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Overview
Comment:Add a reference count field to the emailblob table and triggers to keep the reference count current and to drop entries when the reference count reaches zero.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | webmail
Files: files | file ages | folders
SHA3-256:94da0fb27c3969f610f21830e328587b395adc3265289e8ca06eeebad6cf9b3f
User & Date: drh 2018-07-17 13:54:59
Context
2018-07-17
14:47
Add the test-emailblob page. check-in: 8ac5bbbd user: drh tags: webmail
13:54
Add a reference count field to the emailblob table and triggers to keep the reference count current and to drop entries when the reference count reaches zero. check-in: 94da0fb2 user: drh tags: webmail
2018-07-16
11:35
Merge enhancements from trunk. check-in: 03a9b6f8 user: drh tags: webmail
Changes
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Changes to src/db.c.

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}

/*
** Silently add the filename and line number as parameter to each
** db_begin_transaction call.
*/
#if INTERFACE
#define db_begin_transaction() db_begin_transaction_real(__FILE__,__LINE__)



#endif

/*
** Begin and end a nested transaction
*/
void db_begin_transaction_real(const char *zStartFile, int iStartLine){
  if( db.nBegin==0 ){
    db_multi_exec("BEGIN");
    sqlite3_commit_hook(g.db, db_verify_at_commit, 0);
    db.nPriorChanges = sqlite3_total_changes(g.db);
    db.doRollback = 0;
    db.zStartFile = zStartFile;
    db.iStartLine = iStartLine;
  }
  db.nBegin++;
}






















void db_end_transaction(int rollbackFlag){
  if( g.db==0 ) return;
  if( db.nBegin<=0 ){
    fossil_warning("Extra call to db_end_transaction");
    return;
  }
  if( rollbackFlag ){







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}

/*
** Silently add the filename and line number as parameter to each
** db_begin_transaction call.
*/
#if INTERFACE
#define db_begin_transaction()    db_begin_transaction_real(__FILE__,__LINE__)
#define db_begin_write()          db_begin_write_real(__FILE__,__LINE__)
#define db_commit_transaction()   db_end_transaction(0)
#define db_rollback_transaction() db_end_transaction(1)
#endif

/*
** Begin a nested transaction
*/
void db_begin_transaction_real(const char *zStartFile, int iStartLine){
  if( db.nBegin==0 ){
    db_multi_exec("BEGIN");
    sqlite3_commit_hook(g.db, db_verify_at_commit, 0);
    db.nPriorChanges = sqlite3_total_changes(g.db);
    db.doRollback = 0;
    db.zStartFile = zStartFile;
    db.iStartLine = iStartLine;
  }
  db.nBegin++;
}
/*
** Begin a new transaction for writing.
*/
void db_begin_write_real(const char *zStartFile, int iStartLine){
  if( db.nBegin==0 ){
    db_multi_exec("BEGIN IMMEDIATE");
    sqlite3_commit_hook(g.db, db_verify_at_commit, 0);
    db.nPriorChanges = sqlite3_total_changes(g.db);
    db.doRollback = 0;
    db.zStartFile = zStartFile;
    db.iStartLine = iStartLine;
  }else{
    fossil_warning("read txn at %s:%d might cause SQLITE_BUSY "
       "for the write txn at %s:%d",
       db.zStartFile, db.iStartLine, zStartFile, iStartLine);
  }
  db.nBegin++;
}

/* End a transaction previously started using db_begin_transaction()
** or db_begin_write().
*/
void db_end_transaction(int rollbackFlag){
  if( g.db==0 ) return;
  if( db.nBegin<=0 ){
    fossil_warning("Extra call to db_end_transaction");
    return;
  }
  if( rollbackFlag ){

Changes to src/email.c.

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  int iJulianDay;
  if( g.db==0 ) return;
  if( db_transaction_nesting_depth()!=0 ){
    fossil_warning("Called email_auto_exec() from within transaction "
                   "started at %z", db_transaction_start_point());
    return;
  }
  db_begin_transaction();
  if( !email_tables_exist() ) goto autoexec_done;
  if( !db_get_boolean("email-autoexec",0) ) goto autoexec_done;
  email_send_alerts(0);
  iJulianDay = db_int(0, "SELECT julianday('now')");
  if( iJulianDay>db_get_int("email-last-digest",0) ){
    if( db_transaction_nesting_depth()!=1 ){
      fossil_warning("Transaction nesting error prior to digest processing");
    }else{
      db_set_int("email-last-digest",iJulianDay,0);
      email_send_alerts(SENDALERT_DIGEST);
    }
  }

autoexec_done:
  db_end_transaction(0);
}

/*
** WEBPAGE: contact_admin
**
** A web-form to send an email message to the repository administrator,
** or (with appropriate permissions) to anybody.







