106 lines
2.9 KiB
Go
106 lines
2.9 KiB
Go
package paginator
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import (
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"fmt"
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"strings"
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)
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// Tokenizer is the interface that must be implemented to provide pagination
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// tokens to the Paginator.
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type Tokenizer interface {
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// GetToken returns the pagination token for the given element.
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GetToken(interface{}) string
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}
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// IDGetter is the interface that must be implemented by structs that need to
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// have their ID as part of the pagination token.
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type IDGetter interface {
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GetID() string
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}
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// NamespaceGetter is the interface that must be implemented by structs that
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// need to have their Namespace as part of the pagination token.
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type NamespaceGetter interface {
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GetNamespace() string
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}
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// CreateIndexGetter is the interface that must be implemented by structs that
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// need to have their CreateIndex as part of the pagination token.
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type CreateIndexGetter interface {
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GetCreateIndex() uint64
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}
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// StructsTokenizerOptions is the configuration provided to a StructsTokenizer.
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//
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// These are some of the common use cases:
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// - Structs that can be uniquely identified with only its own ID:
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//
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// StructsTokenizerOptions {
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// WithID: true,
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// }
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//
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// - Structs that are only unique within their namespace:
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//
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// StructsTokenizerOptions {
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// WithID: true,
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// WithNamespace: true,
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// }
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//
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// - Structs that can be sorted by their create index should also set
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// `WithCreateIndex` to `true` along with the other options:
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//
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// StructsTokenizerOptions {
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// WithID: true,
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// WithNamespace: true,
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// WithCreateIndex: true,
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// }
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type StructsTokenizerOptions struct {
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WithCreateIndex bool
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WithNamespace bool
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WithID bool
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}
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// StructsTokenizer is an pagination token generator that can create different
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// formats of pagination tokens based on common fields found in the structs
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// package.
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type StructsTokenizer struct {
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opts StructsTokenizerOptions
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}
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// NewStructsTokenizer returns a new StructsTokenizer.
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func NewStructsTokenizer(_ Iterator, opts StructsTokenizerOptions) StructsTokenizer {
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return StructsTokenizer{
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opts: opts,
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}
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}
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func (it StructsTokenizer) GetToken(raw interface{}) string {
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if raw == nil {
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return ""
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}
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parts := []string{}
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if it.opts.WithCreateIndex {
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token := raw.(CreateIndexGetter).GetCreateIndex()
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parts = append(parts, fmt.Sprintf("%v", token))
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}
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if it.opts.WithNamespace {
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token := raw.(NamespaceGetter).GetNamespace()
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parts = append(parts, token)
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}
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if it.opts.WithID {
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token := raw.(IDGetter).GetID()
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parts = append(parts, token)
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}
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// Use a character that is not part of validNamespaceName as separator to
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// avoid accidentally generating collisions.
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// For example, namespace `a` and job `b-c` would collide with namespace
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// `a-b` and job `c` into the same token `a-b-c`, since `-` is an allowed
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// character in namespace.
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return strings.Join(parts, ".")
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}
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