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acs-service-contract-procs.tcl

Support library for acs service contracts.

Location:
packages/acs-service-contract/tcl/acs-service-contract-procs.tcl
Created:
2001-09-01
Author:
Neophytos Demetriou
CVS Identification:
$Id: acs-service-contract-procs.tcl,v 1.33.2.7 2023/01/04 16:33:03 antoniop Exp $

Procedures in this file

Detailed information

acs_sc::invoke (public)

 acs_sc::invoke [ -contract contract ] -operation operation \
    [ -impl impl ] [ -impl_id impl_id ] [ -call_args call_args ] \
    [ -error ]

A replacement of the former acs_sc_call procedure. One must supply either contract and impl, or just impl_id. If you supply impl_id and contract, we throw an error if the impl_id's contract doesn't match the contract you passed in. If you supply both impl_id and impl, we throw an error. Additional documentation and commentary at http://openacs.org/forums/message-view?message_id=108614.

Switches:
-contract
(optional)
The name of the contract you wish to use.
-operation
(required)
The name of the operation in the contract you wish to call.
-impl
(optional)
The name of the implementation you wish to use.
-impl_id
(optional)
The ID of the implementation you wish to use.
-call_args
(optional)
The arguments you want to pass to the proc.
-error
(boolean) (optional)
If specified, will throw an error if the operation isn't implemented.
Author:
Lars Pind <lars@collaboraid.biz>
See Also:

Partial Call Graph (max 5 caller/called nodes):
%3 test_sync_file_get_document sync_file_get_document (test acs-authentication) acs_sc::invoke acs_sc::invoke test_sync_file_get_document->acs_sc::invoke test_sync_http_get_document sync_http_get_document (test acs-authentication) test_sync_http_get_document->acs_sc::invoke acs_sc::impl::get acs_sc::impl::get (public) acs_sc::invoke->acs_sc::impl::get acs_sc_generate_name acs_sc_generate_name (private) acs_sc::invoke->acs_sc_generate_name acs_sc_call acs_sc_call (private, deprecated) acs_sc_call->acs_sc::invoke acs_user_extension::dispatch acs_user_extension::dispatch (private) acs_user_extension::dispatch->acs_sc::invoke auth::authentication::authenticate auth::authentication::authenticate (public) auth::authentication::authenticate->acs_sc::invoke auth::driver::GetParameters auth::driver::GetParameters (public, deprecated) auth::driver::GetParameters->acs_sc::invoke auth::driver::get_parameters auth::driver::get_parameters (public) auth::driver::get_parameters->acs_sc::invoke

Testcases:
sync_http_get_document, sync_file_get_document

acs_sc_binding_exists_p (public)

 acs_sc_binding_exists_p contract impl

Returns a boolean depending on whether or not the binding between the contract and implementation exists.

Parameters:
contract - the contract name
impl - the implementation name
Returns:
boolean
Author:
Neophytos Demetriou

Partial Call Graph (max 5 caller/called nodes):
%3 test_acs_sc_impl_new_from_spec acs_sc_impl_new_from_spec (test acs-service-contract) acs_sc_binding_exists_p acs_sc_binding_exists_p test_acs_sc_impl_new_from_spec->acs_sc_binding_exists_p db_string db_string (public) acs_sc_binding_exists_p->db_string acs_sc_get_alias acs_sc_get_alias (private) acs_sc_get_alias->acs_sc_binding_exists_p etp::create_search_impl etp::create_search_impl (public) etp::create_search_impl->acs_sc_binding_exists_p etp::search_impl_exists_p etp::search_impl_exists_p (public) etp::search_impl_exists_p->acs_sc_binding_exists_p oacs_dav::handle_request oacs_dav::handle_request (public) oacs_dav::handle_request->acs_sc_binding_exists_p search::indexer search::indexer (private) search::indexer->acs_sc_binding_exists_p

Testcases:
acs_sc_impl_new_from_spec

acs_sc_update_alias_wrappers (public)

 acs_sc_update_alias_wrappers

Loop over actual bindings, finding every impl alias for each contract operation and call "acs_sc_proc" for all of these.

See Also:

Partial Call Graph (max 5 caller/called nodes):
%3 packages/acs-automated-testing/tcl/authority-init.tcl packages/acs-automated-testing/ tcl/authority-init.tcl acs_sc_update_alias_wrappers acs_sc_update_alias_wrappers packages/acs-automated-testing/tcl/authority-init.tcl->acs_sc_update_alias_wrappers packages/acs-service-contract/tcl/acs-service-contract-init.tcl packages/acs-service-contract/ tcl/acs-service-contract-init.tcl packages/acs-service-contract/tcl/acs-service-contract-init.tcl->acs_sc_update_alias_wrappers acs_sc_generate_name acs_sc_generate_name (private) acs_sc_update_alias_wrappers->acs_sc_generate_name acs_sc_proc acs_sc_proc (private) acs_sc_update_alias_wrappers->acs_sc_proc db_foreach db_foreach (public) acs_sc_update_alias_wrappers->db_foreach

Testcases:
No testcase defined.
[ hide source ] | [ make this the default ]

Content File Source

ad_library {
    Support library for acs service contracts.

