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feat: smarter fly presets for clusters
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| // Utilities to interact with Fly.io platform | ||
| package fly | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "net" | ||
| "time" | ||
| ) | ||
|
|
||
| type VMInfo struct { | ||
| ID string | ||
| Region string | ||
| } | ||
|
|
||
| // ClusterInfo contains information about the Fly.io cluster | ||
| // obtained from the DNS records, such as the number of machines and regions | ||
| type ClusterInfo struct { | ||
| regions []string | ||
| vms []*VMInfo | ||
| } | ||
|
|
||
| func (c *ClusterInfo) NumRegions() int { | ||
| return len(c.regions) | ||
| } | ||
|
|
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| func (c *ClusterInfo) Regions() []string { | ||
| return c.regions | ||
| } | ||
|
|
||
| func (c *ClusterInfo) VMs() []string { | ||
| ids := make([]string, len(c.vms)) | ||
| for i, vm := range c.vms { | ||
| ids[i] = vm.ID | ||
| } | ||
| return ids | ||
| } | ||
|
|
||
| func (c *ClusterInfo) NumVMs() int { | ||
| return len(c.vms) | ||
| } | ||
|
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| func Cluster(appName string) (*ClusterInfo, error) { | ||
| addr := fmt.Sprintf("vms.%s.internal.", appName) | ||
|
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| ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second) | ||
| defer cancel() | ||
|
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||
| textRecords, err := net.DefaultResolver.LookupTXT(ctx, addr) | ||
|
|
||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| vms := make([]*VMInfo, len(textRecords)) | ||
| regionsMap := make(map[string]struct{}) | ||
| regions := make([]string, 0) | ||
|
|
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| for i, txt := range textRecords { | ||
| vm := &VMInfo{} | ||
| fmt.Sscanf(txt, "%s %s", &vm.ID, &vm.Region) | ||
| vms[i] = vm | ||
|
|
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| if _, ok := regionsMap[vm.Region]; !ok { | ||
| regionsMap[vm.Region] = struct{}{} | ||
| regions = append(regions, vm.Region) | ||
| } | ||
| } | ||
|
|
||
| return &ClusterInfo{regions: regions, vms: vms}, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| package fly | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
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| "github.com/anycable/anycable-go/mocks" | ||
| "github.com/stretchr/testify/assert" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func TestCluster_multiple_nodes_and_regions(t *testing.T) { | ||
| teardownDNS := mocks.MockDNSServer("vms.my-fly-app.internal.", []string{"xyz ewr", "abc sea", "def ewr"}) | ||
| defer teardownDNS() | ||
|
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| cluster, err := Cluster("my-fly-app") | ||
|
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| require.NoError(t, err) | ||
|
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| assert.Equal(t, 2, cluster.NumRegions()) | ||
| assert.Equal(t, 3, cluster.NumVMs()) | ||
| assert.EqualValues(t, []string{"ewr", "sea"}, cluster.Regions()) | ||
| assert.EqualValues(t, []string{"xyz", "abc", "def"}, cluster.VMs()) | ||
| } | ||
|
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| func TestCluster_when_dns_error(t *testing.T) { | ||
| cluster, err := Cluster("my-fly-app") | ||
|
|
||
| require.Error(t, err) | ||
| assert.Nil(t, cluster) | ||
| } |
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