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engine.go
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engine.go
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package engine
import (
"bytes"
"compress/gzip"
"encoding/base64"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"regexp"
"strconv"
"strings"
"text/template"
//log "github.com/sirupsen/logrus"
"github.com/Microsoft/oe-engine/pkg/api"
"github.com/ghodss/yaml"
)
var templateFiles = []string{baseFile, params, vmparams, vars, vmvars, resources, vmresources, outputs, vmoutputs, customdata, utilsScript, provisionScript, validationScript, reinstallDriverScript}
var keyvaultSecretPathRe *regexp.Regexp
func init() {
keyvaultSecretPathRe = regexp.MustCompile(`^(/subscriptions/\S+/resourceGroups/\S+/providers/Microsoft.KeyVault/vaults/\S+)/secrets/([^/\s]+)(/(\S+))?$`)
}
func generateIPList(count int, firstAddr string) []string {
ipaddr := net.ParseIP(firstAddr).To4()
if ipaddr == nil {
panic(fmt.Sprintf("IPAddr '%s' is an invalid IP address", firstAddr))
}
ret := make([]string, count)
for i := 0; i < count; i++ {
ret[i] = fmt.Sprintf("%d.%d.%d.%d", ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]+byte(i))
}
return ret
}
func addValue(m paramsMap, k string, v interface{}) {
m[k] = paramsMap{
"value": v,
}
}
// getStorageAccountType returns the support managed disk storage tier for a give VM size
func getStorageAccountType(sizeName string) (string, error) {
spl := strings.Split(sizeName, "_")
if len(spl) < 2 {
return "", fmt.Errorf("Invalid sizeName: %s", sizeName)
}
capability := spl[1]
if strings.Contains(strings.ToLower(capability), "s") {
return "Premium_LRS", nil
}
return "Standard_LRS", nil
}
func getLBRule(name string, port int) string {
return fmt.Sprintf(` {
"name": "LBRule%d",
"properties": {
"backendAddressPool": {
"id": "[concat(variables('%sLbID'), '/backendAddressPools/', variables('%sLbBackendPoolName'))]"
},
"backendPort": %d,
"enableFloatingIP": false,
"frontendIPConfiguration": {
"id": "[variables('%sLbIPConfigID')]"
},
"frontendPort": %d,
"idleTimeoutInMinutes": 5,
"loadDistribution": "Default",
"probe": {
"id": "[concat(variables('%sLbID'),'/probes/tcp%dProbe')]"
},
"protocol": "tcp"
}
}`, port, name, name, port, name, port, name, port)
}
func getLBRules(name string, ports []int) string {
var buf bytes.Buffer
for index, port := range ports {
if index > 0 {
buf.WriteString(",\n")
}
buf.WriteString(getLBRule(name, port))
}
return buf.String()
}
func getProbe(port int) string {
return fmt.Sprintf(` {
"name": "tcp%dProbe",
"properties": {
"intervalInSeconds": "5",
"numberOfProbes": "2",
"port": %d,
"protocol": "tcp"
}
}`, port, port)
}
func getProbes(ports []int) string {
var buf bytes.Buffer
for index, port := range ports {
if index > 0 {
buf.WriteString(",\n")
}
buf.WriteString(getProbe(port))
}
return buf.String()
}
func getSecurityRule(port int, portIndex int) string {
// BaseLBPriority specifies the base lb priority.
