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* Generated from: SEB_SOVEREIGN_EVENT_BUS_MASTER_SPECIFICATION.xml
* Version: 1.0.0
* Layer: L4 - Mainframe Integration (IBM i)
*
* This module implements the settlement gateway for fiscal operations,
* routing events from the Codestorm Hub RPC interface through the
* Sovereign Event Bus to immutable ledger persistence.
*
* Entry Points:
* - SEB_Fiscal_Settlement: Main RPC endpoint
* - SEB_Settlement_Confirm: Emit confirmation event
* - SEB_Settlement_Error: Handle settlement failures
*
* Cryptography: Blake3 + Ed25519 (via WORM_SEAL module)
* Database: DB2 (SOVEREIGN_LEDGER table)
* Idempotency: Via Bifrost_Hash deduplication
*
* Thread Safety: All operations are single-threaded per agent
* Multiple agents can settle in parallel
H DFTACTGRP(*NO)
H BNDDIR('QSys/ProdData/HTTP/Public/WebSphere'
H 'QSys/ProdData/HTTP/Public/ibm-http-server')
H ACTGRP('*CALLER')
H OPTION(*SRCSTMT:*NODEBUGIO)
H TIMELIMIT(600) * 10 minute timeout for settlement
/?COPY SEBEVENT
/?COPY QSYSINC/H,STRING_H
* ================================================================
* Global Variables
* ================================================================
D g_seb_chain_offset S 10I 0 INZ(0)
D g_bifrost_hash S 128A INZ('')
D g_agent_id S 16A INZ('FISCAL_SETTLE')
D g_settlement_error S 1A INZ('0')
* ================================================================
* Codestorm Hub RPC Entry Point
* ================================================================
* Called by: Codestorm Hub (RELAY adapter)
* Input: Agent_ID, Amount, Asset_ID, Bifrost_Hash
* Output: Settlement Confirmation Event or Error
*
* This is the main entry point for settlement requests from the hub
P SEB_Fiscal_Settlement...
P B EXPORT
D SEB_Fiscal_Settlement...
D PI
D pi_agent_id 16A CONST
D pi_amount 18P 0 CONST
D pi_asset_id 32A CONST
D pi_bifrost_hash 128A CONST
D po_settlement_id 128A
D po_error_msg 256A
D l_envelope DS QUALIFIED
D sb_offset 1 8I 0
D sb_timestamp 9 34A
D sb_agent_id 35 50A
D sb_event_type 51 60A
D sb_payload_size 61 64I 0
D sb_reserved 65 76A
D sb_prev_hash 77 108A
D sb_event_hash 109 140A
D sb_signature 141 204A
D l_payload S 2048A VARYING
D l_seb_offset S 10I 0
D l_error_code S 10I 0
D l_settlement_payload S 2048A VARYING
D l_timestamp S 26A
D l_hash S 64A
D l_hash_obj S 16A
D l_hash_result S 32A
D l_json_buffer S 4096A VARYING
BEGIN
* Validate inputs
IF pi_amount <= 0;
po_error_msg = 'SEB_FISCAL_ADAPTER: Settlement amount must be '
+ 'positive';
RETURN;
ENDIF;
IF pi_bifrost_hash = '';
po_error_msg = 'SEB_FISCAL_ADAPTER: Bifrost_Hash required for '
+ 'idempotency';
RETURN;
ENDIF;
* Check for duplicate settlement (idempotency)
EXSR check_duplicate_settlement;
IF g_settlement_error = '1';
po_error_msg = 'SEB_FISCAL_ADAPTER: Settlement already processed '
+ 'for this Bifrost_Hash';
RETURN;
ENDIF;
* Generate timestamp (ISO-8601 UTC)
EXSR generate_iso_timestamp;
* Build settlement event payload (JSON format)
EXSR build_settlement_payload;
* Build SEB envelope header
l_envelope.sb_offset = 0; * Will be assigned by SEB kernel
l_envelope.sb_timestamp = l_timestamp;
l_envelope.sb_agent_id = g_agent_id;
l_envelope.sb_event_type = 'SETTLEMENT';
l_envelope.sb_payload_size = %LEN(%TRIM(l_settlement_payload));
l_envelope.sb_reserved = '';
* Append event to SEB chain (WORM sealed)
EXSR append_to_seb_chain;
IF l_error_code <> 0;
po_error_msg = 'SEB_FISCAL_ADAPTER: Failed to append event to '
+ 'SEB chain (error code: '
+ %CHAR(l_error_code) + ')';
RETURN;
ENDIF;
* Insert settlement into SOVEREIGN_LEDGER (idempotent on Bifrost_Hash)
EXSR insert_into_ledger;
IF l_error_code <> 0;
po_error_msg = 'SEB_FISCAL_ADAPTER: Failed to insert into '
+ 'SOVEREIGN_LEDGER (error code: '
+ %CHAR(l_error_code) + ')';
RETURN;
ENDIF;
* Emit Settlement Confirmation Event back into SEB
EXSR emit_confirmation_event;
IF l_error_code <> 0;
po_error_msg = 'SEB_FISCAL_ADAPTER: Failed to emit confirmation '
+ 'event (error code: '
+ %CHAR(l_error_code) + ')';
RETURN;
ENDIF;
* Call SEB_Kernel_Append_Event NIF to register confirmation
EXSR call_seb_kernel_nif;
* Return settlement ID (which is the SEB offset)
po_settlement_id = %CHAR(l_seb_offset);
po_error_msg = 'SUCCESS';
END-PROC SEB_Fiscal_Settlement;
* ================================================================
* SUBROUTINE: Check for Duplicate Settlement
* ================================================================
C check_duplicate_settlement...
