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Incorporate support to convert Kafka headers to HTTP headers #1051

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merged 5 commits into from
Nov 20, 2024
Merged

Incorporate support to convert Kafka headers to HTTP headers #1051

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e8a306a
Add functionality to map kafka-headers into http headers
ayeshLK Nov 20, 2024
3550385
Add support to map HTTP headers to kafka-headers
ayeshLK Nov 20, 2024
c2dfddd
Refactor the kafka producer-message constructing logic
ayeshLK Nov 20, 2024
d955225
Add script to build the docker-images
ayeshLK Nov 20, 2024
358540c
Restructure import order
ayeshLK Nov 20, 2024
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17 changes: 14 additions & 3 deletions examples/kafka-hub/hub/modules/persistence/persistence.bal
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
import ballerina/websubhub;
import kafkaHub.config;
import kafkaHub.connections as conn;
import ballerinax/kafka;
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public isolated function addRegsiteredTopic(websubhub:TopicRegistration message) returns error? {
check updateHubState(message);
Expand Down Expand Up @@ -49,8 +50,18 @@ public isolated function addUpdateMessage(string topicName, websubhub:UpdateMess
check produceKafkaMessage(topicName, payload);
}

isolated function produceKafkaMessage(string topicName, json payload) returns error? {
byte[] serializedContent = payload.toJsonString().toBytes();
check conn:statePersistProducer->send({ topic: topicName, value: serializedContent });
isolated function produceKafkaMessage(string topicName, json payload,
map<string|string[]> headers = {}) returns error? {
kafka:AnydataProducerRecord message = getProducerMsg(topicName, payload, headers);
check conn:statePersistProducer->send(message);
check conn:statePersistProducer->'flush();
}

isolated function getProducerMsg(string topic, json payload,
map<string|string[]> headers) returns kafka:AnydataProducerRecord {
byte[] value = payload.toJsonString().toBytes();
if headers.length() == 0 {
return { topic, value };
}
return { topic, value, headers };
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}
15 changes: 14 additions & 1 deletion examples/kafka-hub/hub/websub_subscribers.bal
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Expand Up @@ -131,7 +131,20 @@ isolated function deSerializeKafkaRecord(kafka:ConsumerRecord kafkaRecord) retur
json payload = check value:fromJsonString(message);
websubhub:ContentDistributionMessage distributionMsg = {
content: payload,
contentType: mime:APPLICATION_JSON
contentType: mime:APPLICATION_JSON,
headers: check getHeaders(kafkaRecord)
};
return distributionMsg;
}

isolated function getHeaders(kafka:ConsumerRecord kafkaRecord) returns map<string|string[]>|error {
map<string|string[]> headers = {};
foreach var ['key, value] in kafkaRecord.headers.entries().toArray() {
if value is string || value is string[] {
headers['key] = value;
} else if value is byte[] {
headers['key] = check string:fromBytes(value);
}
}
return headers;
}
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