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87 lines
3.9 KiB
87 lines
3.9 KiB
<h1 align="center">Fastify</h1>
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## Lifecycle
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Following the schema of the internal lifecycle of Fastify.
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On the right branch of every section there is the next phase of the lifecycle,
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on the left branch there is the corresponding error code that will be generated
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if the parent throws an error *(note that all the errors are automatically
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handled by Fastify)*.
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```
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Incoming Request
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│
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└─▶ Routing
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│
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└─▶ Instance Logger
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│
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4**/5** ◀─┴─▶ onRequest Hook
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│
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4**/5** ◀─┴─▶ preParsing Hook
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│
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4**/5** ◀─┴─▶ Parsing
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│
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4**/5** ◀─┴─▶ preValidation Hook
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│
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400 ◀─┴─▶ Validation
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│
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4**/5** ◀─┴─▶ preHandler Hook
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│
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4**/5** ◀─┴─▶ User Handler
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│
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└─▶ Reply
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│
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4**/5** ◀─┴─▶ preSerialization Hook
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│
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└─▶ onSend Hook
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│
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4**/5** ◀─┴─▶ Outgoing Response
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│
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└─▶ onResponse Hook
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```
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At any point before or during the `User Handler`, `reply.hijack()` can be called
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to prevent Fastify from:
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- Running all the following hooks and user handler
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- Sending the response automatically
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NB (*): If `reply.raw` is used to send a response back to the user, `onResponse`
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hooks will still be executed
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## Reply Lifecycle
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Whenever the user handles the request, the result may be:
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- in async handler: it returns a payload
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- in async handler: it throws an `Error`
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- in sync handler: it sends a payload
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- in sync handler: it sends an `Error` instance
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If the reply was hijacked, we skip all the below steps. Otherwise, when it is
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being submitted, the data flow performed is the following:
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```
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★ schema validation Error
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│
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└─▶ schemaErrorFormatter
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│
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reply sent ◀── JSON ─┴─ Error instance
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│
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│ ★ throw an Error
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★ send or return │ │
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│ │ │
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│ ▼ │
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reply sent ◀── JSON ─┴─ Error instance ──▶ setErrorHandler ◀─────┘
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│
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reply sent ◀── JSON ─┴─ Error instance ──▶ onError Hook
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│
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└─▶ reply sent
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```
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Note: `reply sent` means that the JSON payload will be serialized by:
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- the [reply serialized](./Server.md#setreplyserializer) if set
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- or by the [serializer compiler](./Server.md#setserializercompiler) when a JSON
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schema has been set for the returning HTTP status code
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- or by the default `JSON.stringify` function
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