feat: implement runtime configuration package with multi-org support (#14624)

runtime configuration package
---------

Signed-off-by: Danny Kopping <danny@coder.com>
Co-authored-by: Danny Kopping <danny@coder.com>

coderd/runtimeconfig/resolver.go

@@ -0,0 +1,92 @@
+package runtimeconfig
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"fmt"
+
+	"github.com/google/uuid"
+	"golang.org/x/xerrors"
+
+	"github.com/coder/coder/v2/coderd/database"
+)
+
+// NoopResolver is a useful test device.
+type NoopResolver struct{}
+
+func NewNoopResolver() *NoopResolver {
+	return &NoopResolver{}
+}
+
+func (NoopResolver) GetRuntimeConfig(context.Context, string) (string, error) {
+	return "", ErrEntryNotFound
+}
+
+func (NoopResolver) UpsertRuntimeConfig(context.Context, string, string) error {
+	return ErrEntryNotFound
+}
+
+func (NoopResolver) DeleteRuntimeConfig(context.Context, string) error {
+	return ErrEntryNotFound
+}
+
+// StoreResolver uses the database as the underlying store for runtime settings.
+type StoreResolver struct {
+	db Store
+}
+
+func NewStoreResolver(db Store) *StoreResolver {
+	return &StoreResolver{db: db}
+}
+
+func (m StoreResolver) GetRuntimeConfig(ctx context.Context, key string) (string, error) {
+	val, err := m.db.GetRuntimeConfig(ctx, key)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return "", xerrors.Errorf("%q: %w", key, ErrEntryNotFound)
+		}
+		return "", xerrors.Errorf("fetch %q: %w", key, err)
+	}
+
+	return val, nil
+}
+
+func (m StoreResolver) UpsertRuntimeConfig(ctx context.Context, key, val string) error {
+	err := m.db.UpsertRuntimeConfig(ctx, database.UpsertRuntimeConfigParams{Key: key, Value: val})
+	if err != nil {
+		return xerrors.Errorf("update %q: %w", key, err)
+	}
+	return nil
+}
+
+func (m StoreResolver) DeleteRuntimeConfig(ctx context.Context, key string) error {
+	return m.db.DeleteRuntimeConfig(ctx, key)
+}
+
+// NamespacedResolver prefixes all keys with a namespace.
+// Then defers to the underlying resolver for the actual operations.
+type NamespacedResolver struct {
+	ns      string
+	wrapped Resolver
+}
+
+func OrganizationResolver(orgID uuid.UUID, wrapped Resolver) NamespacedResolver {
+	return NamespacedResolver{ns: orgID.String(), wrapped: wrapped}
+}
+
+func (m NamespacedResolver) GetRuntimeConfig(ctx context.Context, key string) (string, error) {
+	return m.wrapped.GetRuntimeConfig(ctx, m.namespacedKey(key))
+}
+
+func (m NamespacedResolver) UpsertRuntimeConfig(ctx context.Context, key, val string) error {
+	return m.wrapped.UpsertRuntimeConfig(ctx, m.namespacedKey(key), val)
+}
+
+func (m NamespacedResolver) DeleteRuntimeConfig(ctx context.Context, key string) error {
+	return m.wrapped.DeleteRuntimeConfig(ctx, m.namespacedKey(key))
+}
+
+func (m NamespacedResolver) namespacedKey(k string) string {
+	return fmt.Sprintf("%s:%s", m.ns, k)
+}