mirror of https://github.com/helm/helm
Brendan Melville
9 years ago
commit
273e519a87
@ -0,0 +1,93 @@
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/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may 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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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package registry
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import (
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"github.com/google/go-github/github"
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"fmt"
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"log"
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)
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// GithubRegistry implements the Registry interface that talks to github.
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type GithubRegistry struct {
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owner string
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repository string
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client *github.Client
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}
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// NewGithubRegistry creates a Registry that can be used to talk to github.
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func NewGithubRegistry(owner string, repository string) *GithubRegistry {
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return &GithubRegistry{
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owner: owner,
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repository: repository,
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client: github.NewClient(nil),
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}
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}
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// List the types from the Registry.
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func (g *GithubRegistry) List() ([]Type, error) {
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// First list all the types at the top level.
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types, err := g.getDirs(TypesDir)
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if err != nil {
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log.Printf("Failed to list types : %v", err)
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return nil, err
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}
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var retTypes []Type
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for _, t := range types {
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// Then we need to fetch the versions (directories for this type)
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versions, err := g.getDirs(TypesDir + "/" + t)
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if err != nil {
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log.Printf("Failed to fetch versions for type: %s", t)
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return nil, err
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}
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for _, v := range versions {
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retTypes = append(retTypes, Type{Name: t, Version: v})
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}
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}
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return retTypes, nil
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}
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// GetURL fetches the download URL for a given Type.
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func (g *GithubRegistry) GetURL(t Type) (string, error) {
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_, dc, _, err := g.client.Repositories.GetContents(g.owner, g.repository, TypesDir+"/"+t.Name+"/"+t.Version, nil)
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if err != nil {
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log.Printf("Failed to list types : %v", err)
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return "", err
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}
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for _, f := range dc {
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if *f.Type == "file" {
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if *f.Name == t.Name+".jinja" || *f.Name == t.Name+".py" {
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return *f.DownloadURL, nil
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}
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}
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}
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return "", fmt.Errorf("Can not find type %s:%s", t.Name, t.Version)
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}
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func (g *GithubRegistry) getDirs(dir string) ([]string, error) {
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_, dc, _, err := g.client.Repositories.GetContents(g.owner, g.repository, dir, nil)
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if err != nil {
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log.Printf("Failed to call ListRefs : %v", err)
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return nil, err
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}
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var dirs []string
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for _, entry := range dc {
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if *entry.Type == "dir" {
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dirs = append(dirs, *entry.Name)
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}
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}
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return dirs, nil
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}
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@ -0,0 +1,45 @@
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/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may 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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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package registry
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// Registry abstracts a types registry which holds types that can be
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// used in a Deployment Manager configurations. A registry root must have
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// a 'types' directory which contains all the available types. Each type
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// then contains version directories which in turn contains all the files
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// necessary for that version of the type.
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// For example a type registry holding two types:
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// redis v1 (implemented in jinja)
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// replicatedservice v2 (implemented in python)
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// would have a directory structure like so:
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// /types/redis/v1
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// redis.jinja
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// redis.jinja.schema
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// /types/replicatedservice/v2
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// replicatedservice.python
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// replicatedservice.python.schema
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const TypesDir string = "types"
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type Type struct {
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Name string
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Version string
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}
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// Registry abstracts type interactions.
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type Registry interface {
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// List all the types in the given registry
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List() ([]Type, error)
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// Get the download URL for a given type and version
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GetURL(t Type) (string, error)
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}
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@ -0,0 +1,32 @@
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{% set REDIS_PORT = 6379 %}
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{% set WORKERS = properties['workers'] or 2 %}
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resources:
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- name: redis-master
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type: https://raw.githubusercontent.com/kubernetes/deployment-manager/master/examples/replicatedservice/replicatedservice.py
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properties:
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# This has to be overwritten since service names are hard coded in the code
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service_name: redis-master
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service_port: {{ REDIS_PORT }}
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target_port: {{ REDIS_PORT }}
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container_port: {{ REDIS_PORT }}
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replicas: 1
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container_name: master
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image: redis
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- name: redis-slave
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type: https://raw.githubusercontent.com/kubernetes/deployment-manager/master/examples/replicatedservice/replicatedservice.py
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properties:
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# This has to be overwritten since service names are hard coded in the code
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service_name: redis-slave
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service_port: {{ REDIS_PORT }}
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container_port: {{ REDIS_PORT }}
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replicas: {{ WORKERS }}
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container_name: worker
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image: kubernetes/redis-slave:v2
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# An example of how to specify env variables.
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env:
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- name: GET_HOSTS_FROM
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value: env
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- name: REDIS_MASTER_SERVICE_HOST
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value: redis-master
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@ -0,0 +1,10 @@
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info:
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title: Redis cluster
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description: Defines a redis cluster, using a single replica
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replicatedservice for master and replicatedservice for workers.
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properties:
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workers:
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type: int
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default: 2
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description: Number of worker replicas.
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@ -0,0 +1,169 @@
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"""Defines a ReplicatedService type by creating both a Service and an RC.
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This module creates a typical abstraction for running a service in a
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Kubernetes cluster, namely a replication controller and a service packaged
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together into a single unit.
