/
verify.go
130 lines (106 loc) · 3.38 KB
/
verify.go
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package pmtiles
import (
"bytes"
"context"
"fmt"
"github.com/RoaringBitmap/roaring/roaring64"
"io"
"log"
"math"
"time"
)
// Verify that an archive's header statistics are correct,
// and that tiles are propertly ordered if clustered=true.
func Verify(_ *log.Logger, file string) error {
start := time.Now()
ctx := context.Background()
bucketURL, key, err := NormalizeBucketKey("", "", file)
if err != nil {
return err
}
bucket, err := OpenBucket(ctx, bucketURL, "")
if err != nil {
return fmt.Errorf("Failed to open bucket for %s, %w", bucketURL, err)
}
defer bucket.Close()
r, err := bucket.NewRangeReader(ctx, key, 0, 16384)
if err != nil {
return fmt.Errorf("Failed to create range reader for %s, %w", key, err)
}
b, err := io.ReadAll(r)
if err != nil {
return fmt.Errorf("Failed to read %s, %w", key, err)
}
r.Close()
header, err := deserializeHeader(b[0:HeaderV3LenBytes])
var CollectEntries func(uint64, uint64, func(EntryV3))
CollectEntries = func(dir_offset uint64, dir_length uint64, f func(EntryV3)) {
dirbytes, err := bucket.NewRangeReader(ctx, key, int64(dir_offset), int64(dir_length))
if err != nil {
panic(fmt.Errorf("I/O error"))
}
defer dirbytes.Close()
b, err = io.ReadAll(dirbytes)
if err != nil {
panic(fmt.Errorf("I/O Error"))
}
directory := deserializeEntries(bytes.NewBuffer(b))
for _, entry := range directory {
if entry.RunLength > 0 {
f(entry)
} else {
CollectEntries(header.LeafDirectoryOffset+entry.Offset, uint64(entry.Length), f)
}
}
}
var minTileID uint64
var maxTileID uint64
minTileID = math.MaxUint64
maxTileID = 0
addressedTiles := 0
tileEntries := 0
offsets := roaring64.New()
var currentOffset uint64
CollectEntries(header.RootOffset, header.RootLength, func(e EntryV3) {
offsets.Add(e.Offset)
addressedTiles += int(e.RunLength)
tileEntries++
if e.TileID < minTileID {
minTileID = e.TileID
}
if e.TileID > maxTileID {
maxTileID = e.TileID
}
if e.Offset+uint64(e.Length) > header.TileDataLength {
fmt.Printf("Invalid: %v outside of tile data section", e)
}
if header.Clustered {
if !offsets.Contains(e.Offset) {
if e.Offset != currentOffset {
fmt.Printf("Invalid: out-of-order entry %v in clustered archive.", e)
}
currentOffset += uint64(e.Length)
}
}
})
if uint64(addressedTiles) != header.AddressedTilesCount {
fmt.Printf("Invalid: header AddressedTilesCount=%v but %v tiles addressed.", header.AddressedTilesCount, addressedTiles)
}
if uint64(tileEntries) != header.TileEntriesCount {
fmt.Printf("Invalid: header TileEntriesCount=%v but %v tile entries.", header.TileEntriesCount, tileEntries)
}
if offsets.GetCardinality() != header.TileContentsCount {
fmt.Printf("Invalid: header TileContentsCount=%v but %v tile contents.", header.TileContentsCount, offsets.GetCardinality())
}
if z, _, _ := IDToZxy(minTileID); z != header.MinZoom {
fmt.Printf("Invalid: header MinZoom=%v does not match min tile z %v", header.MinZoom, z)
}
if z, _, _ := IDToZxy(maxTileID); z != header.MaxZoom {
fmt.Printf("Invalid: header MaxZoom=%v does not match max tile z %v", header.MaxZoom, z)
}
if !(header.CenterZoom >= header.MinZoom && header.CenterZoom <= header.MaxZoom) {
fmt.Printf("Invalid: header CenterZoom=%v not within MinZoom/MaxZoom.", header.CenterZoom)
}
fmt.Printf("Completed verify in %v.\n", time.Since(start))
return nil
}