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orion.go
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orion.go
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package orion
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"strconv"
"strings"
)
type Attribute struct {
Type string
Value string
}
type Attributes struct {
values map[string]Attribute
}
func NewAttributes() Attributes {
return Attributes{
values: make(map[string]Attribute),
}
}
func (self Attributes) Add(name string, value interface{}) error {
attr := Attribute{}
switch el := value.(type) {
case string:
attr.Type = "string"
attr.Value = el
case int:
attr.Type = "int"
attr.Value = strconv.FormatInt(int64(el), 10)
case int64:
attr.Type = "int"
attr.Value = strconv.FormatInt(el, 10)
case float32:
attr.Type = "float"
attr.Value = strconv.FormatFloat(float64(el), 'f', -1, 32)
case float64:
attr.Type = "int"
attr.Value = strconv.FormatFloat(float64(el), 'f', -1, 64)
case Attribute:
attr = el
default:
return fmt.Errorf("unsupported implicit type")
}
self.values[name] = attr
return nil
}
func (self Attributes) Get(name string) (Attribute, bool) {
entry, ok := self.values[name]
return entry, ok
}
func (self Attributes) GetString(name string) (string, bool) {
entry, ok := self.values[name]
if ok {
return entry.Value, true
}
return "", false
}
func (self Attributes) GetInt(name string) (int64, bool) {
entry, ok := self.values[name]
if ok {
value, err := strconv.ParseInt(entry.Value, 10, 64)
if err != nil {
return 0, true
}
return value, true
}
return 0, false
}
func (self Attributes) GetFloat(name string) (float64, bool) {
entry, ok := self.values[name]
if ok {
value, err := strconv.ParseFloat(entry.Value, 64)
if err != nil {
return 0, true
}
return value, true
}
return 0, false
}
func (self Attributes) toWire() wireAttributes {
var attrs []wireAttribute
for key, value := range self.values {
attr := wireAttribute{
Name: key,
Type: value.Type,
Value: value.Value,
}
attrs = append(attrs, attr)
}
return wireAttributes{attrs}
}
type Entity interface {
Id() string
Type() string
Attributes() Attributes
SetAttributes(Attributes)
}
type EntityFactory func(etype, id string) Entity
type Page uint
func (self Page) Next() Page {
return Page(uint(self) + 1)
}
type Server struct {
server_url string
}
func NewServer(u string) *Server {
return &Server{
strings.TrimSuffix(u, "/"),
}
}
type wireAttribute struct {
Name string `json:"name"`
Type string `json:"type"`
Value string `json:"value"`
}
type wireAttributes struct {
Attributes []wireAttribute `json:"attributes"`
}
func (self wireAttributes) toAttributes() Attributes {
attrs := NewAttributes()
for _, el := range self.Attributes {
attrs.Add(el.Name, Attribute{
Type: el.Type,
Value: el.Value,
})
}
return attrs
}
type wireId struct {
Id string `json:"id"`
IsPattern bool `json:"isPattern,string"`
Type string `json:"type"`
}
type wireStatus struct {
Code uint `json:"code,string"`
Message string `json:"reasonPhrase"`
}
type wireAlteredContextElement struct {
wireAttributes
wireStatus `json:"statusCode"`
}
type wireAlteredContextResponse struct {
Elements []wireAlteredContextElement `json:"contextResponses"`
wireId
}
type wireQueryContextElement struct {
ContextElement struct {
wireAttributes
wireId
} `json:"contextElement"`
wireStatus `json:"statusCode"`
}
type wireQueryContextResponse struct {
Elements []wireQueryContextElement `json:"contextResponses"`
}
func (self *Server) NewEntity(e Entity) error {
var result wireAlteredContextResponse
u := fmt.Sprintf("/v1/contextEntities/type/%s/id/%s", e.Type(), e.Id())
err := self.post(u, e.Attributes().toWire(), &result)
if err != nil {
return err
}
status := result.Elements[0]
if status.Code != 200 {
return fmt.Errorf("entity creation failed. code=%d message=%s", status.Code, status.Message)
}
return nil
}
func (self *Server) DeleteEntity(e Entity) error {
u := fmt.Sprintf("/v1/contextEntities/type/%s/id/%s", e.Type(), e.Id())