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  int iJulianDay;
  if( g.db==0 ) return;
  if( db_transaction_nesting_depth()!=0 ){
    fossil_warning("Called email_auto_exec() from within transaction "
                   "started at %z", db_transaction_start_point());
    return;
  }
  if( !email_tables_exist() ) return;
  if( !db_get_boolean("email-autoexec",0) ) return;
  db_begin_write();
  email_send_alerts(0);
  iJulianDay = db_int(0, "SELECT julianday('now')");
  if( iJulianDay>db_get_int("email-last-digest",0) ){
    if( db_transaction_nesting_depth()!=1 ){
      fossil_warning("Transaction nesting error prior to digest processing");
    }else{
      db_set_int("email-last-digest",iJulianDay,0);
      email_send_alerts(SENDALERT_DIGEST);
    }
  }


  db_commit_transaction();
}

/*
** WEBPAGE: contact_admin
**
** A web-form to send an email message to the repository administrator,
** or (with appropriate permissions) to anybody.

Changes to src/smtp.c.

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** Schema used by the email processing system.
*/
static const char zEmailSchema[] = 
@ -- bulk storage is in a separate table.  This table can store either
@ -- the body of email messages or transcripts of smtp sessions.
@ CREATE TABLE IF NOT EXISTS repository.emailblob(
@   emailid INTEGER PRIMARY KEY,  -- numeric idea for the entry

@   ets INT,                      -- Corresponding transcript, or NULL
@   etime INT,                    -- insertion time, secs since 1970
@   etxt TEXT                     -- content of this entry
@ );
@
@ -- One row for each mailbox entry.  All users emails are stored in
@ -- this same table.
@ CREATE TABLE IF NOT EXISTS repository.emailbox(
@   ebid INTEGER PRIMARY KEY,  -- Unique id for each mailbox entry
@   euser TEXT,          -- User who received this email
@   edate INT,           -- Date received.  Seconds since 1970
@   efrom TEXT,          -- Who is the email from
@   emsgid INT,          -- Raw email text
@   ets INT,             -- Transcript of the receiving SMTP session
@   estate INT,          -- 0: Unread, 1: read, 2: trash 3: sent
@   esubject TEXT,       -- Subject line for display
@   etags TEXT           -- zero or more tags
@ );
@
@ -- Information on how to deliver incoming email.
@ CREATE TABLE IF NOT EXISTS repository.emailroute(
................................................................................
@   eto TEXT,                -- Receipient email address
@   emsgid INT,              -- Message body in the emailblob table
@   ectime INT,              -- Time enqueued.  Seconds since 1970
@   emtime INT,              -- Time of last send attempt.  Sec since 1970
@   ensend INT,              -- Number of send attempts
@   ets INT                  -- Transcript of last failed attempt
@ );



















;

/*
** Code used to delete the email tables.
*/
static const char zEmailDrop[] =
@ DROP TABLE IF EXISTS emailblob;
................................................................................
  char *zFrom;                /* MAIL FROM: argument */
  int nTo;                    /* Number of RCPT TO: lines seen */
  struct SmtpTo {
    char *z;                    /* Address in each RCPT TO line */
    int okRemote;               /* zTo can be in another domain */
  } *aTo;
  u32 srvrFlags;              /* Control flags */


  Blob msg;                   /* Content following DATA */
  Blob transcript;            /* Session transcript */
};

#define SMTPSRV_CLEAR_MSG    1   /* smtp_server_clear() last message only */
#define SMTPSRV_CLEAR_ALL    2   /* smtp_server_clear() everything */
#define SMTPSRV_LOG       0x001  /* Record a transcript of the interaction */
................................................................................
      if( zAddr[i]=='@' && zAddr[i+1]!=0 ){
        db_multi_exec(
          "INSERT INTO emailoutq(edomain,efrom,eto,emsgid,ectime,"
                                "emtime,ensend)"
          "VALUES(%Q,%Q,%Q,%lld,now(),0,0)",
          zAddr+i+1, p->zFrom, zAddr, p->idMsg
        );

