tusd/pkg/handler/composer.go

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package handler
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// StoreComposer represents a composable data store. It consists of the core
// data store and optional extensions. Please consult the package's overview
// for a more detailed introduction in how to use this structure.
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type StoreComposer struct {
Core DataStore
UsesTerminater bool
Terminater TerminaterDataStore
UsesLocker bool
Locker LockerDataStore
UsesConcater bool
Concater ConcaterDataStore
UsesLengthDeferrer bool
LengthDeferrer LengthDeferrerDataStore
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}
// NewStoreComposer creates a new and empty store composer.
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func NewStoreComposer() *StoreComposer {
return &StoreComposer{}
}
// Capabilities returns a string representing the provided extensions in a
// human-readable format meant for debugging.
func (store *StoreComposer) Capabilities() string {
str := "Core: "
if store.Core != nil {
str += "✓"
} else {
str += "✗"
}
str += ` Terminater: `
if store.UsesTerminater {
str += "✓"
} else {
str += "✗"
}
str += ` Locker: `
if store.UsesLocker {
str += "✓"
} else {
str += "✗"
}
str += ` Concater: `
if store.UsesConcater {
str += "✓"
} else {
str += "✗"
}
str += ` LengthDeferrer: `
if store.UsesLengthDeferrer {
str += "✓"
} else {
str += "✗"
}
return str
}
// UseCore will set the used core data store. If the argument is nil, the
// property will be unset.
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func (store *StoreComposer) UseCore(core DataStore) {
store.Core = core
}
func (store *StoreComposer) UseTerminater(ext TerminaterDataStore) {
store.UsesTerminater = ext != nil
store.Terminater = ext
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}
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func (store *StoreComposer) UseLocker(ext LockerDataStore) {
store.UsesLocker = ext != nil
store.Locker = ext
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}
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func (store *StoreComposer) UseConcater(ext ConcaterDataStore) {
store.UsesConcater = ext != nil
store.Concater = ext
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}
func (store *StoreComposer) UseLengthDeferrer(ext LengthDeferrerDataStore) {
store.UsesLengthDeferrer = ext != nil
store.LengthDeferrer = ext
}