    @author Neophytos Demetriou
    @creation-date 2001-09-01
    @cvs-id $Id: acs-service-contract-procs.tcl,v 1.33.2.7 2023/01/04 16:33:03 antoniop Exp $
}

namespace eval acs_sc {}

#####
#
# Invoke
#
#####

d_proc -public acs_sc::invoke {
    {-contract ""}
    {-operation:required}
    {-impl ""}
    {-impl_id ""}
    {-call_args {}}
    {-error:boolean}
} {
    A replacement of the former acs_sc_call procedure.
    One must supply either contract and impl, or just impl_id.
    If you supply impl_id and contract, we throw an error if the impl_id's contract doesn't match
    the contract you passed in. If you supply both impl_id and impl, we throw an error.

    Additional documentation and commentary at http://openacs.org/forums/message-view?message_id=108614.

    @param contract The name of the contract you wish to use.
    @param operation The name of the operation in the contract you wish to call.
    @param impl The name of the implementation you wish to use.
    @param impl_id The ID of the implementation you wish to use.
    @param call_args The arguments you want to pass to the proc.
    @param error If specified, will throw an error if the operation isn't implemented.


    @author Lars Pind (lars@collaboraid.biz)
    @see acs_sc_call
} {
    if { $impl_id ne "" } {
        if { $impl ne "" } {
            error "Cannot supply both impl and impl_id"
        }
        acs_sc::impl::get -impl_id $impl_id -array impl_info
        set impl $impl_info(impl_name)
        if { $contract ne "" && $contract ne $impl_info(impl_contract_name) } {
            error "The contract of implementation with id $impl_id does not match contract passed in. Expected contract to be '$contract', but contract of impl_id was '$impl_info(impl_contract_name)'"
        }
        set contract $impl_info(impl_contract_name)
    }
    if { $impl eq "" || $contract eq "" } {
        error "You must supply either impl_id, or contract and impl to acs_sc::invoke"
    }

    set proc_name [acs_sc_generate_name $contract $impl $operation]

    if { [namespace which $proc_name] ne "" } {
        # ns_log warning "CALL FORMER ad_apply [list $proc_name {*}$call_args]"
        # ns_log warning "$proc_name {*}$call_args"
        return [$proc_name {*}$call_args]
    }

    if { $error_p } {
        error "Operation $operation is not implemented in '$impl' implementation of contract '$contract'"
    } else {
        ns_log warning "ACS-SC: Function Not Found: $proc_name [namespace which $proc_name]"
    }
    return
}


#####
#
# All the rest that used to be there
#
#####

d_proc -public acs_sc_binding_exists_p {
    contract
    impl
} {
    Returns a boolean depending on whether or not the binding between
    the contract and implementation exists.

    @param contract the contract name
    @param impl the implementation name

    @return boolean

    @author Neophytos Demetriou
} {
    return [db_string binding_exists_p {
        select case when exists
        (select 1 from acs_sc_bindings
         where contract_id = (select contract_id
                              from acs_sc_contracts
                              where contract_name = :contract)
           and impl_id = (select impl_id
                          from acs_sc_impls
                          where impl_name = :impl
                          and impl_contract_name = :contract))
        then 1 else 0 end
        from dual
    }]
}

d_proc -private acs_sc_generate_name {
    contract
    impl
    operation
} {
    generate the internal proc name.

    @author Neophytos Demetriou
} {
    return "AcsSc.[util_text_to_url -no_resolve -replacement "_" -text $contract].[util_text_to_url -no_resolve -replacement "_" -text $operation].[util_text_to_url -no_resolve -replacement "_" -text $impl]"
}


d_proc -private acs_sc_get_alias {
    contract
    operation
    impl
} {
    Returns the implementation alias (the
    proc defined to handle a given operation
    for a given implementation).

    @author Neophytos Demetriou
} {
    # LARS
    set exists_p [acs_sc_binding_exists_p $contract $impl]

    #set exists_p [util_memoize [list acs_sc_binding_exists_p $contract $impl]]

    if {![set exists_p]} {return ""}

    db_0or1row get_alias {
        select impl_alias, impl_pl
          from acs_sc_impl_aliases
         where impl_contract_name  = :contract
           and impl_operation_name = :operation
           and impl_name           = :impl
    }

    return [list $impl_alias $impl_pl]

}

d_proc -private acs_sc_proc {
    contract
    operation
    impl
    {impl_alias {}}
    {impl_pl {}}
} {
    Builds the proc used by acs_sc::invoke, generally only called
    in acs-service-contract-init.tcl at startup.

