mirror of https://github.com/pulumi/pulumi.git
131 lines
3.6 KiB
Go
131 lines
3.6 KiB
Go
// Copyright 2016-2022, Pulumi Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package httpstate
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import (
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"bytes"
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"context"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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opentracing "github.com/opentracing/opentracing-go"
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"github.com/pulumi/pulumi/sdk/v3/go/common/promise"
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)
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type deploymentDiffState struct {
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lastSavedDeployment deployment
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sequenceNumber int
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minimalDiffSize int
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buffer *bytes.Buffer
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}
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type deploymentDiff struct {
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sequenceNumber int
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checkpointHash string
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deploymentDelta json.RawMessage
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}
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func newDeploymentDiffState(minimalDiffSize int) *deploymentDiffState {
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return &deploymentDiffState{
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sequenceNumber: 1,
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minimalDiffSize: minimalDiffSize,
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}
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}
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func (dds *deploymentDiffState) SequenceNumber() int {
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return dds.sequenceNumber
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}
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func (dds *deploymentDiffState) CanDiff() bool {
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return dds.lastSavedDeployment.raw != nil
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}
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// Size-based heuristics trying to estimate if the diff method will be
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// worth it and take less time than sending the entire deployment.
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func (dds *deploymentDiffState) ShouldDiff(new deployment) bool {
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if !dds.CanDiff() {
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return false
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}
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if len(dds.lastSavedDeployment.raw) < dds.minimalDiffSize {
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return false
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}
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if len(new.raw) < dds.minimalDiffSize {
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return false
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}
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return true
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}
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func (dds *deploymentDiffState) Diff(ctx context.Context, deployment deployment) (deploymentDiff, error) {
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if !dds.CanDiff() {
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return deploymentDiff{}, errors.New("Diff() cannot be called before Saved()")
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}
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tracingSpan, childCtx := opentracing.StartSpanFromContext(ctx, "Diff")
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defer tracingSpan.Finish()
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before := dds.lastSavedDeployment.raw
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after := deployment.raw
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checkpointHashPromise := promise.Run(func() (string, error) {
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return dds.computeHash(childCtx, after), nil
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})
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delta, err := dds.computeEdits(childCtx, dds.lastSavedDeployment, deployment)
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if err != nil {
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return deploymentDiff{}, fmt.Errorf("Cannot marshal the edits: %w", err)
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}
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checkpointHash, err := checkpointHashPromise.Result(ctx)
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if err != nil {
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return deploymentDiff{}, fmt.Errorf("Cannot compute the checkpoint hash: %w", err)
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}
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tracingSpan.SetTag("before", len(before))
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tracingSpan.SetTag("after", len(after))
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tracingSpan.SetTag("diff", len(delta))
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tracingSpan.SetTag("compression", 100.0*float64(len(delta))/float64(len(after)))
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tracingSpan.SetTag("hash", checkpointHash)
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diff := deploymentDiff{
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checkpointHash: checkpointHash,
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deploymentDelta: delta,
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sequenceNumber: dds.sequenceNumber,
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}
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return diff, nil
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}
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// Indicates that a deployment was just saved to the service.
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func (dds *deploymentDiffState) Saved(ctx context.Context, deployment deployment) error {
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if dds.lastSavedDeployment.buf != nil {
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dds.buffer = dds.lastSavedDeployment.buf
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dds.buffer.Reset()
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}
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dds.lastSavedDeployment = deployment
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dds.sequenceNumber++
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return nil
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}
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func (*deploymentDiffState) computeHash(ctx context.Context, deployment json.RawMessage) string {
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tracingSpan, _ := opentracing.StartSpanFromContext(ctx, "computeHash")
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defer tracingSpan.Finish()
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hash := sha256.Sum256(deployment)
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return hex.EncodeToString(hash[:])
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}
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