271 lines
29 KiB
Markdown
271 lines
29 KiB
Markdown
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### Queue-Based Data Synchronization: Understanding `queueSync` Object
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The provided JavaScript object, `queueSync`, encapsulates a queue-based data synchronization mechanism used in a blockchain or distributed system. This synchronization method ensures orderly and efficient synchronization of blocks between nodes. Let's delve into the key components and functionalities of the `queueSync` object:
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#### Object Structure:
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- **Properties:**
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- **`list`:** A dictionary that maintains synchronization states for different nodes. Each node's synchronization state includes information about the WebSocket connection (`ws`), timestamps, a queue of blocks to sync (`q`), currently syncing blocks (`cur`), verified blocks (`ver`), and block hashes (`hashes`).
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#### Core Functionalities:
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- **Initialization (`init` Method):**
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- The `init` method initializes the synchronization process for a specific node (`node_i`). It creates a synchronization state entry in the `list` dictionary and triggers the synchronization by requesting block hashes from the node.
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- **Adding Blocks to Sync (`add_block` Method):**
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- The `add_block` method adds a block (`block_n`) to the synchronization queue for a specific node (`node_i`). If the node is already syncing blocks, the new block is queued; otherwise, it initiates the synchronization of the block.
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- **Ending Block Sync (`end_block` Method):**
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- The `end_block` method marks the completion of syncing a specific block (`block_n`) for a node (`node_i`). It updates the synchronization state, verifying the block's hash after a timeout. If the hash verification fails, the block is resynced.
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- **Handling Last Block (`last_block` Method):**
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- The `last_block` method indicates the last block (`block_n`) for a node (`node_i`). It sets up an interval to continuously check if all blocks have been synced and verified. Once synchronization is complete, it removes the synchronization state entry and triggers the ordering of the next backup node.
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#### Synchronization Workflow:
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1. **Initialization:** The synchronization process begins with the `init` method, initiating the synchronization state for a specific node.
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2. **Adding Blocks:** Blocks are added to the synchronization queue using the `add_block` method, ensuring orderly processing.
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3. **Syncing Blocks:** Blocks in the queue are processed and synchronized using the `cur` set, ensuring one block is synced at a time.
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4. **Verification:** After syncing, blocks are verified using their hashes, ensuring data integrity.
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5. **Completion:** When all blocks are synced, verified, and the queue is empty, the synchronization process is marked as complete.
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6. **Ordering:** After synchronization, the object signals the next backup node to order blocks.
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#### Usage Considerations:
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- **Efficiency:** The queue-based approach ensures efficient synchronization, allowing nodes to process blocks sequentially without overwhelming network resources.
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- **Error Handling:** The mechanism includes error handling, such as hash verification, ensuring data integrity during the synchronization process.
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- **Orderly Processing:** Blocks are synchronized and verified in an orderly manner, preventing race conditions and data inconsistencies.
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In summary, the `queueSync` object provides a structured and systematic approach to data synchronization between nodes in a distributed system. By ensuring order, efficiency, and integrity, this mechanism contributes to the reliability and consistency of the blockchain network.
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### Requesting Data Synchronization: Understanding `requestDataSync` Function
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The `requestDataSync` function plays a pivotal role in initiating the data synchronization process for a specific node (`node_i`). By invoking the `init` method of the `queueSync` object, this function triggers the synchronization workflow, ensuring the orderly and efficient synchronization of blocks between nodes.
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#### Function Overview:
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- **Function Name:** `requestDataSync(node_i, ws)`
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- **Parameters:**
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- **`node_i` (String):** Identifier of the node for which data synchronization is requested.
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- **`ws` (WebSocket):** WebSocket connection object representing the communication channel with the specified node.
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- **Functionality:**
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- The `requestDataSync` function is responsible for initiating the data synchronization process for a targeted node in a distributed system.
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- It utilizes the `init` method of the `queueSync` object, which sets up the synchronization state, initiates the synchronization process, and handles the sequential syncing of blocks.
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#### Key Considerations:
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- **Targeted Synchronization:** The function enables selective synchronization by specifying the target node (`node_i`), allowing precise control over which node's data is synchronized.
