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backend_common.go
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backend_common.go
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package remote
import (
"bufio"
"context"
"errors"
"fmt"
"io"
"math"
"strconv"
"strings"
"time"
tfe "github.com/hashicorp/go-tfe"
"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/terraform"
)
var (
errApplyDiscarded = errors.New("Apply discarded.")
errDestroyDiscarded = errors.New("Destroy discarded.")
errRunApproved = errors.New("approved using the UI or API")
errRunDiscarded = errors.New("discarded using the UI or API")
errRunOverridden = errors.New("overridden using the UI or API")
)
// backoff will perform exponential backoff based on the iteration and
// limited by the provided min and max (in milliseconds) durations.
func backoff(min, max float64, iter int) time.Duration {
backoff := math.Pow(2, float64(iter)/5) * min
if backoff > max {
backoff = max
}
return time.Duration(backoff) * time.Millisecond
}
func (b *Remote) waitForRun(stopCtx, cancelCtx context.Context, op *backend.Operation, opType string, r *tfe.Run, w *tfe.Workspace) (*tfe.Run, error) {
started := time.Now()
updated := started
for i := 0; ; i++ {
select {
case <-stopCtx.Done():
return r, stopCtx.Err()
case <-cancelCtx.Done():
return r, cancelCtx.Err()
case <-time.After(backoff(1000, 3000, i)):
// Timer up, show status
}
// Retrieve the run to get its current status.
r, err := b.client.Runs.Read(stopCtx, r.ID)
if err != nil {
return r, generalError("Failed to retrieve run", err)
}
// Return if the run is no longer pending.
if r.Status != tfe.RunPending && r.Status != tfe.RunConfirmed {
if i == 0 && opType == "plan" && b.CLI != nil {
b.CLI.Output(b.Colorize().Color(fmt.Sprintf("Waiting for the %s to start...\n", opType)))
}
if i > 0 && b.CLI != nil {
// Insert a blank line to separate the ouputs.
b.CLI.Output("")
}
return r, nil
}
// Check if 30 seconds have passed since the last update.
current := time.Now()
if b.CLI != nil && (i == 0 || current.Sub(updated).Seconds() > 30) {
updated = current
position := 0
elapsed := ""
// Calculate and set the elapsed time.
if i > 0 {
elapsed = fmt.Sprintf(
" (%s elapsed)", current.Sub(started).Truncate(30*time.Second))
}
// Retrieve the workspace used to run this operation in.
w, err = b.client.Workspaces.Read(stopCtx, b.organization, w.Name)
if err != nil {
return nil, generalError("Failed to retrieve workspace", err)
}
// If the workspace is locked the run will not be queued and we can
// update the status without making any expensive calls.
if w.Locked && w.CurrentRun != nil {
cr, err := b.client.Runs.Read(stopCtx, w.CurrentRun.ID)
if err != nil {
return r, generalError("Failed to retrieve current run", err)
}
if cr.Status == tfe.RunPending {
b.CLI.Output(b.Colorize().Color(
"Waiting for the manually locked workspace to be unlocked..." + elapsed))
continue
}
}
// Skip checking the workspace queue when we are the current run.
if w.CurrentRun == nil || w.CurrentRun.ID != r.ID {
found := false
options := tfe.RunListOptions{}
runlist:
for {
rl, err := b.client.Runs.List(stopCtx, w.ID, options)
if err != nil {
return r, generalError("Failed to retrieve run list", err)
}
// Loop through all runs to calculate the workspace queue position.
for _, item := range rl.Items {
if !found {
if r.ID == item.ID {
found = true
}
continue
}
// If the run is in a final state, ignore it and continue.
switch item.Status {
case tfe.RunApplied, tfe.RunCanceled, tfe.RunDiscarded, tfe.RunErrored:
continue
case tfe.RunPlanned:
if op.Type == backend.OperationTypePlan {
continue
}
}
// Increase the workspace queue position.
