forked from docker/libcompose
/
merge.go
299 lines (240 loc) · 6.3 KB
/
merge.go
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package project
import (
"bufio"
"bytes"
"fmt"
"path"
"strings"
"github.com/Sirupsen/logrus"
yaml "github.com/cloudfoundry-incubator/candiedyaml"
"github.com/docker/libcompose/utils"
)
var (
// ValidRemotes list the of valid prefixes that can be sent to Docker as a build remote location
// This is public for consumers of libcompose to use
ValidRemotes = []string{
"git://",
"git@github.com:",
"github.com",
"http:",
"https:",
}
noMerge = []string{
"links",
"volumes_from",
}
)
type rawService map[string]interface{}
type rawServiceMap map[string]rawService
func mergeProject(p *Project, bytes []byte) (map[string]*ServiceConfig, error) {
configs := make(map[string]*ServiceConfig)
datas := make(rawServiceMap)
if err := yaml.Unmarshal(bytes, &datas); err != nil {
return nil, err
}
if err := interpolate(p.context.EnvironmentLookup, &datas); err != nil {
return nil, err
}
for name, data := range datas {
data, err := parse(p.context.ConfigLookup, p.context.EnvironmentLookup, p.File, data, datas)
if err != nil {
logrus.Errorf("Failed to parse service %s: %v", name, err)
return nil, err
}
datas[name] = data
}
if err := utils.Convert(datas, &configs); err != nil {
return nil, err
}
adjustValues(configs)
return configs, nil
}
func adjustValues(configs map[string]*ServiceConfig) {
// yaml parser turns "no" into "false" but that is not valid for a restart policy
for _, v := range configs {
if v.Restart == "false" {
v.Restart = "no"
}
}
}
func readEnvFile(configLookup ConfigLookup, inFile string, serviceData rawService) (rawService, error) {
var config ServiceConfig
if err := utils.Convert(serviceData, &config); err != nil {
return nil, err
}
if len(config.EnvFile.Slice()) == 0 {
return serviceData, nil
}
if configLookup == nil {
return nil, fmt.Errorf("Can not use env_file in file %s no mechanism provided to load files", inFile)
}
vars := config.Environment.Slice()
for i := len(config.EnvFile.Slice()) - 1; i >= 0; i-- {
envFile := config.EnvFile.Slice()[i]
content, _, err := configLookup.Lookup(envFile, inFile)
if err != nil {
return nil, err
}
if err != nil {
return nil, err
}
scanner := bufio.NewScanner(bytes.NewBuffer(content))
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
key := strings.SplitAfter(line, "=")[0]
found := false
for _, v := range vars {
if strings.HasPrefix(v, key) {
found = true
break
}
}
if !found {
vars = append(vars, line)
}
}
if scanner.Err() != nil {
return nil, scanner.Err()
}
}
serviceData["environment"] = vars
delete(serviceData, "env_file")
return serviceData, nil
}
func resolveBuild(inFile string, serviceData rawService) (rawService, error) {
build := asString(serviceData["build"])
if build == "" {
return serviceData, nil
}
for _, remote := range ValidRemotes {
if strings.HasPrefix(build, remote) {
return serviceData, nil
}
}
current := path.Dir(inFile)
if build == "." {
build = current
} else {
current = path.Join(current, build)
}
serviceData["build"] = current
return serviceData, nil
}
func parse(configLookup ConfigLookup, environmentLookup EnvironmentLookup, inFile string, serviceData rawService, datas rawServiceMap) (rawService, error) {
serviceData, err := readEnvFile(configLookup, inFile, serviceData)
if err != nil {
return nil, err
}
serviceData, err = resolveBuild(inFile, serviceData)
if err != nil {
return nil, err
}
value, ok := serviceData["extends"]
if !ok {
return serviceData, nil
}
mapValue, ok := value.(map[interface{}]interface{})
if !ok {
return serviceData, nil
}
if configLookup == nil {
return nil, fmt.Errorf("Can not use extends in file %s no mechanism provided to files", inFile)
}
file := asString(mapValue["file"])
service := asString(mapValue["service"])
if service == "" {
return serviceData, nil
}
var baseService rawService
if file == "" {
if serviceData, ok := datas[service]; ok {
baseService, err = parse(configLookup, environmentLookup, inFile, serviceData, datas)
} else {
return nil, fmt.Errorf("Failed to find service %s to extend", service)
}
} else {
bytes, resolved, err := configLookup.Lookup(file, inFile)
if err != nil {
logrus.Errorf("Failed to lookup file %s: %v", file, err)
return nil, err
}
var baseRawServices rawServiceMap
if err := yaml.Unmarshal(bytes, &baseRawServices); err != nil {
return nil, err
}
err = interpolate(environmentLookup, &baseRawServices)
if err != nil {
return nil, err
}
baseService, ok = baseRawServices[service]
if !ok {
return nil, fmt.Errorf("Failed to find service %s in file %s", service, file)
}
baseService, err = parse(configLookup, environmentLookup, resolved, baseService, baseRawServices)
}
if err != nil {
return nil, err
}
baseService = clone(baseService)
logrus.Debugf("Merging %#v, %#v", baseService, serviceData)
for _, k := range noMerge {
if _, ok := baseService[k]; ok {
source := file
if source == "" {
source = inFile
}
return nil, fmt.Errorf("Cannot extend service '%s' in %s: services with '%s' cannot be extended", service, source, k)
}
}
for k, v := range serviceData {
// Image and build are mutually exclusive in merge
if k == "image" {
delete(baseService, "build")
} else if k == "build" {
delete(baseService, "image")
}
existing, ok := baseService[k]
if ok {
baseService[k] = merge(existing, v)
} else {
baseService[k] = v
}
}
logrus.Debugf("Merged result %#v", baseService)
return baseService, nil
}
func merge(existing, value interface{}) interface{} {
// append strings
if left, lok := existing.([]interface{}); lok {
if right, rok := value.([]interface{}); rok {
return append(left, right...)
}
}
//merge maps
if left, lok := existing.(map[interface{}]interface{}); lok {
if right, rok := value.(map[interface{}]interface{}); rok {
newLeft := make(map[interface{}]interface{})
for k, v := range left {
newLeft[k] = v
}
for k, v := range right {
newLeft[k] = v
}
return newLeft
}
}
return value
}
func clone(in rawService) rawService {
result := rawService{}
for k, v := range in {
result[k] = v
}
return result
}
func asString(obj interface{}) string {
if v, ok := obj.(string); ok {
return v
}
return ""
}