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- **WebSocket Connection:** The function relies on a WebSocket connection (`ws`) to establish communication with the specified node, facilitating the exchange of synchronization-related messages.
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#### Workflow Summary:
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1. **Initialization:** The function triggers the `init` method of the `queueSync` object, initializing the synchronization process for the specified node (`node_i`).
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2. **Synchronization Setup:** The `init` method sets up the synchronization state, including the WebSocket connection and synchronization-related data structures.
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3. **Block Synchronization:** Blocks are sequentially added to the synchronization queue and processed, ensuring a methodical synchronization process.
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4. **Data Integrity:** During synchronization, block hashes are verified to maintain data integrity and consistency.
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5. **Completion:** Once all blocks are successfully synchronized and verified, the synchronization process is marked as complete.
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In essence, the `requestDataSync` function serves as a catalyst for data synchronization, facilitating the seamless exchange of blockchain blocks between nodes. Its targeted and systematic approach ensures the accuracy and reliability of synchronized data, contributing to the overall robustness of the distributed system.
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### Sending Block Hashes: Understanding `sendBlockHashes` Function
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The `sendBlockHashes` function serves as a critical component in the process of sharing block hashes with a designated node (`node_i`). By extracting block hashes from the local database and sending them via a WebSocket connection (`ws`), this function ensures the accurate transmission of blockchain data between nodes.
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#### Function Overview:
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- **Function Name:** `sendBlockHashes(node_i, ws)`
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- **Parameters:**
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- **`node_i` (String):** Identifier of the node for which block hashes are being sent.
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- **`ws` (WebSocket):** WebSocket connection object representing the communication channel with the specified node.
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- **Functionality:**
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- The `sendBlockHashes` function retrieves block hashes from the local database corresponding to the specified node (`node_i`).
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- Block hashes are transmitted in a sequential manner to the target node via the provided WebSocket connection (`ws`).
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- The function includes error handling mechanisms to address potential database querying issues and ensure reliable transmission.
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#### Key Considerations:
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- **Database Querying:** The function performs a database query to extract block hashes, utilizing the appropriate SQL statements and database table structures.
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- **Sequential Transmission:** Block hashes are sent one at a time in a sequential manner, ensuring systematic and organized transmission.
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- **Validation:** The transmitted block hashes are validated by the receiving node to maintain data integrity and consistency across the distributed system.
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- **Acknowledgment:** The receiving node is expected to acknowledge the receipt of block hashes, confirming successful data transmission.
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#### Workflow Summary:
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1. **Database Query:** The function executes a database query to fetch block hashes corresponding to the specified node (`node_i`).
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2. **Transmission:** Block hashes are sent sequentially to the target node (`node_i`) through the WebSocket connection (`ws`).
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3. **Acknowledgment:** The receiving node acknowledges the receipt of block hashes, confirming the successful transmission and enabling further synchronization processes.
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The `sendBlockHashes` function plays a crucial role in the blockchain synchronization process, ensuring the accurate exchange of block data between nodes. Its organized and methodical approach supports the reliability and consistency of blockchain data, contributing to the overall stability of the distributed network.
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### Verifying Block Hashes and Handling Hash Mismatches: Understanding `checkBlockHash` Function
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The `checkBlockHash` function is a vital component of the blockchain synchronization process, ensuring data integrity by verifying the received block hash (`hash`). When a hash mismatch occurs, indicating a potential inconsistency in the data, the function takes proactive measures to request the corresponding block data for re-synchronization. This function is crucial for maintaining the accuracy and reliability of blockchain data across distributed nodes.
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#### Function Overview:
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- **Function Name:** `checkBlockHash(node_i, block_n, hash)`
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- **Parameters:**
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- **`node_i` (String):** Identifier of the node for which the block hash is being checked.
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- **`block_n` (Integer):** Block number corresponding to the hash being verified.
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- **`hash` (String):** Hash value of the block data received from the specified node (`node_i`).
