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coingecko.go
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coingecko.go
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package coingecko
import (
"errors"
"time"
"log"
"fmt"
"strconv"
"encoding/json"
)
type Coin struct {
ID CoinID `json:"id"`
Symbol string `json:"symbol"`
Name string `json:"name"`
}
type CoinID string
type CoinData struct {
ID CoinID `json:"id"`
Symbol string `json:"symbol"`
Name string `json:"name"`
BlockTimeInMinutes int `json:"block_time_in_minutes"`
Links struct {
Homepage []string `json:"homepage"`
} `json:"links"`
Image struct {
Thumb string `json:"thumb"`
Small string `json:"small"`
Large string `json:"large"`
} `json:"image"`
MarketData struct {
CurrentPrice map[string]float64 `json:"current_price"`
} `json:"market_data"`
}
type CoinGraph struct {
Prices [][2]float64
MarketCaps [][2]float64
TotalVolumes [][2]float64
}
var Coingecko RPC = RPC {
URL: "https://api.coingecko.com",
}
func GetCoinList() (coins []Coin, err error) {
if !GetFromCache("COINLIST", 3600, &coins) {
err = Coingecko.SimQuery("/api/v3/coins/list", "GET", &coins)
if err != nil { return }
SaveToCache("COINLIST", coins)
}
return
}
func GetCoinData(id CoinID) (data CoinData, err error) {
cache := "COINPRICE." + string(id)
url := "/api/v3/coins/" + string(id) + "?localization=false"
if !GetFromCache(cache, 20, &data) {
err = Coingecko.SimQuery(url, "GET", &data)
SaveToCache(cache, data)
}
return
}
func GetCoinID(ticker string) (id CoinID, err error) {
var coins []Coin
var coin Coin
coins, err = GetCoinList()
if err != nil { return }
for _, coin = range coins {
if string(coin.ID) == ticker { return coin.ID, nil }
}
for _, coin = range coins {
if coin.Symbol == ticker { return coin.ID, nil }
}
return "", errors.New("Coin " + ticker + " not found")
}
func GetCoinPrice(ticker, currency string) (price float64, err error) {
var id CoinID
var data CoinData
id, err = GetCoinID(ticker)
if err != nil { return }
data, err = GetCoinData(id)
if err != nil { return }
price, err = data.Price(currency)
if err != nil { return }
return
}
func GetCoinGraph(id CoinID, start, end time.Time, currency string) (graph CoinGraph, err error) {
var url string
url += "/api/v3/coins/" + string(id) + "/market_chart/range"
url += "?" + "vs_currency=" + currency
url += "&" + "from=" + strconv.FormatInt(start.Unix(), 10)
url += "&" + "to=" + strconv.FormatInt(end.Unix() , 10)
err = Coingecko.SimQuery(url, "GET", &graph)
return
}
func GetCoinHistory(id CoinID, day time.Time) (data CoinData, err error) {
var url string
url += "/api/v3/coins/" + string(id) + "/history"
url += "?" + "date=" + day.Format("02-01-2006")
url += "&" + "localization=false"
err = Coingecko.SimQuery(url, "GET", &data)
return
}
func (g *CoinGraph) PrintPrices() {
var row [2]float64
for _, row = range g.Prices {
fmt.Printf("%-15.0f %-15.10f\n", row[0]/1000, row[1])
}
}
func (d *CoinData) Print() {
b, err := json.Marshal(d)
if err != nil {
log.Panic(err)
}
fmt.Print(string(b))
}
func (d *CoinData) Price(currency string) (price float64, err error) {
var found bool
price, found = d.MarketData.CurrentPrice[currency]
if !found {
err = errors.New("Currency not supported")
return
}
return
}