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api_server.go
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api_server.go
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package backend
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"path/filepath"
"time"
"github.com/stellar/go/clients/horizonclient"
"github.com/stellar/kelp/support/kelpos"
)
// APIServer is an instance of the API service
type APIServer struct {
kelpBinPath *kelpos.OSPath
botConfigsPath *kelpos.OSPath
botLogsPath *kelpos.OSPath
kos *kelpos.KelpOS
horizonTestnetURI string
horizonPubnetURI string
ccxtRestUrl string
apiTestNet *horizonclient.Client
apiPubNet *horizonclient.Client
noHeaders bool
quitFn func()
cachedOptionsMetadata metadata
}
// MakeAPIServer is a factory method
func MakeAPIServer(
kos *kelpos.KelpOS,
botConfigsPath *kelpos.OSPath,
botLogsPath *kelpos.OSPath,
horizonTestnetURI string,
apiTestNet *horizonclient.Client,
horizonPubnetURI string,
apiPubNet *horizonclient.Client,
ccxtRestUrl string,
noHeaders bool,
quitFn func(),
) (*APIServer, error) {
kelpBinPath := kos.GetBinDir().Join(filepath.Base(os.Args[0]))
optionsMetadata, e := loadOptionsMetadata()
if e != nil {
return nil, fmt.Errorf("error while loading options metadata when making APIServer: %s", e)
}
return &APIServer{
kelpBinPath: kelpBinPath,
botConfigsPath: botConfigsPath,
botLogsPath: botLogsPath,
kos: kos,
horizonTestnetURI: horizonTestnetURI,
horizonPubnetURI: horizonPubnetURI,
ccxtRestUrl: ccxtRestUrl,
apiTestNet: apiTestNet,
apiPubNet: apiPubNet,
noHeaders: noHeaders,
cachedOptionsMetadata: optionsMetadata,
quitFn: quitFn,
}, nil
}
func (s *APIServer) parseBotName(r *http.Request) (string, error) {
botNameBytes, e := ioutil.ReadAll(r.Body)
if e != nil {
return "", fmt.Errorf("error when reading request input: %s\n", e)
}
return string(botNameBytes), nil
}
func (s *APIServer) writeError(w http.ResponseWriter, message string) {
log.Print(message)
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(message))
}
// ErrorResponse represents an error (deprecated)
type ErrorResponse struct {
Error string `json:"error"`
}
// KelpError represents an error
type KelpError struct {
ObjectType errorType `json:"object_type"`
ObjectName string `json:"object_name"`
Date time.Time `json:"date"`
Level errorLevel `json:"level"`
Message string `json:"message"`
}
// String is the Stringer method
func (ke *KelpError) String() string {
return fmt.Sprintf("KelpError[objectType=%s, objectName=%s, date=%s, level=%s, message=%s]", ke.ObjectType, ke.ObjectName, ke.Date.Format("20060102T150405MST"), ke.Level, ke.Message)
}
// KelpErrorResponseWrapper is the outer object that contains the Kelp Error
type KelpErrorResponseWrapper struct {
KelpError KelpError `json:"kelp_error"`
}
func makeKelpErrorResponseWrapper(
objectType errorType,
objectName string,
date time.Time,
level errorLevel,
message string,
) KelpErrorResponseWrapper {
return KelpErrorResponseWrapper{
KelpError: KelpError{
ObjectType: objectType,
ObjectName: objectName,
Date: date,
Level: level,
Message: message,
},
}
}
// String is the Stringer method
func (kerw *KelpErrorResponseWrapper) String() string {
return fmt.Sprintf("KelpErrorResponseWrapper[kelp_error=%s]", kerw.KelpError)
}
func (s *APIServer) writeErrorJson(w http.ResponseWriter, message string) {
log.Println(message)
w.WriteHeader(http.StatusInternalServerError)
marshalledJson, e := json.MarshalIndent(ErrorResponse{Error: message}, "", " ")
if e != nil {
log.Printf("unable to marshal json with indentation: %s\n", e)
w.Write([]byte(fmt.Sprintf("unable to marshal json with indentation: %s\n", e)))
return
}
w.Write(marshalledJson)
}
func (s *APIServer) writeKelpError(w http.ResponseWriter, kerw KelpErrorResponseWrapper) {
w.WriteHeader(http.StatusInternalServerError)
log.Printf("writing error: %s\n", kerw)
marshalledJSON, e := json.MarshalIndent(kerw, "", " ")
if e != nil {
log.Printf("unable to marshal json with indentation: %s\n", e)
w.Write([]byte(fmt.Sprintf("unable to marshal json with indentation: %s\n", e)))
return
}
w.Write(marshalledJSON)
}
func (s *APIServer) writeJson(w http.ResponseWriter, v interface{}) {
s.writeJsonWithLog(w, v, true)
}
func (s *APIServer) writeJsonWithLog(w http.ResponseWriter, v interface{}, doLog bool) {
marshalledJson, e := json.MarshalIndent(v, "", " ")
if e != nil {
s.writeErrorJson(w, fmt.Sprintf("unable to marshal json with indentation: %s", e))
return
}
if doLog {
log.Printf("responseJson: %s\n", string(marshalledJson))
}
w.WriteHeader(http.StatusOK)
w.Write(marshalledJson)
}
func (s *APIServer) runKelpCommandBlocking(namespace string, cmd string) ([]byte, error) {
// There is a weird issue on windows where the absolute path for the kelp binary does not work on the release GUI
// version because of the unzipped directory name but it will work on the released cli version or if we change the
// name of the folder in which the GUI version is unzipped.
// To avoid these issues we only invoke with the binary name as opposed to the absolute path that contains the
// directory name. see start_bot.go for some experimentation with absolute and relative paths
cmdString := fmt.Sprintf("%s %s", s.kelpBinPath.Unix(), cmd)
return s.kos.Blocking(namespace, cmdString)
}
func (s *APIServer) runKelpCommandBackground(namespace string, cmd string) (*kelpos.Process, error) {
// There is a weird issue on windows where the absolute path for the kelp binary does not work on the release GUI
// version because of the unzipped directory name but it will work on the released cli version or if we change the
// name of the folder in which the GUI version is unzipped.
// To avoid these issues we only invoke with the binary name as opposed to the absolute path that contains the
// directory name. see start_bot.go for some experimentation with absolute and relative paths
cmdString := fmt.Sprintf("%s %s", s.kelpBinPath.Unix(), cmd)
return s.kos.Background(namespace, cmdString)
}
func (s *APIServer) setupOpsDirectory() error {
e := s.kos.Mkdir(s.botConfigsPath)
if e != nil {
return fmt.Errorf("error setting up configs directory (%s): %s\n", s.botConfigsPath, e)
}
e = s.kos.Mkdir(s.botLogsPath)
if e != nil {
return fmt.Errorf("error setting up logs directory (%s): %s\n", s.botLogsPath, e)
}
return nil
}