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- **Functionality:**
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- The `checkBlockHash` function verifies the received block hash (`hash`) for a specific block number (`block_n`) of the specified node (`node_i`).
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- If the hash verification indicates a mismatch, implying a potential data inconsistency, the function triggers a request to the source node (`node_i`) for re-synchronization of the corresponding block data.
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- The function utilizes the `verifyBlockHash` function to perform hash verification, ensuring accuracy in the comparison process.
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- Error handling mechanisms are in place to manage potential errors that might occur during hash verification or the re-synchronization request process.
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#### Key Considerations:
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- **Hash Verification:** The function verifies the received block hash (`hash`) against the calculated hash of the corresponding block data, ensuring data integrity.
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- **Resynchronization:** In the event of a hash mismatch, the function proactively triggers a re-synchronization request for the specific block data, enabling the correction of potential inconsistencies.
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- **Asynchronous Processing:** Asynchronous operations, facilitated through promises, allow the function to handle hash verification and re-synchronization requests efficiently and non-blocking.
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- **Error Handling:** The function incorporates error handling mechanisms to address potential errors arising during hash verification or the re-synchronization process, enhancing the reliability of the synchronization mechanism.
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#### Workflow Summary:
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1. **Hash Verification:** The function initiates hash verification for the received block hash (`hash`) associated with the specified block number (`block_n`) and node (`node_i`).
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2. **Mismatch Detection:** If a hash mismatch is detected during verification, indicating a potential data inconsistency, the function takes corrective action.
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3. **Re-Synchronization Request:** A re-synchronization request is triggered by adding the specific block number and its mismatched hash to the synchronization queue, enabling the source node (`node_i`) to send the correct block data for synchronization.
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4. **Error Handling:** The function incorporates error handling mechanisms to manage any errors that might occur during hash verification or the re-synchronization request process, ensuring the reliability of the synchronization mechanism.
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The `checkBlockHash` function plays a crucial role in maintaining the integrity of blockchain data by promptly identifying and addressing hash mismatches. Its proactive approach to requesting re-synchronization ensures the consistency and accuracy of data across distributed nodes, contributing significantly to the stability and reliability of the blockchain network.
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### Verifying Block Hashes: Understanding `verifyBlockHash` Function
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The `verifyBlockHash` function is a critical component of the blockchain synchronization process, ensuring data integrity by verifying the hash of a specific block against its stored hash value in the database. This function plays a fundamental role in maintaining the accuracy and consistency of blockchain data across distributed nodes. Here's an overview of its functionality and key considerations:
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#### Function Overview:
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- **Function Name:** `verifyBlockHash(node_i, block_n, hash)`
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- **Parameters:**
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- **`node_i` (String):** Identifier of the node for which the block hash is being verified.
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- **`block_n` (Integer):** Block number corresponding to the hash being verified.
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- **`hash` (String):** Hash value of the block data received from the node (`node_i`).
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- **Functionality:**
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- The `verifyBlockHash` function compares the received hash (`hash`) against the stored hash value of the specified block number (`block_n`) for the given node (`node_i`).
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- If the received hash matches the stored hash value, indicating data integrity, the function resolves the promise with `true`.
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- If the received hash does not match the stored hash value or the specified block number is not found, indicating a hash mismatch, the function resolves the promise with `false`.
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- In case of a hash mismatch, the `verifyBlockHash` function can trigger corrective actions, such as initiating a re-synchronization request for the specific block data.
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#### Key Considerations:
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- **Hash Verification:** The function performs hash verification by comparing the received hash (`hash`) with the stored hash value of the specified block number in the database.
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- **Data Integrity:** Successful hash verification ensures the integrity of the received block data, indicating that the data has not been tampered with during transmission.
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- **Promise-Based:** The function is implemented as a Promise, allowing for asynchronous execution and seamless integration into other asynchronous processes within the blockchain synchronization mechanism.
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- **Hash Mismatch Handling:** In the event of a hash mismatch, the function can be integrated with processes that handle re-synchronization requests or other corrective actions to resolve data inconsistencies.
