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https://github.com/EvernodeXRPL/sashimono.git
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Introduce message threads and message handling (#4)
This commit is contained in:
Chalith Desaman
252
src/msg/json/msg_json.cpp
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252
src/msg/json/msg_json.cpp
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#include "msg_json.hpp"
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namespace msg::json
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{
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// JSON separators
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constexpr const char *SEP_COMMA = "\",\"";
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constexpr const char *SEP_COLON = "\":\"";
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constexpr const char *SEP_COMMA_NOQUOTE = ",\"";
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constexpr const char *SEP_COLON_NOQUOTE = "\":";
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constexpr const char *DOUBLE_QUOTE = "\"";
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/**
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* Parses a json message sent by the message board.
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* @param d Jsoncons document to which the parsed json should be loaded.
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* @param message The message to parse.
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* Accepted message format:
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* {
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* 'type': '<message type>'
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* ...
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* }
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* @return 0 on successful parsing. -1 for failure.
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*/
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int parse_message(jsoncons::json &d, std::string_view message)
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{
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try
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{
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d = jsoncons::json::parse(message, jsoncons::strict_json_parsing());
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}
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catch (const std::exception &e)
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{
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LOG_ERROR << "JSON message parsing failed. " << e.what();
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return -1;
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}
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// Check existence of msg type field.
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if (!d.contains(msg::FLD_TYPE) || !d[msg::FLD_TYPE].is<std::string>())
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{
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LOG_ERROR << "JSON message 'type' missing or invalid.";
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return -1;
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}
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return 0;
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}
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/**
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* Extracts the message 'type' value from the json document.
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*/
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int extract_type(std::string &extracted_type, const jsoncons::json &d)
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{
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extracted_type = d[msg::FLD_TYPE].as<std::string>();
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return 0;
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}
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/**
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* Extracts type, id and pubkey in the msg.
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* @param type Type in the message.
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* @param id id in the message.
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* @param pubkey Pubkey in the message.
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* @param d The json document holding the read request message.
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* Accepted signed input container format:
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* {
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* ...
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* "type": "<message type>",
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* "id": "<message id>",
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* "owner_pubkey": "<pubkey of the owner>",
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* ...
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* }
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* @return 0 on successful extraction. -1 for failure.
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*/
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int extract_commons(std::string &type, std::string &id, std::string &pubkey, const jsoncons::json &d)
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{
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if (extract_type(type, d) == -1)
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return -1;
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if (!d.contains(msg::FLD_ID))
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{
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LOG_ERROR << "Field id is missing.";
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return -1;
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}
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if (!d[msg::FLD_ID].is<std::string>())
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{
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LOG_ERROR << "Invalid id value.";
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return -1;
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}
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if (!d.contains(msg::FLD_PUBKEY))
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{
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LOG_ERROR << "Field owner_pubkey is missing.";
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return -1;
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}
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if (!d[msg::FLD_PUBKEY].is<std::string>())
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{
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LOG_ERROR << "Invalid owner_pubkey value.";
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return -1;
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}
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id = d[msg::FLD_ID].as<std::string>();
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pubkey = d[msg::FLD_PUBKEY].as<std::string>();
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return 0;
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}
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/**
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* Extracts create message from msg.
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* @param msg Populated msg object.
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* @param d The json document holding the read request message.
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* Accepted signed input container format:
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* {
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* "type": "create",
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* "owner_pubkey": "<pubkey of the owner>"
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* }
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* @return 0 on successful extraction. -1 for failure.
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*/
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int extract_create_message(create_msg &msg, const jsoncons::json &d)
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{
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if (extract_commons(msg.type, msg.id, msg.pubkey, d) == -1)
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return -1;
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return 0;
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}
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/**
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* Extracts destroy message from msg.
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* @param msg Populated msg object.
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* @param d The json document holding the read request message.
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* Accepted signed input container format:
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* {
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* "type": "destroy",
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* "owner_pubkey": "<pubkey of the owner>",
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* "contract_id": "<contract id>",
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* }
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* @return 0 on successful extraction. -1 for failure.
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*/
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int extract_destroy_message(destroy_msg &msg, const jsoncons::json &d)
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{
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if (extract_commons(msg.type, msg.id, msg.pubkey, d) == -1)
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return -1;
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if (!d.contains(msg::FLD_CONTRACT_ID))
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{
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LOG_ERROR << "Field contract_id is missing.";
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return -1;
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}
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if (!d[msg::FLD_CONTRACT_ID].is<std::string>())
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{
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LOG_ERROR << "Invalid contract_id value.";
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return -1;
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}
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msg.contract_id = d[msg::FLD_CONTRACT_ID].as<std::string>();
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return 0;
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return 0;
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}
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/**
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* Extracts start message from msg.
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* @param msg Populated msg object.
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* @param d The json document holding the read request message.
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* Accepted signed input container format:
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* {
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* "type": "start",
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* "owner_pubkey": "<pubkey of the owner>",
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* "contract_id": "<contract id>",
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* }
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* @return 0 on successful extraction. -1 for failure.
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*/
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int extract_start_message(start_msg &msg, const jsoncons::json &d)
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{
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if (extract_commons(msg.type, msg.id, msg.pubkey, d) == -1)
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return -1;
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if (!d.contains(msg::FLD_CONTRACT_ID))
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{
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LOG_ERROR << "Field contract_id is missing.";
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return -1;
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}
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if (!d[msg::FLD_CONTRACT_ID].is<std::string>())
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{
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LOG_ERROR << "Invalid contract_id value.";
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return -1;
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}
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msg.contract_id = d[msg::FLD_CONTRACT_ID].as<std::string>();
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return 0;
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return 0;
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}
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/**
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* Extracts stop message from msg.
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* @param msg Populated msg object.
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* @param d The json document holding the read request message.
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* Accepted signed input container format:
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* {
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* "type": "stop",
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* "owner_pubkey": "<pubkey of the owner>",
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* "contract_id": "<contract id>",
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* }
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* @return 0 on successful extraction. -1 for failure.
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*/
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int extract_stop_message(stop_msg &msg, const jsoncons::json &d)
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{
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if (extract_commons(msg.type, msg.id, msg.pubkey, d) == -1)
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return -1;
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if (!d.contains(msg::FLD_CONTRACT_ID))
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{
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LOG_ERROR << "Field contract_id is missing.";
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return -1;
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}
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if (!d[msg::FLD_CONTRACT_ID].is<std::string>())
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{
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LOG_ERROR << "Invalid contract_id value.";
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return -1;
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}
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msg.contract_id = d[msg::FLD_CONTRACT_ID].as<std::string>();
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return 0;
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return 0;
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}
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/**
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* Constructs a response json.
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* @param msg Buffer to construct the generated json message string into.
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* Message format:
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* {
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* 'type': '<message type>',
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* "content": "<any string>"
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* }
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* @param response_type Type of the response.
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* @param content Content inside the response.
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*/
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void create_response(std::string &msg, std::string_view response_type, std::string_view content)
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{
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msg.reserve(1024);
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msg += "{\"";
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msg += msg::FLD_TYPE;
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msg += SEP_COLON;
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msg += response_type;
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msg += SEP_COMMA;
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msg += msg::FLD_CONTENT;
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msg += SEP_COLON;
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msg += content;
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msg += "\"}";
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}
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} // namespace msg::json
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