--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/dbfs.c	Sun Oct 12 14:57:06 2008 +0300
@@ -0,0 +1,223 @@
+
+/*
+ * A simple PostgreSQL-based filesystem.
+ */
+
+#include <string.h>
+#include <errno.h>
+
+#include <event2/event.h>
+
+#include "evfuse.h"
+#include "evsql.h"
+#include "dirbuf.h"
+#include "lib/log.h"
+#include "lib/signals.h"
+#include "lib/misc.h"
+
+#define SERROR(val) do { (val); goto error; } while(0)
+
+struct dbfs {
+    struct event_base *ev_base;
+    struct signals *signals;
+    
+    const char *db_conninfo;
+    struct evsql *db;
+
+    struct evfuse *ev_fuse;
+};
+
+#define CONNINFO_DEFAULT "dbname=test"
+
+// XXX: not sure how this should work
+#define CACHE_TIMEOUT 1.0
+
+mode_t _dbfs_mode (const char *type) {
+    if (!strcmp(type, "DIR"))
+        return S_IFDIR;
+
+    if (!strcmp(type, "REG"))
+        return S_IFREG;
+
+    else {
+        WARNING("[dbfs] weird mode-type: %s", type);
+        return 0;
+    }
+}
+
+void dbfs_init (void *userdata, struct fuse_conn_info *conn) {
+    INFO("[dbfs.init] userdata=%p, conn=%p", userdata, conn);
+
+}
+
+void dbfs_destroy (void *userdata) {
+    INFO("[dbfs.destroy] userdata=%p", userdata);
+
+
+}
+
+void _dbfs_lookup_result (const struct evsql_result_info *res, void *arg) {
+    struct fuse_req *req = arg;
+    struct fuse_entry_param e; ZINIT(e);
+    int err = 0;
+    
+    uint16_t mode;
+    uint32_t ino;
+    uint64_t size, nlink;
+    const char *type;
+    
+    // check if it failed
+    if (res->error && (err = EIO))
+        NERROR(evsql_result_error(res));
+
+    // duplicate rows?
+    if (evsql_result_rows(res) > 1)
+        EERROR(err = EIO, "multiple rows returned");
+
+    // not found?
+    if (evsql_result_rows(res) == 0)
+        SERROR(err = ENOENT);
+    
+    // correct number of columns
+    if (evsql_result_cols(res) != 5)
+        EERROR(err = EIO, "wrong number of columns: %zu", evsql_result_cols(res));
+    
+    // get the data
+    if (0
+        ||  evsql_result_uint32(res, 0, 0, &ino,        0 ) // inodes.ino
+        ||  evsql_result_string(res, 0, 1, &type,       0 ) // inodes.type
+        ||  evsql_result_uint16(res, 0, 2, &mode,       0 ) // inodes.mode
+        ||  evsql_result_uint64(res, 0, 3, &size,       0 ) // inodes.size
+        ||  evsql_result_uint64(res, 0, 4, &nlink,      0 ) // count(*)
+    )
+        EERROR(err = EIO, "invalid db data");
+    
+    INFO("[dbfs.look] -> ino=%u, st_mode=S_IF%s | %ho, st_nlink=%llu, st_size=%llu", ino, type, mode, (long long unsigned int) nlink, (long long unsigned int) size);
+
+    // convert and store
+    e.ino = e.attr.st_ino = ino;
+    e.attr.st_mode = _dbfs_mode(type) | mode;
+    e.attr.st_nlink = nlink;
+    e.attr.st_size = size;
+    
+    // XXX: timeouts
+    e.attr_timeout = CACHE_TIMEOUT;
+    e.entry_timeout = CACHE_TIMEOUT;
+        
+    // reply
+    if ((err = fuse_reply_entry(req, &e)))
+        EERROR(err, "fuse_reply_entry");
+
+error:
