[WIP] Initial commit

vendor/github.com/cockroachdb/errors/issuelink/issuelink.go

@@ -0,0 +1,119 @@
+// Copyright 2019 The Cockroach Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+// implied. See the License for the specific language governing
+// permissions and limitations under the License.
+
+package issuelink
+
+import (
+	"fmt"
+
+	"github.com/cockroachdb/errors/errbase"
+	"github.com/cockroachdb/errors/markers"
+)
+
+// WithIssueLink adds an annotation to a know issue
+// on a web issue tracker.
+//
+// The url and detail strings may contain PII and will
+// be considered reportable.
+//
+// Detail is shown:
+// - via `errors.GetSafeDetails()`
+// - when formatting with `%+v`.
+// - in Sentry reports.
+// - via `errors.GetAllHints()` / `errors.FlattenHints()`
+func WithIssueLink(err error, issue IssueLink) error {
+	if err == nil {
+		return nil
+	}
+	return &withIssueLink{cause: err, IssueLink: issue}
+}
+
+// HasIssueLink returns true iff the error or one of its
+// causes has a linked issue payload.
+func HasIssueLink(err error) bool {
+	_, ok := markers.If(err, func(err error) (v interface{}, ok bool) {
+		v, ok = err.(*withIssueLink)
+		return
+	})
+	return ok
+}
+
+// IsIssueLink returns true iff the error (not its
+// causes) has a linked issue payload.
+func IsIssueLink(err error) bool {
+	_, ok := err.(*withIssueLink)
+	return ok
+}
+
+// GetAllIssueLinks retrieves the linked issue carried
+// by the error or its direct causes.
+func GetAllIssueLinks(err error) (issues []IssueLink) {
+	for ; err != nil; err = errbase.UnwrapOnce(err) {
+		if issue, ok := GetIssueLink(err); ok {
+			issues = append(issues, issue)
+		}
+	}
+	return
+}
+
+// UnimplementedError creates a new leaf error that indicates that
+// some feature was not (yet) implemented.
+//
+// Detail is shown:
+// - via `errors.GetSafeDetails()`
+// - when formatting with `%+v`.
+// - in Sentry reports.
+// - via `errors.GetAllHints()` / `errors.FlattenHints()`
+func UnimplementedError(issueLink IssueLink, msg string) error {
+	return &unimplementedError{IssueLink: issueLink, msg: msg}
+}
+
+// UnimplementedErrorf creates a new leaf error that indicates that
+// some feature was not (yet) implemented. The message is formatted.
+func UnimplementedErrorf(issueLink IssueLink, format string, args ...interface{}) error {
+	return &unimplementedError{IssueLink: issueLink, msg: fmt.Sprintf(format, args...)}
+}
+
+// IsUnimplementedError returns iff if err is an unimplemented error.
+func IsUnimplementedError(err error) bool {
+	_, ok := err.(*unimplementedError)
+	return ok
+}
+
+// HasUnimplementedError returns iff if err or its cause is an
+// unimplemented error.
+func HasUnimplementedError(err error) bool {
+	_, ok := errbase.UnwrapAll(err).(*unimplementedError)
+	return ok
+}
+
+// GetIssueLink retrieves the linked issue annotation carried
+// by the error, or false if there is no such annotation.
+func GetIssueLink(err error) (IssueLink, bool) {
+	switch w := err.(type) {
+	case *withIssueLink:
+		return w.IssueLink, true
+	case *unimplementedError:
+		return w.IssueLink, true
+	}
+	return IssueLink{}, false
+}
+
+// IssueLink is the payload for a linked issue annotation.
+type IssueLink struct {
+	// URL to the issue on a tracker.
+	IssueURL string
+	// Annotation that characterizes a sub-issue.
+	Detail string
+}