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instance.go
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instance.go
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package tweed
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"strings"
)
const (
// don't forget to update the api/responses.go copies as well!
QuietState = "quiet"
ProvisioningState = "provisioning"
DeprovisioningState = "deprovisioning"
GoneState = "gone"
BindingState = "binding"
UnbindingState = "unbinding"
)
type Instance struct {
ID string
Plan *Plan
State string
Root string
Prefix string
VaultPrefix string
UserParameters map[string]interface{}
Bindings map[string]map[string]interface{}
Tasks []*task
}
type instancemf struct {
Tweed struct {
Prefix string `json:"prefix"`
Instance string `json:"instance"`
Service string `json:"service"`
ServiceID string `json:"service_id"`
Plan string `json:"plan"`
PlanID string `json:"plan_id"`
Vault string `json:"vault"`
Ops map[string]interface{} `json:"ops"`
User map[string]interface{} `json:"user"`
} `json:"tweed"`
}
func (i *Instance) path(rel string) string {
return fmt.Sprintf("%s/%s", i.Root, rel)
}
func (i *Instance) my(rel string) string {
if rel != "" {
rel = "/" + strings.TrimPrefix(rel, "/")
}
return i.path("data/instances/" + i.ID + rel)
}
func (i *Instance) env(env []string) []string {
env = append(env, "HOME="+i.path(""))
env = append(env, "PATH="+os.Getenv("PATH"))
env = append(env, "LANG="+os.Getenv("LANG"))
env = append(env, "INFRASTRUCTURE="+i.path("etc/infrastructures/"+i.Plan.Tweed.Infrastructure))
env = append(env, "STENCIL="+i.path("etc/stencils/"+i.Plan.Tweed.Stencil))
env = append(env, "WORKSPACE="+i.my(""))
env = append(env, "VAULT="+i.VaultPrefix+"/"+i.ID)
env = append(env, "INPUTS=instance.mf")
return env
}
func ParseInstance(cat Catalog, root string, b []byte) (Instance, error) {
var in instancemf
err := json.Unmarshal(b, &in)
if err != nil {
return Instance{}, err
}
p, err := cat.FindPlan(in.Tweed.ServiceID, in.Tweed.PlanID)
if err != nil {
return Instance{}, err
}
inst := Instance{
ID: in.Tweed.Instance,
Root: root,
Plan: p,
UserParameters: in.Tweed.User,
State: QuietState,
}
b, err = ioutil.ReadFile(inst.my("lifecycle/data/state"))
if err == nil {
inst.State = strings.TrimSpace(string(b))
}
return inst, nil
}
func (i *Instance) lookupBindings(id string) error {
if i.Bindings == nil {
i.Bindings = make(map[string]map[string]interface{})
}
b, err := run1(Exec{
Run: i.path("bin/bindings"),
Env: i.env([]string{"BINDING=" + id}),
})
if err != nil {
return err
}
var all map[string]map[string]interface{}
err = json.Unmarshal(b, &all)
if err != nil {
return err
}
for _, bindings := range all {
for id, raw := range bindings {
s, ok := raw.(string)
if !ok {
return fmt.Errorf("binding %s/%s is not a string")
}
var v map[string]interface{}
if err := json.Unmarshal([]byte(s), &v); err != nil {
return err
}
i.Bindings[id] = v
}
}
return nil
}
func (i *Instance) LookupBindings() error {
return i.lookupBindings("")
}
func (i *Instance) LookupBinding(id string) error {
return i.lookupBindings(id)
}
func (i *Instance) Log() string {
b, _ := ioutil.ReadFile(i.my("log"))
return string(b)
}
func (i *Instance) do(cmd, begin, middle, end string) (*task, error) {
if begin != "" && i.State != begin {
return nil, fmt.Errorf("service instance '%s' is currently %s", i.ID, i.State)
