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// Command pdevbitcoinbot queries the bitstamp API and stores prices in a HDR
// Histogram. This computes the p95 price of bitcoin.
package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"log"
"net/http"
"os"
"strconv"
"within.website/x/internal"
"within.website/x/web"
"within.website/x/web/discordwebhook"
"github.com/codahale/hdrhistogram"
experrors "golang.org/x/exp/errors"
"within.website/ln"
"within.website/ln/opname"
)
type BitstampReply struct {
High string `json:"high"`
Last string `json:"last"`
Timestamp string `json:"timestamp"`
Bid string `json:"bid"`
Vwap string `json:"vwap"`
Volume string `json:"volume"`
Low string `json:"low"`
Ask string `json:"ask"`
Open float64 `json:"open"`
}
type data struct {
Snapshot *hdrhistogram.Snapshot
LastValue *string
}
var (
whURL = flag.String("webhook-url", "", "Discord webhook URL")
dataFileLocation = flag.String("data", "./data.json", "data file location")
)
func getBitstamp() (*BitstampReply, error) {
resp, err := http.Get("https://www.bitstamp.net/api/ticker/")
if err != nil {
log.Fatal(err)
}
defer resp.Body.Close()
var bsr BitstampReply
err = json.NewDecoder(resp.Body).Decode(&bsr)
if err != nil {
log.Fatal(err)
}
return &bsr, nil
}
func main() {
internal.HandleStartup()
ctx := opname.With(context.Background(), "main")
fin, err := os.Open(*dataFileLocation)
if err != nil {
var pe *os.PathError
if experrors.As(err, &pe) {
ln.Fatal(ctx, ln.F{
"err_op": pe.Op,
"err_path": pe.Path,
"err_err": pe.Err,
})
}
ln.FatalErr(ctx, err)
}
var d data
err = json.NewDecoder(fin).Decode(&d)
if err != nil {
ln.FatalErr(ctx, err)
}
fin.Close()
var h *hdrhistogram.Histogram
if d.Snapshot == nil {
h = hdrhistogram.New(-400, 3000000000, 5)
} else {
h = hdrhistogram.Import(d.Snapshot)
}
bsr, err := getBitstamp()
if err != nil {
ln.FatalErr(ctx, err)
}
bcf, err := strconv.ParseFloat(bsr.Ask, 64)
if err != nil {
ln.FatalErr(ctx, err)
}
h.RecordValue(int64(bcf))
var lv = "_shrug_"
if d.LastValue != nil {
lv = *d.LastValue
}
dw := discordwebhook.Webhook{
Content: "BITCOIN PRICE TIEM",
Username: "Buttcoin",
Embeds: []discordwebhook.Embeds{discordwebhook.Embeds{
Footer: discordwebhook.EmbedFooter{
Text: "powered by pdevbitcoinbot, made by Cadey~#1337",
},
Fields: []discordwebhook.EmbedField{
{
Name: "Now",
Value: bsr.Ask,
Inline: true,
},
{
Name: "Last",
Value: lv,
Inline: true,
},
{
Name: "P95",
Value: fmt.Sprint(h.ValueAtQuantile(95)),
Inline: true,
},
},
}},
}
req := discordwebhook.Send(*whURL, dw)
resp, err := http.DefaultClient.Do(req)
if err != nil {
ln.FatalErr(ctx, err)
}
err = discordwebhook.Validate(resp)
if err != nil {
var werr *web.Error
if experrors.As(err, &werr) {
ln.Fatal(ctx, werr)
}
ln.FatalErr(ctx, err)
}
d.LastValue = &bsr.Ask
d.Snapshot = h.Export()
fout, err := os.Create("./data.json")
if err != nil {
ln.FatalErr(ctx, err)
}
err = json.NewEncoder(fout).Encode(&d)
if err != nil {
ln.FatalErr(ctx, err)
}
}
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