      }
    }
    return;
  }
  blob_init(&policy, zPolicy, -1);
  while( blob_line(&policy, &line) ){
    blob_trim(&line);
................................................................................
    blob_token(&line, &token);
    blob_tail(&line, &tail);
    if( blob_size(&tail)==0 ) continue;
    if( blob_eq_str(&token, "mbox", 4) ){
      Blob subj;
      email_header_value(&p->msg, "subject", &subj);
      db_multi_exec(
        "INSERT INTO emailbox(euser,edate,efrom,emsgid,ets,estate,esubject)"
        " VALUES(%Q,now(),%Q,%lld,%lld,0,%Q)",
          blob_str(&tail), p->zFrom, p->idMsg, p->idTranscript,
          blob_str(&subj)
      );
      blob_reset(&subj);

    }
    if( blob_eq_str(&token, "forward", 7) ){
      smtp_append_to(p, fossil_strdup(blob_str(&tail)), 1);
    }
    blob_reset(&tail);
  }
}
................................................................................
  Stmt s;
  int i;
  if( p->zFrom
   && p->nTo
   && blob_size(&p->msg)
   && (p->srvrFlags & SMTPSRV_DRYRUN)==0
  ){
    db_begin_transaction();
    if( p->idTranscript==0 ) smtp_server_schema(0);

    db_prepare(&s,
      "INSERT INTO emailblob(ets,etime,etxt)"
      " VALUES(:ets,now(),compress(:etxt))"
    );

    if( !bFinish && p->idTranscript==0 ){
      db_bind_null(&s, ":ets");
      db_bind_null(&s, ":etxt");

      db_step(&s);
      db_reset(&s);
      p->idTranscript = db_last_insert_rowid();
    }else if( bFinish ){
      if( p->idTranscript ){
        db_multi_exec(
           "UPDATE emailblob SET etxt=compress(%Q)"
           " WHERE emailid=%lld",
           blob_str(&p->transcript), p->idTranscript);
      }else{
        db_bind_null(&s, ":ets");
        db_bind_str(&s, ":etxt", &p->transcript);

        db_step(&s);
        db_reset(&s);
        p->idTranscript = db_last_insert_rowid();
      }
    }
    db_bind_int64(&s, ":ets", p->idTranscript);
    db_bind_str(&s, ":etxt", &p->msg);

    db_step(&s);
    db_finalize(&s);
    p->idMsg = db_last_insert_rowid();

    /* make entries in emailbox and emailoutq */
    for(i=0; i<p->nTo; i++){
      int okRemote = p->aTo[i].okRemote;
      p->aTo[i].okRemote = 1;
      smtp_server_send_one_user(p, p->aTo[i].z, okRemote);
    }













    /* Finish the transaction after all changes are implemented */
    db_end_transaction(0);
  }
  smtp_server_clear(p, SMTPSRV_CLEAR_MSG);
}

































































/*
** COMMAND: smtpd
**
** Usage: %fossil smtpd [OPTIONS] REPOSITORY
**
** Begin a SMTP conversation with a client using stdin/stdout.  The







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** Schema used by the email processing system.
*/
static const char zEmailSchema[] = 
@ -- bulk storage is in a separate table.  This table can store either
@ -- the body of email messages or transcripts of smtp sessions.
@ CREATE TABLE IF NOT EXISTS repository.emailblob(
@   emailid INTEGER PRIMARY KEY,  -- numeric idea for the entry
@   enref INT,                    -- Number of references to this blob
@   ets INT,                      -- Corresponding transcript, or NULL
@   etime INT,                    -- insertion time, secs since 1970
@   etxt TEXT                     -- content of this entry
@ );
@
@ -- One row for each mailbox entry.  All users emails are stored in
@ -- this same table.
@ CREATE TABLE IF NOT EXISTS repository.emailbox(
@   ebid INTEGER PRIMARY KEY,  -- Unique id for each mailbox entry
@   euser TEXT,          -- User who received this email
@   edate INT,           -- Date received.  Seconds since 1970
@   efrom TEXT,          -- Who is the email from
@   emsgid INT,          -- Raw email text

