 558a483b1c141b66765947cf6a674abe5af2bb5b86244dfca41e5f5eb2a86e9e_config.json
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```
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which is based on the [eponymous](https://github.com/fluencelabs/aqua-dht) service project.
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which is based on the [eponymous](https://github.com/fluencelabs/aqua-dht) service project.
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