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Return remote API errors as JSON

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Signed-off-by: Ben Firshman <ben@firshman.co.uk>
This commit is contained in:
Ben Firshman 2016-05-21 12:56:04 +01:00
parent f6ff9acc63
commit 322e2a7d05
13 changed files with 135 additions and 59 deletions
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25
api/server/httputils/errors.go
View file

@ -5,6 +5,9 @@ import (
"strings"
"github.com/Sirupsen/logrus"
"github.com/docker/engine-api/types"
"github.com/docker/engine-api/types/versions"
"github.com/gorilla/mux"
)
// httpStatusError is an interface
@ -70,13 +73,19 @@ func GetHTTPErrorStatusCode(err error) int {
return statusCode
}
// WriteError decodes a specific docker error and sends it in the response.
func WriteError(w http.ResponseWriter, err error) {
if err == nil || w == nil {
logrus.WithFields(logrus.Fields{"error": err, "writer": w}).Error("unexpected HTTP error handling")
return
// MakeErrorHandler makes an HTTP handler that decodes a Docker error and
// returns it in the response.
func MakeErrorHandler(err error) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
statusCode := GetHTTPErrorStatusCode(err)
vars := mux.Vars(r)
if vars["version"] == "" || versions.GreaterThan(vars["version"], "1.23") {
response := &types.ErrorResponse{
Message: err.Error(),
}
WriteJSON(w, statusCode, response)
} else {
http.Error(w, err.Error(), statusCode)
}
}
statusCode := GetHTTPErrorStatusCode(err)
http.Error(w, err.Error(), statusCode)
}

9
api/server/server.go
View file

@ -2,6 +2,7 @@ package server
import (
"crypto/tls"
"fmt"
"net"
"net/http"
"strings"
@ -10,6 +11,7 @@ import (
"github.com/docker/docker/api/server/httputils"
"github.com/docker/docker/api/server/middleware"
"github.com/docker/docker/api/server/router"
"github.com/docker/docker/errors"
"github.com/gorilla/mux"
"golang.org/x/net/context"
)
@ -136,7 +138,7 @@ func (s *Server) makeHTTPHandler(handler httputils.APIFunc) http.HandlerFunc {
if err := handlerFunc(ctx, w, r, vars); err != nil {
logrus.Errorf("Handler for %s %s returned error: %v", r.Method, r.URL.Path, err)
httputils.WriteError(w, err)
httputils.MakeErrorHandler(err)(w, r)
}
}
}
@ -172,6 +174,11 @@ func (s *Server) createMux() *mux.Router {
}
}
err := errors.NewRequestNotFoundError(fmt.Errorf("page not found"))
notFoundHandler := httputils.MakeErrorHandler(err)
m.HandleFunc(versionMatcher+"/{path:.*}", notFoundHandler)
m.NotFoundHandler = notFoundHandler
return m
}

2
docs/reference/api/docker_remote_api.md
View file

@ -131,6 +131,7 @@ This section lists each version from latest to oldest. Each listing includes a
* `POST /images/(name)/tag` no longer has a `force` query parameter.
* `GET /images/search` now supports maximum returned search results `limit`.
* `POST /containers/{name:.*}/copy` is now removed and errors out starting from this API version.
* API errors are now returned as JSON instead of plain text.
### v1.23 API changes
@ -262,4 +263,3 @@ end point now returns the new boolean fields `CpuCfsPeriod`, `CpuCfsQuota`, and
* `CgroupParent` can be passed in the host config to setup container cgroups under a specific cgroup.
* `POST /build` closing the HTTP request cancels the build
* `POST /containers/(id)/exec` includes `Warnings` field to response.

