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100 lines
3.6 KiB
Markdown
100 lines
3.6 KiB
Markdown
---
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description: The Case For Node Native Services
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---
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# Add Your Own Node Native Service
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As discussed in the [Node](../knowledge_knowledge/node/knowledge_node_services.md) section, some service functionalities useful to a large audience. Such services and can be directly deployed to a peer node as a Wasm module. The remainder of this tutorial guides you through the steps necessary to create and submit a Node Native Service candidate.
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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,
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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 in the appropriate structure as a PR to the appropriate GitHub repository. 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 details.
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Our first step is fork the ??? 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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git checkout -b MyBranchName
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```
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In your new branch create a new directory with the service name in the _builtin_ directory:
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```text
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cd builtins
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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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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 specified in config as `builtins_base_dir` **TODO: check if that applies to new repo approach.**
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Asset Requirements
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In order to deploy a builtin service, you need
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* the wasm files for each module as the module build
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* the blueprint file for the service
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* start and schedule scripts
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Just to recap, Blueprints capture module names, blueprint name, and blueprint id. -- builtins
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```text
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-- {service_alias}
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-- scheduled
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-- {script_name}_{interval_in_seconds}.air [optional]
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-- blueprint.json
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-- on_start.air [optional]
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-- on_start.json [optional]
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-- {module1_name}.wasm
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-- {module1_name}_config.json
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-- {module2_name}.wasm
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-- {module2_name}_config.json
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...
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```
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In blueprint you can specify dependencies either with name or hashes but .wasm files and config should have corresponding names. `blieprint.json` example:
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```javascript
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{
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"name": "aqua-dht",
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"dependencies": [
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"hash:558a483b1c141b66765947cf6a674abe5af2bb5b86244dfca41e5f5eb2a86e9e",
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"name:aqua-dht"
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]
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}
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```
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So modules and configs names should look like this:
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```text
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-- aqua-dht.wasm
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-- aqua-dht_config.json
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-- 558a483b1c141b66765947cf6a674abe5af2bb5b86244dfca41e5f5eb2a86e9e.wasm
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-- 558a483b1c141b66765947cf6a674abe5af2bb5b86244dfca41e5f5eb2a86e9e_config.json
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```
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`on_start.air` is optional and can contain some startup script and you can specify necessary variables in `on_start.json`. It will be executed only once after service deployment or node restart.
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`on_start.json` example:
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```javascript
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{
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"variable1" : "some_string",
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"variable2" : 5,
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}
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```
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`on_start.air` example:
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```text
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(seq
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(call relay ("some_service_alias" "some_func1") [variable1] result)
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(call relay ("some_service_alias" "some_func2") [variable2 result])
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)
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```
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