Module: sip-router Branch: tirpi/cfg_framework_multivalue Commit: 778ecd4f3c40124c019edd74fe0d70b3d86d4c1c URL: http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=778ecd4… Author: Miklos Tirpak &lt;miklos(a)iptel.org&gt; Committer: Miklos Tirpak &lt;miklos(a)iptel.org&gt; Date: Mon Oct 4 17:18:31 2010 +0200 cfg framework: multiple group instances is documented --- doc/cfg.txt | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 60 insertions(+), 1 deletions(-) diff --git a/doc/cfg.txt b/doc/cfg.txt index df1209c..dd9e959 100644 --- a/doc/cfg.txt +++ b/doc/cfg.txt @@ -26,6 +26,15 @@ without the need of commit. That means a kind of transaction support, the framework can keep track of the changes (per driver) until they are committed or rolled-back. +The framework also supports multiple versions of the core or module +configurations. Every SIP message processing or timer function starts with +the default version which can be changed runtime in the script. Hence, even if +the core/module implements a variable with a single value, it may have multiple +instances with different values in memory, and the configuration instances can be +swapped runtime. New instances of a configuration group can be added and deleted +runtime by the drivers, and all the variables in the group instances take +the default value unless their value has been explicitely set. + 2. Using the framework in a module =============================================================================== @@ -130,6 +139,8 @@ Each row consists of the following items: of the cfg framework. By default this callback is called by all the child processes separately, this can be changed with this flag. + Multiple values are not supported together with + the CFG_CB_ONLY_ONCE flag. - minimum value for integers (optional) - maximum value for integers (optional) @@ -323,10 +334,11 @@ void *h; str gname, vname; void *old_val, *new_val; unsigned int val_type; +unsigned int *group_id; if (cfg_diff_init(ctx, &h)) return -1; while(cfg_diff_next(&h, - &gname, &vname, + &gname, &group_id, &vname, &old_val, &new_val, &val_type) ) { @@ -334,6 +346,11 @@ while(cfg_diff_next(&h, } cfg_diff_release(ctx); +------------------------------------------------------------------------------- +9. Add/delete an instance of an existing group: + +cfg_add_group_inst() +cfg_del_group_inst() 5. Refreshing the configuration =============================================================================== @@ -424,3 +441,45 @@ New configuration values can be declared in the script, the syntax is: The values can be accessed via select calls: @cfg_get.<group_name>.<var_name> + + +Use the following syntax to set an additional instance of a configuration value: + +<group_name>[id].<var_name> = <value> + +id is an unsigned integer starting from 0, it does not have to be continuous. +Note, that not the variables but the entire configuration group can have multiple +instances, and it is possible to swap the configuration of the entire group at once +with cfg_select("group_name", id), see the example below: + +custom.var1 = 1; +custom.var2 = "default string"; + +custom[1].var1 = 15; +custom[1].var2 = "More specific string"; + +custom[2].var1 = 3; +# custom[2].var2 is not set, hence, it will inherit the value of custom.var2. +# When custom.var2 changes, custom[2].var1 will be also updated. + + +route { + # Actual values: var1:1, var2:"default string" + + cfg_select("custom", 1); + # Actual values: var1:15, var2:"More specific string" + + cfg_select("custom", 2"); + # Actual values: var1:3, var2:"default string" + + cfg_reset("custom") + # Actual values: var1:1, var2:"default string" +} + +cfg_reset("group_name") can be used to reset the configuration back to the original values. +The values are automatically reseted before each SIP message is started to be processed, or after +each timer function execution. +The above example with custom variables is supported also with module and core configuration +groups. The only restriction is that variables with CFG_CB_ONLY_ONCE flag cannot have +multiple values. +