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ledger_request.go
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ledger_request.go
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package horizonclient
import (
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
hProtocol "github.com/stellar/go/protocols/horizon"
"github.com/stellar/go/support/errors"
)
// BuildURL creates the endpoint to be queried based on the data in the LedgerRequest struct.
// If no data is set, it defaults to the build the URL for all ledgers
func (lr LedgerRequest) BuildURL() (endpoint string, err error) {
endpoint = "ledgers"
if lr.forSequence != 0 {
endpoint = fmt.Sprintf(
"%s/%d",
endpoint,
lr.forSequence,
)
} else {
queryParams := addQueryParams(cursor(lr.Cursor), limit(lr.Limit), lr.Order)
if queryParams != "" {
endpoint = fmt.Sprintf(
"%s?%s",
endpoint,
queryParams,
)
}
}
_, err = url.Parse(endpoint)
if err != nil {
err = errors.Wrap(err, "failed to parse endpoint")
}
return endpoint, err
}
// HTTPRequest returns the http request for the ledger endpoint
func (lr LedgerRequest) HTTPRequest(horizonURL string) (*http.Request, error) {
endpoint, err := lr.BuildURL()
if err != nil {
return nil, err
}
return http.NewRequest("GET", horizonURL+endpoint, nil)
}
// LedgerHandler is a function that is called when a new ledger is received
type LedgerHandler func(hProtocol.Ledger)
// StreamLedgers streams stellar ledgers. It can be used to stream all ledgers. Use context.WithCancel
// to stop streaming or context.Background() if you want to stream indefinitely.
// LedgerHandler is a user-supplied function that is executed for each streamed ledger received.
func (lr LedgerRequest) StreamLedgers(ctx context.Context, client *Client,
handler LedgerHandler) (err error) {
endpoint, err := lr.BuildURL()
if err != nil {
return errors.Wrap(err, "unable to build endpoint for ledger request")
}
url := fmt.Sprintf("%s%s", client.fixHorizonURL(), endpoint)
return client.stream(ctx, url, func(data []byte) error {
var ledger hProtocol.Ledger
err = json.Unmarshal(data, &ledger)
if err != nil {
return errors.Wrap(err, "error unmarshaling data for ledger request")
}
handler(ledger)
return nil
})
}