forked from hashicorp/nomad
/
parse_task.go
553 lines (470 loc) · 12.6 KB
/
parse_task.go
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package jobspec
import (
"fmt"
"time"
multierror "github.com/hashicorp/go-multierror"
"github.com/hashicorp/hcl"
"github.com/hashicorp/hcl/hcl/ast"
"github.com/hashicorp/nomad/api"
"github.com/hashicorp/nomad/helper"
"github.com/mitchellh/mapstructure"
)
func parseTasks(result *[]*api.Task, list *ast.ObjectList) error {
list = list.Children()
if len(list.Items) == 0 {
return nil
}
// Go through each object and turn it into an actual result.
seen := make(map[string]struct{})
for _, item := range list.Items {
n := item.Keys[0].Token.Value().(string)
// Make sure we haven't already found this
if _, ok := seen[n]; ok {
return fmt.Errorf("task '%s' defined more than once", n)
}
seen[n] = struct{}{}
t, err := parseTask(item)
if err != nil {
return multierror.Prefix(err, fmt.Sprintf("'%s',", n))
}
t.Name = n
*result = append(*result, t)
}
return nil
}
func parseTask(item *ast.ObjectItem) (*api.Task, error) {
// We need this later
var listVal *ast.ObjectList
if ot, ok := item.Val.(*ast.ObjectType); ok {
listVal = ot.List
} else {
return nil, fmt.Errorf("should be an object")
}
// Check for invalid keys
valid := []string{
"artifact",
"config",
"constraint",
"affinity",
"dispatch_payload",
"driver",
"env",
"kill_timeout",
"leader",
"logs",
"meta",
"resources",
"service",
"shutdown_delay",
"template",
"user",
"vault",
"kill_signal",
"kind",
"volume_mount",
}
if err := helper.CheckHCLKeys(listVal, valid); err != nil {
return nil, err
}
var m map[string]interface{}
if err := hcl.DecodeObject(&m, item.Val); err != nil {
return nil, err
}
delete(m, "artifact")
delete(m, "config")
delete(m, "constraint")
delete(m, "affinity")
delete(m, "dispatch_payload")
delete(m, "env")
delete(m, "logs")
delete(m, "meta")
delete(m, "resources")
delete(m, "service")
delete(m, "template")
delete(m, "vault")
delete(m, "volume_mount")
// Build the task
var t api.Task
dec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
DecodeHook: mapstructure.StringToTimeDurationHookFunc(),
WeaklyTypedInput: true,
Result: &t,
})
if err != nil {
return nil, err
}
if err := dec.Decode(m); err != nil {
return nil, err
}
// If we have env, then parse them
if o := listVal.Filter("env"); len(o.Items) > 0 {
for _, o := range o.Elem().Items {
var m map[string]interface{}
if err := hcl.DecodeObject(&m, o.Val); err != nil {
return nil, err
}
if err := mapstructure.WeakDecode(m, &t.Env); err != nil {
return nil, err
}
}
}
if o := listVal.Filter("service"); len(o.Items) > 0 {
services, err := parseServices(o)
if err != nil {
return nil, err
}
t.Services = services
}
// If we have config, then parse that
if o := listVal.Filter("config"); len(o.Items) > 0 {
for _, o := range o.Elem().Items {
var m map[string]interface{}
if err := hcl.DecodeObject(&m, o.Val); err != nil {
return nil, err
}
if err := mapstructure.WeakDecode(m, &t.Config); err != nil {
return nil, err
}
}
}
// Parse constraints
if o := listVal.Filter("constraint"); len(o.Items) > 0 {
if err := parseConstraints(&t.Constraints, o); err != nil {
return nil, multierror.Prefix(err, "constraint ->")
}
}
// Parse affinities
if o := listVal.Filter("affinity"); len(o.Items) > 0 {
if err := parseAffinities(&t.Affinities, o); err != nil {
return nil, multierror.Prefix(err, "affinity ->")
}
}
// Parse out meta fields. These are in HCL as a list so we need
// to iterate over them and merge them.
