mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-28 01:56:30 +00:00
1e7b32490d
This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).
84 lines
2.8 KiB
Go
84 lines
2.8 KiB
Go
// Package sys includes constants and types used by both public and internal APIs.
|
|
package sys
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
)
|
|
|
|
// These two special exit codes are reserved by wazero for context Cancel and Timeout integrations.
|
|
// The assumption here is that well-behaving Wasm programs won't use these two exit codes.
|
|
const (
|
|
// ExitCodeContextCanceled corresponds to context.Canceled and returned by ExitError.ExitCode in that case.
|
|
ExitCodeContextCanceled uint32 = 0xffffffff
|
|
// ExitCodeDeadlineExceeded corresponds to context.DeadlineExceeded and returned by ExitError.ExitCode in that case.
|
|
ExitCodeDeadlineExceeded uint32 = 0xefffffff
|
|
)
|
|
|
|
// ExitError is returned to a caller of api.Function when api.Module CloseWithExitCode was invoked,
|
|
// or context.Context passed to api.Function Call was canceled or reached the Timeout.
|
|
//
|
|
// ExitCode zero value means success while any other value is an error.
|
|
//
|
|
// Here's an example of how to get the exit code:
|
|
//
|
|
// main := module.ExportedFunction("main")
|
|
// if err := main(ctx); err != nil {
|
|
// if exitErr, ok := err.(*sys.ExitError); ok {
|
|
// // This means your module exited with non-zero code!
|
|
// }
|
|
// --snip--
|
|
//
|
|
// Note: While possible the reason of this was "proc_exit" from "wasi_snapshot_preview1", it could be from other host
|
|
// functions, for example an AssemblyScript's abort handler, or any arbitrary caller of CloseWithExitCode.
|
|
//
|
|
// See https://github.com/WebAssembly/WASI/blob/main/phases/snapshot/docs.md#proc_exit and
|
|
// https://www.assemblyscript.org/concepts.html#special-imports
|
|
//
|
|
// Note: In the case of context cancellation or timeout, the api.Module from which the api.Function created is closed.
|
|
type ExitError struct {
|
|
// Note: this is a struct not a uint32 type as it was originally one and
|
|
// we don't want to break call-sites that cast into it.
|
|
exitCode uint32
|
|
}
|
|
|
|
var exitZero = &ExitError{}
|
|
|
|
func NewExitError(exitCode uint32) *ExitError {
|
|
if exitCode == 0 {
|
|
return exitZero
|
|
}
|
|
return &ExitError{exitCode: exitCode}
|
|
}
|
|
|
|
// ExitCode returns zero on success, and an arbitrary value otherwise.
|
|
func (e *ExitError) ExitCode() uint32 {
|
|
return e.exitCode
|
|
}
|
|
|
|
// Error implements the error interface.
|
|
func (e *ExitError) Error() string {
|
|
switch e.exitCode {
|
|
case ExitCodeContextCanceled:
|
|
return fmt.Sprintf("module closed with %s", context.Canceled)
|
|
case ExitCodeDeadlineExceeded:
|
|
return fmt.Sprintf("module closed with %s", context.DeadlineExceeded)
|
|
default:
|
|
return fmt.Sprintf("module closed with exit_code(%d)", e.exitCode)
|
|
}
|
|
}
|
|
|
|
// Is allows use via errors.Is
|
|
func (e *ExitError) Is(err error) bool {
|
|
if target, ok := err.(*ExitError); ok {
|
|
return e.exitCode == target.exitCode
|
|
}
|
|
if e.exitCode == ExitCodeContextCanceled && err == context.Canceled {
|
|
return true
|
|
}
|
|
if e.exitCode == ExitCodeDeadlineExceeded && err == context.DeadlineExceeded {
|
|
return true
|
|
}
|
|
return false
|
|
}
|