Remember dirctory bw usage, and log it in the heartbeat

Closes ticket 32720.

changes/ticket32720

@@ -0,0 +1,4 @@
+  o Minor features (directory):
+    - Remember the number of bytes we have downloaded for each directory
+      purpose while bootstrapping, and while fully bootstrapped. Log this
+      information as part of the heartbeat message. Closes ticket 32720.

src/core/or/status.c

@@ -17,6 +17,7 @@
 #include "core/or/or.h"
 #include "core/or/circuituse.h"
 #include "app/config/config.h"
+#include "feature/dirclient/dirclient.h"
 #include "core/or/status.h"
 #include "feature/nodelist/nodelist.h"
 #include "core/or/relay.h"
@@ -146,6 +147,8 @@ log_heartbeat(time_t now)
          uptime, count_circuits(), bw_sent, bw_rcvd,
          hibernating?" We are currently hibernating.":"");
 
+  dirclient_dump_total_dls();
+
   if (server_mode(options) && accounting_is_enabled(options) && !hibernating) {
     log_accounting(now, options);
   }

src/feature/control/control_bootstrap.c

@@ -171,6 +171,12 @@ control_event_bootstrap_core(int loglevel, bootstrap_status_t status,
   control_event_client_status(LOG_NOTICE, "%s", buf);
 }
 
+int
+control_get_bootstrap_percent(void)
+{
+  return bootstrap_percent;
+}
+
 /** Called when Tor has made progress at bootstrapping its directory
  * information and initial circuits.
  *

src/feature/control/control_events.h

@@ -164,6 +164,7 @@ int control_event_buildtimeout_set(buildtimeout_set_event_t type,
 int control_event_signal(uintptr_t signal);
 
 void control_event_bootstrap(bootstrap_status_t status, int progress);
+int control_get_bootstrap_percent(void);
 MOCK_DECL(void, control_event_bootstrap_prob_or,(const char *warn,
                                                  int reason,
                                                  or_connection_t *or_conn));

src/feature/dirclient/dirclient.c

@@ -21,6 +21,7 @@
 #include "feature/client/entrynodes.h"
 #include "feature/control/control_events.h"
 #include "feature/dirauth/authmode.h"
+#include "feature/dirclient/dirclient.h"
 #include "feature/dirauth/dirvote.h"
 #include "feature/dirauth/shared_random.h"
 #include "feature/dircache/dirserv.h"
@@ -1964,6 +1965,40 @@ dir_client_decompress_response_body(char **bodyp, size_t *bodylenp,
   return rv;
 }
 
+/**
+ * Total number of bytes downloaded of each directory purpose, when
+ * bootstrapped, and when not bootstrapped.
+ *
+ * (For example, the number of bytes downloaded of purpose p while
+ * not fully bootstrapped is total_dl[p][false].)
+ **/
+static uint64_t total_dl[DIR_PURPOSE_MAX_][2];
+
+/**
+ * Heartbeat: dump a summary of how many bytes of which purpose we've
+ * downloaded, when bootstrapping and when not bootstrapping.
+ **/
+void
+dirclient_dump_total_dls(void)
+{
+  log_notice(LD_NET,
+             "While bootstrapping, fetched this many bytes: ");
+  for (int i=0; i < DIR_PURPOSE_MAX_; ++i) {
+    uint64_t n = total_dl[i][0];
+    if (n) {
+      log_notice(LD_NET, "    %zu (%s)", n, dir_conn_purpose_to_string(i));
+    }
+  }
+  log_notice(LD_NET,
+             "While not bootsrapping, fetched this many bytes: ");
+  for (int i=0; i < DIR_PURPOSE_MAX_; ++i) {
+    uint64_t n = total_dl[i][1];
+    if (n) {
+      log_notice(LD_NET, "    %zu (%s)", n, dir_conn_purpose_to_string(i));
+    }
+  }
+}
+
 /** We are a client, and we've finished reading the server's
  * response. Parse it and act appropriately.
  *
@@ -1997,6 +2032,16 @@ connection_dir_client_reached_eof(dir_connection_t *conn)
 
   received_bytes = connection_get_inbuf_len(TO_CONN(conn));
 
+  log_debug(LD_DIR, "Downloaded %zu bytes on connection of purpose "
+             "%s; bootstrap %d%%",
+             received_bytes,
+             dir_conn_purpose_to_string(conn->base_.purpose),
+             control_get_bootstrap_percent());
+  {
+    bool bootstrapped = control_get_bootstrap_percent() == 100;
+    total_dl[conn->base_.purpose][bootstrapped] += received_bytes;
+  }
+
   switch (connection_fetch_from_buf_http(TO_CONN(conn),
                               &headers, MAX_HEADERS_SIZE,
                               &body, &body_len, MAX_DIR_DL_SIZE,

src/feature/dirclient/dirclient.h

@@ -14,6 +14,8 @@
 
 #include "feature/hs/hs_ident.h"
 
+void dirclient_dump_total_dls(void);
+
 int directories_have_accepted_server_descriptor(void);
 void directory_post_to_dirservers(uint8_t dir_purpose, uint8_t router_purpose,
                                   dirinfo_type_t type, const char *payload,