    @return 0 on failure, 1 on success.
    @author Neophytos Demetriou
} {
    set arguments [list]
    set docblock {}

    set proc_name [acs_sc_generate_name $contract $impl $operation]

    acs_sc_log SCDebug "ACS_SC_PROC: proc_name = $proc_name"

    if { $impl_alias eq "" } {
        lassign [acs_sc_get_alias $contract $operation $impl] impl_alias impl_pl
    }

    if { $impl_alias eq "" } {
        error "ACS-SC: Cannot find alias for $proc_name"
    }

    if {![db_0or1row get_operation_definition {
        select
            operation_desc,
                coalesce(operation_iscachable_p,'f') as operation_iscachable_p,
            operation_nargs,
            operation_inputtype_id,
            operation_outputtype_id
        from acs_sc_operations
        where contract_name = :contract
        and operation_name = :operation
    }]} {
        ns_log warning "ACS-SC: operation definition not found for contract $contract operation $operation"
        return 0
    }

    append docblock "\n<b>acs-service-contract operation.  Call via acs_sc::invoke.</b>\n\n$operation_desc\n\n"

    set msg_type_id $operation_inputtype_id
    db_foreach operation_msgtype_element {} {
        lappend arguments "$element_name"
        append docblock "\n@param $element_name $element_msg_type_name"
        if { $element_msg_type_isset_p } {
            append docblock " \[\]"
        }
    }

    set msg_type_id $operation_outputtype_id
    db_foreach operation_msgtype_element {} {
        append docblock "\n@return <b>$element_name</b> - $element_msg_type_name"
        if { $element_msg_type_isset_p } {
            append docblock " \[\]"
        }
    }

    append docblock "\n@see $impl_alias\n@see acs_sc::invoke"

    set full_statement [acs_sc_get_statement $impl_alias $impl_pl $arguments]

    if { $operation_iscachable_p } {
        set full_statement "util_memoize \"$full_statement\""
    }

#FIX ME: CALL BY NAME USING UPVAR
    set body "return \[$full_statement\]"

    set arguments [join $arguments]
    acs_sc_log SCDebug "ACS-SC: ad_proc $proc_name $arguments\n$docblock\n$body\n"
    d_proc -private $proc_name $arguments $docblock $body

    return 1
}

ad_proc acs_sc_update_alias_wrappers {} {

    Loop over actual bindings, finding every impl alias for each contract operation
    and call "acs_sc_proc" for all of these.

    @see acs_sc_proc

} {
    db_foreach impl_operation {
        select ia.impl_contract_name,
               ia.impl_operation_name,
               ia.impl_name,
               ia.impl_alias,
               ia.impl_pl
        from   acs_sc_bindings b, acs_sc_impl_aliases ia
        where  ia.impl_id = b.impl_id
    } {
        #
        # Create the AcsSc.Contract.Operation.Impl wrapper proc for this implementation
        #
        if {[catch {
            #
            # Check, if the wrapper exists already
            #
            set proc_name [acs_sc_generate_name $impl_contract_name $impl_name $impl_operation_name]
            if {[namespace which ::$proc_name] eq ""} {
                #
                # Create it new.
                #
                acs_sc_proc $impl_contract_name $impl_operation_name $impl_name $impl_alias $impl_pl
            }
        } errorMsg]} {
            ns_log error "Service contract initialization failed, call was:\n\
                acs_sc_proc $impl_contract_name $impl_operation_name $impl_name $impl_alias $impl_pl"
        }
    }
}

d_proc -private acs_sc_get_statement {
    impl_alias
    impl_pl
    arguments
} {
    Builds the statement to call from the provided metadata.

    @param impl_alias Tcl or plpgsql proc to call
    @param impl_pl programmimg language of the proc to call (TCL or PLPGSQL)
    @param arguments list of argument names

    @author Neophytos Demetriou
} {


    switch $impl_pl {
        TCL {
            set full_statement [list $impl_alias]
            for {set __i 0} {$__i < [llength $arguments]} {incr __i} {
                lappend full_statement "\$[lindex $arguments $__i]"
            }
            set full_statement [join $full_statement]
        }
        PLPGSQL {
            set args_list [list]
            for {set __i 0} {$__i < [llength $arguments]} {incr __i} {
                lappend args_list "\$[lindex $arguments $__i]"
            }
            set args_final [join $args_list ,]
            set full_statement "db_exec_plsql full_statement \"select ${impl_alias}(${args_final})\""
        }
        default {
            error "ACS-SC: Unknown impl_pl: $impl_pl"
        }
    }

    return $full_statement
}

d_proc -private -deprecated acs_sc_call {
    {-error:boolean}
    contract
    operation
    {arguments ""}
    {impl ""}
} {
    Additional documentation and commentary at http://openacs.org/forums/message-view?message_id=108614.

    @param contract the contract name
    @param operation the method to invoke
    @param arguments list of arguments to pass to the method
    @param impl the implementation name.
    @param error If specified, will throw an error if the operation isn't implemented.

    @author Neophytos Demetriou

    @see acs_sc::invoke
} {
    acs_sc::invoke -contract $contract -operation $operation -impl $impl -call_args $arguments -error=$error_p
}


##
## Logging
##

# Private logging proc
proc acs_sc_log {level msg} {
    # If you want to debug the SC, uncomment the Debug log below
    if { "SCDebug" ne $level } {
        ns_log $level "$msg"
    } else {
        # ns_log Debug "$msg"
    }
}

# Local variables:
#    mode: tcl
#    tcl-indent-level: 4
#    indent-tabs-mode: nil
# End: