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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package bll | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "net/http" | ||
| "sync/atomic" | ||
| "time" | ||
|
|
||
| "github.com/teambition/gear" | ||
| "github.com/yiwen-ai/wallet-api/src/service" | ||
| "github.com/yiwen-ai/wallet-api/src/util" | ||
| ) | ||
|
|
||
| var userAgent string = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36" | ||
|
|
||
| type ExternalAPI struct { | ||
| redis *service.Redis | ||
| rates atomic.Pointer[ExchangeRatesOutput] | ||
| } | ||
|
|
||
| type ExchangeRatesOutput struct { | ||
| LastUpdate uint `json:"last_update" cbor:"last_update"` // unix timestamp in seconds | ||
| NextUpdate uint `json:"next_update" cbor:"next_update"` | ||
| Base string `json:"base" cbor:"base"` // base should be "HKD" | ||
| Rates map[string]float32 `json:"rates" cbor:"rates"` | ||
| } | ||
|
|
||
| func (b *ExternalAPI) ExchangeRate(ctx context.Context) (*ExchangeRatesOutput, error) { | ||
| v := b.rates.Load() | ||
| if v == nil { | ||
| v := &ExchangeRatesOutput{} | ||
| _ = b.redis.GetCBOR(ctx, "exchange_rates", &v) | ||
| } | ||
|
|
||
| r := util.Int63n(7200) | ||
| if v != nil && time.Now().Unix()-r < int64(v.LastUpdate) { | ||
| return v, nil | ||
| } | ||
|
|
||
| if v != nil && v.LastUpdate > 0 { | ||
| // we should update later | ||
| go b.exchangeRate(ctx) | ||
| return v, nil | ||
| } | ||
|
|
||
| // we should update now: | ||
| return b.exchangeRate(ctx) | ||
| } | ||
|
|
||
| func (b *ExternalAPI) exchangeRate(ctx context.Context) (*ExchangeRatesOutput, error) { | ||
|
|
||
| // https://www.exchangerate-api.com/docs | ||
| ctxHeader := make(util.ContextHTTPHeader) | ||
| http.Header(ctxHeader).Set("User-Agent", userAgent) | ||
| ctx = gear.CtxWith[util.ContextHTTPHeader](ctx, &ctxHeader) | ||
|
|
||
| type exchangeRateOutput struct { | ||
| Result string `json:"result"` | ||
| LastUpdate uint `json:"time_last_update_unix"` | ||
| NextUpdate uint `json:"time_next_update_unix"` | ||
| // should be "HKD" | ||
| Base string `json:"base_code"` | ||
| Rates map[string]float32 `json:"conversion_rates"` | ||
| } | ||
|
|
||
| output := &exchangeRateOutput{} | ||
| api := "https://v6.exchangerate-api.com/v6/245ef0a5e7b4a1799b2d9a64/latest/HKD" | ||
| err := util.RequestJSON(ctx, util.ExternalHTTPClient, http.MethodGet, api, nil, output) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| if output.Result != "success" { | ||
| return nil, errors.New("fetch exchange rate failed") | ||
| } | ||
|
|
||
| rate := &ExchangeRatesOutput{ | ||
| LastUpdate: output.LastUpdate, | ||
| NextUpdate: output.NextUpdate, | ||
| Base: output.Base, | ||
| Rates: output.Rates, | ||
| } | ||
|
|
||
| b.rates.Store(rate) | ||
| if err = b.redis.SetCBOR(ctx, "exchange_rates", rate, 0); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return rate, nil | ||
| } |
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