75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
package mapstate
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import (
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"sync"
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"github.com/ipfs/ipfs-cluster/api"
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cid "github.com/ipfs/go-cid"
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)
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// Version is the map state Version. States with old versions should
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// perform an upgrade before.
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const Version = 1
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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]api.CidArgSerial
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Version int
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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]api.CidArgSerial),
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}
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}
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// Add adds a CidArg to the internal map.
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func (st *MapState) Add(c api.CidArg) error {
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st.pinMux.Lock()
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defer st.pinMux.Unlock()
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st.PinMap[c.Cid.String()] = c.ToSerial()
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return nil
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}
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// Rm removes a Cid from the internal map.
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func (st *MapState) Rm(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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// Get returns CidArg information for a CID.
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func (st *MapState) Get(c *cid.Cid) api.CidArg {
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st.pinMux.RLock()
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defer st.pinMux.RUnlock()
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cargs, ok := st.PinMap[c.String()]
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if !ok { // make sure no panics
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return api.CidArg{}
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}
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return cargs.ToCidArg()
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}
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// Has returns true if the Cid belongs to the State.
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func (st *MapState) Has(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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// List provides the list of tracked CidArgs.
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func (st *MapState) List() []api.CidArg {
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st.pinMux.RLock()
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defer st.pinMux.RUnlock()
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cids := make([]api.CidArg, 0, len(st.PinMap))
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for _, v := range st.PinMap {
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cids = append(cids, v.ToCidArg())
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}
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return cids
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}
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