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check.go
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check.go
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// Copyright (C) 2021 Alexander Sowitzki
//
// This program is free software: you can redistribute it and/or modify it under the terms of the
// GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License along with this program.
// If not, see <https://www.gnu.org/licenses/>.
package internal
import (
"context"
"fmt"
"dev.eqrx.net/healthcheck/internal/ping"
)
type (
// resolverFn shall resolves a predefined service and returns its DNS name and a address string that can be used
// for net.Dial. If err is nil, the other return values may not be nil.
resolverFn func(context.Context, string) (string, string, error)
// connectorFn shall connect to a service behind a DNS name and an address.
// It shall return an error is the connection is not successful.
connectorFn func(context.Context, string, string) error
)
// checkConn resolves an address using the resolverFn resolver, calls connectorFn connection with the domain and
// result and IP if it succeeded and pings healthchecks.io with key if that succeeds too. After succeeding
// with that it returns with nil as error. If there is a failure at any point, it returns with an error.
func checkConn(ctx context.Context, key string, target string, resolver resolverFn, connector connectorFn) error {
_, addr, err := resolver(ctx, target)
if err != nil {
return fmt.Errorf("resolve: %w", err)
}
if err = connector(ctx, target, addr); err != nil {
return fmt.Errorf("connect: %w", err)
}
if err := ping.Send(ctx, key); err != nil {
return fmt.Errorf("ping: %w", err)
}
return nil
}
// checkChecker calls the function checker. If it returns nil as error it pings healthchecks.io with key and return nil.
// If there is a failure at any point, it returns with an error.
func checkChecker(ctx context.Context, key string, checker func(context.Context) error) error {
if err := checker(ctx); err != nil {
return fmt.Errorf("check: %w", err)
}
if err := ping.Send(ctx, key); err != nil {
return fmt.Errorf("ping: %w", err)
}
return nil
}