position++
// Stop searching when we reached the current run.
if w.CurrentRun != nil && w.CurrentRun.ID == item.ID {
break runlist
}
}
// Exit the loop when we've seen all pages.
if rl.CurrentPage >= rl.TotalPages {
break
}
// Update the page number to get the next page.
options.PageNumber = rl.NextPage
}
if position > 0 {
b.CLI.Output(b.Colorize().Color(fmt.Sprintf(
"Waiting for %d run(s) to finish before being queued...%s",
position,
elapsed,
)))
continue
}
}
options := tfe.RunQueueOptions{}
search:
for {
rq, err := b.client.Organizations.RunQueue(stopCtx, b.organization, options)
if err != nil {
return r, generalError("Failed to retrieve queue", err)
}
// Search through all queued items to find our run.
for _, item := range rq.Items {
if r.ID == item.ID {
position = item.PositionInQueue
break search
}
}
// Exit the loop when we've seen all pages.
if rq.CurrentPage >= rq.TotalPages {
break
}
// Update the page number to get the next page.
options.PageNumber = rq.NextPage
}
if position > 0 {
c, err := b.client.Organizations.Capacity(stopCtx, b.organization)
if err != nil {
return r, generalError("Failed to retrieve capacity", err)
}
b.CLI.Output(b.Colorize().Color(fmt.Sprintf(
"Waiting for %d queued run(s) to finish before starting...%s",
position-c.Running,
elapsed,
)))
continue
}
b.CLI.Output(b.Colorize().Color(fmt.Sprintf(
"Waiting for the %s to start...%s", opType, elapsed)))
}
}
}
// hasExplicitVariableValues is a best-effort check to determine whether the
// user has provided -var or -var-file arguments to a remote operation.
//
// The results may be inaccurate if the configuration is invalid or if
// individual variable values are invalid. That's okay because we only use this
// result to hint the user to set variables a different way. It's always the
// remote system's responsibility to do final validation of the input.
func (b *Remote) hasExplicitVariableValues(op *backend.Operation) bool {
// Load the configuration using the caller-provided configuration loader.
config, _, configDiags := op.ConfigLoader.LoadConfigWithSnapshot(op.ConfigDir)
if configDiags.HasErrors() {
// If we can't load the configuration then we'll assume no explicit
// variable values just to let the remote operation start and let
// the remote system return the same set of configuration errors.
return false
}
// We're intentionally ignoring the diagnostics here because validation
// of the variable values is the responsibilty of the remote system. Our
// goal here is just to make a best effort count of how many variable
// values are coming from -var or -var-file CLI arguments so that we can
// hint the user that those are not supported for remote operations.
variables, _ := backend.ParseVariableValues(op.Variables, config.Module.Variables)
// Check for explicitly-defined (-var and -var-file) variables, which the
// remote backend does not support. All other source types are okay,
// because they are implicit from the execution context anyway and so
// their final values will come from the _remote_ execution context.
for _, v := range variables {
switch v.SourceType {
case terraform.ValueFromCLIArg, terraform.ValueFromNamedFile:
return true
}
}
return false
}
func (b *Remote) costEstimate(stopCtx, cancelCtx context.Context, op *backend.Operation, r *tfe.Run) error {
if r.CostEstimate == nil {
return nil
}
if b.CLI != nil {
b.CLI.Output("\n------------------------------------------------------------------------\n")
}
msgPrefix := "Cost estimation"
if b.CLI != nil {
b.CLI.Output(b.Colorize().Color(msgPrefix + ":\n"))
}
started := time.Now()
updated := started
for i := 0; ; i++ {
select {
case <-stopCtx.Done():
return stopCtx.Err()
case <-cancelCtx.Done():
return cancelCtx.Err()
case <-time.After(1 * time.Second):
}
// Retrieve the cost estimate to get its current status.