@   estate INT,          -- 0: Unread, 1: read, 2: trash 3: sent
@   esubject TEXT,       -- Subject line for display
@   etags TEXT           -- zero or more tags
@ );
@
@ -- Information on how to deliver incoming email.
@ CREATE TABLE IF NOT EXISTS repository.emailroute(
................................................................................
@   eto TEXT,                -- Receipient email address
@   emsgid INT,              -- Message body in the emailblob table
@   ectime INT,              -- Time enqueued.  Seconds since 1970
@   emtime INT,              -- Time of last send attempt.  Sec since 1970
@   ensend INT,              -- Number of send attempts
@   ets INT                  -- Transcript of last failed attempt
@ );
@
@ -- Triggers to automatically keep the emailblob.enref field up to date
@ -- as entries in the emailblob, emailbox, and emailoutq tables are
@ -- deleted.
@ CREATE TRIGGER IF NOT EXISTS repository.emailblob_d1
@ AFTER DELETE ON emailblob BEGIN
@   DELETE FROM emailblob WHERE enref<=1 AND emailid=old.ets;
@   UPDATE emailblob SET enref=enref-1 WHERE emailid=old.ets;
@ END;
@ CREATE TRIGGER IF NOT EXISTS repository.emailbox_d1
@ AFTER DELETE ON emailbox BEGIN
@   DELETE FROM emailblob WHERE enref<=1 AND emailid=old.emsgid;
@   UPDATE emailblob SET enref=enref-1 WHERE emailid=old.emsgid;
@ END;
@ CREATE TRIGGER IF NOT EXISTS repository.emailoutq_d1
@ AFTER DELETE ON emailoutq BEGIN
@   DELETE FROM emailblob WHERE enref<=1 AND emailid IN (old.ets,old.emsgid);
@   UPDATE emailblob SET enref=enref-1 WHERE emailid IN (old.ets,old.emsgid);
@ END;
;

/*
** Code used to delete the email tables.
*/
static const char zEmailDrop[] =
@ DROP TABLE IF EXISTS emailblob;
................................................................................
  char *zFrom;                /* MAIL FROM: argument */
  int nTo;                    /* Number of RCPT TO: lines seen */
  struct SmtpTo {
    char *z;                    /* Address in each RCPT TO line */
    int okRemote;               /* zTo can be in another domain */
  } *aTo;
  u32 srvrFlags;              /* Control flags */
  int nEts;                   /* Number of references to the transcript */
  int nRef;                   /* Number of references to idMsg */
  Blob msg;                   /* Content following DATA */
  Blob transcript;            /* Session transcript */
};

#define SMTPSRV_CLEAR_MSG    1   /* smtp_server_clear() last message only */
#define SMTPSRV_CLEAR_ALL    2   /* smtp_server_clear() everything */
#define SMTPSRV_LOG       0x001  /* Record a transcript of the interaction */
................................................................................
      if( zAddr[i]=='@' && zAddr[i+1]!=0 ){
        db_multi_exec(
          "INSERT INTO emailoutq(edomain,efrom,eto,emsgid,ectime,"
                                "emtime,ensend)"
          "VALUES(%Q,%Q,%Q,%lld,now(),0,0)",
          zAddr+i+1, p->zFrom, zAddr, p->idMsg
        );
        p->nRef++;
      }
    }
    return;
  }
  blob_init(&policy, zPolicy, -1);
  while( blob_line(&policy, &line) ){
    blob_trim(&line);
................................................................................
    blob_token(&line, &token);
    blob_tail(&line, &tail);
    if( blob_size(&tail)==0 ) continue;
    if( blob_eq_str(&token, "mbox", 4) ){
      Blob subj;
      email_header_value(&p->msg, "subject", &subj);
      db_multi_exec(
        "INSERT INTO emailbox(euser,edate,efrom,emsgid,estate,esubject)"
        " VALUES(%Q,now(),%Q,%lld,0,%Q)",
          blob_str(&tail), p->zFrom, p->idMsg,
          blob_str(&subj)
      );
      blob_reset(&subj);
      p->nRef++;
    }
    if( blob_eq_str(&token, "forward", 7) ){
      smtp_append_to(p, fossil_strdup(blob_str(&tail)), 1);
    }
    blob_reset(&tail);
  }
}
................................................................................
  Stmt s;
  int i;
  if( p->zFrom
   && p->nTo
   && blob_size(&p->msg)
   && (p->srvrFlags & SMTPSRV_DRYRUN)==0
  ){
    db_begin_write();
    if( p->idTranscript==0 ) smtp_server_schema(0);
    p->nRef = 0;
    db_prepare(&s,
      "INSERT INTO emailblob(ets,etime,etxt,enref)"
      " VALUES(:ets,now(),compress(:etxt),:enref)"
    );
    p->nEts++;
    if( !bFinish && p->idTranscript==0 ){
      db_bind_null(&s, ":ets");
      db_bind_null(&s, ":etxt");
      db_bind_int(&s, ":enref", 0);
      db_step(&s);
      db_reset(&s);
      p->idTranscript = db_last_insert_rowid();
    }else if( bFinish ){
      if( p->idTranscript ){
        db_multi_exec(
           "UPDATE emailblob SET etxt=compress(%Q), enref=%d"
           " WHERE emailid=%lld",
           blob_str(&p->transcript), p->nEts, p->idTranscript);
      }else{
        db_bind_null(&s, ":ets");
        db_bind_str(&s, ":etxt", &p->transcript);
        db_bind_int(&s, ":enref", p->nEts);
        db_step(&s);
        db_reset(&s);
        p->idTranscript = db_last_insert_rowid();
      }
    }
    db_bind_int64(&s, ":ets", p->idTranscript);
    db_bind_str(&s, ":etxt", &p->msg);
    db_bind_int(&s, ":enref", 0);
    db_step(&s);
    db_finalize(&s);
    p->idMsg = db_last_insert_rowid();

