internal/derrors: add package
Package derrors is added for error handling in this module.
Change-Id: Ie98945e9c9dc148ee6dfeecbcce827790d116ac7
Reviewed-on: https://go-review.googlesource.com/c/pkgsite-metrics/+/463615
Run-TryBot: Julie Qiu <julieqiu@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Julie Qiu <julieqiu@google.com>
diff --git a/go.mod b/go.mod
index f071dc6..12f9fc2 100644
--- a/go.mod
+++ b/go.mod
@@ -3,15 +3,33 @@
go 1.18
require (
+ cloud.google.com/go/errorreporting v0.3.0
github.com/client9/misspell v0.3.4
honnef.co/go/tools v0.3.3
mvdan.cc/unparam v0.0.0-20230125043941-70a0ce6e7b95
)
require (
+ cloud.google.com/go/compute v1.12.1 // indirect
+ cloud.google.com/go/compute/metadata v0.2.1 // indirect
github.com/BurntSushi/toml v0.4.1 // indirect
+ github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
+ github.com/golang/protobuf v1.5.2 // indirect
+ github.com/google/go-cmp v0.5.9 // indirect
+ github.com/googleapis/enterprise-certificate-proxy v0.2.0 // indirect
+ github.com/googleapis/gax-go/v2 v2.7.0 // indirect
+ go.opencensus.io v0.23.0 // indirect
golang.org/x/exp/typeparams v0.0.0-20220218215828-6cf2b201936e // indirect
golang.org/x/mod v0.7.0 // indirect
+ golang.org/x/net v0.5.0 // indirect
+ golang.org/x/oauth2 v0.0.0-20221014153046-6fdb5e3db783 // indirect
+ golang.org/x/sync v0.1.0 // indirect
golang.org/x/sys v0.4.0 // indirect
+ golang.org/x/text v0.6.0 // indirect
golang.org/x/tools v0.5.0 // indirect
+ google.golang.org/api v0.102.0 // indirect
+ google.golang.org/appengine v1.6.7 // indirect
+ google.golang.org/genproto v0.0.0-20221024183307-1bc688fe9f3e // indirect
+ google.golang.org/grpc v1.50.1 // indirect
+ google.golang.org/protobuf v1.28.1 // indirect
)
diff --git a/go.sum b/go.sum
index 50533cd..01fb6ec 100644
--- a/go.sum
+++ b/go.sum
@@ -1,18 +1,143 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.105.0 h1:DNtEKRBAAzeS4KyIory52wWHuClNaXJ5x1F7xa4q+5Y=
+cloud.google.com/go/compute v1.12.1 h1:gKVJMEyqV5c/UnpzjjQbo3Rjvvqpr9B1DFSbJC4OXr0=
+cloud.google.com/go/compute v1.12.1/go.mod h1:e8yNOBcBONZU1vJKCvCoDw/4JQsA0dpM4x/6PIIOocU=
+cloud.google.com/go/compute/metadata v0.2.1 h1:efOwf5ymceDhK6PKMnnrTHP4pppY5L22mle96M1yP48=
+cloud.google.com/go/compute/metadata v0.2.1/go.mod h1:jgHgmJd2RKBGzXqF5LR2EZMGxBkeanZ9wwa75XHJgOM=
+cloud.google.com/go/errorreporting v0.3.0 h1:kj1XEWMu8P0qlLhm3FwcaFsUvXChV/OraZwA70trRR0=
+cloud.google.com/go/errorreporting v0.3.0/go.mod h1:xsP2yaAp+OAW4OIm60An2bbLpqIhKXdWR/tawvl7QzU=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/BurntSushi/toml v0.4.1 h1:GaI7EiDXDRfa8VshkTj7Fym7ha+y8/XxIgD2okUIjLw=
github.com/BurntSushi/toml v0.4.1/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/client9/misspell v0.3.4 h1:ta993UF76GwbvJcIo3Y68y/M3WxlpEHPWIGDkJYwzJI=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
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diff --git a/internal/derrors/derrors.go b/internal/derrors/derrors.go
new file mode 100644
index 0000000..bc29af1
--- /dev/null
+++ b/internal/derrors/derrors.go
@@ -0,0 +1,89 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package derrors defines internal error values to categorize the different
+// types error semantics.
+package derrors
+
+import (
+ "errors"
+ "fmt"
+ "runtime"
+
+ "cloud.google.com/go/errorreporting"
+)
+
+// Wrap adds context to the error and allows
+// unwrapping the result to recover the original error.
+//
+// Example:
+//
+// defer derrors.Wrap(&err, "copy(%s, %s)", dst, src)
+// defer derrors.Wrap(&err, "copy(%s, %s)", src, dst)
+//
+// See Add for an equivalent function that does not allow
+// the result to be unwrapped.
+func Wrap(errp *error, format string, args ...interface{}) {
+ if *errp != nil {
+ *errp = fmt.Errorf("%s: %w", fmt.Sprintf(format, args...), *errp)
+ }
+}
+
+// WrapStack is like Wrap, but adds a stack trace if there isn't one already.
+func WrapStack(errp *error, format string, args ...interface{}) {
+ if *errp != nil {
+ if se := (*StackError)(nil); !errors.As(*errp, &se) {
+ *errp = NewStackError(*errp)
+ }
+ Wrap(errp, format, args...)
+ }
+}
+
+// StackError wraps an error and adds a stack trace.
+type StackError struct {
+ Stack []byte
+ err error
+}
+
+// NewStackError returns a StackError, capturing a stack trace.
+func NewStackError(err error) *StackError {
+ // Limit the stack trace to 16K. Same value used in the errorreporting client,
+ // cloud.google.com/go@v0.66.0/errorreporting/errors.go.
+ var buf [16 * 1024]byte
+ n := runtime.Stack(buf[:], false)
+ return &StackError{
+ err: err,
+ Stack: buf[:n],
+ }
+}
+
+func (e *StackError) Error() string {
+ return e.err.Error() // ignore the stack
+}
+
+func (e *StackError) Unwrap() error {
+ return e.err
+}
+
+// WrapAndReport calls Wrap followed by Report.
+func WrapAndReport(errp *error, format string, args ...interface{}) {
+ Wrap(errp, format, args...)
+ if *errp != nil {
+ Report(*errp)
+ }
+}
+
+var repClient *errorreporting.Client
+
+// SetReportingClient sets an errorreporting client, for use by Report.
+func SetReportingClient(c *errorreporting.Client) {
+ repClient = c
+}
+
+// Report uses the errorreporting API to report an error.
+func Report(err error) {
+ if repClient != nil {
+ repClient.Report(errorreporting.Entry{Error: err})
+ }
+}
