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Add load balancing support to services.
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@@ -15,3 +15,7 @@ | |
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| # Go test binaries | ||
| *.test | ||
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| # Mercurial files | ||
| **/.hg | ||
| **/.hg* | ||
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| @@ -0,0 +1,8 @@ | ||
| { | ||
| "id": "example", | ||
| "port": 8000, | ||
| "labels": { | ||
| "name": "nginx" | ||
| }, | ||
| "createExternalLoadBalancer": true | ||
| } |
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| @@ -1,5 +1,5 @@ | ||
| { | ||
| "id": "example2", | ||
| "id": "example", | ||
| "port": 8000, | ||
| "labels": { | ||
| "name": "nginx" | ||
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| /* | ||
| Copyright 2014 Google 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. | ||
| */ | ||
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| package cloudprovider | ||
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| // CloudInterface is an abstract, pluggable interface for cloud providers | ||
| type Interface interface { | ||
| // TCPLoadBalancer returns a balancer interface, or nil if none is supported. Returns an error if one occurs. | ||
| TCPLoadBalancer() (TCPLoadBalancer, error) | ||
| } | ||
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| type TCPLoadBalancer interface { | ||
| // TODO: Break this up into different interfaces (LB, etc) when we have more than one type of service | ||
| TCPLoadBalancerExists(name, region string) (bool, error) | ||
| CreateTCPLoadBalancer(name, region string, port int, hosts []string) error | ||
| UpdateTCPLoadBalancer(name, region string, hosts []string) error | ||
| DeleteTCPLoadBalancer(name, region string) error | ||
| } |
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| /* | ||
| Copyright 2014 Google 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. | ||
| */ | ||
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| // Package cloudprovider supplies interfaces and implementations for cloud service providers | ||
| package cloudprovider | ||
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| import () |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,164 @@ | ||
| /* | ||
| Copyright 2014 Google 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. | ||
| */ | ||
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| package cloudprovider | ||
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| import ( | ||
| "fmt" | ||
| "io/ioutil" | ||
| "net/http" | ||
| "strconv" | ||
| "strings" | ||
| "time" | ||
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| "code.google.com/p/goauth2/compute/serviceaccount" | ||
| compute "code.google.com/p/google-api-go-client/compute/v1" | ||
| ) | ||
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| type GCECloud struct { | ||
| service *compute.Service | ||
| projectID string | ||
| zone string | ||
| } | ||
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| func getProjectAndZone() (string, string, error) { | ||
| client := http.Client{} | ||
| url := "http://metadata/computeMetadata/v1/instance/zone" | ||
| req, err := http.NewRequest("GET", url, nil) | ||
| if err != nil { | ||
| return "", "", err | ||
| } | ||
| req.Header.Add("X-Google-Metadata-Request", "True") | ||
| res, err := client.Do(req) | ||
| if err != nil { | ||
| return "", "", err | ||
| } | ||
| defer res.Body.Close() | ||
| data, err := ioutil.ReadAll(res.Body) | ||
| if err != nil { | ||
| return "", "", err | ||
| } | ||
| parts := strings.Split(string(data), "/") | ||
| if len(parts) != 4 { | ||
| return "", "", fmt.Errorf("Unexpected response: %s", string(data)) | ||
| } | ||
| return parts[1], parts[3], nil | ||
| } | ||
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| func NewGCECloud() (*GCECloud, error) { | ||
| projectID, zone, err := getProjectAndZone() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| client, err := serviceaccount.NewClient(&serviceaccount.Options{}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| svc, err := compute.New(client) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &GCECloud{ | ||
| service: svc, | ||
| projectID: projectID, | ||
| zone: zone, | ||
| }, nil | ||
| } | ||
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| func (gce *GCECloud) TCPLoadBalancer() (TCPLoadBalancer, error) { | ||
| return gce, nil | ||
| } | ||
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| func makeHostLink(projectID, zone, host string) string { | ||
| ix := strings.Index(host, ".") | ||
| if ix != -1 { | ||
| host = host[:ix] | ||
| } | ||
| return fmt.Sprintf("https://www.googleapis.com/compute/v1/projects/%s/zones/%s/instances/%s", | ||
| projectID, zone, host) | ||
| } | ||
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| func (gce *GCECloud) makeTargetPool(name, region string, hosts []string) (string, error) { | ||
| var instances []string | ||
| for _, host := range hosts { | ||
| instances = append(instances, makeHostLink(gce.projectID, gce.zone, host)) | ||
| } | ||
| pool := &compute.TargetPool{ | ||
| Name: name, | ||
| Instances: instances, | ||
| } | ||
| _, err := gce.service.TargetPools.Insert(gce.projectID, region, pool).Do() | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| link := fmt.Sprintf("https://www.googleapis.com/compute/v1/projects/%s/regions/%s/targetPools/%s", gce.projectID, region, name) | ||
| return link, nil | ||
| } | ||
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| func (gce *GCECloud) waitForRegionOp(op *compute.Operation, region string) error { | ||
| pollOp := op | ||
| for pollOp.Status != "DONE" { | ||
| var err error | ||
| time.Sleep(time.Second * 10) | ||
| pollOp, err = gce.service.RegionOperations.Get(gce.projectID, region, op.Name).Do() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
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| func (gce *GCECloud) TCPLoadBalancerExists(name, region string) (bool, error) { | ||
| _, err := gce.service.ForwardingRules.Get(gce.projectID, region, name).Do() | ||
| return false, err | ||
| } | ||
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| func (gce *GCECloud) CreateTCPLoadBalancer(name, region string, port int, hosts []string) error { | ||
| pool, err := gce.makeTargetPool(name, region, hosts) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| req := &compute.ForwardingRule{ | ||
| Name: name, | ||
| IPProtocol: "TCP", | ||
| PortRange: strconv.Itoa(port), | ||
| Target: pool, | ||
| } | ||
| _, err = gce.service.ForwardingRules.Insert(gce.projectID, region, req).Do() | ||
| return err | ||
| } | ||
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| func (gce *GCECloud) UpdateTCPLoadBalancer(name, region string, hosts []string) error { | ||
| var refs []*compute.InstanceReference | ||
| for _, host := range hosts { | ||
| refs = append(refs, &compute.InstanceReference{host}) | ||
| } | ||
| req := &compute.TargetPoolsAddInstanceRequest{ | ||
| Instances: refs, | ||
| } | ||
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| _, err := gce.service.TargetPools.AddInstance(gce.projectID, region, name, req).Do() | ||
| return err | ||
| } | ||
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| func (gce *GCECloud) DeleteTCPLoadBalancer(name, region string) error { | ||
| _, err := gce.service.ForwardingRules.Delete(gce.projectID, region, name).Do() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| _, err = gce.service.TargetPools.Delete(gce.projectID, region, name).Do() | ||
| return err | ||
| } |
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