66 lines
2 KiB
Go
66 lines
2 KiB
Go
// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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package docker
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import (
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"net/http"
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"os"
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"github.com/elastic/beats/libbeat/logp"
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"github.com/docker/docker/api"
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"github.com/docker/docker/api/types/versions"
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"github.com/docker/docker/client"
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"golang.org/x/net/context"
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)
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// NewClient builds and returns a new Docker client
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// It uses version 1.30 by default, and negotiates it with the server so it is downgraded if 1.30 is too high
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func NewClient(host string, httpClient *http.Client, httpHeaders map[string]string) (*client.Client, error) {
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version := os.Getenv("DOCKER_API_VERSION")
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if version == "" {
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version = api.DefaultVersion
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}
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c, err := client.NewClient(host, version, httpClient, nil)
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if err != nil {
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return c, err
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}
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if os.Getenv("DOCKER_API_VERSION") == "" {
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logp.Debug("docker", "Negotiating client version")
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ping, err := c.Ping(context.Background())
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if err != nil {
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logp.Debug("docker", "Failed to perform ping: %s", err)
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}
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// try a really old version, before versioning headers existed
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if ping.APIVersion == "" {
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ping.APIVersion = "1.22"
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}
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// if server version is lower than the client version, downgrade
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if versions.LessThan(ping.APIVersion, version) {
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c.UpdateClientVersion(ping.APIVersion)
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}
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}
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logp.Debug("docker", "Client version set to %s", c.ClientVersion())
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return c, nil
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}
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