30
docs/reference/api/docker_remote_api_v1.24.md
View file

@ -22,9 +22,19 @@ weight=-5
- When the client API version is newer than the daemon's, these calls return an HTTP
`400 Bad Request` error message.
# 2. Endpoints
# 2. Errors
## 2.1 Containers
The Remote API uses standard HTTP status codes to indicate the success or failure of the API call. The body of the response will be JSON in the following format:
{
"message": "page not found"
}
The status codes that are returned for each endpoint are specified in the endpoint documentation below.
# 3. Endpoints
## 3.1 Containers
### List containers
@ -1504,7 +1514,7 @@ Status Codes:
- no such file or directory (**path** resource does not exist)
- **500** – server error
## 2.2 Images
## 3.2 Images
### List Images
@ -2112,7 +2122,7 @@ Status Codes:
- **200** – no error
- **500** – server error
## 2.3 Misc
## 3.3 Misc
### Check auth configuration
@ -2834,7 +2844,7 @@ Status Codes:
- **404** – no such exec instance
- **500** - server error
## 2.4 Volumes
## 3.4 Volumes
### List volumes
@ -2972,7 +2982,7 @@ Status Codes
- **409** - volume is in use and cannot be removed
- **500** - server error
## 2.5 Networks
## 3.5 Networks
### List networks
@ -3296,9 +3306,9 @@ Status Codes
- **404** - no such network
- **500** - server error
# 3. Going further
# 4. Going further
## 3.1 Inside `docker run`
## 4.1 Inside `docker run`
As an example, the `docker run` command line makes the following API calls:
@ -3316,7 +3326,7 @@ As an example, the `docker run` command line makes the following API calls:
- If in detached mode or only `stdin` is attached, display the container's id.
## 3.2 Hijacking
## 4.2 Hijacking
In this version of the API, `/attach`, uses hijacking to transport `stdin`,
`stdout`, and `stderr` on the same socket.
@ -3331,7 +3341,7 @@ When Docker daemon detects the `Upgrade` header, it switches its status code
from **200 OK** to **101 UPGRADED** and resends the same headers.
## 3.3 CORS Requests
## 4.3 CORS Requests
To set cross origin requests to the remote api please give values to
`--api-cors-header` when running Docker in daemon mode. Set * (asterisk) allows all,

4
integration-cli/docker_api_attach_test.go
View file

@ -85,8 +85,8 @@ func (s *DockerSuite) TestGetContainersWsAttachContainerNotFound(c *check.C) {
status, body, err := sockRequest("GET", "/containers/doesnotexist/attach/ws", nil)
c.Assert(status, checker.Equals, http.StatusNotFound)
c.Assert(err, checker.IsNil)
expected := "No such container: doesnotexist\n"
c.Assert(string(body), checker.Contains, expected)
expected := "No such container: doesnotexist"
c.Assert(getErrorMessage(c, body), checker.Contains, expected)
}
func (s *DockerSuite) TestPostContainersAttach(c *check.C) {

5
integration-cli/docker_api_auth_test.go
View file

@ -16,9 +16,10 @@ func (s *DockerSuite) TestAuthApi(c *check.C) {
Password: "no-password",
}
expected := "Get https://registry-1.docker.io/v2/: unauthorized: incorrect username or password\n"
expected := "Get https://registry-1.docker.io/v2/: unauthorized: incorrect username or password"
status, body, err := sockRequest("POST", "/auth", config)
c.Assert(err, check.IsNil)
c.Assert(status, check.Equals, http.StatusUnauthorized)
c.Assert(string(body), checker.Contains, expected, check.Commentf("Expected: %v, got: %v", expected, string(body)))
msg := getErrorMessage(c, body)
c.Assert(msg, checker.Contains, expected, check.Commentf("Expected: %v, got: %v", expected, msg))
}