if metaO := listVal.Filter("meta"); len(metaO.Items) > 0 {
for _, o := range metaO.Elem().Items {
var m map[string]interface{}
if err := hcl.DecodeObject(&m, o.Val); err != nil {
return nil, err
}
if err := mapstructure.WeakDecode(m, &t.Meta); err != nil {
return nil, err
}
}
}
// Parse volume mounts
if o := listVal.Filter("volume_mount"); len(o.Items) > 0 {
if err := parseVolumeMounts(&t.VolumeMounts, o); err != nil {
return nil, multierror.Prefix(err, "volume_mount ->")
}
}
// If we have resources, then parse that
if o := listVal.Filter("resources"); len(o.Items) > 0 {
var r api.Resources
if err := parseResources(&r, o); err != nil {
return nil, multierror.Prefix(err, "resources ->")
}
t.Resources = &r
}
// If we have logs then parse that
if o := listVal.Filter("logs"); len(o.Items) > 0 {
if len(o.Items) > 1 {
return nil, fmt.Errorf("only one logs block is allowed in a Task. Number of logs block found: %d", len(o.Items))
}
var m map[string]interface{}
logsBlock := o.Items[0]
// Check for invalid keys
valid := []string{
"max_files",
"max_file_size",
}
if err := helper.CheckHCLKeys(logsBlock.Val, valid); err != nil {
return nil, multierror.Prefix(err, "logs ->")
}
if err := hcl.DecodeObject(&m, logsBlock.Val); err != nil {
return nil, err
}
var log api.LogConfig
if err := mapstructure.WeakDecode(m, &log); err != nil {
return nil, err
}
t.LogConfig = &log
}
// Parse artifacts
if o := listVal.Filter("artifact"); len(o.Items) > 0 {
if err := parseArtifacts(&t.Artifacts, o); err != nil {
return nil, multierror.Prefix(err, "artifact ->")
}
}
// Parse templates
if o := listVal.Filter("template"); len(o.Items) > 0 {
if err := parseTemplates(&t.Templates, o); err != nil {
return nil, multierror.Prefix(err, "template ->")
}
}
// If we have a vault block, then parse that
if o := listVal.Filter("vault"); len(o.Items) > 0 {
v := &api.Vault{
Env: helper.BoolToPtr(true),
ChangeMode: helper.StringToPtr("restart"),
}
if err := parseVault(v, o); err != nil {
return nil, multierror.Prefix(err, "vault ->")
}
t.Vault = v
}
// If we have a dispatch_payload block parse that
if o := listVal.Filter("dispatch_payload"); len(o.Items) > 0 {
if len(o.Items) > 1 {
return nil, fmt.Errorf("only one dispatch_payload block is allowed in a task. Number of dispatch_payload blocks found: %d", len(o.Items))
}
var m map[string]interface{}
dispatchBlock := o.Items[0]
// Check for invalid keys
valid := []string{
"file",
}
if err := helper.CheckHCLKeys(dispatchBlock.Val, valid); err != nil {
return nil, multierror.Prefix(err, "dispatch_payload ->")
}
if err := hcl.DecodeObject(&m, dispatchBlock.Val); err != nil {
return nil, err
}
t.DispatchPayload = &api.DispatchPayloadConfig{}
if err := mapstructure.WeakDecode(m, t.DispatchPayload); err != nil {
return nil, err
}
}
return &t, nil
}
func parseArtifacts(result *[]*api.TaskArtifact, list *ast.ObjectList) error {
for _, o := range list.Elem().Items {
// Check for invalid keys
valid := []string{
"source",
"options",
"mode",
"destination",
}
if err := helper.CheckHCLKeys(o.Val, valid); err != nil {
return err
}
var m map[string]interface{}
if err := hcl.DecodeObject(&m, o.Val); err != nil {
return err
}
delete(m, "options")
var ta api.TaskArtifact
if err := mapstructure.WeakDecode(m, &ta); err != nil {
return err
}
var optionList *ast.ObjectList
if ot, ok := o.Val.(*ast.ObjectType); ok {
optionList = ot.List
} else {
return fmt.Errorf("artifact should be an object")
}
if oo := optionList.Filter("options"); len(oo.Items) > 0 {
options := make(map[string]string)
if err := parseArtifactOption(options, oo); err != nil {
return multierror.Prefix(err, "options: ")
}
ta.GetterOptions = options
}
*result = append(*result, &ta)
}
return nil
}
func parseArtifactOption(result map[string]string, list *ast.ObjectList) error {
list = list.Elem()
if len(list.Items) > 1 {
return fmt.Errorf("only one 'options' block allowed per artifact")
}
// Get our resource object
o := list.Items[0]
var m map[string]interface{}
if err := hcl.DecodeObject(&m, o.Val); err != nil {
return err
}
if err := mapstructure.WeakDecode(m, &result); err != nil {
return err
}
return nil
}
func parseTemplates(result *[]*api.Template, list *ast.ObjectList) error {
