invalid memory address or nil pointer dereference with mgo
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"gopkg.in/mgo.v2"
)
type DataIg struct {
Member string `json:"Member"`
Timestamp float64 `json:"Timestamp"`
Name string `json:"Name"`
Bid string `json:"Bid"`
Offer string`json:"Offer"`
Change string `json:"Change"`
Hour string `json:"Hour"`
}
type Response struct {
Status string
}
var session *mgo.Session
var c *mgo.Collection
func postData(w http.ResponseWriter, r *http.Request) {
var response = Response{}
response.Status = "ok"
var reception = DataIg{}
err := c.Insert(reception)
body, err := ioutil.ReadAll(r.Body)
if err != nil {
panic(err)
}
err = json.Unmarshal(body, &reception)
fmt.Println(reception)
js, err := json.Marshal(response)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(js)
}
var appName = "accountservice"
func main() {
session, _ := mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/")
session.SetMode(mgo.Monotonic, true)
c = session.DB("database").C("igData")
fmt.Printf("Starting %vn", appName)
router := mux.NewRouter()
router.HandleFunc("/postData", postData).Methods("POST")
corsObj := handlers.AllowedOrigins(string{"*"})
http.ListenAndServe(":8066", handlers.CORS(corsObj)(router))
defer session.Close()
}
I am trying to make the session and the connection (c) global to use them in another function other than PostData.
But i have a :
panic: runtime error: invalid memory address or nil pointer
dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x0
pc=0x683587]
here :
session, _ := mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/")
I would like to have the collection on a global way to use it outside the main func.
Regards
go mgo
asked Nov 15 '18 at 20:43
user462794user462794
25431951
add a comment |
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"gopkg.in/mgo.v2"
)
type DataIg struct {
Member string `json:"Member"`
Timestamp float64 `json:"Timestamp"`
Name string `json:"Name"`
Bid string `json:"Bid"`
Offer string`json:"Offer"`
Change string `json:"Change"`
Hour string `json:"Hour"`
}
type Response struct {
Status string
}
var session *mgo.Session
var c *mgo.Collection
func postData(w http.ResponseWriter, r *http.Request) {
var response = Response{}
response.Status = "ok"
var reception = DataIg{}
err := c.Insert(reception)
body, err := ioutil.ReadAll(r.Body)
if err != nil {
panic(err)
}
err = json.Unmarshal(body, &reception)
fmt.Println(reception)
js, err := json.Marshal(response)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(js)
}
var appName = "accountservice"
func main() {
session, _ := mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/")
session.SetMode(mgo.Monotonic, true)
c = session.DB("database").C("igData")
fmt.Printf("Starting %vn", appName)
router := mux.NewRouter()
router.HandleFunc("/postData", postData).Methods("POST")
corsObj := handlers.AllowedOrigins(string{"*"})
http.ListenAndServe(":8066", handlers.CORS(corsObj)(router))
defer session.Close()
}
I am trying to make the session and the connection (c) global to use them in another function other than PostData.
But i have a :
panic: runtime error: invalid memory address or nil pointer
dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x0
pc=0x683587]
here :
session, _ := mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/")
I would like to have the collection on a global way to use it outside the main func.
Regards
go mgo
asked Nov 15 '18 at 20:43
user462794user462794
25431951
4
Don't ignore the error returned bymgo.Dial().
– icza
Nov 15 '18 at 21:00
Any time you encounter an problem in Go, check to see if you're ignoring any errors anywhere around it, and stop ignoring them. There's a good chance the errors will explain what's going on.
– Adrian
Nov 15 '18 at 22:00
add a comment |
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"gopkg.in/mgo.v2"
)
type DataIg struct {
Member string `json:"Member"`
Timestamp float64 `json:"Timestamp"`
Name string `json:"Name"`
Bid string `json:"Bid"`
Offer string`json:"Offer"`
Change string `json:"Change"`
Hour string `json:"Hour"`
}
type Response struct {
Status string
}
var session *mgo.Session
var c *mgo.Collection
func postData(w http.ResponseWriter, r *http.Request) {
var response = Response{}
response.Status = "ok"
var reception = DataIg{}
err := c.Insert(reception)
body, err := ioutil.ReadAll(r.Body)
if err != nil {
panic(err)
}
err = json.Unmarshal(body, &reception)
fmt.Println(reception)
js, err := json.Marshal(response)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(js)
}
var appName = "accountservice"
func main() {
session, _ := mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/")
session.SetMode(mgo.Monotonic, true)
c = session.DB("database").C("igData")
fmt.Printf("Starting %vn", appName)
router := mux.NewRouter()
router.HandleFunc("/postData", postData).Methods("POST")
corsObj := handlers.AllowedOrigins(string{"*"})
http.ListenAndServe(":8066", handlers.CORS(corsObj)(router))
defer session.Close()
}
I am trying to make the session and the connection (c) global to use them in another function other than PostData.
But i have a :
panic: runtime error: invalid memory address or nil pointer
dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x0
pc=0x683587]
here :
session, _ := mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/")
I would like to have the collection on a global way to use it outside the main func.