BaseLBPriority := 200
return fmt.Sprintf(` {
"name": "Allow_%d",
"properties": {
"access": "Allow",
"description": "Allow traffic from the Internet to port %d",
"destinationAddressPrefix": "*",
"destinationPortRange": "%d",
"direction": "Inbound",
"priority": %d,
"protocol": "*",
"sourceAddressPrefix": "Internet",
"sourcePortRange": "*"
}
}`, port, port, port, BaseLBPriority+portIndex)
}
func getDataDisks(a *api.VMProfile) string {
if !a.HasDisks() {
return ""
}
var buf bytes.Buffer
buf.WriteString("\"dataDisks\": [\n")
managedDataDisks := ` {
"diskSizeGB": "%d",
"lun": %d,
"caching": "ReadOnly",
"createOption": "Empty"
}`
for i, diskSize := range a.DiskSizesGB {
if i > 0 {
buf.WriteString(",\n")
}
buf.WriteString(fmt.Sprintf(managedDataDisks, diskSize, i))
}
buf.WriteString("\n ],")
return buf.String()
}
func getSecurityRules(ports []int) string {
var buf bytes.Buffer
for index, port := range ports {
if index > 0 {
buf.WriteString(",\n")
}
buf.WriteString(getSecurityRule(port, index))
}
return buf.String()
}
// getSingleLineForTemplate returns the file as a single line for embedding in an arm template
func (t *TemplateGenerator) getSingleLineForTemplate(textFilename string, cs *api.OpenEnclave, profile interface{}) (string, error) {
b, err := Asset(textFilename)
if err != nil {
return "", fmt.Errorf("yaml file %s does not exist", textFilename)
}
// use go templates to process the text filename
templ := template.New("customdata template").Funcs(t.getTemplateFuncMap(cs))
if _, err = templ.New(textFilename).Parse(string(b)); err != nil {
return "", fmt.Errorf("error parsing file %s: %v", textFilename, err)
}
var buffer bytes.Buffer
if err = templ.ExecuteTemplate(&buffer, textFilename, profile); err != nil {
return "", fmt.Errorf("error executing template for file %s: %v", textFilename, err)
}
expandedTemplate := buffer.String()
textStr := escapeSingleLine(string(expandedTemplate))
return textStr, nil
}
func escapeSingleLine(escapedStr string) string {
// template.JSEscapeString leaves undesirable chars that don't work with pretty print
escapedStr = strings.Replace(escapedStr, "\\", "\\\\", -1)
escapedStr = strings.Replace(escapedStr, "\r\n", "\\n", -1)
escapedStr = strings.Replace(escapedStr, "\n", "\\n", -1)
escapedStr = strings.Replace(escapedStr, "\"", "\\\"", -1)
return escapedStr
}
// getBase64CustomScript will return a base64 of the CSE
func getBase64CustomScript(csFilename string) string {
b, err := Asset(csFilename)
if err != nil {
// this should never happen and this is a bug
panic(fmt.Sprintf("BUG: %s", err.Error()))
}
// translate the parameters
csStr := string(b)
csStr = strings.Replace(csStr, "\r\n", "\n", -1)
return getBase64CustomScriptFromStr(csStr)
}
// getBase64CustomScript will return a base64 of the CSE
func getBase64CustomScriptFromStr(str string) string {
var gzipB bytes.Buffer
w := gzip.NewWriter(&gzipB)
w.Write([]byte(str))
w.Close()
return base64.StdEncoding.EncodeToString(gzipB.Bytes())
}
func getProvisionScript(script string, replaceMap map[string]string) string {
// add the provision script
bp, err := Asset(script)
if err != nil {
panic(fmt.Sprintf("BUG: %s", err.Error()))
}
pScript := string(bp)
if strings.Contains(pScript, "'") {
panic(fmt.Sprintf("BUG: %s may not contain character '", script))
}
for k, v := range replaceMap {
pScript = strings.Replace(pScript, k, v, -1)
}
return strings.Replace(strings.Replace(pScript, "\r\n", "\n", -1), "\n", "\n\n ", -1)
}
// getSingleLineCustomData returns the file as a single line for embedding in an arm template
func getSingleLineCustomData(yamlFilename string, replaceMap map[string]string) string {
b, err := Asset(yamlFilename)
if err != nil {
panic(fmt.Sprintf("BUG getting yaml custom data file: %s", err.Error()))
