@fastify/fast-json-stringify-compiler
v5.0.1
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Build and manage the fast-json-stringify instances for the fastify framework
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@fastify/fast-json-stringify-compiler
Build and manage the fast-json-stringify
instances for the fastify framework.
This package is responsible for compiling the application's response
JSON schemas into optimized functions to speed up the response time.
Versions
| @fastify/fast-json-stringify-compiler
| fast-json-stringify
| Supported fastify
|
|----------------------------------------:|----------------------:|--------------------:|
| v1.x | v3.x | ^3.x |
| v2.x | v3.x | ^4.x |
| v3.x | v4.x | ^4.x |
| v4.x | v5.x | ^4.x |
fast-json-stringify Configuration
The fast-json-stringify
configuration is the default one. You can check it the default settings in the fast-json-stringify
option documentation.
You can also override the default configuration by passing the serializerOpts
configuration to the Fastify instance.
Usage
This module is already used as default by Fastify. If you need to provide to your server instance a different version, refer to the official doc.
fast-json-stringify Standalone
[email protected]
introduces the standalone feature that let you to pre-compile your schemas and use them in your application for a faster startup.
To use this feature, you must be aware of the following:
- You must generate and save the application's compiled schemas.
- Read the compiled schemas from the file and provide them back to your Fastify application.
Generate and save the compiled schemas
Fastify helps you to generate the serialization schemas functions and it is your choice to save them where you want.
To accomplish this, you must use a new compiler: @fastify/fast-json-stringify-compiler/standalone
.
You must provide 2 parameters to this compiler:
readMode: false
: a boolean to indicate that you want generate the schemas functions string.storeFunction
" a sync function that must store the source code of the schemas functions. You may provide an async function too, but you must manage errors.
When readMode: false
, the compiler is meant to be used in development ONLY.
const { StandaloneSerializer } = require('@fastify/fast-json-stringify-compiler')
const factory = StandaloneSerializer({
readMode: false,
storeFunction (routeOpts, schemaSerializationCode) {
// routeOpts is like: { schema, method, url, httpStatus }
// schemaSerializationCode is a string source code that is the compiled schema function
const fileName = generateFileName(routeOpts)
fs.writeFileSync(path.join(__dirname, fileName), schemaSerializationCode)
}
})
const app = fastify({
jsonShorthand: false,
schemaController: {
compilersFactory: {
buildSerializer: factory
}
}
})
// ... add all your routes with schemas ...
app.ready().then(() => {
// at this stage all your schemas are compiled and stored in the file system
// now it is important to turn off the readMode
})
Read the compiled schemas functions
At this stage, you should have a file for every route's schema.
To use them, you must use the @fastify/fast-json-stringify-compiler/standalone
with the parameters:
readMode: true
: a boolean to indicate that you want read and use the schemas functions string.restoreFunction
" a sync function that must return a function to serialize the route's payload.
Important keep away before you continue reading the documentation:
- when you use the
readMode: true
, the application schemas are not compiled (they are ignored). So, if you change your schemas, you must recompile them! - as you can see, you must relate the route's schema to the file name using the
routeOpts
object. You may use therouteOpts.schema.$id
field to do so, it is up to you to define a unique schema identifier.
const { StandaloneSerializer } = require('@fastify/fast-json-stringify-compiler')
const factory = StandaloneSerializer({
readMode: true,
restoreFunction (routeOpts) {
// routeOpts is like: { schema, method, url, httpStatus }
const fileName = generateFileName(routeOpts)
return require(path.join(__dirname, fileName))
}
})
const app = fastify({
jsonShorthand: false,
schemaController: {
compilersFactory: {
buildSerializer: factory
}
}
})
// ... add all your routes with schemas as before...
app.listen({ port: 3000 })
How it works
This module provide a factory function to produce Serializer Compilers functions.
License
Licensed under MIT.