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client.go
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client.go
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// Copyright 2019 eBay Inc.
// Primary authors: Simon Fell, Diego Ongaro,
// Raymond Kroeker, and Sathish Kandasamy.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package viewclient
import (
"context"
"fmt"
"github.com/ebay/akutan/config"
"github.com/ebay/akutan/discovery"
"github.com/ebay/akutan/discovery/discoveryfactory"
"github.com/ebay/akutan/viewclient/viewreg"
)
// New constructs a Client that uses view instances from the given
// configuration.
func New(cfg *config.Akutan) (*Client, error) {
locator, err := discoveryfactory.NewLocator(context.TODO(), &cfg.ViewsLocator)
if err != nil {
return nil, fmt.Errorf("failed to create locator for view servers: %v", err)
}
return NewWithLocator(cfg, locator), nil
}
// NewWithLocator constructs a Client that finds view instances from the
// given Locator.
func NewWithLocator(cfg *config.Akutan, views discovery.Locator) *Client {
ctx, cancel := context.WithCancel(context.Background())
return &Client{
cfg: cfg,
closeRegistry: cancel,
Registry: viewreg.NewRegistry(ctx, views),
}
}
// Client is a compatibility layer around the newer viewreg.Registry. Client
// currently owns its Registry, but in the future we plan for the current users
// of Client to manage their own Registry.
//
// TODO: meh viewclient.Client
type Client struct {
cfg *config.Akutan
closeRegistry func()
Registry *viewreg.Registry
}
// Close shuts down the view registry, disconnecting from all the views. After
// this, the Client is no longer useful, as it will not initiate new
// connections. Close() is safe to call more than once.
func (c *Client) Close() {
c.closeRegistry()
}