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remote_config.go
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remote_config.go
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// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package config
import (
"github.com/m3db/m3/src/query/storage"
)
// Remote is an option for remote storage.
type Remote struct {
// ErrorBehavior describes what this remote client should do on error.
ErrorBehavior storage.ErrorBehavior
// Name is the name for this remote client.
Name string
// Addresses are the remote addresses for this client.
Addresses []string
}
func makeRemote(
name string,
addresses []string,
global storage.ErrorBehavior,
override *storage.ErrorBehavior,
) Remote {
if override != nil {
global = *override
}
return Remote{Name: name, Addresses: addresses, ErrorBehavior: global}
}
// RemoteOptions are the options for RPC configurations.
type RemoteOptions interface {
// ServeEnabled describes if this RPC should serve rpc requests.
ServeEnabled() bool
// ServeAddress describes the address this RPC server will listening on.
ServeAddress() string
// ListenEnabled describes if this RPC should connect to remote clients.
ListenEnabled() bool
// ReflectionEnabled describes if this RPC server should have reflection
// enabled.
ReflectionEnabled() bool
// Remotes is a list of remote clients.
Remotes() []Remote
}
type remoteOptions struct {
enabled bool
reflectionEnabled bool
address string
remotes []Remote
}
// RemoteOptionsFromConfig builds remote options given a set of configs.
func RemoteOptionsFromConfig(cfg *RPCConfiguration) RemoteOptions {
if cfg == nil {
return &remoteOptions{}
}
// NB: Remote storage enabled should be determined by which options are
// present unless enabled is explicitly set to false.
enabled := true
if cfg.Enabled != nil {
enabled = *cfg.Enabled
}
// NB: Remote storages warn on failure by default.
defaultBehavior := storage.BehaviorWarn
if cfg.ErrorBehavior != nil {
defaultBehavior = *cfg.ErrorBehavior
}
remotes := make([]Remote, 0, len(cfg.Remotes)+1)
if len(cfg.RemoteListenAddresses) > 0 {
remotes = append(remotes, makeRemote("default", cfg.RemoteListenAddresses,
defaultBehavior, nil))
}
for _, remote := range cfg.Remotes {
remotes = append(remotes, makeRemote(remote.Name,
remote.RemoteListenAddresses, defaultBehavior, remote.ErrorBehavior))
}
return &remoteOptions{
enabled: enabled,
reflectionEnabled: cfg.ReflectionEnabled,
address: cfg.ListenAddress,
remotes: remotes,
}
}
func (o *remoteOptions) ServeEnabled() bool {
return o.enabled && len(o.address) > 0
}
func (o *remoteOptions) ServeAddress() string {
return o.address
}
func (o *remoteOptions) ListenEnabled() bool {
return o.enabled && len(o.remotes) > 0
}
func (o *remoteOptions) ReflectionEnabled() bool {
return o.enabled && o.reflectionEnabled
}
func (o *remoteOptions) Remotes() []Remote {
return o.remotes
}