X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/bea6f6d52db537bf2c0dbe826aedcddaa8de482c..566145652162e02433c1cd461bf9b5e312abbc40:/server/choose.c

diff --git a/server/choose.c b/server/choose.c
index fa424ee..06c9601 100644
--- a/server/choose.c
+++ b/server/choose.c
@@ -40,6 +40,7 @@
 #include <string.h>
 #include <fcntl.h>
 #include <syslog.h>
+#include <time.h>
 
 #include "configuration.h"
 #include "log.h"
@@ -51,6 +52,9 @@
 #include "trackdb.h"
 #include "trackdb-int.h"
 #include "version.h"
+#include "trackname.h"
+#include "queue.h"
+#include "server-queue.h"
 
 static DB_TXN *global_tid;
 
@@ -101,6 +105,19 @@ static unsigned long long total_weight;
 /** @brief Count of tracks */
 static long ntracks;
 
+static char **required_tags;
+static char **prohibited_tags;
+
+static int queue_contains(const struct queue_entry *head,
+                          const char *track) {
+  const struct queue_entry *q;
+
+  for(q = head->next; q != head; q = q->next)
+    if(!strcmp(q->track, track))
+      return 1;
+  return 0;
+}
+
 /** @brief Compute the weight of a track
  * @param track Track name (UTF-8)
  * @param data Track data
@@ -109,16 +126,63 @@ static long ntracks;
  *
  * Tracks to be excluded entirely are given a weight of 0.
  */
-static unsigned long compute_weight(const char attribute((unused)) *track,
-                                    struct kvp attribute((unused)) *data,
+static unsigned long compute_weight(const char *track,
+                                    struct kvp *data,
                                     struct kvp *prefs) {
   const char *s;
+  char **track_tags;
+  time_t last, now;
+
+  /* Reject tracks not in any collection (race between edit config and
+   * rescan) */
+  if(!find_track_root(track)) {
+    info("found track not in any collection: %s", track);
+    return 0;
+  }
 
-  /* Firstly, tracks with random play disabled always have weight 0 and that's
-   * that */
+  /* Reject aliases to avoid giving aliased tracks extra weight */
+  if(kvp_get(data, "_alias_for"))
+    return 0;
+  
+  /* Reject tracks with random play disabled */
   if((s = kvp_get(prefs, "pick_at_random"))
      && !strcmp(s, "0"))
     return 0;
+
+  /* Reject tracks played within the last 8 hours */
+  if((s = kvp_get(prefs, "played_time"))) {
+    last = atoll(s);
+    now = time(0);
+    if(now < last + config->replay_min)
+      return 0;
+  }
+
+  /* Reject tracks currently in the queue or in the recent list */
+  if(queue_contains(&qhead, track)
+     || queue_contains(&phead, track))
+    return 0;
+
+  /* We'll need tags for a number of things */
+  track_tags = parsetags(kvp_get(prefs, "tags"));
+
+  /* Reject tracks with prohibited tags */
+  if(prohibited_tags && tag_intersection(track_tags, prohibited_tags))
+    return 0;
+
+  /* Reject tracks that lack required tags */
+  if(*required_tags && !tag_intersection(track_tags, required_tags))
+    return 0;
+
+  /* Use the configured weight if available */
+  if((s = kvp_get(prefs, "weight"))) {
+    long n;
+    errno = 0;
+
+    n = strtol(s, 0, 10);
+    if((errno == 0 || errno == ERANGE) && n >= 0)
+      return n;
+  }
+  
   return 90000;
 }
 
@@ -128,11 +192,15 @@ static int collect_tracks_callback(const char *track,
                                    struct kvp *prefs,
 				   void attribute((unused)) *u,
 				   DB_TXN attribute((unused)) *tid) {
-  const unsigned long weight = compute_weight(track, data, prefs);
+  unsigned long weight = compute_weight(track, data, prefs);
 
   if(weight) {
     struct weighted_track *const t = xmalloc(sizeof *t);
 
+    /* Clamp weight so that we can fit in billions of tracks when we do
+     * arithmetic in long long */
+    if(weight > 0x7fffffff)
+      weight = 0x7fffffff;
     t->next = tracks;
     t->track = track;
     t->weight = weight;
@@ -177,7 +245,8 @@ static void pick_track(void) {
 }
 
 int main(int argc, char **argv) {
-  int n, logsyslog = !isatty(2);
+  int n, logsyslog = !isatty(2), err;
+  const char *tags;
   
   set_progname(argv);
   mem_init();
@@ -199,10 +268,19 @@ int main(int argc, char **argv) {
     log_default = &log_syslog;
   }
   if(config_read(0)) fatal(0, "cannot read configuration");
+  /* Find out current queue/recent list */
+  queue_read();
+  recent_read();
   /* Generate the candidate track list */
   trackdb_init(TRACKDB_NO_RECOVER);
   trackdb_open(TRACKDB_NO_UPGRADE|TRACKDB_READ_ONLY);
   global_tid = trackdb_begin_transaction();
+  if((err = trackdb_get_global_tid("required-tags", global_tid, &tags)))
+    fatal(0, "error getting required-tags: %s", db_strerror(err));
+  required_tags = parsetags(tags);
+  if((err = trackdb_get_global_tid("prohibited-tags", global_tid, &tags)))
+    fatal(0, "error getting prohibited-tags: %s", db_strerror(err));
+  prohibited_tags = parsetags(tags);
   if(trackdb_scan(0, collect_tracks_callback, 0, global_tid))
     exit(1);
   trackdb_commit_transaction(global_tid);