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api_changes.go
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api_changes.go
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// Copyright (c) 2014-2020 Canonical Ltd
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3 as
// published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package daemon
import (
"encoding/json"
"net/http"
"time"
"github.com/canonical/pebble/internals/logger"
"github.com/canonical/pebble/internals/overlord/state"
)
type changeInfo struct {
ID string `json:"id"`
Kind string `json:"kind"`
Summary string `json:"summary"`
Status string `json:"status"`
Tasks []*taskInfo `json:"tasks,omitempty"`
Ready bool `json:"ready"`
Err string `json:"err,omitempty"`
SpawnTime time.Time `json:"spawn-time,omitempty"`
ReadyTime *time.Time `json:"ready-time,omitempty"`
Data map[string]*json.RawMessage `json:"data,omitempty"`
}
type taskInfo struct {
ID string `json:"id"`
Kind string `json:"kind"`
Summary string `json:"summary"`
Status string `json:"status"`
Log []string `json:"log,omitempty"`
Progress taskInfoProgress `json:"progress"`
SpawnTime time.Time `json:"spawn-time,omitempty"`
ReadyTime *time.Time `json:"ready-time,omitempty"`
Data map[string]*json.RawMessage `json:"data,omitempty"`
}
type taskInfoProgress struct {
Label string `json:"label"`
Done int `json:"done"`
Total int `json:"total"`
}
func change2changeInfo(chg *state.Change) *changeInfo {
status := chg.Status()
chgInfo := &changeInfo{
ID: chg.ID(),
Kind: chg.Kind(),
Summary: chg.Summary(),
Status: status.String(),
Ready: status.Ready(),
SpawnTime: chg.SpawnTime(),
}
readyTime := chg.ReadyTime()
if !readyTime.IsZero() {
chgInfo.ReadyTime = &readyTime
}
if err := chg.Err(); err != nil {
chgInfo.Err = err.Error()
}
tasks := chg.Tasks()
taskInfos := make([]*taskInfo, len(tasks))
for j, t := range tasks {
label, done, total := t.Progress()
taskInfo := &taskInfo{
ID: t.ID(),
Kind: t.Kind(),
Summary: t.Summary(),
Status: t.Status().String(),
Log: t.Log(),
Progress: taskInfoProgress{
Label: label,
Done: done,
Total: total,
},
SpawnTime: t.SpawnTime(),
}
readyTime := t.ReadyTime()
if !readyTime.IsZero() {
taskInfo.ReadyTime = &readyTime
}
var data map[string]*json.RawMessage
if t.Get("api-data", &data) == nil {
taskInfo.Data = data
}
taskInfos[j] = taskInfo
}
chgInfo.Tasks = taskInfos
var data map[string]*json.RawMessage
if chg.Get("api-data", &data) == nil {
chgInfo.Data = data
}
return chgInfo
}
func v1GetChanges(c *Command, r *http.Request, _ *UserState) Response {
query := r.URL.Query()
qselect := query.Get("select")
if qselect == "" {
qselect = "in-progress"
}
var filter func(*state.Change) bool
switch qselect {
case "all":
filter = func(*state.Change) bool { return true }
case "in-progress":
filter = func(chg *state.Change) bool { return !chg.Status().Ready() }
case "ready":
filter = func(chg *state.Change) bool { return chg.Status().Ready() }
default:
return statusBadRequest("select should be one of: all,in-progress,ready")
}
if wantedName := query.Get("for"); wantedName != "" {
outerFilter := filter
filter = func(chg *state.Change) bool {
if !outerFilter(chg) {
return false
}
var serviceNames []string
if err := chg.Get("service-names", &serviceNames); err != nil {
logger.Noticef("Cannot get service-name for change %v", chg.ID())
return false
}
for _, serviceName := range serviceNames {
if serviceName == wantedName {
return true
}
}
return false
}
}
state := c.d.overlord.State()
state.Lock()
defer state.Unlock()
chgs := state.Changes()
chgInfos := make([]*changeInfo, 0, len(chgs))
for _, chg := range chgs {
if !filter(chg) {
continue
}
chgInfos = append(chgInfos, change2changeInfo(chg))
}
return SyncResponse(chgInfos)
}
func v1GetChange(c *Command, r *http.Request, _ *UserState) Response {
changeID := muxVars(r)["id"]
st := c.d.overlord.State()
st.Lock()
defer st.Unlock()
chg := st.Change(changeID)
if chg == nil {
return statusNotFound("cannot find change with id %q", changeID)
}
return SyncResponse(change2changeInfo(chg))
}
func v1GetChangeWait(c *Command, r *http.Request, _ *UserState) Response {
changeID := muxVars(r)["id"]
st := c.d.overlord.State()
st.Lock()
change := st.Change(changeID)
st.Unlock()
if change == nil {
return statusNotFound("cannot find change with id %q", changeID)
}
timeout, err := parseOptionalDuration(r.URL.Query().Get("timeout"))
if err != nil {
return statusBadRequest("invalid timeout: %v", err)
}
if timeout != 0 {
// Timeout specified, wait till change is ready or timeout occurs,
// whichever is first.
timer := time.NewTimer(timeout)
select {
case <-change.Ready():
timer.Stop() // change ready, release timer resources
case <-timer.C:
return statusGatewayTimeout("timed out waiting for change after %s", timeout)
case <-r.Context().Done():
return statusInternalError("request cancelled")
}
} else {
// No timeout, wait indefinitely for change to be ready.
select {
case <-change.Ready():
case <-r.Context().Done():
return statusInternalError("request cancelled")
}
}
st.Lock()
defer st.Unlock()
return SyncResponse(change2changeInfo(change))
}
func v1PostChange(c *Command, r *http.Request, _ *UserState) Response {
chID := muxVars(r)["id"]
state := c.d.overlord.State()
state.Lock()
defer state.Unlock()
chg := state.Change(chID)
if chg == nil {
return statusNotFound("cannot find change with id %q", chID)
}
var reqData struct {
Action string `json:"action"`
}
decoder := json.NewDecoder(r.Body)
if err := decoder.Decode(&reqData); err != nil {
return statusBadRequest("cannot decode data from request body: %v", err)
}
if reqData.Action != "abort" {
return statusBadRequest("change action %q is unsupported", reqData.Action)
}
if chg.Status().Ready() {
return statusBadRequest("cannot abort change %s with nothing pending", chID)
}
// flag the change
chg.Abort()
// actually ask to proceed with the abort
stateEnsureBefore(state, 0)
return SyncResponse(change2changeInfo(chg))
}