[asterisk-dev] [Code Review] 2858: res_pjsip_header_funcs: New module to create PJSIP_HEADER, PJSIPAddHeader and PJSIPRemoveHeader

[Joshua Colp]

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Ship it!


Ship It!

- Joshua Colp


On Oct. 4, 2013, 7:06 p.m., George Joseph wrote:
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> https://reviewboard.asterisk.org/r/2858/
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> (Updated Oct. 4, 2013, 7:06 p.m.)
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> Review request for Asterisk Developers and Mark Michelson.
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> Bugs: ASTERISK-22498
>     https://issues.asterisk.org/jira/browse/ASTERISK-22498
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> Repository: Asterisk
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> Description
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> For PJSIP_HEADER, an incoming supplemental session callback is registered that takes the pjsip_hdrs from the incoming session and stores them in a linked list in the session datastore.  Calls to PJSIP_HEADER traverse over the list and return the nth matching header where 'n' is the 'number' argument to the function.
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> For PJSIPAddHeader, the first call creates a datastore and linked list and adds the datastore to the session.  The header is then created as a pjsip_hdr and added to the list.  An outgoing supplemental session callback then traverses the list and adds the headers to the outgoing pjsip_msg.
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> For PJSIPRemoveHeader, the list created with PJSIPAddHeader is traversed and all matching entries are removed.  As with SIPRemoveHeader, an empty arguments removes all headers previously added.
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> Rather than cloning the incoming pjsip_msg or using pjsip_msg to accumulate the outgoing headers, I used a simple AST_LIST. There was a lot of overhead with the clone functions and some tricky behavior with the pjsip_msg/pjsip_hdr internal lists. Using the AST_LISTs cut down on both instructions and memory.  
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> All memory allocation is from the pj_pool attached to the session.
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> Diffs
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>   /branches/12/res/res_pjsip_header_funcs.c PRE-CREATION 
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> Diff: https://reviewboard.asterisk.org/r/2858/diff/
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> Testing
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> Tested successfully...
> PJSIP_HEADER return the full value of nth specified header from either the incoming session, or headers previously added to the outgoing session by PJSIPHeader.
> PJSIP_HEADER fails if there was no header specified in the function call.
> PJSIP_HEADER fails if there was no datastore on the incoming session (should never happen).
> PJSIP_HEADER fails if the nth header wasn't found.
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> PJSIPAddHeader adds a pjsip_hdr structure to the linked list when the input string is properly formatted as "header_name:\s*header_value".
> PJSIPAddHeader fails if no ':' was found in the input string.
> PJSIPAddHeader fails if after parsing either the header name or value is empty.
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> PJSIPRemoveHeader removes all matching headers from the linked list when a partial header name is specified.
> PJSIPRemoveHeader removes all matching headers from the linked list when a full header is specified with a trailing ':'.
> PJSIPRemoveHeader removes all previously added header from the linked list when no header is specified.
> PJSIPRemoveHeader returns successfully (silently) if there was no linked list.
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> Thanks,
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> George Joseph
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>

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