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OpenLDAP Architecture

OpenLDAP Architecture. Refactoring ABIs Howard Chu March 21, 2003 hyc@symas.com. Objectives: Why Change?. Reduce Redundant Functions Streamline Calling Sequences Enhance Callback Functionality. Reduce Redundancy. bi_op_attribute and bi_op_group Both share a lot of code in common

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OpenLDAP Architecture

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  1. OpenLDAP Architecture Refactoring ABIs Howard Chu March 21, 2003 hyc@symas.com

  2. Objectives: Why Change? • Reduce Redundant Functions • Streamline Calling Sequences • Enhance Callback Functionality

  3. Reduce Redundancy • bi_op_attribute and bi_op_group • Both share a lot of code in common • Frequently require the same bug fixes • backend_group is just backend_attribute with one additional check • Replace with bi_op_entry, get more functionality at the same time

  4. Streamline Calling Sequences • ~ 20% of functions in slapd take Backend, Connection, Operation arguments • 58 of 305 declarations in proto-slap.h • All of the backend operations take <ditto> • They are needed together so frequently, they are essentially one parameter • Consolidating into Operation ensures they are all always available when needed

  5. Enhance Callbacks • Callbacks don’t have direct access to request parameters, must re-parse ber • Again, multiple related arguments for results • Conn, Op, err, matched, text, Controls • Callback nesting eats up stack for arguments • Consolidating parameters into Operation provides more functionality while improving execution efficiency

  6. Other Considerations • Backend layering • Reimplement back-meta as an engine that can be overlaid over any other backend – suffixalias done right, among other things • Overlay back-ldap over any other backend – handle chaining instead of returning references to client

  7. Conclusions • Improve maintainability • Eliminate redundant code, only need to fix bugs once • Improve efficiency and scalability • Enables additional functionality with minimal overhead

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