core: make zstd dependency optional (closes #2024)

src/plugins/logger/logger-buffer.c

@@ -375,6 +375,7 @@ logger_buffer_compress_file (struct t_logger_buffer *logger_buffer)
                 unlink (filename);
             }
             break;
+#ifdef HAVE_ZSTD
         case LOGGER_BUFFER_COMPRESSION_ZSTD:
             if (weechat_file_compress (filename, new_filename,
                                        "zstd", compression_level))
@@ -382,6 +383,7 @@ logger_buffer_compress_file (struct t_logger_buffer *logger_buffer)
                 unlink (filename);
             }
             break;
+#endif
         default:
             break;
     }
@@ -477,6 +479,12 @@ logger_buffer_rotate (struct t_logger_buffer *logger_buffer)
 
     compression_type = weechat_config_enum (
         logger_config_file_rotation_compression_type);
+
+#ifndef HAVE_ZSTD
+    if (compression_type == LOGGER_BUFFER_COMPRESSION_ZSTD)
+        compression_type = LOGGER_BUFFER_COMPRESSION_NONE;
+#endif
+
     ptr_extension = logger_buffer_compression_extension[compression_type];
 
     /* find the highest existing extension index */

src/plugins/logger/logger-config.c

@@ -93,6 +93,32 @@ logger_config_change_file_option_restart_log (const void *pointer, void *data,
         logger_buffer_adjust_log_filenames ();
 }
 
+/*
+ * Callback for changes on compression type option.
+ */
+
+void
+logger_config_change_file_rotation_comp_type (const void *pointer,
+                                              void *data,
+                                              struct t_config_option *option)
+{
+    /* make C compiler happy */
+    (void) pointer;
+    (void) data;
+    (void) option;
+
+#ifndef HAVE_ZSTD
+    if (weechat_config_enum (option) == LOGGER_BUFFER_COMPRESSION_ZSTD)
+    {
+        weechat_printf (NULL,
+                        _("%s%s: zstd compression is not available, "
+                          "logger files will not be compressed"),
+                        weechat_prefix ("error"),
+                        LOGGER_PLUGIN_NAME);
+    }
+#endif
+}
+
 /*
  * Callback for changes on option "logger.file.color_lines".
  */
@@ -666,7 +692,9 @@ logger_config_init ()
                "new type (or decompress files), then change the option in "
                "logger.conf, then load the logger plugin"),
             "none|gzip|zstd", 0, 0, "none", NULL, 0,
-            NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
+            NULL, NULL, NULL,
+            &logger_config_change_file_rotation_comp_type, NULL, NULL,
+            NULL, NULL, NULL);
         logger_config_file_rotation_size_max = weechat_config_new_option (
             logger_config_file, logger_config_section_file,
             "rotation_size_max", "string",

src/plugins/relay/CMakeLists.txt

@@ -50,8 +50,10 @@ list(APPEND LINK_LIBS ${GCRYPT_LDFLAGS})
 
 list(APPEND LINK_LIBS ${ZLIB_LIBRARY})
 
-include_directories(${ZSTD_INCLUDE_DIRS})
-list(APPEND LINK_LIBS ${LIBZSTD_LDFLAGS})
+if(ENABLE_ZSTD)
+  include_directories(${ZSTD_INCLUDE_DIRS})
+  list(APPEND LINK_LIBS ${LIBZSTD_LDFLAGS})
+endif()
 
 target_link_libraries(relay ${LINK_LIBS} coverage_config)
 

src/plugins/relay/weechat/relay-weechat-msg.c

@@ -29,7 +29,9 @@
 #include <errno.h>
 #include <arpa/inet.h>
 #include <zlib.h>
+#ifdef HAVE_ZSTD
 #include <zstd.h>
+#endif
 
 #include "../../weechat-plugin.h"
 #include "../relay.h"
@@ -1111,6 +1113,7 @@ int
 relay_weechat_msg_compress_zstd (struct t_relay_client *client,
                                  struct t_relay_weechat_msg *msg)
 {
+#ifdef HAVE_ZSTD
     char raw_message[1024];
     uint32_t size32;
     Bytef *dest;
@@ -1169,6 +1172,13 @@ error:
         free (dest);
 
     return rc;
+#else
+    /* make C compiler happy */
+    (void) client;
+    (void) msg;
+
+    return 0;
+#endif /* HAVE_ZSTD */
 }
 
 /*
@@ -1190,10 +1200,12 @@ relay_weechat_msg_send (struct t_relay_client *client,
                 if (relay_weechat_msg_compress_zlib (client, msg))
                     return;
                 break;
+#ifdef HAVE_ZSTD
             case RELAY_WEECHAT_COMPRESSION_ZSTD:
                 if (relay_weechat_msg_compress_zstd (client, msg))
                     return;
                 break;
+#endif
             default:
                 break;
         }

src/plugins/relay/weechat/relay-weechat.c

@@ -40,8 +40,14 @@
 #include "../relay-raw.h"
 
 
-char *relay_weechat_compression_string[] = /* strings for compression       */
-{ "off", "zlib", "zstd" };
+/* strings for compression */
+char *relay_weechat_compression_string[RELAY_WEECHAT_NUM_COMPRESSIONS] = {
+    "off",
+    "zlib",
+#ifdef HAVE_ZSTD
+    "zstd",
+#endif
+};
 
 
 /*

src/plugins/relay/weechat/relay-weechat.h

@@ -34,7 +34,9 @@ enum t_relay_weechat_compression
 {
     RELAY_WEECHAT_COMPRESSION_OFF = 0, /* no compression of binary objects  */
     RELAY_WEECHAT_COMPRESSION_ZLIB,    /* zlib compression                  */
+#ifdef HAVE_ZSTD
     RELAY_WEECHAT_COMPRESSION_ZSTD,    /* Zstandard compression             */
+#endif
     /* number of compressions */
     RELAY_WEECHAT_NUM_COMPRESSIONS,
 };