response := wireStatus{}
err := self.delete(u, &response)
if err != nil {
return err
}
if response.Code != 200 {
return fmt.Errorf("entity deletion failed. code=%d message=%s", response.Code, response.Message)
}
return nil
}
func (self *Server) UpdateEntity(e Entity) error {
var result wireAlteredContextResponse
u := fmt.Sprintf("/v1/contextEntities/type/%s/id/%s", e.Type(), e.Id())
err := self.put(u, e.Attributes().toWire(), &result)
if err != nil {
return err
}
if len(result.Elements) < 1 {
log.Println(result)
return fmt.Errorf("unexpected result")
}
status := result.Elements[0]
if status.Code != 200 {
return fmt.Errorf("entity creation failed. code=%d message=%s", status.Code, status.Message)
}
return nil
}
func (self *Server) EntitiesByType(entity_type string, page Page, f EntityFactory) ([]Entity, error) {
limit := int64(100)
offset := int64(page) * limit
u := fmt.Sprintf("/v1/contextEntityTypes/%s?limit=%s&offset=%s",
entity_type,
url.QueryEscape(strconv.FormatInt(limit, 10)),
url.QueryEscape(strconv.FormatInt(offset, 10)))
result := wireQueryContextResponse{}
err := self.get(u, &result)
if err != nil {
return nil, err
}
var output []Entity
for _, el := range result.Elements {
ctx := &el.ContextElement
entity := f(ctx.Type, ctx.Id)
entity.SetAttributes(ctx.wireAttributes.toAttributes())
output = append(output, entity)
}
return output, nil
}
func (self *Server) AllEntitiesByType(entity_type string, f EntityFactory) ([]Entity, error) {
var output []Entity
page := Page(0)
for {
chunk, err := self.EntitiesByType(entity_type, page, f)
if err != nil {
return output, err
}
if len(chunk) == 0 {
break
}
for _, el := range chunk {
output = append(output, el)
}
page = page.Next()
}
return output, nil
}
func (self *Server) EntityById(e Entity) error {
u := fmt.Sprintf("/v1/contextEntities/type/%s/id/%s", e.Type(), e.Id())
result := wireQueryContextElement{}
err := self.get(u, &result)
if err != nil {
return err
}
if result.Code != 200 {
return fmt.Errorf("entity lookup failed. code=%d message=%s", result.Code, result.Message)
}
e.SetAttributes(result.ContextElement.wireAttributes.toAttributes())
return nil
}
func (self *Server) CheckEntity(eType string, eID string) (r bool) {
u := fmt.Sprintf("/v1/contextEntities/type/%s/id/%s", eType, eID)
result := wireQueryContextElement{}
err := self.get(u, &result)
r = err == nil && result.Code == 200
return
}
func (self *Server) get(path string, response interface{}) error {
u := self.server_url + path
req, err := http.NewRequest("GET", u, nil)
if err != nil {
return err
}
req.Header.Set("Accept", "application/json")
return self.do(req, response)
}
func (self *Server) post(path string, body interface{}, response interface{}) error {
octets, err := json.Marshal(body)
if err != nil {
return err
}
u := self.server_url + path
req, err := http.NewRequest("POST", u, bytes.NewReader(octets))
if err != nil {
return err
}
req.Header.Set("Accept", "application/json")
req.Header.Set("Content-Type", "application/json")
return self.do(req, response)
}
func (self *Server) put(path string, body interface{}, response interface{}) error {
octets, err := json.Marshal(body)
if err != nil {
return err
}
u := self.server_url + path
req, err := http.NewRequest("PUT", u, bytes.NewReader(octets))
if err != nil {
return err
}
req.Header.Set("Accept", "application/json")
req.Header.Set("Content-Type", "application/json")
return self.do(req, response)
}
func (self *Server) delete(path string, response interface{}) error {
u := self.server_url + path
req, err := http.NewRequest("DELETE", u, nil)
if err != nil {
return err
}
req.Header.Set("Accept", "application/json")
return self.do(req, response)
}
func (self *Server) do(req *http.Request, response interface{}) error {
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
octets, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
err = json.Unmarshal(octets, response)
if err != nil {
return err
}
return nil
}