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client.go
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client.go
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// Copyright (c) 2016 Tigera, Inc. All rights reserved.
// 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
//
// http://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 clientmgr
import (
"fmt"
"os"
log "github.com/sirupsen/logrus"
"github.com/projectcalico/calicoctl/v3/calicoctl/commands/constants"
"github.com/projectcalico/libcalico-go/lib/apiconfig"
client "github.com/projectcalico/libcalico-go/lib/clientv3"
)
// NewClient creates a new CalicoClient using connection information in the specified
// filename (if it exists), dropping back to environment variables for any
// parameter not loaded from file.
func NewClient(cf string) (client.Interface, error) {
cfg, err := LoadClientConfig(cf)
if err != nil {
log.Info("Error loading config")
return nil, err
}
log.Infof("Loaded client config: %#v", cfg.Spec)
return NewClientFromConfig(cfg)
}
func NewClientFromConfig(cfg *apiconfig.CalicoAPIConfig) (client.Interface, error) {
c, err := client.New(*cfg)
if err != nil {
return nil, err
}
return c, err
}
// LoadClientConfig loads the client config from file if the file exists,
// otherwise will load from environment variables.
func LoadClientConfig(cf string) (*apiconfig.CalicoAPIConfig, error) {
if _, err := os.Stat(cf); err != nil {
if cf != constants.DefaultConfigPath {
fmt.Printf("Error reading config file: %s\n", cf)
os.Exit(1)
}
log.Infof("Config file: %s cannot be read - reading config from environment", cf)
cf = ""
}
return apiconfig.LoadClientConfig(cf)
}