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Populate homeAZ cache if it is not populated when DNC calls CNS to… #3851

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Populate homeAZ cache if it is not populated when DNC calls CNS to… #3851

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21 changes: 16 additions & 5 deletions cns/restserver/homeazmonitor.go
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Original file line number Diff line number Diff line change
Expand Up @@ -50,14 +50,25 @@ func (h *HomeAzMonitor) updateCacheValue(resp cns.GetHomeAzResponse) {

// readCacheValue reads home az cache value
func (h *HomeAzMonitor) readCacheValue() cns.GetHomeAzResponse {
cachedResp, found := h.values.Get(homeAzCacheKey)
if !found {
return cns.GetHomeAzResponse{Response: cns.Response{
if cachedResp, found := h.values.Get(homeAzCacheKey); found {
return cachedResp.(cns.GetHomeAzResponse)
}

ctx, cancel := context.WithTimeout(context.Background(), ContextTimeOut)
defer cancel()
h.Populate(ctx)

if cachedResp, found := h.values.Get(homeAzCacheKey); found {
return cachedResp.(cns.GetHomeAzResponse)
}

return cns.GetHomeAzResponse{
Response: cns.Response{
ReturnCode: types.NotFound,
Message: "HomeAz Cache is unavailable",
}, HomeAzResponse: cns.HomeAzResponse{IsSupported: false}}
},
HomeAzResponse: cns.HomeAzResponse{IsSupported: false},
}
return cachedResp.(cns.GetHomeAzResponse)
}

// Start starts a new thread to refresh home az cache
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