77 lines
2.1 KiB
Go
77 lines
2.1 KiB
Go
package apiconfig
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"github.com/kelseyhightower/envconfig"
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yaml "github.com/projectcalico/go-yaml-wrapper"
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apiv3 "github.com/projectcalico/libcalico-go/lib/apis/v3"
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log "github.com/sirupsen/logrus"
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)
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// LoadClientConfig loads the ClientConfig from the specified file (if specified)
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// or from environment variables (if the file is not specified).
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func LoadClientConfig(filename string) (*CalicoAPIConfig, error) {
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// Override / merge with values loaded from the specified file.
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if filename != "" {
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b, err := ioutil.ReadFile(filename)
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if err != nil {
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return nil, err
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}
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c, err := LoadClientConfigFromBytes(b)
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if err != nil {
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return nil, fmt.Errorf("syntax error in %s: %v", filename, err)
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}
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return c, nil
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}
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return LoadClientConfigFromEnvironment()
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}
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// LoadClientConfig loads the ClientConfig from the supplied bytes containing
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// YAML or JSON format data.
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func LoadClientConfigFromBytes(b []byte) (*CalicoAPIConfig, error) {
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var c CalicoAPIConfig
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// Default the backend type to be etcd v3. This will be overridden if
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// explicitly specified in the file.
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log.Debug("Loading config from JSON or YAML data")
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c = CalicoAPIConfig{
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Spec: CalicoAPIConfigSpec{
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DatastoreType: EtcdV3,
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},
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}
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if err := yaml.UnmarshalStrict(b, &c); err != nil {
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return nil, err
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}
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// Validate the version and kind.
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if c.APIVersion != apiv3.GroupVersionCurrent {
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return nil, errors.New("invalid config file: unknown APIVersion '" + c.APIVersion + "'")
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}
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if c.Kind != KindCalicoAPIConfig {
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return nil, errors.New("invalid config file: expected kind '" + KindCalicoAPIConfig + "', got '" + c.Kind + "'")
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}
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log.Debug("Datastore type: ", c.Spec.DatastoreType)
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return &c, nil
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}
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// LoadClientConfig loads the ClientConfig from the specified file (if specified)
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// or from environment variables (if the file is not specified).
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func LoadClientConfigFromEnvironment() (*CalicoAPIConfig, error) {
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c := NewCalicoAPIConfig()
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// Load client config from environment variables.
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log.Debug("Loading config from environment")
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if err := envconfig.Process("calico", &c.Spec); err != nil {
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return nil, err
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}
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return c, nil
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}
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