ce, err := b.client.CostEstimates.Read(stopCtx, r.CostEstimate.ID)
if err != nil {
return generalError("Failed to retrieve cost estimate", err)
}
switch ce.Status {
case tfe.CostEstimateFinished:
delta, err := strconv.ParseFloat(ce.DeltaMonthlyCost, 64)
if err != nil {
return generalError("Unexpected error", err)
}
sign := "+"
if delta < 0 {
sign = "-"
}
deltaRepr := strings.Replace(ce.DeltaMonthlyCost, "-", "", 1)
if b.CLI != nil {
b.CLI.Output(b.Colorize().Color(fmt.Sprintf("Resources: %d of %d estimated", ce.MatchedResourcesCount, ce.ResourcesCount)))
b.CLI.Output(b.Colorize().Color(fmt.Sprintf(" $%s/mo %s$%s", ce.ProposedMonthlyCost, sign, deltaRepr)))
if len(r.PolicyChecks) == 0 && r.HasChanges && op.Type == backend.OperationTypeApply {
b.CLI.Output("\n------------------------------------------------------------------------")
}
}
return nil
case tfe.CostEstimatePending, tfe.CostEstimateQueued:
// Check if 30 seconds have passed since the last update.
current := time.Now()
if b.CLI != nil && (i == 0 || current.Sub(updated).Seconds() > 30) {
updated = current
elapsed := ""
// Calculate and set the elapsed time.
if i > 0 {
elapsed = fmt.Sprintf(
" (%s elapsed)", current.Sub(started).Truncate(30*time.Second))
}
b.CLI.Output(b.Colorize().Color("Waiting for cost estimate to complete..." + elapsed + "\n"))
}
continue
case tfe.CostEstimateErrored:
return fmt.Errorf(msgPrefix + " errored.")
case tfe.CostEstimateCanceled:
return fmt.Errorf(msgPrefix + " canceled.")
default:
return fmt.Errorf("Unknown or unexpected cost estimate state: %s", ce.Status)
}
}
return nil
}
func (b *Remote) checkPolicy(stopCtx, cancelCtx context.Context, op *backend.Operation, r *tfe.Run) error {
if b.CLI != nil {
b.CLI.Output("\n------------------------------------------------------------------------\n")
}
for i, pc := range r.PolicyChecks {
logs, err := b.client.PolicyChecks.Logs(stopCtx, pc.ID)
if err != nil {
return generalError("Failed to retrieve policy check logs", err)
}
reader := bufio.NewReaderSize(logs, 64*1024)
// Retrieve the policy check to get its current status.
pc, err := b.client.PolicyChecks.Read(stopCtx, pc.ID)
if err != nil {
return generalError("Failed to retrieve policy check", err)
}
var msgPrefix string
switch pc.Scope {
case tfe.PolicyScopeOrganization:
msgPrefix = "Organization policy check"
case tfe.PolicyScopeWorkspace:
msgPrefix = "Workspace policy check"
default:
msgPrefix = fmt.Sprintf("Unknown policy check (%s)", pc.Scope)
}
if b.CLI != nil {
b.CLI.Output(b.Colorize().Color(msgPrefix + ":\n"))
}
if b.CLI != nil {
for next := true; next; {
var l, line []byte
for isPrefix := true; isPrefix; {
l, isPrefix, err = reader.ReadLine()
if err != nil {
if err != io.EOF {
return generalError("Failed to read logs", err)
}
next = false
}
line = append(line, l...)
}
if next || len(line) > 0 {
b.CLI.Output(b.Colorize().Color(string(line)))
}
}
}
switch pc.Status {
case tfe.PolicyPasses:
if (r.HasChanges && op.Type == backend.OperationTypeApply || i < len(r.PolicyChecks)-1) && b.CLI != nil {
b.CLI.Output("\n------------------------------------------------------------------------")
}
continue
case tfe.PolicyErrored:
return fmt.Errorf(msgPrefix + " errored.")
case tfe.PolicyHardFailed:
return fmt.Errorf(msgPrefix + " hard failed.")
case tfe.PolicySoftFailed:
if op.Type == backend.OperationTypePlan || op.UIOut == nil || op.UIIn == nil ||
op.AutoApprove || !pc.Actions.IsOverridable || !pc.Permissions.CanOverride {
return fmt.Errorf(msgPrefix + " soft failed.")