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#### Workflow Summary:
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1. **Hash Retrieval:** The function retrieves the stored hash value of the specified block number (`block_n`) for the given node (`node_i`) from the database.
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2. **Hash Comparison:** The received hash (`hash`) is compared with the stored hash value. If they match, the data integrity is confirmed, and the function resolves the promise with `true`.
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3. **Mismatch Detection:** If the received hash does not match the stored hash value or the specified block number is not found, indicating a hash mismatch, the function resolves the promise with `false`.
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4. **Hash Mismatch Actions:** Depending on the application's logic, the function can be configured to trigger actions in response to hash mismatches, such as initiating re-synchronization requests or performing other corrective measures.
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The `verifyBlockHash` function is a foundational element in blockchain systems, ensuring the trustworthiness of data by verifying the authenticity of received block hashes. Its seamless integration with the synchronization process contributes to the overall reliability and security of blockchain networks.
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### Setting Last Block Number: Understanding `setLastBlock` Function
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The `setLastBlock` function is a crucial component of the blockchain synchronization process, responsible for updating and tracking the last synchronized block number for a specific node. By setting the last block number, the function helps manage the progress of block synchronization and ensures that nodes remain up-to-date with the latest blockchain data. Here's a detailed overview of its functionality and key considerations:
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#### Function Overview:
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- **Function Name:** `setLastBlock(node_i, block_n)`
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- **Parameters:**
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- **`node_i` (String):** Identifier of the node for which the last synchronized block number is being set.
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- **`block_n` (Integer):** Block number indicating the last synchronized block for the specified node.
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- **Functionality:**
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- The `setLastBlock` function updates the last synchronized block number for the specified node (`node_i`) to the provided block number (`block_n`).
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- Setting the last block number is essential for tracking the progress of blockchain synchronization, indicating up to which block the node's data is synchronized with the network.
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- The function internally calls the `queueSync.last_block(node_i, block_n)` method, which manages the synchronization queue and initiates ordering processes after completing the synchronization of specific blocks.
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#### Key Considerations:
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- **Progress Tracking:** By updating the last synchronized block number, the function allows the system to track the progress of blockchain synchronization for individual nodes.
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- **Queue Management:** The function's integration with the `queueSync` module ensures effective management of block synchronization queues, enabling seamless handling of multiple nodes' synchronization processes.
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- **Ordering Initiation:** After completing the synchronization of specific blocks, the function triggers the initiation of ordering processes, ensuring that the synchronized data is appropriately integrated into the blockchain network.
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#### Workflow Summary:
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1. **Block Number Update:** The function receives the latest synchronized block number (`block_n`) for the specified node (`node_i`).
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2. **Queue Management:** Internally, the function calls the `queueSync.last_block(node_i, block_n)` method, which manages the synchronization queue and completes the synchronization process for the specified block.
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3. **Ordering Initiation:** After synchronizing the block, the function initiates ordering processes to ensure that the synchronized data is incorporated into the blockchain network seamlessly.
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The `setLastBlock` function plays a vital role in maintaining synchronization progress, ensuring that nodes remain current with the latest blockchain data. Its integration with queue management and ordering processes enhances the overall efficiency and reliability of blockchain synchronization within distributed networks.
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### Sending Data for a Specific Block: Understanding `sendBlockData` Function
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The `sendBlockData` function plays a critical role in the blockchain synchronization process, enabling the transmission of specific block data from one node to another. This function is essential for ensuring that nodes within a distributed network are updated with the latest blockchain information. Here's a comprehensive overview of the `sendBlockData` function, outlining its functionality and key aspects:
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#### Function Overview:
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- **Function Name:** `sendBlockData(node_i, block_n, ws)`
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- **Parameters:**
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- **`node_i` (String):** Identifier of the node from which block data is being sent.
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- **`block_n` (Integer):** Block number indicating the specific block whose data is being transmitted.
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- **`ws` (WebSocket):** WebSocket connection representing the recipient node to which the block data is sent.
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- **Functionality:**
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- The `sendBlockData` function initiates the process of sending block data (`block_n`) from a specified node (`node_i`) to a target node represented by the WebSocket connection (`ws`).