44
integration-cli/docker_api_containers_test.go
View file

@ -480,10 +480,10 @@ func (s *DockerSuite) TestContainerApiBadPort(c *check.C) {
jsonData := bytes.NewBuffer(nil)
json.NewEncoder(jsonData).Encode(config)
status, b, err := sockRequest("POST", "/containers/create", config)
status, body, err := sockRequest("POST", "/containers/create", config)
c.Assert(err, checker.IsNil)
c.Assert(status, checker.Equals, http.StatusInternalServerError)
c.Assert(strings.TrimSpace(string(b)), checker.Equals, `Invalid port specification: "aa80"`, check.Commentf("Incorrect error msg: %s", string(b)))
c.Assert(getErrorMessage(c, body), checker.Equals, `Invalid port specification: "aa80"`, check.Commentf("Incorrect error msg: %s", body))
}
func (s *DockerSuite) TestContainerApiCreate(c *check.C) {
@ -509,12 +509,12 @@ func (s *DockerSuite) TestContainerApiCreate(c *check.C) {
func (s *DockerSuite) TestContainerApiCreateEmptyConfig(c *check.C) {
config := map[string]interface{}{}
status, b, err := sockRequest("POST", "/containers/create", config)
status, body, err := sockRequest("POST", "/containers/create", config)
c.Assert(err, checker.IsNil)
c.Assert(status, checker.Equals, http.StatusInternalServerError)
expected := "Config cannot be empty in order to create a container\n"
c.Assert(string(b), checker.Equals, expected)
expected := "Config cannot be empty in order to create a container"
c.Assert(getErrorMessage(c, body), checker.Equals, expected)
}
func (s *DockerSuite) TestContainerApiCreateMultipleNetworksConfig(c *check.C) {
@ -530,14 +530,15 @@ func (s *DockerSuite) TestContainerApiCreateMultipleNetworksConfig(c *check.C) {
},
}
status, b, err := sockRequest("POST", "/containers/create", config)
status, body, err := sockRequest("POST", "/containers/create", config)
c.Assert(err, checker.IsNil)
c.Assert(status, checker.Equals, http.StatusBadRequest)
msg := getErrorMessage(c, body)
// network name order in error message is not deterministic
c.Assert(string(b), checker.Contains, "Container cannot be connected to network endpoints")
c.Assert(string(b), checker.Contains, "net1")
c.Assert(string(b), checker.Contains, "net2")
c.Assert(string(b), checker.Contains, "net3")
c.Assert(msg, checker.Contains, "Container cannot be connected to network endpoints")
c.Assert(msg, checker.Contains, "net1")
c.Assert(msg, checker.Contains, "net2")
c.Assert(msg, checker.Contains, "net3")
}
func (s *DockerSuite) TestContainerApiCreateWithHostName(c *check.C) {
@ -997,7 +998,7 @@ func (s *DockerSuite) TestContainerApiDeleteNotExist(c *check.C) {
status, body, err := sockRequest("DELETE", "/containers/doesnotexist", nil)
c.Assert(err, checker.IsNil)
c.Assert(status, checker.Equals, http.StatusNotFound)
c.Assert(string(body), checker.Matches, "No such container: doesnotexist\n")
c.Assert(getErrorMessage(c, body), checker.Matches, "No such container: doesnotexist")
}
func (s *DockerSuite) TestContainerApiDeleteForce(c *check.C) {
@ -1247,8 +1248,8 @@ func (s *DockerSuite) TestPostContainersCreateWithWrongCpusetValues(c *check.C)
status, body, err := sockRequest("POST", "/containers/create?name="+name, c1)
c.Assert(err, checker.IsNil)
c.Assert(status, checker.Equals, http.StatusInternalServerError)
expected := "Invalid value 1-42,, for cpuset cpus\n"
c.Assert(string(body), checker.Equals, expected)
expected := "Invalid value 1-42,, for cpuset cpus"
c.Assert(getErrorMessage(c, body), checker.Equals, expected)
c2 := struct {
Image string
@ -1258,8 +1259,8 @@ func (s *DockerSuite) TestPostContainersCreateWithWrongCpusetValues(c *check.C)
status, body, err = sockRequest("POST", "/containers/create?name="+name, c2)
c.Assert(err, checker.IsNil)
c.Assert(status, checker.Equals, http.StatusInternalServerError)
expected = "Invalid value 42-3,1-- for cpuset mems\n"
c.Assert(string(body), checker.Equals, expected)
expected = "Invalid value 42-3,1-- for cpuset mems"
c.Assert(getErrorMessage(c, body), checker.Equals, expected)
}
func (s *DockerSuite) TestPostContainersCreateShmSizeNegative(c *check.C) {
@ -1273,7 +1274,7 @@ func (s *DockerSuite) TestPostContainersCreateShmSizeNegative(c *check.C) {
status, body, err := sockRequest("POST", "/containers/create", config)
c.Assert(err, check.IsNil)
c.Assert(status, check.Equals, http.StatusInternalServerError)
c.Assert(string(body), checker.Contains, "SHM size must be greater than 0")
c.Assert(getErrorMessage(c, body), checker.Contains, "SHM size must be greater than 0")
}
func (s *DockerSuite) TestPostContainersCreateShmSizeHostConfigOmitted(c *check.C) {
@ -1409,9 +1410,11 @@ func (s *DockerSuite) TestPostContainersCreateWithOomScoreAdjInvalidRange(c *che
status, b, err := sockRequest("POST", "/containers/create?name="+name, config)
c.Assert(err, check.IsNil)
c.Assert(status, check.Equals, http.StatusInternalServerError)
expected := "Invalid value 1001, range for oom score adj is [-1000, 1000]"
if !strings.Contains(string(b), expected) {
c.Fatalf("Expected output to contain %q, got %q", expected, string(b))
msg := getErrorMessage(c, b)
if !strings.Contains(msg, expected) {
c.Fatalf("Expected output to contain %q, got %q", expected, msg)
}
config = struct {
@ -1423,8 +1426,9 @@ func (s *DockerSuite) TestPostContainersCreateWithOomScoreAdjInvalidRange(c *che
c.Assert(err, check.IsNil)
c.Assert(status, check.Equals, http.StatusInternalServerError)
expected = "Invalid value -1001, range for oom score adj is [-1000, 1000]"
if !strings.Contains(string(b), expected) {
c.Fatalf("Expected output to contain %q, got %q", expected, string(b))
msg = getErrorMessage(c, b)
if !strings.Contains(msg, expected) {
c.Fatalf("Expected output to contain %q, got %q", expected, msg)
}
}