Regards
go mgo
asked Nov 15 '18 at 20:43
user462794user462794
25431951
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"gopkg.in/mgo.v2"
)
type DataIg struct {
Member string `json:"Member"`
Timestamp float64 `json:"Timestamp"`
Name string `json:"Name"`
Bid string `json:"Bid"`
Offer string`json:"Offer"`
Change string `json:"Change"`
Hour string `json:"Hour"`
}
type Response struct {
Status string
}
var session *mgo.Session
var c *mgo.Collection
func postData(w http.ResponseWriter, r *http.Request) {
var response = Response{}
response.Status = "ok"
var reception = DataIg{}
err := c.Insert(reception)
body, err := ioutil.ReadAll(r.Body)
if err != nil {
panic(err)
}
err = json.Unmarshal(body, &reception)
fmt.Println(reception)
js, err := json.Marshal(response)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(js)
}
var appName = "accountservice"
func main() {
session, _ := mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/")
session.SetMode(mgo.Monotonic, true)
c = session.DB("database").C("igData")
fmt.Printf("Starting %vn", appName)
router := mux.NewRouter()
router.HandleFunc("/postData", postData).Methods("POST")
corsObj := handlers.AllowedOrigins(string{"*"})
http.ListenAndServe(":8066", handlers.CORS(corsObj)(router))
defer session.Close()
}
I am trying to make the session and the connection (c) global to use them in another function other than PostData.
But i have a :
panic: runtime error: invalid memory address or nil pointer
dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x0
pc=0x683587]
here :
session, _ := mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/")
I would like to have the collection on a global way to use it outside the main func.
Regards
go mgo
go mgo
asked Nov 15 '18 at 20:43
user462794user462794
25431951
asked Nov 15 '18 at 20:43
user462794user462794
25431951
edited Nov 15 '18 at 21:25
user462794
asked Nov 15 '18 at 20:43
user462794user462794
25431951
asked Nov 15 '18 at 20:43
user462794user462794
25431951
asked Nov 15 '18 at 20:43
user462794user462794
25431951
25431951
4
Don't ignore the error returned bymgo.Dial().
– icza
Nov 15 '18 at 21:00
Any time you encounter an problem in Go, check to see if you're ignoring any errors anywhere around it, and stop ignoring them. There's a good chance the errors will explain what's going on.
– Adrian
Nov 15 '18 at 22:00
add a comment |
4
Don't ignore the error returned bymgo.Dial().
– icza
Nov 15 '18 at 21:00
Any time you encounter an problem in Go, check to see if you're ignoring any errors anywhere around it, and stop ignoring them. There's a good chance the errors will explain what's going on.
– Adrian
Nov 15 '18 at 22:00
4
4
Don't ignore the error returned by
mgo.Dial().– icza
Nov 15 '18 at 21:00
Don't ignore the error returned by
mgo.Dial().– icza
Nov 15 '18 at 21:00
Any time you encounter an problem in Go, check to see if you're ignoring any errors anywhere around it, and stop ignoring them. There's a good chance the errors will explain what's going on.
– Adrian
Nov 15 '18 at 22:00
Any time you encounter an problem in Go, check to see if you're ignoring any errors anywhere around it, and stop ignoring them. There's a good chance the errors will explain what's going on.
– Adrian
Nov 15 '18 at 22:00
add a comment |
1 Answer
1
active
oldest
votes
I haven't used mgo extensively, however I can tell you that ignoring the error from session, _ = mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/") is a bad idea.
It's likely that session is nil because the returned err is set.
answered Nov 15 '18 at 21:09
poypoy
6,53763365
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
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oldest
votes
active
oldest
votes
I haven't used mgo extensively, however I can tell you that ignoring the error from session, _ = mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/") is a bad idea.
It's likely that session is nil because the returned err is set.
answered Nov 15 '18 at 21:09
poypoy
6,53763365
add a comment |
I haven't used mgo extensively, however I can tell you that ignoring the error from session, _ = mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/") is a bad idea.
It's likely that session is nil because the returned err is set.
answered Nov 15 '18 at 21:09
poypoy
6,53763365
add a comment |
I haven't used mgo extensively, however I can tell you that ignoring the error from session, _ = mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/") is a bad idea.
It's likely that session is nil because the returned err is set.
answered Nov 15 '18 at 21:09
poypoy
6,53763365
I haven't used mgo extensively, however I can tell you that ignoring the error from session, _ = mgo.Dial("mongodb://toto:titib@56.39.92.666:27017/") is a bad idea.
It's likely that session is nil because the returned err is set.
answered Nov 15 '18 at 21:09
poypoy
6,53763365
answered Nov 15 '18 at 21:09
poypoy
6,53763365
answered Nov 15 '18 at 21:09
poypoy
6,53763365
answered Nov 15 '18 at 21:09
poypoy
6,53763365
6,53763365
add a comment |
add a comment |
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4
Don't ignore the error returned by
mgo.Dial().– icza
Nov 15 '18 at 21:00
Any time you encounter an problem in Go, check to see if you're ignoring any errors anywhere around it, and stop ignoring them. There's a good chance the errors will explain what's going on.
– Adrian
Nov 15 '18 at 22:00