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- The function begins by indicating the start of the data transmission for the specific block (`node_i`, `block_n`) to the recipient node using the `TYPE_.INDICATE_BLK` message type.
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- Subsequently, the function queries the database to retrieve the data associated with the specified block (`block_n`) from the table named `${t_name}`, where `${t_name}` represents the table associated with the node (`node_i`).
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- The retrieved block data is then transmitted to the recipient node (`ws`) using the `TYPE_.STORE_BACKUP_DATA` message type, allowing the recipient node to receive and store the blockchain data.
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- Upon completing the data transmission, the function sends an indication to the recipient node, marking the end of the data transmission process for the specific block (`node_i`, `block_n`).
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#### Key Considerations:
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- **Block Data Transmission:** The function facilitates the transmission of individual block data from one node to another, ensuring that nodes remain synchronized with the latest blockchain information.
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- **Data Indication:** The function utilizes the `TYPE_.INDICATE_BLK` message type to indicate the start and end of the data transmission process, allowing recipient nodes to identify the boundaries of the transmitted data.
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- **WebSocket Connection:** The `ws` parameter represents the WebSocket connection to the recipient node, enabling direct communication between nodes within the distributed network.
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#### Workflow Summary:
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1. **Indicate Data Transmission:** The function initiates the data transmission process by sending an indication (`TYPE_.INDICATE_BLK`) to the recipient node (`ws`), marking the start of the transmission for the specific block (`node_i`, `block_n`).
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2. **Retrieve Block Data:** The function queries the database to retrieve the block data associated with the specified block number (`block_n`) from the corresponding table (`${t_name}`) associated with the node (`node_i`).
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3. **Transmit Block Data:** The retrieved block data is transmitted to the recipient node (`ws`) using the `TYPE_.STORE_BACKUP_DATA` message type, allowing the recipient node to receive and store the transmitted blockchain data.
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4. **End Data Transmission:** After completing the data transmission, the function sends an indication (`TYPE_.INDICATE_BLK`) to the recipient node, marking the end of the transmission process for the specific block (`node_i`, `block_n`).
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The `sendBlockData` function serves as a pivotal component in maintaining blockchain synchronization, facilitating the seamless exchange of specific block data between nodes. Its integration with WebSocket connections and data indication mechanisms ensures efficient and reliable transmission of blockchain information within the distributed network.
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### Ending Block Synchronization: Understanding `endBlockSync` Function
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The `endBlockSync` function plays a vital role in the blockchain synchronization process, specifically focusing on concluding the synchronization of a particular block between nodes. This function is crucial for ensuring that nodes within a distributed network successfully complete the synchronization of specific blocks, maintaining consistency across the blockchain. Here's a detailed overview of the `endBlockSync` function, highlighting its functionality and key aspects:
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#### Function Overview:
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- **Function Name:** `endBlockSync(node_i, block_n)`
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- **Parameters:**
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- **`node_i` (String):** Identifier of the node for which block synchronization is being completed.
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- **`block_n` (Integer):** Block number indicating the specific block for which synchronization is being finalized.
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- **Functionality:**
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- The `endBlockSync` function is responsible for concluding the synchronization process of a particular block (`block_n`) for the specified node (`node_i`).
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- Upon invocation, the function communicates with the synchronization queue (`queueSync`) to mark the completion of the synchronization process for the specified block.
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- The function ensures that the synchronization queue is updated, indicating that the block synchronization has been successfully finalized for the specified node and block number.
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- By invoking `queueSync.end_block(node_i, block_n)`, the function triggers the necessary actions within the synchronization queue to manage the completion of the synchronization process.
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#### Key Considerations:
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- **Block Synchronization Completion:** The primary purpose of the `endBlockSync` function is to indicate the successful completion of the synchronization process for a specific block (`block_n`) belonging to a particular node (`node_i`).
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- **QueueSync Interaction:** The function interacts with the `queueSync` object, a critical component responsible for managing the synchronization queue, ensuring that the synchronization process progresses efficiently and accurately.