13
integration-cli/docker_api_create_test.go
View file

@ -2,7 +2,6 @@ package main
import (
"net/http"
"strings"
"github.com/docker/docker/pkg/integration/checker"
"github.com/go-check/check"
@ -15,31 +14,31 @@ func (s *DockerSuite) TestApiCreateWithNotExistImage(c *check.C) {
"Volumes": map[string]struct{}{"/tmp": {}},
}
status, resp, err := sockRequest("POST", "/containers/create?name="+name, config)
status, body, err := sockRequest("POST", "/containers/create?name="+name, config)
c.Assert(err, check.IsNil)
c.Assert(status, check.Equals, http.StatusNotFound)
expected := "No such image: test456:v1"
c.Assert(strings.TrimSpace(string(resp)), checker.Contains, expected)
c.Assert(getErrorMessage(c, body), checker.Contains, expected)
config2 := map[string]interface{}{
"Image": "test456",
"Volumes": map[string]struct{}{"/tmp": {}},
}
status, resp, err = sockRequest("POST", "/containers/create?name="+name, config2)
status, body, err = sockRequest("POST", "/containers/create?name="+name, config2)
c.Assert(err, check.IsNil)
c.Assert(status, check.Equals, http.StatusNotFound)
expected = "No such image: test456:latest"
c.Assert(strings.TrimSpace(string(resp)), checker.Equals, expected)
c.Assert(getErrorMessage(c, body), checker.Equals, expected)
config3 := map[string]interface{}{
"Image": "sha256:0cb40641836c461bc97c793971d84d758371ed682042457523e4ae701efeaaaa",
}
status, resp, err = sockRequest("POST", "/containers/create?name="+name, config3)
status, body, err = sockRequest("POST", "/containers/create?name="+name, config3)
c.Assert(err, check.IsNil)
c.Assert(status, check.Equals, http.StatusNotFound)
expected = "No such image: sha256:0cb40641836c461bc97c793971d84d758371ed682042457523e4ae701efeaaaa"
c.Assert(strings.TrimSpace(string(resp)), checker.Equals, expected)
c.Assert(getErrorMessage(c, body), checker.Equals, expected)
}

6
integration-cli/docker_api_exec_test.go
View file

@ -24,7 +24,7 @@ func (s *DockerSuite) TestExecApiCreateNoCmd(c *check.C) {
c.Assert(status, checker.Equals, http.StatusInternalServerError)
comment := check.Commentf("Expected message when creating exec command with no Cmd specified")
c.Assert(string(body), checker.Contains, "No exec command specified", comment)
c.Assert(getErrorMessage(c, body), checker.Contains, "No exec command specified", comment)
}
func (s *DockerSuite) TestExecApiCreateNoValidContentType(c *check.C) {
@ -44,7 +44,7 @@ func (s *DockerSuite) TestExecApiCreateNoValidContentType(c *check.C) {
c.Assert(err, checker.IsNil)
comment := check.Commentf("Expected message when creating exec command with invalid Content-Type specified")
c.Assert(string(b), checker.Contains, "Content-Type specified", comment)
c.Assert(getErrorMessage(c, b), checker.Contains, "Content-Type specified", comment)
}
func (s *DockerSuite) TestExecApiCreateContainerPaused(c *check.C) {
@ -59,7 +59,7 @@ func (s *DockerSuite) TestExecApiCreateContainerPaused(c *check.C) {
c.Assert(status, checker.Equals, http.StatusConflict)
comment := check.Commentf("Expected message when creating exec command with Container %s is paused", name)
c.Assert(string(body), checker.Contains, "Container "+name+" is paused, unpause the container before exec", comment)
c.Assert(getErrorMessage(c, body), checker.Contains, "Container "+name+" is paused, unpause the container before exec", comment)
}
func (s *DockerSuite) TestExecApiStart(c *check.C) {

