/
createDateFilter.go
256 lines (219 loc) · 6.89 KB
/
createDateFilter.go
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// COPYRIGHT_BEGIN
// Copyright 2020 Alticast 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.
// COPYRIGHT_END
// Declare package.
package main
// Declare imported packages.
import (
"errors"
"log"
"time"
"github.com/gocql/gocql"
)
// createLogTimestampQuery will create a Cassandra query that returns all entries
// that are equal to "createDate". If "createDate" is zero, then all entries in the
// table will be returned.
func createLogTimestampQuery(createDate time.Time) (string, error) {
var query string
var parts []string
parts = make([]string, 0)
parts = append(parts, "SELECT time_id, create_date FROM \"LogTimestamp\"")
if !createDate.IsZero() {
createDateStr := createDate.Format(time.RFC3339)
parts = append(parts, " Where create_date = '")
parts = append(parts, createDateStr+"'")
}
parts = append(parts, " ALLOW FILTERING")
for _, value := range parts {
query = query + value
}
return query, nil
}
func createLogTimestampRangeQuery(lowerBound time.Time, upperBound time.Time) (string, error) {
var query string
var parts []string
var lowerSpecified bool = false
parts = make([]string, 0)
parts = append(parts, "SELECT time_id, create_date FROM \"LogTimestamp\"")
if !lowerBound.IsZero() {
createDateStr := lowerBound.Format(time.RFC3339)
parts = append(parts, " WHERE create_date >= '")
parts = append(parts, createDateStr+"'")
lowerSpecified = true
}
if !upperBound.IsZero() {
createDateStr := upperBound.Format(time.RFC3339)
if lowerSpecified {
parts = append(parts, " AND create_date <= '")
parts = append(parts, createDateStr+"'")
} else {
parts = append(parts, " WHERE create_date <= '")
parts = append(parts, createDateStr+"'")
}
}
parts = append(parts, " ALLOW FILTERING")
for _, value := range parts {
query = query + value
}
return query, nil
}
func createLogTimestampQueryForUUID(uuid gocql.UUID) (string, error) {
var query string
var parts []string
parts = make([]string, 0)
parts = append(parts, "SELECT time_id, create_date FROM \"LogTimestamp\"")
parts = append(parts, " WHERE time_id = ")
parts = append(parts, uuid.String())
parts = append(parts, " ALLOW FILTERING")
for _, value := range parts {
query = query + value
}
return query, nil
}
func filterContainsCreateDateOnly(filter *LogFilter) bool {
if filter == nil {
err := errors.New("invalid input argument")
log.Println("[LOGSERVER-Error] Invalid log filter:", err, ".")
return false
}
if (filter.FileName == "") && (filter.Owner == "") && (filter.SizeLower < 0) && (filter.SizeUpper < 0) &&
(!filter.CreateDateLower.IsZero()) && (!filter.CreateDateUpper.IsZero()) {
return true
}
return false
}
func filterContainsCreateDateRangeOnly(filter *LogFilter) bool {
if filter == nil {
err := errors.New("invalid input argument")
log.Println("[LOGSERVER-Error] Invalid log filter:", err, ".")
return false
}
if (filter.FileName == "") && (filter.Owner == "") && ((filter.SizeLower < 0) || (filter.SizeUpper < 0)) &&
((!filter.CreateDateLower.IsZero()) || (!filter.CreateDateUpper.IsZero())) {
return true
}
return false
}
func validDateRange(lowerBound time.Time, upperBound time.Time) bool {
if (!lowerBound.IsZero()) && (upperBound.IsZero()) {
// Special case: only the lower bound is being specified.
return true
}
if (lowerBound.IsZero()) && (!upperBound.IsZero()) {
// Special case: only the upper bound is being specified.
return true
}
if (lowerBound.IsZero()) && (upperBound.IsZero()) {
return false
}
if (upperBound.Before(lowerBound)) || (lowerBound.After(upperBound)) {
return false
}
return true
}
func processCreateDateQuery(session *gocql.Session, lowerBound time.Time, upperBound time.Time) ([]LogEntry, error) {
if !validDateRange(lowerBound, upperBound) {
err := errors.New("invalid input argument")
log.Println("[LOGSERVER-Error] Unable to process create_date query:", err, ".")
return nil, err
}
// Retrieve a log entry.
var values []LogEntry
var id gocql.UUID
var fileName string
var fileSize int64
var owner string
var contact string
var description string
var location string
var createDate time.Time
// Retrieve values for timestamp meta-data.
var query string
if lowerBound.Equal(upperBound) {
query, _ = createLogTimestampQuery(lowerBound)
} else {
query, _ = createLogTimestampRangeQuery(lowerBound, upperBound)
}
log.Println("[LOGSERVER-Info] query:", query)
iter := session.Query(query).Iter()
for iter.Scan(&id, &createDate) {
// Populate the return value.
var entry LogEntry
entry.TimeID = id
entry.CreateDate = createDate
values = append(values, entry)
}
if err := iter.Close(); err != nil {
log.Println("[LOGSERVER-Error]", err)
return nil, err
}
for i, next := range values {
// Find matching log entry data.
query, _ = createLogEntryQueryForUUID(next.TimeID)
log.Println("[LOGSERVER-Info] query:", query)
iter = session.Query(query).Iter()
if iter.NumRows() == 0 {
// No matching uuid was found.
err := errors.New("currupt LogEntry table")
return nil, err
}
// There should only be one unique size entry found.
for iter.Scan(&id, &fileName, &contact, &description, &location) {
values[i].FileName = fileName
values[i].Contact = contact
values[i].Description = description
values[i].Location = location
}
if err := iter.Close(); err != nil {
log.Println("[LOGSERVER-Error]", err)
return nil, err
}
// Find matching size data.
query, _ = createLogSizeQueryForUUID(next.TimeID)
log.Println("[LOGSERVER-Info] query:", query)
iter = session.Query(query).Iter()
if iter.NumRows() == 0 {
// No matching uuid was found.
err := errors.New("currupt LogSize table")
return nil, err
}
// There should only be one unique size entry found.
for iter.Scan(&id, &fileSize) {
values[i].Size = fileSize
}
if err := iter.Close(); err != nil {
log.Println("[LOGSERVER-Error]", err)
return nil, err
}
// Find matching owner data.
query, _ = createLogOwnerQueryForUUID(next.TimeID)
log.Println("[LOGSERVER-Info] query:", query)
iter = session.Query(query).Iter()
if iter.NumRows() == 0 {
// No matching uuid was found.
err := errors.New("currupt LogOwner table")
return nil, err
}
// There should only be one unique size entry found.
for iter.Scan(&id, &owner) {
values[i].Owner = owner
}
if err := iter.Close(); err != nil {
log.Println("[LOGSERVER-Error]", err)
return nil, err
}
}
return values, nil
}