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73 lines
1.4 KiB
Go
73 lines
1.4 KiB
Go
package stream
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import (
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"fmt"
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"io"
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"sync"
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)
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type stream struct {
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sync.Mutex
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writers map[string]*writer
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}
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// New returns a new in-memory implementation of Stream.
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func New() Stream {
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return &stream{
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writers: map[string]*writer{},
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}
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}
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// Reader returns an io.Reader for reading from to the stream.
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func (s *stream) Reader(name string) (io.ReadCloser, error) {
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s.Lock()
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defer s.Unlock()
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if !s.exists(name) {
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return nil, fmt.Errorf("stream: cannot read stream %s, not found", name)
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}
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return s.writers[name].Reader()
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}
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// Writer returns an io.WriteCloser for writing to the stream.
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func (s *stream) Writer(name string) (io.WriteCloser, error) {
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s.Lock()
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defer s.Unlock()
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if !s.exists(name) {
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return nil, fmt.Errorf("stream: cannot write stream %s, not found", name)
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}
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return s.writers[name], nil
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}
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// Create creates a new stream.
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func (s *stream) Create(name string) error {
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s.Lock()
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defer s.Unlock()
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if s.exists(name) {
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return fmt.Errorf("stream: cannot create stream %s, already exists", name)
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}
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s.writers[name] = newWriter()
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return nil
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}
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// Delete deletes the stream by key.
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func (s *stream) Delete(name string) error {
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s.Lock()
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defer s.Unlock()
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if !s.exists(name) {
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return fmt.Errorf("stream: cannot delete stream %s, not found", name)
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}
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w := s.writers[name]
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delete(s.writers, name)
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return w.Close()
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}
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func (s *stream) exists(name string) bool {
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_, exists := s.writers[name]
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return exists
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}
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