    /* make entries in emailbox and emailoutq */
    for(i=0; i<p->nTo; i++){
      int okRemote = p->aTo[i].okRemote;
      p->aTo[i].okRemote = 1;
      smtp_server_send_one_user(p, p->aTo[i].z, okRemote);
    }

    /* Fix up the emailblob.enref field of the email message body */
    if( p->nRef ){
      db_multi_exec(
        "UPDATE emailblob SET enref=%d WHERE emailid=%lld", 
        p->nRef, p->idMsg
      );
    }else{
      db_multi_exec(
        "DELETE FROM emailblob WHERE emailid=%lld", p->idMsg
      );
    }

    /* Finish the transaction after all changes are implemented */
    db_commit_transaction();
  }
  smtp_server_clear(p, SMTPSRV_CLEAR_MSG);
}

/*
** COMMAND: test-emailblob-refcheck
**
** Usage: %fossil test-emailblob-refcheck [--repair] [--full]
**
** Verify that the emailblob.enref field is correct.  Report any errors.
** Use the --repair command to fix up the enref field.  The --full option
** gives a full report showing the enref value on all entries in the
** emailblob table.
*/
void test_refcheck_emailblob(void){
  int doRepair;
  int fullReport;
  Blob sql;
  Stmt q;
  int nErr = 0;
  db_find_and_open_repository(0, 0);
  fullReport = find_option("full",0,0)!=0;
  doRepair = find_option("repair",0,0)!=0;
  verify_all_options();
  if( !db_table_exists("repository","emailblob") ){
    fossil_print("emailblob table is not configured - nothing to check\n");
    return;
  }
  db_multi_exec(
    "CREATE TEMP TABLE refcnt(id INTEGER PRIMARY KEY, n);"
    "INSERT INTO refcnt SELECT ets, count(*) FROM ("
    "  SELECT ets FROM emailblob"
    "  UNION ALL"
    "  SELECT emsgid FROM emailbox"
    "  UNION ALL"
    "  SELECT emsgid FROM emailoutq"
    ") WHERE ets IS NOT NULL GROUP BY 1;"
    "INSERT OR IGNORE INTO refcnt(id,n) SELECT emailid, 0 FROM emailblob;"
  );
  if( doRepair ){
    db_multi_exec(
      "UPDATE emailblob SET enref=(SELECT n FROM refcnt WHERE id=emailid)"
    );
  }
  blob_init(&sql, 0, 0);
  blob_append_sql(&sql, 
    "SELECT a.emailid, a.enref, b.n"
    "  FROM emailblob AS a JOIN refcnt AS b ON a.emailid=b.id"
  );
  if( !fullReport ){
    blob_append_sql(&sql, " WHERE a.enref!=b.n");
  }
  db_prepare_blob(&q, &sql);
  blob_reset(&sql);
  while( db_step(&q)==SQLITE_ROW ){
    sqlite3_int64 id = db_column_int64(&q,0);
    int n1 = db_column_int(&q, 1);
    int n2 = db_column_int(&q, 2);
    if( n1!=n2 ) nErr++;
    fossil_print("%12lld %4d %4d%s\n", id, n1, n2, n1!=n2 ? " ERROR" : "");
  }
  db_finalize(&q);
  if( nErr ){
    fossil_print("Number of incorrect emailblob.enref values: %d\n",nErr);
  }
}


/*
** COMMAND: smtpd
**
** Usage: %fossil smtpd [OPTIONS] REPOSITORY
**
** Begin a SMTP conversation with a client using stdin/stdout.  The