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<td id="header-avatar-image-container" valign="top" style="padding: 0px; border-collapse: collapse; vertical-align: top; width: 32px; padding-right: 9px"><a href="https://wiki.asterisk.org/wiki/display/~mmichelson?src=email" style="color: #3b73af; text-decoration: none"><img id="header-avatar-image" class="image_fix" src="cid:avatar_99ed0aa29d6f204db4785296f8170422" height="32" width="32" border="0" style="border-radius: 3px; vertical-align: top" /></a></td>
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<table class="content-excerpt-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; color: #333; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 1px">
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<td class="content-excerpt-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 0 24px"> <p class="diff-context-placeholder" style="margin: 10px 0 0 0; margin-top: 0">...</p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">Subscription handlers are no longer able to directly send NOTIFYs on one of their <code style="font-family: monospace">ast_sip_subscriptions</code> because the subscription does not directly correlate to a real SIP subscription. <span class="diff-html-added" id="added-diff-0" style="font-size: 100%; background-color: #ddfade;">This means that anything the subscription handlers were doing previously where they would reach across the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">res_pjsip_pubsub</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> layer into PJSIP will no longer be valid.</span> </p> <h1 id="PJSIPSubscriptionAbstractionPlan-Internalchanges" class="diff-block-target diff-block-context" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0"> <span class="diff-html-added" id="added-diff-1" style="font-size: 100%; background-color: #ddfade;">Internal changes</span> </h1> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">There will be many internal changes that get made as part of RLS work, but the only change that needs to be made is to alter the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ast_sip_subscription</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> structure so it may more easily conform to the drawing above.</span> </p> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Currently the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ast_sip_subscription</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> structure has, in part, the following:</span> </p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</span></th>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">struct ast_sip_subscription {
pjsip_evsub *evsub;
};</span>
</pre> </td>
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</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">With the division between real and virtual subscriptions, it makes no sense for virtual subscriptions to have a pointer to a </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">pjsip_evsub</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">. Instead, having a pointer to the parent subscription makes much more sense. Real subscriptions should still have a pointer to the PJSIP subscription, though. A union works well for this. Finally, given the tree-like structure of </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">ast_sip_subscription</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">, appropriate fields need to be added to support this.</span> </p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</span></th>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> enum sip_subscription_type {
SIP_SUBSCRIPTION_REAL,
SIP_SUBSCRIPTION_VIRTUAL,
};
struct ast_sip_subscription {
/*! Indicator if subscription is real or virtual */
enum sip_subscription_type type;
union {
/*! Real subscriptions point to a PJSIP subscription */
pjsip_evsub *evsub;
/*! Virtual subscriptions point to a parent Asterisk subscription */
struct ast_sip_subscription *parent;
};
/*! Pointer to next sibling subscription */
AST_LIST_ENTRY(ast_sip_subscription) list;
/*! List of child subscriptions */
AST_LIST_HEAD(,ast_sip_subscription) children;
}; </span>
</pre> </td>
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</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> </span> </p> <h1 id="PJSIPSubscriptionAbstractionPlan-GeneralAPIchanges" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0">General API changes</h1> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" id="added-diff-2" style="font-size: 100%; background-color: #ddfade;">The biggest removals from the API the following:</span> </p>
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<th class="diff-macro-title" style="background-color: transparent; text-align: left; font-weight: normal;padding: 5px;"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"><span class="icon macro-placeholder-icon" style="background-color: ;line-height: 20px;"><img src="https://wiki.asterisk.org/wiki/s/en_GB-1988229788/4732/f543bd9a3bbc12daed85f6f5e5cba84282599932.48/_/plugins/servlet/confluence/placeholder/macro-icon?name=code" style="padding-right: 5px; vertical-align: text-bottom;" /> </span>Code Block</span></th>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">pjsip_evsub *ast_sip_subscription_get_evsub(struct ast_sip_subscription *sub);
pjsip_dialog *ast_sip_subscription_get_dlg(struct ast_sip_subscription *sub);</span>
</pre> </td>
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</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Those two functions both assume that the subscription has a corresponding PJSIP subscription beneath it. However, users of the pubsub API can no longer make such an assumption since the subscription they interact with may be virtual. The main uses of these two functions by subscription handlers were as follows:</span> </p>
<ul class="diff-block-target diff-block-context" style="margin: 10px 0 0 0">
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Getting the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">pjsip_evsub</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> in order to transmit a NOTIFY request.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Getting the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">pjsip_evsub</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> in order to accept an inbound SUBSCRIBE request.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Getting the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">pjsip_evsub</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> to get the current subscription state.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Getting the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">pjsip_evsub</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> to terminate a subscription on an inbound SUBSCRIBE request.</span> </li>
<li> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">Getting the </span><code style="font-family: monospace"><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">pjsip_dialog</span></code><span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;"> to get local and remote information.</span> </li>
</ul> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">In order to satisfy previously-required functionality, new API calls will be added to the pubsub API to replace the old functionality:</span> </p>
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<td class="diff-macro-body" style="background-color: #fff;border: 1px solid #dddddd;padding: 10px;; padding: 0px; border-collapse: collapse"> <pre style="margin: 10px 0 0 0; margin-top: 0">
<span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">/*! Notify a SIP subscription of a state change.
* This will create a SIP NOTIFY request, send the notify_data to
* a body generator, and then send the NOTIFY request out.
*/
int ast_sip_subscription_notify(struct ast_sip_subscription *sub, void *notify_data);
/*! Reject an incoming SIP SUBSCRIBE request.
* This will send the specified response to the SUBSCRIBE. If a
* NULL reason is specified, then default reason text will be used.
*/
void ast_sip_subscription_reject(struct ast_sip_subscription *sub, int response, const char *reason);
/*! Accept an incoming SIP SUBSCRIBE request with a 200 OK. */
void ast_sip_subscription_accept(struct ast_sip_subscription *sub);
/*! Retrieve the local URI for this subscription */
void ast_sip_subscription_get_local_uri(struct ast_sip_subscription *sub, char *buf, size_t size);
/*! Retrive the remote URI for this subscription */
void ast_sip_subscription_get_remote_uri(struct ast_sip_subscription *sub, char *buf, size_t size);
/*! Terminate an active SIP subscription */</span>
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</table> <p class="diff-block-target diff-block-context" style="margin: 10px 0 0 0"> <span class="diff-html-added" style="font-size: 100%; background-color: #ddfade;">You'll notice that there is no function to get the current subscription state. This is because it is unnecessar</span> </p> <h1 id="PJSIPSubscriptionAbstractionPlan-Changestonotifierusage" class="diff-block-context" style="margin: 10px 0 0 0; font-size: 24px; font-weight: normal; line-height: 30px; margin: 40px 0 0 0">Changes to notifier usage</h1> <p class="diff-context-placeholder" style="margin: 10px 0 0 0">...</p> </td>
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