113 lines
2.8 KiB
Go
113 lines
2.8 KiB
Go
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package coindesk
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import (
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"encoding/json"
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"strconv"
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"strings"
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"time"
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)
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// Asset is a cryptocurrency, like Bitcoin, Ethereum, etc.
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type Asset string
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const (
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// BTC is the Bitcoin asset.
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BTC Asset = "BTC"
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// ETH is the Ethereum asset.
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ETH Asset = "ETH"
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)
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// Response represents the general top-level format of Coindesk API responses.
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type Response[T any] struct {
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StatusCode int `json:"statusCode"`
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Message string `json:"message"`
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Data T `json:"data"`
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}
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// PriceValues contains a series of timestamped prices for a particular asset.
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type PriceValues struct {
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ISO Asset `json:"iso"`
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Name string `json:"name"`
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Slug string `json:"slug"`
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IngestionStart Date `json:"ingestionStart"`
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Entries []TimestampPrice `json:"entries"`
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}
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// AssetTickers is a map from an asset to its ticker data.
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type AssetTickers map[Asset]AssetTicker
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// AssetTicker is a snapshot of pricing data for an asset.
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type AssetTicker struct {
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ISO Asset `json:"iso"`
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Name string `json:"name"`
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Slug string `json:"slug"`
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Change struct {
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Percent float64 `json:"percent"`
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Value float64 `json:"value"`
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} `json:"change"`
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OHLC struct {
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Opening Price `json:"o"`
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High Price `json:"h"`
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Low Price `json:"l"`
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Closing Price `json:"c"`
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} `json:"ohlc"`
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CirculatingSupply float64 `json:"circulatingSupply"`
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MarketCap Price `json:"marketCap"`
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Timestamp Timestamp `json:"ts"`
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}
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// TimestampPrice represents a JSON array with two elements: an integer Unix
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// timestamp expressed in milliseconds, and a floating-point USD price.
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type TimestampPrice struct {
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Timestamp Timestamp
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Price Price
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}
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func (t *TimestampPrice) UnmarshalJSON(b []byte) error {
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a := []interface{}{&t.Timestamp, &t.Price}
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return json.Unmarshal(b, &a)
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}
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// Timestamp represents an integer Unix timestamp expressed in milliseconds
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// which has been converted into a Golang time.Time object.
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type Timestamp time.Time
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func (t *Timestamp) UnmarshalJSON(b []byte) error {
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s := string(b)
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n := len(s)
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secsStr := s[0 : n-3]
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millisStr := s[n-3:]
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secs, err := strconv.ParseInt(secsStr, 10, 64)
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if err != nil {
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return err
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}
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millis, err := strconv.ParseInt(millisStr, 10, 64)
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if err != nil {
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return err
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}
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converted := time.Unix(secs, millis*1e6)
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*t = Timestamp(converted)
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return nil
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}
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// Price represents the USD price of an asset.
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type Price float64
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// Date represents a date-only string which has been converted into a Golang
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// time.Time object.
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type Date time.Time
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func (d *Date) UnmarshalJSON(b []byte) error {
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s := string(b)
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s, _ = strings.CutPrefix(s, "\"")
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s, _ = strings.CutSuffix(s, "\"")
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t, err := time.Parse(time.DateOnly, s)
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if err != nil {
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return err
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}
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*d = Date(t)
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return nil
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}
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