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- **Synchronization Queue Management:** The function's invocation triggers internal mechanisms within the `queueSync` object, allowing it to handle the completion of the synchronization process, update internal states, and proceed with the next synchronization tasks if applicable.
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#### Workflow Summary:
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1. **Synchronization Completion:** The function signifies the successful synchronization completion of a specific block (`block_n`) for the designated node (`node_i`).
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2. **QueueSync Interaction:** The function communicates with the `queueSync` object, specifically invoking the `queueSync.end_block(node_i, block_n)` method to manage the completion of the synchronization process for the specified block.
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3. **Internal Queue Handling:** Within the `queueSync` object, the completion of the synchronization process triggers internal mechanisms to handle the completed block, update internal states, and prepare for subsequent synchronization tasks if additional blocks are pending synchronization.
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The `endBlockSync` function serves as a crucial step in the synchronization process, ensuring that specific blocks are synchronized successfully and accurately between nodes within the distributed blockchain network. Its seamless interaction with the synchronization queue enables efficient management of block synchronization, contributing to the overall consistency and integrity of the blockchain network.
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### Synchronization Indicator Function: Understanding `syncIndicator`
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The `syncIndicator` function plays a crucial role in the blockchain synchronization process, providing insights into the progress and completion of block synchronization between nodes. This function is responsible for indicating the start and end of the synchronization process for a specific block, enabling effective monitoring and management of blockchain synchronization. Here's a detailed overview of the `syncIndicator` function, highlighting its functionality and key aspects:
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#### Function Overview:
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- **Function Name:** `syncIndicator(node_i, block_n, status, from)`
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- **Parameters:**
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- **`node_i` (String):** Identifier of the node associated with the synchronization process.
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- **`block_n` (Integer):** Block number indicating the specific block involved in synchronization.
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- **`status` (Boolean):** Status indicating whether the synchronization process is starting (`true`) or ending (`false`).
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- **`from` (String):** Identifier of the node from which the synchronization data is received.
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- **Functionality:**
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- The `syncIndicator` function is responsible for logging synchronization events, specifically indicating the initiation (`status: true`) and completion (`status: false`) of the synchronization process for a specific block.
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- When the `status` parameter is `true`, the function logs the start of the synchronization process, providing details such as the node identifier (`node_i`), block number (`block_n`), and the source node (`from`) from which the synchronization data is received.
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- When the `status` parameter is `false`, signifying the end of the synchronization process, the function invokes the `endBlockSync` function to indicate the successful completion of block synchronization for the specified block (`block_n`) and node (`node_i`).
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- The function's logging mechanism ensures that synchronization events are recorded, enabling real-time monitoring and analysis of blockchain synchronization activities.
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#### Key Considerations:
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- **Synchronization Progress Logging:** The function logs synchronization events, providing valuable information about the progress of the synchronization process, including the involved nodes, block numbers, and synchronization status.
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- **Dynamic Synchronization Monitoring:** By capturing synchronization events dynamically, the function allows developers and administrators to monitor synchronization activities in real-time, facilitating rapid response to synchronization issues or anomalies.
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- **Integration with `endBlockSync`:** The function collaborates with the `endBlockSync` function, which is invoked when the synchronization process is successfully completed (`status: false`). This integration ensures that the synchronization queue is managed appropriately upon completion of synchronization activities.
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#### Workflow Summary:
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1. **Synchronization Initiation:** When the `status` parameter is `true`, the function logs the start of the synchronization process, capturing details such as the node identifier, block number, and source node.
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2. **Synchronization Completion:** When the `status` parameter is `false`, indicating the end of the synchronization process, the function invokes the `endBlockSync` function. This action signifies the successful completion of block synchronization for the specified block and node.
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3. **Real-time Monitoring:** The function's logging mechanism enables real-time monitoring of synchronization events, allowing stakeholders to track the progress of blockchain synchronization activities, identify potential issues, and ensure the integrity of the distributed network.
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The `syncIndicator` function serves as a critical component in the blockchain synchronization process, offering essential insights into synchronization events and contributing to the overall reliability and stability of the blockchain network.
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