83 lines
1.6 KiB
Go
83 lines
1.6 KiB
Go
package memory
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import (
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"context"
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"errors"
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"log"
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"sync"
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"go.dev.pztrn.name/metricator/internal/models"
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)
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var ErrMetricNotFound = errors.New("metric not found")
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// Storage is an in-memory storage.
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type Storage struct {
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ctx context.Context
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doneChan chan struct{}
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name string
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data map[string]models.Metric
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dataMutex sync.RWMutex
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}
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// NewStorage creates new in-memory storage to use.
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func NewStorage(ctx context.Context, name string) (*Storage, chan struct{}) {
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s := &Storage{
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ctx: ctx,
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doneChan: make(chan struct{}),
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name: name,
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}
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s.initialize()
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return s, s.doneChan
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}
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// Get returns data from storage by key.
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func (s *Storage) Get(key string) (models.Metric, error) {
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s.dataMutex.RLock()
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defer s.dataMutex.RUnlock()
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data, found := s.data[key]
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if !found {
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return models.NewMetric("", "", nil), ErrMetricNotFound
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}
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return data, nil
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}
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// GetDoneChan returns a channel which should be used to block execution
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// until storage's routines are completed.
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func (s *Storage) GetDoneChan() chan struct{} {
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return s.doneChan
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}
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// Initializes internal things.
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func (s *Storage) initialize() {
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s.data = make(map[string]models.Metric)
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}
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// Put puts passed data into storage.
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func (s *Storage) Put(data map[string]models.Metric) {
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s.dataMutex.Lock()
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defer s.dataMutex.Unlock()
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for k, v := range data {
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s.data[k] = v
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}
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log.Println("Put", len(data), "items in", s.name)
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}
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// Start starts asynchronous things if needed.
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func (s *Storage) Start() {
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// The Context Listening Goroutine.
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go func() {
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<-s.ctx.Done()
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log.Println("In-memory storage", s.name, "done")
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s.doneChan <- struct{}{}
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}()
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}
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