}
yamlStr := string(b)
for k, v := range replaceMap {
yamlStr = strings.Replace(yamlStr, k, v, -1)
}
// convert to json
jsonBytes, err4 := yaml.YAMLToJSON([]byte(yamlStr))
if err4 != nil {
panic(fmt.Sprintf("BUG: %s", err4.Error()))
}
yamlStr = string(jsonBytes)
// convert to one line
yamlStr = strings.Replace(yamlStr, "\\", "\\\\", -1)
yamlStr = strings.Replace(yamlStr, "\r\n", "\\n", -1)
yamlStr = strings.Replace(yamlStr, "\n", "\\n", -1)
yamlStr = strings.Replace(yamlStr, "\"", "\\\"", -1)
// variable replacement
rVariable, e1 := regexp.Compile("{{{([^}]*)}}}")
if e1 != nil {
panic(fmt.Sprintf("BUG: %s", e1.Error()))
}
yamlStr = rVariable.ReplaceAllString(yamlStr, "',variables('$1'),'")
return yamlStr
}
// getLinkedTemplateTextForURL returns the string data from
// template-link.json in the following directory:
// extensionsRootURL/extensions/extensionName/version
// It returns an error if the extension cannot be found
// or loaded. getLinkedTemplateTextForURL provides the ability
// to pass a root extensions url for testing
func getLinkedTemplateTextForURL1(rootURL, orchestrator, extensionName, version, query string) (string, error) {
supportsExtension, err := orchestratorSupportsExtension(rootURL, orchestrator, extensionName, version, query)
if !supportsExtension {
return "", fmt.Errorf("Extension not supported for orchestrator. Error: %s", err)
}
templateLinkBytes, err := getExtensionResource(rootURL, extensionName, version, "template-link.json", query)
if err != nil {
return "", err
}
return string(templateLinkBytes), nil
}
func orchestratorSupportsExtension(rootURL, orchestrator, extensionName, version, query string) (bool, error) {
orchestratorBytes, err := getExtensionResource(rootURL, extensionName, version, "supported-orchestrators.json", query)
if err != nil {
return false, err
}
var supportedOrchestrators []string
err = json.Unmarshal(orchestratorBytes, &supportedOrchestrators)
if err != nil {
return false, fmt.Errorf("Unable to parse supported-orchestrators.json for Extension %s Version %s", extensionName, version)
}
if !stringInSlice(orchestrator, supportedOrchestrators) {
return false, fmt.Errorf("Orchestrator: %s not in list of supported orchestrators for Extension: %s Version %s", orchestrator, extensionName, version)
}
return true, nil
}
func getExtensionResource(rootURL, extensionName, version, fileName, query string) ([]byte, error) {
requestURL := getExtensionURL(rootURL, extensionName, version, fileName, query)
res, err := http.Get(requestURL)
if err != nil {
return nil, fmt.Errorf("Unable to GET extension resource for extension: %s with version %s with filename %s at URL: %s Error: %s", extensionName, version, fileName, requestURL, err)
}
defer res.Body.Close()
if res.StatusCode != 200 {
return nil, fmt.Errorf("Unable to GET extension resource for extension: %s with version %s with filename %s at URL: %s StatusCode: %s: Status: %s", extensionName, version, fileName, requestURL, strconv.Itoa(res.StatusCode), res.Status)
}
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, fmt.Errorf("Unable to GET extension resource for extension: %s with version %s with filename %s at URL: %s Error: %s", extensionName, version, fileName, requestURL, err)
}
return body, nil
}
func getExtensionURL(rootURL, extensionName, version, fileName, query string) string {
extensionsDir := "extensions"
if !strings.HasSuffix(rootURL, "/") {
rootURL = rootURL + "/"
}
url := rootURL + extensionsDir + "/" + extensionName + "/" + version + "/" + fileName
if query != "" {
url += "?" + query
}
return url
}
func stringInSlice(a string, list []string) bool {
for _, b := range list {
if b == a {
return true
}
}
return false
}