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getpairs.go
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/
getpairs.go
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package rest
import (
"errors"
"fmt"
"net/http"
"strconv"
"github.com/cosmos/cosmos-sdk/client/context"
"github.com/bnb-chain/node/plugins/dex/types"
"github.com/bnb-chain/node/wire"
)
const maxPairsLimit = 1000
const defaultPairsLimit = 100
const defaultPairsOffset = 0
func listAllTradingPairs(ctx context.CLIContext, cdc *wire.Codec, prefix string, offset int, limit int) ([]types.TradingPair, error) {
bz, err := ctx.Query(fmt.Sprintf("%s/pairs/%d/%d", prefix, offset, limit), nil)
if err != nil {
return nil, err
}
pairs := make([]types.TradingPair, 0)
err = cdc.UnmarshalBinaryLengthPrefixed(bz, &pairs)
return pairs, err
}
// GetPairsReqHandler creates an http request handler to list
func GetPairsReqHandler(cdc *wire.Codec, ctx context.CLIContext, abciQueryPrefix string) http.HandlerFunc {
type params struct {
limit int
offset int
}
responseType := "application/json"
throw := func(w http.ResponseWriter, status int, err error) {
w.Header().Set("Content-Type", "text/plain")
w.WriteHeader(status)
_, _ = w.Write([]byte(err.Error()))
}
return func(w http.ResponseWriter, r *http.Request) {
limitStr := r.FormValue("limit")
offsetStr := r.FormValue("offset")
// validate and use limit param
limit := defaultPairsLimit
if limitStr != "" && len(limitStr) < 100 {
parsed, err := strconv.Atoi(limitStr)
if err != nil {
throw(w, http.StatusExpectationFailed, errors.New("invalid limit"))
return
}
limit = parsed
}
// validate and use offset param
offset := defaultPairsOffset
if offsetStr != "" && len(offsetStr) < 100 {
parsed, err := strconv.Atoi(offsetStr)
if err != nil {
throw(w, http.StatusExpectationFailed, errors.New("invalid offset"))
return
}
offset = parsed
}
// collect params
params := params{
limit: limit,
offset: offset,
}
// apply max pairs limit
if params.limit > maxPairsLimit {
params.limit = maxPairsLimit
}
pairs, err := listAllTradingPairs(ctx, cdc, abciQueryPrefix, params.offset, params.limit)
if err != nil {
throw(w, http.StatusInternalServerError, err)
return
}
if pairs == nil {
// assume this was an offset parse issue
pairs = make([]types.TradingPair, 0)
}
output, err := cdc.MarshalJSON(pairs)
if err != nil {
throw(w, http.StatusInternalServerError, err)
return
}
w.Header().Set("Content-Type", responseType)
w.WriteHeader(http.StatusOK)
_, _ = w.Write(output)
}
}