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import {AvroDecoder} from './AvroDecoder';
import {AvroSchemaValidator} from './AvroSchemaValidator';
import type {
AvroSchema,
AvroRecordSchema,
AvroEnumSchema,
AvroArraySchema,
AvroMapSchema,
AvroUnionSchema,
AvroFixedSchema,
AvroNamedSchema,
} from './types';
/**
* Apache Avro binary decoder with schema validation and decoding.
* Decodes values according to provided Avro schemas with proper validation.
* Based on https://avro.apache.org/docs/1.12.0/specification/
*/
export class AvroSchemaDecoder {
private decoder: AvroDecoder;
private validator: AvroSchemaValidator;
private namedSchemas = new Map<string, AvroNamedSchema>();
constructor(public readonly reader: Reader = new Reader()) {
this.decoder = new AvroDecoder();
this.decoder.reader = reader;
this.validator = new AvroSchemaValidator();
}
/**
* Decodes a value according to the provided schema.
*/
public decode(data: Uint8Array, schema: AvroSchema): unknown {
this.reader.reset(data);
this.namedSchemas.clear();
// Validate schema first
if (!this.validator.validateSchema(schema)) {
throw new Error('Invalid Avro schema');
}
this.collectNamedSchemas(schema);
return this.readValue(schema);
}
/**
* Reads a value according to its schema.
*/
private readValue(schema: AvroSchema): unknown {
const resolvedSchema = this.resolveSchema(schema);
if (typeof resolvedSchema === 'string') {
switch (resolvedSchema) {
case 'null':
return this.decoder.readNull();
case 'boolean':
return this.decoder.readBoolean();
case 'int':
return this.decoder.readInt();
case 'long':
return this.decoder.readLong();
case 'float':
return this.decoder.readFloat();
case 'double':
return this.decoder.readDouble();
case 'bytes':
return this.decoder.readBytes();
case 'string':
return this.decoder.readString();
default:
throw new Error(`Unknown primitive type: ${resolvedSchema}`);
}
}
if (Array.isArray(resolvedSchema)) {
return this.readUnion(resolvedSchema);
}
switch (resolvedSchema.type) {
case 'record':
return this.readRecord(resolvedSchema);
case 'enum':
return this.readEnum(resolvedSchema);
case 'array':
return this.readArray(resolvedSchema);
case 'map':
return this.readMap(resolvedSchema);
case 'fixed':
return this.readFixed(resolvedSchema);
default:
throw new Error(`Unknown schema type: ${(resolvedSchema as any).type}`);
}
}
/**
* Reads a record value according to the record schema.
*/
private readRecord(schema: AvroRecordSchema): Record<string, unknown> {
const result: Record<string, unknown> = {};
for (let i = 0; i < schema.fields.length; i++) {
const field = schema.fields[i];
try {
result[field.name] = this.readValue(field.type);
} catch (error) {
throw new Error(`Error reading field '${field.name}': ${(error as Error).message}`);
}
}
return result;
}
/**
* Reads an enum value according to the enum schema.
*/
private readEnum(schema: AvroEnumSchema): string {
const index = this.decoder.readEnum();
if (index < 0 || index >= schema.symbols.length) {
throw new Error(`Invalid enum index ${index} for enum with ${schema.symbols.length} symbols`);
}
return schema.symbols[index];
}
/**
* Reads an array value according to the array schema.
*/
private readArray(schema: AvroArraySchema): unknown[] {
return this.decoder.readArray(() => this.readValue(schema.items));
}
/**
* Reads a map value according to the map schema.
*/
private readMap(schema: AvroMapSchema): Record<string, unknown> {
return this.decoder.readMap(() => this.readValue(schema.values));
}
/**
* Reads a union value according to the union schema.
*/
private readUnion(schema: AvroUnionSchema): unknown {
const schemaReaders = schema.map((subSchema) => () => this.readValue(subSchema));
const result = this.decoder.readUnion(schemaReaders);
return result.value;
}
/**
* Reads a fixed value according to the fixed schema.
*/
private readFixed(schema: AvroFixedSchema): Uint8Array {
return this.decoder.readFixed(schema.size);
}
/**
* Reads a null value with schema validation.
*/
public readNull(schema: AvroSchema): null {
this.validateSchemaType(schema, 'null');
return this.decoder.readNull();
}
/**
* Reads a boolean value with schema validation.
*/
public readBoolean(schema: AvroSchema): boolean {
this.validateSchemaType(schema, 'boolean');
return this.decoder.readBoolean();
}
/**
* Reads an int value with schema validation.
*/
public readInt(schema: AvroSchema): number {
this.validateSchemaType(schema, 'int');
const value = this.decoder.readInt();
Iif (!Number.isInteger(value) || value < -2147483648 || value > 2147483647) {
throw new Error('Decoded value is not a valid 32-bit integer');
}
return value;
}
/**
* Reads a long value with schema validation.
*/
public readLong(schema: AvroSchema): number | bigint {
this.validateSchemaType(schema, 'long');
return this.decoder.readLong();
}
/**
* Reads a float value with schema validation.
*/
public readFloat(schema: AvroSchema): number {
this.validateSchemaType(schema, 'float');
return this.decoder.readFloat();
}
/**
* Reads a double value with schema validation.
*/
public readDouble(schema: AvroSchema): number {
this.validateSchemaType(schema, 'double');
return this.decoder.readDouble();
}
/**
* Reads a bytes value with schema validation.
*/
public readBytes(schema: AvroSchema): Uint8Array {
this.validateSchemaType(schema, 'bytes');
return this.decoder.readBytes();
}
/**
* Reads a string value with schema validation.
*/
public readString(schema: AvroSchema): string {
this.validateSchemaType(schema, 'string');
return this.decoder.readString();
}
private validateSchemaType(schema: AvroSchema, expectedType: string): void {
const resolvedSchema = this.resolveSchema(schema);
const actualType =
typeof resolvedSchema === 'string'
? resolvedSchema
: Array.isArray(resolvedSchema)
? 'union'
: resolvedSchema.type;
if (actualType !== expectedType) {
throw new Error(`Expected schema type ${expectedType}, got ${actualType}`);
}
}
private resolveSchema(schema: AvroSchema): AvroSchema {
if (typeof schema === 'string') {
const namedSchema = this.namedSchemas.get(schema);
return namedSchema || schema;
}
return schema;
}
private collectNamedSchemas(schema: AvroSchema): void {
if (typeof schema === 'string' || Array.isArray(schema)) {
return;
}
if (typeof schema === 'object' && schema !== null) {
switch (schema.type) {
case 'record': {
const recordSchema = schema as AvroRecordSchema;
const recordFullName = this.getFullName(recordSchema.name, recordSchema.namespace);
this.namedSchemas.set(recordFullName, recordSchema);
recordSchema.fields.forEach((field) => this.collectNamedSchemas(field.type));
break;
}
case 'enum': {
const enumSchema = schema as AvroEnumSchema;
const enumFullName = this.getFullName(enumSchema.name, enumSchema.namespace);
this.namedSchemas.set(enumFullName, enumSchema);
break;
}
case 'fixed': {
const fixedSchema = schema as AvroFixedSchema;
const fixedFullName = this.getFullName(fixedSchema.name, fixedSchema.namespace);
this.namedSchemas.set(fixedFullName, fixedSchema);
break;
}
case 'array':
this.collectNamedSchemas((schema as AvroArraySchema).items);
break;
case 'map':
this.collectNamedSchemas((schema as AvroMapSchema).values);
break;
}
}
}
private getFullName(name: string, namespace?: string): string {
return namespace ? `${namespace}.${name}` : name;
}
}
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