4
integration-cli/docker_api_logs_test.go
View file

@ -60,9 +60,7 @@ func (s *DockerSuite) TestLogsApiNoStdoutNorStderr(c *check.C) {
c.Assert(err, checker.IsNil)
expected := "Bad parameters: you must choose at least one stream"
if !bytes.Contains(body, []byte(expected)) {
c.Fatalf("Expected %s, got %s", expected, string(body[:]))
}
c.Assert(getErrorMessage(c, body), checker.Contains, expected)
}
// Regression test for #12704

2
integration-cli/docker_api_resize_test.go
View file

@ -40,5 +40,5 @@ func (s *DockerSuite) TestResizeApiResponseWhenContainerNotStarted(c *check.C) {
c.Assert(status, check.Equals, http.StatusInternalServerError)
c.Assert(err, check.IsNil)
c.Assert(string(body), checker.Contains, "is not running", check.Commentf("resize should fail with message 'Container is not running'"))
c.Assert(getErrorMessage(c, body), checker.Contains, "is not running", check.Commentf("resize should fail with message 'Container is not running'"))
}

43
integration-cli/docker_api_test.go
View file

@ -60,7 +60,7 @@ func (s *DockerSuite) TestApiClientVersionNewerThanServer(c *check.C) {
c.Assert(err, checker.IsNil)
c.Assert(status, checker.Equals, http.StatusBadRequest)
expected := fmt.Sprintf("client is newer than server (client API version: %s, server API version: %s)", version, api.DefaultVersion)
c.Assert(strings.TrimSpace(string(body)), checker.Equals, expected)
c.Assert(getErrorMessage(c, body), checker.Equals, expected)
}
func (s *DockerSuite) TestApiClientVersionOldNotSupported(c *check.C) {
@ -99,3 +99,44 @@ func (s *DockerSuite) TestApiDockerApiVersion(c *check.C) {
c.Fatalf("Out didn't have 'xxx' for the API version, had:\n%s", out)
}
}
func (s *DockerSuite) TestApiErrorJSON(c *check.C) {
httpResp, body, err := sockRequestRaw("POST", "/containers/create", strings.NewReader(`{}`), "application/json")
c.Assert(err, checker.IsNil)
c.Assert(httpResp.StatusCode, checker.Equals, http.StatusInternalServerError)
c.Assert(httpResp.Header.Get("Content-Type"), checker.Equals, "application/json")
b, err := readBody(body)
c.Assert(err, checker.IsNil)
c.Assert(getErrorMessage(c, b), checker.Equals, "Config cannot be empty in order to create a container")
}
func (s *DockerSuite) TestApiErrorPlainText(c *check.C) {
httpResp, body, err := sockRequestRaw("POST", "/v1.23/containers/create", strings.NewReader(`{}`), "application/json")
c.Assert(err, checker.IsNil)
c.Assert(httpResp.StatusCode, checker.Equals, http.StatusInternalServerError)
c.Assert(httpResp.Header.Get("Content-Type"), checker.Contains, "text/plain")
b, err := readBody(body)
c.Assert(err, checker.IsNil)
c.Assert(strings.TrimSpace(string(b)), checker.Equals, "Config cannot be empty in order to create a container")
}
func (s *DockerSuite) TestApiErrorNotFoundJSON(c *check.C) {
// 404 is a different code path to normal errors, so test separately
httpResp, body, err := sockRequestRaw("GET", "/notfound", nil, "application/json")
c.Assert(err, checker.IsNil)
c.Assert(httpResp.StatusCode, checker.Equals, http.StatusNotFound)
c.Assert(httpResp.Header.Get("Content-Type"), checker.Equals, "application/json")
b, err := readBody(body)
c.Assert(err, checker.IsNil)
c.Assert(getErrorMessage(c, b), checker.Equals, "page not found")
}
func (s *DockerSuite) TestApiErrorNotFoundPlainText(c *check.C) {
httpResp, body, err := sockRequestRaw("GET", "/v1.23/notfound", nil, "application/json")
c.Assert(err, checker.IsNil)
c.Assert(httpResp.StatusCode, checker.Equals, http.StatusNotFound)
c.Assert(httpResp.Header.Get("Content-Type"), checker.Contains, "text/plain")
b, err := readBody(body)
c.Assert(err, checker.IsNil)
c.Assert(strings.TrimSpace(string(b)), checker.Equals, "page not found")
}

7
integration-cli/docker_utils.go
View file

@ -1507,3 +1507,10 @@ func waitForGoroutines(expected int) error {
}
}
}
// getErrorMessage returns the error message from an error API response
func getErrorMessage(c *check.C, body []byte) string {
var resp types.ErrorResponse
c.Assert(json.Unmarshal(body, &resp), check.IsNil)
return strings.TrimSpace(resp.Message)
}