for _, o := range list.Elem().Items {
// Check for invalid keys
valid := []string{
"change_mode",
"change_signal",
"data",
"destination",
"left_delimiter",
"perms",
"right_delimiter",
"source",
"splay",
"env",
"vault_grace",
}
if err := helper.CheckHCLKeys(o.Val, valid); err != nil {
return err
}
var m map[string]interface{}
if err := hcl.DecodeObject(&m, o.Val); err != nil {
return err
}
templ := &api.Template{
ChangeMode: helper.StringToPtr("restart"),
Splay: helper.TimeToPtr(5 * time.Second),
Perms: helper.StringToPtr("0644"),
}
dec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
DecodeHook: mapstructure.StringToTimeDurationHookFunc(),
WeaklyTypedInput: true,
Result: templ,
})
if err != nil {
return err
}
if err := dec.Decode(m); err != nil {
return err
}
*result = append(*result, templ)
}
return nil
}
func parseResources(result *api.Resources, list *ast.ObjectList) error {
list = list.Elem()
if len(list.Items) == 0 {
return nil
}
if len(list.Items) > 1 {
return fmt.Errorf("only one 'resource' block allowed per task")
}
// Get our resource object
o := list.Items[0]
// We need this later
var listVal *ast.ObjectList
if ot, ok := o.Val.(*ast.ObjectType); ok {
listVal = ot.List
} else {
return fmt.Errorf("resource: should be an object")
}
// Check for invalid keys
valid := []string{
"cpu",
"iops", // COMPAT(0.10): Remove after one release to allow it to be removed from jobspecs
"disk",
"memory",
"network",
"device",
}
if err := helper.CheckHCLKeys(listVal, valid); err != nil {
return multierror.Prefix(err, "resources ->")
}
var m map[string]interface{}
if err := hcl.DecodeObject(&m, o.Val); err != nil {
return err
}
delete(m, "network")
delete(m, "device")
if err := mapstructure.WeakDecode(m, result); err != nil {
return err
}
// Parse the network resources
if o := listVal.Filter("network"); len(o.Items) > 0 {
r, err := ParseNetwork(o)
if err != nil {
return fmt.Errorf("resource, %v", err)
}
result.Networks = []*api.NetworkResource{r}
}
// Parse the device resources
if o := listVal.Filter("device"); len(o.Items) > 0 {
result.Devices = make([]*api.RequestedDevice, len(o.Items))
for idx, do := range o.Items {
if l := len(do.Keys); l == 0 {
return multierror.Prefix(fmt.Errorf("missing device name"), fmt.Sprintf("resources, device[%d]->", idx))
} else if l > 1 {
return multierror.Prefix(fmt.Errorf("only one name may be specified"), fmt.Sprintf("resources, device[%d]->", idx))
}
name := do.Keys[0].Token.Value().(string)
// Value should be an object
var listVal *ast.ObjectList
if ot, ok := do.Val.(*ast.ObjectType); ok {
listVal = ot.List
} else {
return fmt.Errorf("device should be an object")
}
// Check for invalid keys
valid := []string{
"name",
"count",
"affinity",
"constraint",
}
if err := helper.CheckHCLKeys(do.Val, valid); err != nil {
return multierror.Prefix(err, fmt.Sprintf("resources, device[%d]->", idx))
}
// Set the name
var r api.RequestedDevice
r.Name = name
var m map[string]interface{}
if err := hcl.DecodeObject(&m, do.Val); err != nil {
return err
}
delete(m, "constraint")
delete(m, "affinity")
if err := mapstructure.WeakDecode(m, &r); err != nil {
return err
}
// Parse constraints
if o := listVal.Filter("constraint"); len(o.Items) > 0 {
if err := parseConstraints(&r.Constraints, o); err != nil {
return multierror.Prefix(err, "constraint ->")
}
}
// Parse affinities
if o := listVal.Filter("affinity"); len(o.Items) > 0 {
if err := parseAffinities(&r.Affinities, o); err != nil {
return multierror.Prefix(err, "affinity ->")
}
}
result.Devices[idx] = &r
}
}
return nil
}
func parseVolumeMounts(out *[]*api.VolumeMount, list *ast.ObjectList) error {
mounts := make([]*api.VolumeMount, len(list.Items))
for i, item := range list.Items {
valid := []string{
"volume",
"read_only",
"destination",
"propagation_mode",
}
if err := helper.CheckHCLKeys(item.Val, valid); err != nil {
return err
}
var m map[string]interface{}
if err := hcl.DecodeObject(&m, item.Val); err != nil {
return err
}
var result api.VolumeMount
dec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
WeaklyTypedInput: true,
Result: &result,
})
if err != nil {
return err
}
if err := dec.Decode(m); err != nil {
return err
}
mounts[i] = &result
}
*out = mounts
return nil
}