tilelib.go

   1 package main
   2
   3 import (
   4         "bufio"
   5         "bytes"
   6         "io"
   7         "log"
   8         "strings"
   9         "sync"
  10
  11         "golang.org/x/crypto/blake2b"
  12 )
  13
  14 type tileVariantID uint16 // 1-based
  15
  16 type tileLibRef struct {
  17         tag     tagID
  18         variant tileVariantID
  19 }
  20
  21 type tileSeq map[string][]tileLibRef
  22
  23 func (tseq tileSeq) Variants() []tileVariantID {
  24         maxtag := 0
  25         for _, refs := range tseq {
  26                 for _, ref := range refs {
  27                         if maxtag < int(ref.tag) {
  28                                 maxtag = int(ref.tag)
  29                         }
  30                 }
  31         }
  32         vars := make([]tileVariantID, maxtag+1)
  33         for _, refs := range tseq {
  34                 for _, ref := range refs {
  35                         vars[int(ref.tag)] = ref.variant
  36                 }
  37         }
  38         return vars
  39 }
  40
  41 type tileLibrary struct {
  42         taglib  *tagLibrary
  43         variant [][][blake2b.Size256]byte
  44         // count [][]int
  45         // seq map[[blake2b.Size]byte][]byte
  46         variants int
  47
  48         mtx sync.Mutex
  49 }
  50
  51 func (tilelib *tileLibrary) TileFasta(filelabel string, rdr io.Reader) (tileSeq, error) {
  52         ret := tileSeq{}
  53         type jobT struct {
  54                 label string
  55                 fasta []byte
  56         }
  57         todo := make(chan jobT)
  58         scanner := bufio.NewScanner(rdr)
  59         go func() {
  60                 defer close(todo)
  61                 var fasta []byte
  62                 var seqlabel string
  63                 for scanner.Scan() {
  64                         buf := scanner.Bytes()
  65                         if len(buf) == 0 || buf[0] == '>' {
  66                                 todo <- jobT{seqlabel, fasta}
  67                                 seqlabel, fasta = string(buf[1:]), nil
  68                                 log.Printf("%s %s reading fasta", filelabel, seqlabel)
  69                         } else {
  70                                 fasta = append(fasta, bytes.ToLower(buf)...)
  71                         }
  72                 }
  73                 todo <- jobT{seqlabel, fasta}
  74         }()
  75         path := make([]tileLibRef, 2000000)
  76         for job := range todo {
  77                 if len(job.fasta) == 0 || strings.Contains(job.label, "_") {
  78                         continue
  79                 }
  80                 log.Printf("%s %s tiling", filelabel, job.label)
  81                 path = path[:0]
  82                 tilestart := -1        // position in fasta of tile that ends here
  83                 tiletagid := tagID(-1) // tag id starting tile that ends here
  84                 tilelib.taglib.FindAll(job.fasta, func(id tagID, pos, taglen int) {
  85                         if tilestart >= 0 {
  86                                 path = append(path, tilelib.getRef(tiletagid, job.fasta[tilestart:pos+taglen]))
  87                         }
  88                         tilestart = pos
  89                         tiletagid = id
  90                 })
  91                 if tiletagid >= 0 {
  92                         path = append(path, tilelib.getRef(tiletagid, job.fasta[tilestart:]))
  93                 }
  94                 pathcopy := make([]tileLibRef, len(path))
  95                 copy(pathcopy, path)
  96                 ret[job.label] = pathcopy
  97                 log.Printf("%s %s tiled with path len %d", filelabel, job.label, len(path))
  98         }
  99         return ret, scanner.Err()
 100 }
 101
 102 func (tilelib *tileLibrary) Len() int {
 103         tilelib.mtx.Lock()
 104         defer tilelib.mtx.Unlock()
 105         return tilelib.variants
 106 }
 107
 108 // Return a tileLibRef for a tile with the given tag and sequence,
 109 // adding the sequence to the library if needed.
 110 func (tilelib *tileLibrary) getRef(tag tagID, seq []byte) tileLibRef {
 111         for _, b := range seq {
 112                 if b != 'a' && b != 'c' && b != 'g' && b != 't' {
 113                         // return "tile not found" if seq has any
 114                         // no-calls
 115                         return tileLibRef{tag: tag}
 116                 }
 117         }
 118         tilelib.mtx.Lock()
 119         defer tilelib.mtx.Unlock()
 120         // if tilelib.seq == nil {
 121         //      tilelib.seq = map[[blake2b.Size]byte][]byte{}
 122         // }
 123         if tilelib.variant == nil {
 124                 tilelib.variant = make([][][blake2b.Size256]byte, tilelib.taglib.Len())
 125         }
 126         seqhash := blake2b.Sum256(seq)
 127         for i, varhash := range tilelib.variant[tag] {
 128                 if varhash == seqhash {
 129                         return tileLibRef{tag: tag, variant: tileVariantID(i + 1)}
 130                 }
 131         }
 132         tilelib.variants++
 133         tilelib.variant[tag] = append(tilelib.variant[tag], seqhash)
 134         // tilelib.seq[seqhash] = append([]byte(nil), seq...)
 135         return tileLibRef{tag: tag, variant: tileVariantID(len(tilelib.variant[tag]))}
 136 }