}
i.State = middle
t := background(Exec{
Run: i.path(cmd),
Env: i.env(nil),
}, func() {
fmt.Printf("updating state to '%s'\n", end)
i.State = end
})
i.Tasks = append(i.Tasks, t)
return t, nil
}
func (i *Instance) Provision() (*task, error) {
if err := i.Viable(); err != nil {
return nil, err
}
var out instancemf
out.Tweed.Prefix = i.Prefix
out.Tweed.Instance = i.ID
out.Tweed.Service = i.Plan.Service.Name
out.Tweed.ServiceID = i.Plan.Service.ID
out.Tweed.Plan = i.Plan.Name
out.Tweed.PlanID = i.Plan.ID
out.Tweed.Vault = `(( concat "` + i.VaultPrefix + `/" tweed.instance ))`
out.Tweed.Ops = i.Plan.Tweed.Config
out.Tweed.User = i.UserParameters
input, err := json.Marshal(out)
if err != nil {
return nil, err
}
root := i.my("")
if err := os.MkdirAll(root, 0755); err != nil {
return nil, err
}
if err := ioutil.WriteFile(root+"/instance.mf", input, 0666); err != nil {
return nil, err
}
return i.do("bin/provision", "", ProvisioningState, QuietState)
}
func (i *Instance) Bind(id string) (*task, error) {
if i.State != QuietState {
return nil, fmt.Errorf("service instance '%s' is currently %s", i.ID, i.State)
}
if err := i.Viable(); err != nil {
return nil, err
}
i.State = BindingState
t := background(Exec{
Run: i.path("bin/bind"),
Env: i.env([]string{
"BINDING=" + id,
"OVERRIDES=" + i.CredentialOverrides(),
}),
}, func() {
i.State = QuietState
if err := i.LookupBinding(id); err != nil {
fmt.Fprintf(os.Stderr, "failed to look up newly-created binding %s/%s: %s", i.ID, id, err)
}
})
i.Tasks = append(i.Tasks, t)
return t, nil
}
func (i *Instance) Unbind(id string) (*task, error) {
if i.State != QuietState {
return nil, fmt.Errorf("service instance '%s' is currently %s", i.ID, i.State)
}
if err := i.Viable(); err != nil {
return nil, err
}
i.State = UnbindingState
t := background(Exec{
Run: i.path("bin/unbind"),
Env: i.env([]string{"BINDING=" + id}),
}, func() {
i.State = QuietState
delete(i.Bindings, id)
})
i.Tasks = append(i.Tasks, t)
return t, nil
}
func (i *Instance) Deprovision() (*task, error) {
if err := i.Viable(); err != nil {
return nil, err
}
return i.do("bin/deprovision", QuietState, DeprovisioningState, GoneState)
}
func (i *Instance) Purge() error {
if i.State != GoneState {
return fmt.Errorf("service instance '%s' is currently %s", i.ID, i.State)
}
return os.RemoveAll(i.my(""))
}
func (i *Instance) Viable() error {
out, err := run1(Exec{
Run: i.path("bin/viable"),
Env: i.env(nil),
})
if err != nil {
return fmt.Errorf("stencil viability check failed: %s", string(out))
}
return nil
}
func (i *Instance) CredentialOverrides() string {
if i.Plan.Tweed.Credentials == nil {
return `{}`
}
out := map[string]interface{}{
"credentials": i.Plan.Tweed.Credentials,
}
if b, err := json.Marshal(&out); err != nil {
return `{}`
} else {
return string(b)
}
}
func (i *Instance) Files() ([]File, error) {
out, err := run1(Exec{
Run: i.path("bin/files"),
Env: i.env(nil),
})
if err != nil {
return nil, err
}
var f struct {
Files []File `json:"files"`
}
return f.Files, json.Unmarshal(out, &f)
}
func (i Instance) IsBusy() bool {
return i.State == ProvisioningState || i.State == DeprovisioningState || i.State == BindingState || i.State == UnbindingState
}
func (i Instance) IsQuiet() bool {
return i.State == QuietState
}
func (i Instance) IsGone() bool {
return i.State == GoneState
}