C BEGSR
D l_ledger_status S 1
D l_ledger_offset S 10I 0
D l_sqlcode S 5I 0
* Query SOVEREIGN_LEDGER for existing settlement with this Bifrost_Hash
EXEC SQL
SELECT SETTLEMENT_STATUS, SEB_OFFSET
INTO :l_ledger_status, :l_ledger_offset
FROM SOVEREIGN_LEDGER
WHERE BIFROST_HASH = :pi_bifrost_hash
AND SETTLEMENT_STATUS IN ('SUCCESS', 'PENDING')
FETCH FIRST 1 ROW ONLY;
l_sqlcode = SQLCODE;
IF l_sqlcode = 0;
* Settlement already exists
g_settlement_error = '1';
g_seb_chain_offset = l_ledger_offset;
ELSE;
* No duplicate found
g_settlement_error = '0';
ENDIF;
C ENDSR;
* ================================================================
* SUBROUTINE: Generate ISO-8601 Timestamp
* ================================================================
C generate_iso_timestamp...
C BEGSR
D l_now S Z INZ(*SYS)
D l_year S 4 0
D l_month S 2 0
D l_day S 2 0
D l_hour S 2 0
D l_minute S 2 0
D l_second S 2 0
D l_millis S 3 0
* Get current time in UTC
l_now = %TIMESTAMP();
* Extract components
l_year = %YEAR(l_now);
l_month = %MONTH(l_now);
l_day = %DAY(l_now);
l_hour = %HOUR(l_now);
l_minute = %MINUTE(l_now);
l_second = %SECOND(l_now);
l_millis = %MILLISECOND(l_now);
* Format: YYYY-MM-DDTHH:MM:SS.sssZ
l_timestamp = %EDITC(l_year : '0 ') + '-'
+ %EDITC(l_month : '0 ') + '-'
+ %EDITC(l_day : '0 ') + 'T'
+ %EDITC(l_hour : '0 ') + ':'
+ %EDITC(l_minute : '0 ') + ':'
+ %EDITC(l_second : '0 ') + '.'
+ %EDITC(l_millis : '0 ') + 'Z';
C ENDSR;
* ================================================================
* SUBROUTINE: Build Settlement Payload (JSON)
* ================================================================
C build_settlement_payload...
C BEGSR
* Build JSON payload with settlement details
l_settlement_payload = '{'
+ '"intent": {'
+ '"action": "settle_fiscal",'
+ '"subject": "' + %TRIM(pi_asset_id) + '",'
+ '"parameters": {'
+ '"amount": ' + %CHAR(pi_amount) + ','
+ '"currency": "USD"'
+ '}'
+ '},'
+ '"context": {'
+ '"environment": "production",'
+ '"constraints": {'
+ '"network": "restricted",'
+ '"max_runtime_ms": 30000,'
+ '"max_memory_bytes": 10485760'
+ '}'
+ '},'
+ '"authority": {'
+ '"principal": "' + %TRIM(pi_agent_id) + '",'
+ '"credentials": {'
+ '"credential_type": "agent_signature"'
+ '},'
+ '"scope": ["settle_fiscal"]'
+ '},'
+ '"evidence": ['
+ '{'
+ '"evidence_type": "bifrost_hash",'
+ '"hash": "' + %TRIM(pi_bifrost_hash) + '"'
+ '}'
+ ']'
+ '}';
C ENDSR;
* ================================================================
* SUBROUTINE: Append Event to SEB Chain (WORM Sealed)
* ================================================================
C append_to_seb_chain...
C BEGSR
* Call SEB_Append_Event NIF (external interface)
* The kernel handles cryptographic sealing via Blake3+Ed25519
CALL 'SEB_APPEND'
PARM l_envelope
PARM l_settlement_payload
PARM l_seb_offset
PARM l_error_code;
C ENDSR;
* ================================================================
* SUBROUTINE: Insert into SOVEREIGN_LEDGER (Idempotent)
* ================================================================
C insert_into_ledger...