+    if (err && (err = fuse_reply_err(req, err)))
+        EWARNING(err, "fuse_reply_err");
+
+    // free
+    evsql_result_free(res);
+}
+
+void dbfs_lookup (struct fuse_req *req, fuse_ino_t parent, const char *name) {
+    struct dbfs *ctx = fuse_req_userdata(req);
+    int err;
+
+    INFO("[dbfs.lookup] parent=%lu name=%s", parent, name);
+    
+    // query and params
+    const char *sql = 
+        "SELECT"
+        " inodes.ino, inodes.type, inodes.mode, inodes.size, count(*)"
+        " FROM file_tree INNER JOIN inodes ON (file_tree.inode = inodes.ino)"
+        " WHERE file_tree.parent = $1::int AND file_tree.name = $2::varchar"
+        " GROUP BY inodes.ino, inodes.type, inodes.mode, inodes.size";
+    
+    static struct evsql_query_params params = EVSQL_PARAMS(EVSQL_FMT_BINARY) {
+        EVSQL_PARAM ( UINT32 ),
+        EVSQL_PARAM ( STRING ),
+
+        EVSQL_PARAMS_END
+    };
+    
+    // build params
+    if (0
+        ||  evsql_param_uint32(&params, 0, parent)
+        ||  evsql_param_string(&params, 1, name)
+    )
+        EERROR(err = EIO, "evsql_param_*");
+
+    // query
+    if (evsql_query_params(ctx->db, sql, &params, _dbfs_lookup_result, req) == NULL)
+        EERROR(err = EIO, "evsql_query_params");
+
+    // XXX: handle interrupts
+    
+    // wait
+    return;
+
+error:
+    if ((err = fuse_reply_err(req, err)))
+        EWARNING(err, "fuse_reply_err");
+}
+
+struct fuse_lowlevel_ops dbfs_llops = {
+    .init           = dbfs_init,
+    .destroy        = dbfs_destroy,
+    
+    .lookup         = dbfs_lookup,
+};
+
+void dbfs_sql_error (struct evsql *evsql, void *arg) {
+    struct dbfs *ctx = arg;
+
+    // AAAAAAAAAA.... panic
+    WARNING("[dbfs] SQL error: BREAKING MAIN LOOP LIEK NAO");
+
+    event_base_loopbreak(ctx->ev_base);
+}
+
+int main (int argc, char **argv) {
+    struct fuse_args fuse_args = FUSE_ARGS_INIT(argc, argv);
+    struct dbfs ctx; ZINIT(ctx);
+    
+    // parse args, XXX: fuse_args
+    ctx.db_conninfo = CONNINFO_DEFAULT;
+    
+    // init libevent
+    if ((ctx.ev_base = event_base_new()) == NULL)
+        ERROR("event_base_new");
+    
+    // setup signals
+    if ((ctx.signals = signals_default(ctx.ev_base)) == NULL)
+        ERROR("signals_default");
+
+    // open sql
+    if ((ctx.db = evsql_new_pq(ctx.ev_base, ctx.db_conninfo, dbfs_sql_error, &ctx)) == NULL)
+        ERROR("evsql_new_pq");
+
+    // open fuse
+    if ((ctx.ev_fuse = evfuse_new(ctx.ev_base, &fuse_args, &dbfs_llops, &ctx)) == NULL)
+        ERROR("evfuse_new");
+
+    // run libevent
+    INFO("running libevent loop");
+
+    if (event_base_dispatch(ctx.ev_base))
+        PERROR("event_base_dispatch");
+    
+    // clean shutdown
+
+error :
+    // cleanup
+    if (ctx.ev_fuse)
+        evfuse_close(ctx.ev_fuse);
+
+    // XXX: ctx.db
+    
+    if (ctx.signals)
+        signals_free(ctx.signals);
+
+    if (ctx.ev_base)
+        event_base_free(ctx.ev_base);
+    
+    fuse_opt_free_args(&fuse_args);
+}
+