}
default:
return fmt.Errorf("Unknown or unexpected policy state: %s", pc.Status)
}
opts := &terraform.InputOpts{
Id: "override",
Query: "\nDo you want to override the soft failed policy check?",
Description: "Only 'override' will be accepted to override.",
}
err = b.confirm(stopCtx, op, opts, r, "override")
if err != nil && err != errRunOverridden {
return err
}
if err != errRunOverridden {
if _, err = b.client.PolicyChecks.Override(stopCtx, pc.ID); err != nil {
return generalError("Failed to override policy check", err)
}
}
if b.CLI != nil {
b.CLI.Output("------------------------------------------------------------------------")
}
}
return nil
}
func (b *Remote) confirm(stopCtx context.Context, op *backend.Operation, opts *terraform.InputOpts, r *tfe.Run, keyword string) error {
doneCtx, cancel := context.WithCancel(stopCtx)
result := make(chan error, 2)
go func() {
// Make sure we cancel doneCtx before we return
// so the input command is also canceled.
defer cancel()
for {
select {
case <-doneCtx.Done():
return
case <-stopCtx.Done():
return
case <-time.After(3 * time.Second):
// Retrieve the run again to get its current status.
r, err := b.client.Runs.Read(stopCtx, r.ID)
if err != nil {
result <- generalError("Failed to retrieve run", err)
return
}
switch keyword {
case "override":
if r.Status != tfe.RunPolicyOverride {
if r.Status == tfe.RunDiscarded {
err = errRunDiscarded
} else {
err = errRunOverridden
}
}
case "yes":
if !r.Actions.IsConfirmable {
if r.Status == tfe.RunDiscarded {
err = errRunDiscarded
} else {
err = errRunApproved
}
}
}
if err != nil {
if b.CLI != nil {
b.CLI.Output(b.Colorize().Color(
fmt.Sprintf("[reset][yellow]%s[reset]", err.Error())))
}
if err == errRunDiscarded {
if op.Destroy {
err = errDestroyDiscarded
}
err = errApplyDiscarded
}
result <- err
return
}
}
}
}()
result <- func() error {
v, err := op.UIIn.Input(doneCtx, opts)
if err != nil && err != context.Canceled && stopCtx.Err() != context.Canceled {
return fmt.Errorf("Error asking %s: %v", opts.Id, err)
}
// We return the error of our parent channel as we don't
// care about the error of the doneCtx which is only used
// within this function. So if the doneCtx was canceled
// because stopCtx was canceled, this will properly return
// a context.Canceled error and otherwise it returns nil.
if doneCtx.Err() == context.Canceled || stopCtx.Err() == context.Canceled {
return stopCtx.Err()
}
// Make sure we cancel the context here so the loop that
// checks for external changes to the run is ended before
// we start to make changes ourselves.
cancel()
if v != keyword {
// Retrieve the run again to get its current status.
r, err = b.client.Runs.Read(stopCtx, r.ID)
if err != nil {
return generalError("Failed to retrieve run", err)
}
// Make sure we discard the run if possible.
if r.Actions.IsDiscardable {
err = b.client.Runs.Discard(stopCtx, r.ID, tfe.RunDiscardOptions{})
if err != nil {
if op.Destroy {
return generalError("Failed to discard destroy", err)
}
return generalError("Failed to discard apply", err)
}
}
// Even if the run was discarded successfully, we still
// return an error as the apply command was canceled.
if op.Destroy {
return errDestroyDiscarded
}
return errApplyDiscarded
}
return nil
}()
return <-result
}