C BEGSR
D l_sqlcode S 5I 0
D l_settlement_id S 128A
D l_timestamp_ins S Z
l_timestamp_ins = %TIMESTAMP();
l_settlement_id = %CHAR(l_seb_offset);
* Attempt INSERT (will fail if Bifrost_Hash exists)
* Use INSERT IGNORE or ON CONFLICT behavior for idempotency
EXEC SQL
INSERT INTO SOVEREIGN_LEDGER (
SETTLEMENT_ID,
BIFROST_HASH,
AGENT_ID,
AMOUNT,
ASSET_ID,
SEB_OFFSET,
SETTLEMENT_STATUS,
CREATED_AT,
UPDATED_AT,
EVENT_HASH,
SIGNATURE
) VALUES (
:l_settlement_id,
:pi_bifrost_hash,
:pi_agent_id,
:pi_amount,
:pi_asset_id,
:l_seb_offset,
'SUCCESS',
:l_timestamp_ins,
:l_timestamp_ins,
:l_hash,
''
)
ON CONFLICT (BIFROST_HASH) DO NOTHING;
l_sqlcode = SQLCODE;
IF l_sqlcode <> 0 AND l_sqlcode <> 100;
* SQL error occurred (not "no rows found")
l_error_code = l_sqlcode;
ELSE;
* Either inserted successfully or already existed (idempotency)
l_error_code = 0;
ENDIF;
C ENDSR;
* ================================================================
* SUBROUTINE: Emit Settlement Confirmation Event
* ================================================================
C emit_confirmation_event...
C BEGSR
D l_conf_envelope DS QUALIFIED
D sb_offset 1 8I 0
D sb_timestamp 9 34A
D sb_agent_id 35 50A
D sb_event_type 51 60A
D sb_payload_size 61 64I 0
D sb_reserved 65 76A
D sb_prev_hash 77 108A
D sb_event_hash 109 140A
D sb_signature 141 204A
D l_conf_payload S 1024A VARYING
* Build confirmation event payload
l_conf_payload = '{'
+ '"settlement_id": "' + %TRIM(l_settlement_id) + '",'
+ '"bifrost_hash": "' + %TRIM(pi_bifrost_hash) + '",'
+ '"status": "CONFIRMED",'
+ '"seb_offset": ' + %CHAR(l_seb_offset)
+ '}';
* Build confirmation envelope
l_conf_envelope.sb_offset = 0;
l_conf_envelope.sb_timestamp = l_timestamp;
l_conf_envelope.sb_agent_id = g_agent_id;
l_conf_envelope.sb_event_type = 'CONFIRM';
l_conf_envelope.sb_payload_size = %LEN(%TRIM(l_conf_payload));
l_conf_envelope.sb_reserved = '';
* Append confirmation to SEB chain
CALL 'SEB_APPEND'
PARM l_conf_envelope
PARM l_conf_payload
PARM g_seb_chain_offset
PARM l_error_code;
C ENDSR;
* ================================================================
* SUBROUTINE: Call SEB_Kernel_Append_Event NIF
* ================================================================
C call_seb_kernel_nif...
C BEGSR
* This subroutine would call the native interface to the Rust kernel
* For now, it's a placeholder - the actual NIF would be loaded
* via CALL 'SEB_KERNEL_NIF' with appropriate parameters
* The kernel is responsible for:
* 1. Final Blake3 hash verification
* 2. Ed25519 signature validation
* 3. Chain integrity checks
* 4. Conflict resolution for parallel appends
l_error_code = 0; * Assume success for now
C ENDSR;
* ================================================================
* Exported Procedure: Settlement Error Handler
* ================================================================
P SEB_Settlement_Error...
P B EXPORT
D SEB_Settlement_Error...
D PI
D pi_settlement_id 128A CONST
D pi_error_code 5I 0 CONST
D pi_error_msg 512A CONST
D po_retry_offset 10I 0
D l_error_envelope DS QUALIFIED
D sb_offset 1 8I 0
D sb_timestamp 9 34A
D sb_agent_id 35 50A
D sb_event_type 51 60A
D sb_payload_size 61 64I 0
D sb_reserved 65 76A
D sb_prev_hash 77 108A
D sb_event_hash 109 140A
D sb_signature 141 204A
D l_error_payload S 1024A VARYING
D l_seb_offset S 10I 0
D l_error_seb S 10I 0
BEGIN
* Build error event payload
l_error_payload = '{'
+ '"settlement_id": "' + %TRIM(pi_settlement_id) + '",'
+ '"error_code": ' + %CHAR(pi_error_code) + ','
+ '"error_msg": "' + %TRIM(pi_error_msg) + '",'
+ '"timestamp": "' + l_timestamp + '"'
+ '}';
* Build error envelope
l_error_envelope.sb_event_type = 'ERROR';
l_error_envelope.sb_agent_id = g_agent_id;
* Append error event to SEB
CALL 'SEB_APPEND'
PARM l_error_envelope
PARM l_error_payload
PARM l_seb_offset
PARM l_error_seb;
* Return offset for retry tracking
po_retry_offset = l_seb_offset;
END-PROC SEB_Settlement_Error;
* ================================================================
* End of Module
* ================================================================
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