helpers.go

/*
Copyright 2021 Cortex Labs, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package enqueuer

import (
	"encoding/json"

	"github.com/aws/aws-sdk-go/service/s3"
	awslib "github.com/cortexlabs/cortex/pkg/lib/aws"
	"github.com/cortexlabs/cortex/pkg/lib/errors"
	"github.com/cortexlabs/cortex/pkg/lib/pointer"
	"github.com/gobwas/glob"
)

type jsonBuffer struct {
	BatchSize   int
	messageList []json.RawMessage
}

func newJSONBuffer(batchSize int) *jsonBuffer {
	return &jsonBuffer{
		BatchSize:   batchSize,
		messageList: make([]json.RawMessage, 0, batchSize),
	}
}

func (j *jsonBuffer) Add(jsonMessage json.RawMessage) {
	j.messageList = append(j.messageList, jsonMessage)
}

func (j *jsonBuffer) Clear() {
	j.messageList = make([]json.RawMessage, 0, j.BatchSize)
}

func (j *jsonBuffer) Length() int {
	return len(j.messageList)
}

func addJSONObjectsToQueue(uploader *sqsBatchUploader, jsonMessageList *jsonBuffer) error {
	jsonBytes, err := json.Marshal(jsonMessageList.messageList)
	if err != nil {
		return err
	}

	err = uploader.AddToBatch(randomMessageID(), pointer.String(string(jsonBytes)))
	if err != nil {
		return err
	}

	return nil
}

func s3IteratorFromLister(awsClient *awslib.Client, s3Lister S3Lister, fn func(string, *s3.Object) (bool, error)) (int64, error) {
	includeGlobPatterns := make([]glob.Glob, 0, len(s3Lister.Includes))

	for _, includePattern := range s3Lister.Includes {
		globExpression, err := glob.Compile(includePattern, '/')
		if err != nil {
			return 0, errors.Wrap(err, "failed to interpret glob pattern", includePattern)
		}
		includeGlobPatterns = append(includeGlobPatterns, globExpression)
	}

	excludeGlobPatterns := make([]glob.Glob, 0, len(s3Lister.Excludes))
	for _, excludePattern := range s3Lister.Excludes {
		globExpression, err := glob.Compile(excludePattern, '/')
		if err != nil {
			return 0, errors.Wrap(err, "failed to interpret glob pattern", excludePattern)
		}
		excludeGlobPatterns = append(excludeGlobPatterns, globExpression)
	}

	var numResults int64

	for _, s3Path := range s3Lister.S3Paths {
		bucket, key, err := awslib.SplitS3Path(s3Path)
		if err != nil {
			return 0, err
		}

		awsClientForBucket, err := awslib.NewFromClientS3Path(s3Path, awsClient)
		if err != nil {
			return 0, err
		}

		err = awsClientForBucket.S3Iterator(bucket, key, false, nil, nil, func(s3Obj *s3.Object) (bool, error) {
			s3FilePath := awslib.S3Path(bucket, *s3Obj.Key)

			shouldSkip := false
			if len(includeGlobPatterns) > 0 {
				shouldSkip = true
				for _, includeGlobPattern := range includeGlobPatterns {
					if includeGlobPattern.Match(s3FilePath) {
						shouldSkip = false
						break
					}
				}
			}

			for _, excludeGlobPattern := range excludeGlobPatterns {
				if excludeGlobPattern.Match(s3FilePath) {
					shouldSkip = true
					break
				}
			}

			if !shouldSkip {
				shouldContinue, err := fn(bucket, s3Obj)
				numResults++
				if s3Lister.MaxResults != nil && numResults >= *s3Lister.MaxResults {
					shouldContinue = false
				}
				return shouldContinue, err
			}

			return true, nil
		})
		if err != nil {
			return 0, err
		}

		if s3Lister.MaxResults != nil && numResults >= *s3Lister.MaxResults {
			return numResults, nil
		}
	}

	return numResults, nil
}