138 lines
4.3 KiB
Go
138 lines
4.3 KiB
Go
package errcode
|
|
|
|
import (
|
|
"fmt"
|
|
"net/http"
|
|
"sort"
|
|
"sync"
|
|
)
|
|
|
|
var (
|
|
errorCodeToDescriptors = map[ErrorCode]ErrorDescriptor{}
|
|
idToDescriptors = map[string]ErrorDescriptor{}
|
|
groupToDescriptors = map[string][]ErrorDescriptor{}
|
|
)
|
|
|
|
var (
|
|
// ErrorCodeUnknown is a generic error that can be used as a last
|
|
// resort if there is no situation-specific error message that can be used
|
|
ErrorCodeUnknown = Register("errcode", ErrorDescriptor{
|
|
Value: "UNKNOWN",
|
|
Message: "unknown error",
|
|
Description: `Generic error returned when the error does not have an
|
|
API classification.`,
|
|
HTTPStatusCode: http.StatusInternalServerError,
|
|
})
|
|
|
|
// ErrorCodeUnsupported is returned when an operation is not supported.
|
|
ErrorCodeUnsupported = Register("errcode", ErrorDescriptor{
|
|
Value: "UNSUPPORTED",
|
|
Message: "The operation is unsupported.",
|
|
Description: `The operation was unsupported due to a missing
|
|
implementation or invalid set of parameters.`,
|
|
HTTPStatusCode: http.StatusMethodNotAllowed,
|
|
})
|
|
|
|
// ErrorCodeUnauthorized is returned if a request requires
|
|
// authentication.
|
|
ErrorCodeUnauthorized = Register("errcode", ErrorDescriptor{
|
|
Value: "UNAUTHORIZED",
|
|
Message: "authentication required",
|
|
Description: `The access controller was unable to authenticate
|
|
the client. Often this will be accompanied by a
|
|
Www-Authenticate HTTP response header indicating how to
|
|
authenticate.`,
|
|
HTTPStatusCode: http.StatusUnauthorized,
|
|
})
|
|
|
|
// ErrorCodeDenied is returned if a client does not have sufficient
|
|
// permission to perform an action.
|
|
ErrorCodeDenied = Register("errcode", ErrorDescriptor{
|
|
Value: "DENIED",
|
|
Message: "requested access to the resource is denied",
|
|
Description: `The access controller denied access for the
|
|
operation on a resource.`,
|
|
HTTPStatusCode: http.StatusForbidden,
|
|
})
|
|
|
|
// ErrorCodeUnavailable provides a common error to report unavialability
|
|
// of a service or endpoint.
|
|
ErrorCodeUnavailable = Register("errcode", ErrorDescriptor{
|
|
Value: "UNAVAILABLE",
|
|
Message: "service unavailable",
|
|
Description: "Returned when a service is not available",
|
|
HTTPStatusCode: http.StatusServiceUnavailable,
|
|
})
|
|
|
|
// ErrorCodeTooManyRequests is returned if a client attempts too many
|
|
// times to contact a service endpoint.
|
|
ErrorCodeTooManyRequests = Register("errcode", ErrorDescriptor{
|
|
Value: "TOOMANYREQUESTS",
|
|
Message: "too many requests",
|
|
Description: `Returned when a client attempts to contact a
|
|
service too many times`,
|
|
HTTPStatusCode: http.StatusTooManyRequests,
|
|
})
|
|
)
|
|
|
|
var nextCode = 1000
|
|
var registerLock sync.Mutex
|
|
|
|
// Register will make the passed-in error known to the environment and
|
|
// return a new ErrorCode
|
|
func Register(group string, descriptor ErrorDescriptor) ErrorCode {
|
|
registerLock.Lock()
|
|
defer registerLock.Unlock()
|
|
|
|
descriptor.Code = ErrorCode(nextCode)
|
|
|
|
if _, ok := idToDescriptors[descriptor.Value]; ok {
|
|
panic(fmt.Sprintf("ErrorValue %q is already registered", descriptor.Value))
|
|
}
|
|
if _, ok := errorCodeToDescriptors[descriptor.Code]; ok {
|
|
panic(fmt.Sprintf("ErrorCode %v is already registered", descriptor.Code))
|
|
}
|
|
|
|
groupToDescriptors[group] = append(groupToDescriptors[group], descriptor)
|
|
errorCodeToDescriptors[descriptor.Code] = descriptor
|
|
idToDescriptors[descriptor.Value] = descriptor
|
|
|
|
nextCode++
|
|
return descriptor.Code
|
|
}
|
|
|
|
type byValue []ErrorDescriptor
|
|
|
|
func (a byValue) Len() int { return len(a) }
|
|
func (a byValue) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
|
|
func (a byValue) Less(i, j int) bool { return a[i].Value < a[j].Value }
|
|
|
|
// GetGroupNames returns the list of Error group names that are registered
|
|
func GetGroupNames() []string {
|
|
keys := []string{}
|
|
|
|
for k := range groupToDescriptors {
|
|
keys = append(keys, k)
|
|
}
|
|
sort.Strings(keys)
|
|
return keys
|
|
}
|
|
|
|
// GetErrorCodeGroup returns the named group of error descriptors
|
|
func GetErrorCodeGroup(name string) []ErrorDescriptor {
|
|
desc := groupToDescriptors[name]
|
|
sort.Sort(byValue(desc))
|
|
return desc
|
|
}
|
|
|
|
// GetErrorAllDescriptors returns a slice of all ErrorDescriptors that are
|
|
// registered, irrespective of what group they're in
|
|
func GetErrorAllDescriptors() []ErrorDescriptor {
|
|
result := []ErrorDescriptor{}
|
|
|
|
for _, group := range GetGroupNames() {
|
|
result = append(result, GetErrorCodeGroup(group)...)
|
|
}
|
|
sort.Sort(byValue(result))
|
|
return result
|
|
}
|