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"""
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import yaml
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SERVICE_TYPE_COLLECTION = 'Service'
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RC_TYPE_COLLECTION = 'ReplicationController'
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def GenerateConfig(context):
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"""Generates a Replication Controller and a matching Service.
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Args:
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context: Template context. See schema for context properties.
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Returns:
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A Container Manifest as a YAML string.
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"""
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# YAML config that we're going to create for both RC & Service
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config = {'resources': []}
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name = context.env['name']
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container_name = context.properties.get('container_name', name)
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namespace = context.properties.get('namespace', 'default')
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# Define things that the Service cares about
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service_name = context.properties.get('service_name', name + '-service')
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service_type = SERVICE_TYPE_COLLECTION
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# Define things that the Replication Controller (rc) cares about
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rc_name = name + '-rc'
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rc_type = RC_TYPE_COLLECTION
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service = {
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'name': service_name,
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'type': service_type,
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'properties': {
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'apiVersion': 'v1',
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'kind': 'Service',
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'namespace': namespace,
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'metadata': {
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'name': service_name,
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'labels': GenerateLabels(context, service_name),
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},
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'spec': {
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'ports': [GenerateServicePorts(context, container_name)],
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'selector': GenerateLabels(context, name)
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}
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}
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}
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set_up_external_lb = context.properties.get('external_service', None)
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if set_up_external_lb:
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service['properties']['spec']['type'] = 'LoadBalancer'
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config['resources'].append(service)
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rc = {
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'name': rc_name,
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'type': rc_type,
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'properties': {
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'apiVersion': 'v1',
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'kind': 'ReplicationController',
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'namespace': namespace,
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'metadata': {
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'name': rc_name,
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'labels': GenerateLabels(context, rc_name),
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},
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'spec': {
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'replicas': context.properties['replicas'],
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'selector': GenerateLabels(context, name),
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'template': {
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'metadata': {
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'labels': GenerateLabels(context, name),
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},
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'spec': {
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'containers': [
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{
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'env': GenerateEnv(context),
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'name': container_name,
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'image': context.properties['image'],
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'ports': [
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{
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'name': container_name,
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'containerPort': context.properties['container_port'],
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}
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]
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}
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]
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}
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}
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}
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}
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}
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config['resources'].append(rc)
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return yaml.dump(config)
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# Generates labels either from the context.properties['labels'] or generates
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# a default label 'name':name
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def GenerateLabels(context, name):
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"""Generates labels from context.properties['labels'] or creates default.
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We make a deep copy of the context.properties['labels'] section to avoid
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linking in the yaml document, which I believe reduces readability of the
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expanded template. If no labels are given, generate a default 'name':name.
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Args:
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context: Template context, which can contain the following properties:
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labels - Labels to generate
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Returns:
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A dict containing labels in a name:value format
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"""
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tmp_labels = context.properties.get('labels', None)
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ret_labels = {'name': name}
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if isinstance(tmp_labels, dict):
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for key, value in tmp_labels.iteritems():
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ret_labels[key] = value
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return ret_labels
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def GenerateServicePorts(context, name):
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"""Generates a ports section for a service.
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Args:
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context: Template context, which can contain the following properties:
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service_port - Port to use for the service
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target_port - Target port for the service
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protocol - Protocol to use.
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Returns:
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A dict containing a port definition
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"""
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service_port = context.properties.get('service_port', None)
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target_port = context.properties.get('target_port', None)
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protocol = context.properties.get('protocol')
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ports = {}
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if name:
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ports['name'] = name
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if service_port:
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ports['port'] = service_port
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if target_port:
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ports['targetPort'] = target_port
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if protocol:
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ports['protocol'] = protocol
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return ports
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def GenerateEnv(context):
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"""Generates environmental variables for a pod.
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Args:
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context: Template context, which can contain the following properties:
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env - Environment variables to set.
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Returns:
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A list containing env variables in dict format {name: 'name', value: 'value'}
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"""
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env = []
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tmp_env = context.properties.get('env', [])
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for entry in tmp_env:
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if isinstance(entry, dict):
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env.append({'name': entry.get('name'), 'value': entry.get('value')})
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return env
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@ -0,0 +1,57 @@
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info:
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title: Replicated Service
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description: |
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Defines a ReplicatedService type by creating both a Service and an RC.
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This module creates a typical abstraction for running a service in a
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Kubernetes cluster, namely a replication controller and a service packaged
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together into a single unit.
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required:
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- image
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properties:
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container_name:
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type: string
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description: Name to use for container. If omitted, name is used.
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service_name:
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type: string
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description: Name to use for service. If omitted, name-service is used.
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namespace:
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type: string
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description: Namespace to create resources in. If omitted, 'default' is
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used.
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default: default
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protocol:
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type: string
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description: Protocol to use for the service.
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service_port:
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type: int
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description: Port to use for the service.
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target_port:
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type: int
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description: Target port to use for the service.
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container_port:
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type: int
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description: Port to use for the container.
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replicas:
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type: int
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description: Number of replicas to create in RC.
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image:
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type: string
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description: Docker image to use for replicas.
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labels:
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type: object
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description: Labels to apply.
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env:
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type: object
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description: Environment variables to apply.
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properties:
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name:
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type: string
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value:
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type: string
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external_service:
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type: boolean
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description: If set to true, enable external load balancer.
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