59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
package mapstate
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import (
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"sync"
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cid "github.com/ipfs/go-cid"
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)
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// MapState is a very simple database to store the state of the system
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// using a Go map. It is thread safe. It implements the State interface.
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type MapState struct {
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pinMux sync.RWMutex
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PinMap map[string]struct{}
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}
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// NewMapState initializes the internal map and returns a new MapState object.
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func NewMapState() *MapState {
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return &MapState{
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PinMap: make(map[string]struct{}),
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}
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}
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// AddPin adds a Cid to the internal map.
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func (st *MapState) AddPin(c *cid.Cid) error {
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st.pinMux.Lock()
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defer st.pinMux.Unlock()
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var a struct{}
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st.PinMap[c.String()] = a
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return nil
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}
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// RmPin removes a Cid from the internal map.
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func (st *MapState) RmPin(c *cid.Cid) error {
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st.pinMux.Lock()
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defer st.pinMux.Unlock()
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delete(st.PinMap, c.String())
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return nil
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}
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// HasPin returns true if the Cid belongs to the State.
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func (st *MapState) HasPin(c *cid.Cid) bool {
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st.pinMux.RLock()
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defer st.pinMux.RUnlock()
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_, ok := st.PinMap[c.String()]
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return ok
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}
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// ListPins provides a list of Cids in the State.
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func (st *MapState) ListPins() []*cid.Cid {
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st.pinMux.RLock()
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defer st.pinMux.RUnlock()
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cids := make([]*cid.Cid, 0, len(st.PinMap))
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for k := range st.PinMap {
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c, _ := cid.Decode(k)
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cids = append(cids, c)
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}
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return cids
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}
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