From 76fce15e32ec53c3894abf91aa92779682c9f5aa Mon Sep 17 00:00:00 2001
From: jdl <jdl@private.local>
Date: Sat, 13 Jun 2026 14:46:55 +0200
Subject: [PATCH] WIP

---
 hub/errs/db.go    | 33 +++++++++++++++++++++++++++
 hub/errs/types.go | 57 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 90 insertions(+)
 create mode 100644 hub/errs/db.go
 create mode 100644 hub/errs/types.go

diff --git a/hub/errs/db.go b/hub/errs/db.go
new file mode 100644
index 0000000..85e4b61
--- /dev/null
+++ b/hub/errs/db.go
@@ -0,0 +1,33 @@
+package errs
+
+import (
+	"database/sql"
+	"errors"
+	"log"
+
+	sqlite3 "github.com/mattn/go-sqlite3"
+)
+
+func DB(err error) error {
+	if err == nil {
+		return nil
+	}
+
+	if _, ok := err.(*Error); ok {
+		return err
+	}
+
+	if err == sql.ErrNoRows {
+		return ErrNotFound
+	}
+
+	var se sqlite3.Error
+	if errors.As(err, &se) {
+		switch se.ExtendedCode {
+		case sqlite3.ErrConstraintUnique, sqlite3.ErrConstraintPrimaryKey:
+			return ErrAlreadyExists
+		}
+	}
+	log.Printf("Unexpected error: %v", err)
+	return ErrUnexpected
+}
diff --git a/hub/errs/types.go b/hub/errs/types.go
new file mode 100644
index 0000000..fbd9cf7
--- /dev/null
+++ b/hub/errs/types.go
@@ -0,0 +1,57 @@
+package errs
+
+import (
+	"fmt"
+	"net/http"
+)
+
+type Error struct {
+	Code int
+	Msg  string
+}
+
+func (e *Error) Error() string {
+	return fmt.Sprintf("[%d] %s", e.Code, e.Msg)
+}
+
+var (
+	ErrUnexpected    = Internal.WithMsg("Unexpected internal error.")
+	ErrNotFound      = NotFound.WithMsg("Not found.")
+	ErrAlreadyExists = Conflict.WithMsg("AlreadyExists.")
+
+	// Validation errors.
+	ErrInvalidIP       = BadRequest.WithMsg("Invalid IP.")
+	ErrInvalidPeerIP   = BadRequest.WithMsg("Invalid peer IP.")
+	ErrNonPrivateIP    = BadRequest.WithMsg("Non-private IP.")
+	ErrInvalidPort     = BadRequest.WithMsg("Invalid port.")
+	ErrInvalidNetName  = BadRequest.WithMsg("Invalid network name.")
+	ErrNetNameNotLocal = BadRequest.WithMsg("Network name must end with .local.")
+	ErrInvalidPeerName = BadRequest.WithMsg("Invalid peer name.")
+)
+
+// ----------------------------------------------------------------------------
+
+type Type struct {
+	Code int
+	Msg  string
+}
+
+func (t Type) WithErr(err error) *Error {
+	return &Error{Code: t.Code, Msg: err.Error()}
+}
+
+func (t Type) WithMsg(msg string) *Error {
+	return &Error{Code: t.Code, Msg: msg}
+}
+
+func (t Type) WithMsgf(msg string, args ...any) *Error {
+	return &Error{Code: t.Code, Msg: fmt.Sprintf(msg, args...)}
+}
+
+var (
+	Internal      = Type{Code: http.StatusInternalServerError}
+	NotAuthorized = Type{Code: http.StatusUnauthorized}
+	NotFound      = Type{Code: http.StatusNotFound}
+	BadRequest    = Type{Code: http.StatusBadRequest}
+	Conflict      = Type{Code: http.StatusConflict}
+)