feat(errconnect): add connect-go error code mapping

errconnect/code.go

@@ -0,0 +1,52 @@
+// Package errconnect adapts trogonerror to connectrpc.com/connect, translating
+// error codes so trogonerror-based services can serve Connect RPC handlers.
+package errconnect
+
+import (
+	"connectrpc.com/connect"
+
+	"github.com/TrogonStack/trogonerror"
+)
+
+// Code maps the two vocabularies. Both are the canonical gRPC set and the
+// numbers line up today, but a conversion written as a cast is a silent
+// mistranslation the day either side adds a code, and an unknown code has to
+// fail towards Internal rather than towards whatever it collides with.
+func Code(c trogonerror.Code) connect.Code {
+	switch c {
+	case trogonerror.CodeCancelled:
+		return connect.CodeCanceled
+	case trogonerror.CodeUnknown:
+		return connect.CodeUnknown
+	case trogonerror.CodeInvalidArgument:
+		return connect.CodeInvalidArgument
+	case trogonerror.CodeDeadlineExceeded:
+		return connect.CodeDeadlineExceeded
+	case trogonerror.CodeNotFound:
+		return connect.CodeNotFound
+	case trogonerror.CodeAlreadyExists:
+		return connect.CodeAlreadyExists
+	case trogonerror.CodePermissionDenied:
+		return connect.CodePermissionDenied
+	case trogonerror.CodeResourceExhausted:
+		return connect.CodeResourceExhausted
+	case trogonerror.CodeFailedPrecondition:
+		return connect.CodeFailedPrecondition
+	case trogonerror.CodeAborted:
+		return connect.CodeAborted
+	case trogonerror.CodeOutOfRange:
+		return connect.CodeOutOfRange
+	case trogonerror.CodeUnimplemented:
+		return connect.CodeUnimplemented
+	case trogonerror.CodeInternal:
+		return connect.CodeInternal
+	case trogonerror.CodeUnavailable:
+		return connect.CodeUnavailable
+	case trogonerror.CodeDataLoss:
+		return connect.CodeDataLoss
+	case trogonerror.CodeUnauthenticated:
+		return connect.CodeUnauthenticated
+	default:
+		return connect.CodeInternal
+	}
+}

errconnect/code_test.go

@@ -0,0 +1,47 @@
+package errconnect_test
+
+import (
+	"testing"
+
+	"connectrpc.com/connect"
+	"github.com/stretchr/testify/assert"
+
+	"github.com/TrogonStack/trogonerror"
+	"github.com/TrogonStack/trogonerror/errconnect"
+)
+
+func TestCode(t *testing.T) {
+	tests := []struct {
+		name string
+		code trogonerror.Code
+		want connect.Code
+	}{
+		{"CANCELLED", trogonerror.CodeCancelled, connect.CodeCanceled},
+		{"UNKNOWN", trogonerror.CodeUnknown, connect.CodeUnknown},
+		{"INVALID_ARGUMENT", trogonerror.CodeInvalidArgument, connect.CodeInvalidArgument},
+		{"DEADLINE_EXCEEDED", trogonerror.CodeDeadlineExceeded, connect.CodeDeadlineExceeded},
+		{"NOT_FOUND", trogonerror.CodeNotFound, connect.CodeNotFound},
+		{"ALREADY_EXISTS", trogonerror.CodeAlreadyExists, connect.CodeAlreadyExists},
+		{"PERMISSION_DENIED", trogonerror.CodePermissionDenied, connect.CodePermissionDenied},
+		{"RESOURCE_EXHAUSTED", trogonerror.CodeResourceExhausted, connect.CodeResourceExhausted},
+		{"FAILED_PRECONDITION", trogonerror.CodeFailedPrecondition, connect.CodeFailedPrecondition},
+		{"ABORTED", trogonerror.CodeAborted, connect.CodeAborted},
+		{"OUT_OF_RANGE", trogonerror.CodeOutOfRange, connect.CodeOutOfRange},
+		{"UNIMPLEMENTED", trogonerror.CodeUnimplemented, connect.CodeUnimplemented},
+		{"INTERNAL", trogonerror.CodeInternal, connect.CodeInternal},
+		{"UNAVAILABLE", trogonerror.CodeUnavailable, connect.CodeUnavailable},
+		{"DATA_LOSS", trogonerror.CodeDataLoss, connect.CodeDataLoss},
+		{"UNAUTHENTICATED", trogonerror.CodeUnauthenticated, connect.CodeUnauthenticated},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equal(t, tt.want, errconnect.Code(tt.code))
+		})
+	}
+
+	t.Run("unknown code falls back to Internal", func(t *testing.T) {
+		var unknownCode trogonerror.Code = 999
+		assert.Equal(t, connect.CodeInternal, errconnect.Code(unknownCode))
+	})
+}

go.mod

@@ -2,10 +2,14 @@ module github.com/TrogonStack/trogonerror
 
 go 1.24.2
 
-require github.com/stretchr/testify v1.11.1
+require (
+	connectrpc.com/connect v1.19.2
+	github.com/stretchr/testify v1.11.1
+)
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,9 +1,15 @@
+connectrpc.com/connect v1.19.2 h1:McQ83FGdzL+t60peksi0gXC7MQ/iLKgLduAnThbM0mo=
+connectrpc.com/connect v1.19.2/go.mod h1:tN20fjdGlewnSFeZxLKb0xwIZ6ozc3OQs2hTXy4du9w=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
+github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=