feat: Add ReadEvents with the associated dependencies and the test client file was split

src/Bound.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Thenativeweb\Eventsourcingdb;
+
+use JsonSerializable;
+
+enum BoundType: string
+{
+    case INCLUSIVE = 'inclusive';
+    case EXCLUSIVE = 'exclusive';
+}
+
+class Bound implements JsonSerializable
+{
+    public function __construct(
+        public string $id,
+        public BoundType $type,
+    ) {
+    }
+
+    public function jsonSerialize(): array
+    {
+        return [
+            'id' => $this->id,
+            'type' => $this->type->value,
+        ];
+    }
+}

src/Client.php

@@ -7,6 +7,7 @@
 use DateTimeImmutable;
 use GuzzleHttp\Client as HttpClient;
 use RuntimeException;
+use Thenativeweb\Eventsourcingdb\Stream\NdJson;
 
 final readonly class Client
 {
@@ -34,7 +35,7 @@ public function ping(): void
             ));
         }
 
-        $body = (string) $response->getBody();
+        $body = $response->getBody()->getContents();
         $data = json_decode($body, true);
 
         if (!isset($data['type']) || $data['type'] !== 'io.eventsourcingdb.api.ping-received') {
@@ -61,15 +62,15 @@ public function verifyApiToken(): void
             ));
         }
 
-        $body = (string) $response->getBody();
+        $body = $response->getBody()->getContents();
         $data = json_decode($body, true);
 
         if (!isset($data['type']) || $data['type'] !== 'io.eventsourcingdb.api.api-token-verified') {
             throw new RuntimeException('Failed to verify API token');
         }
     }
 
-    public function writeEvents(array $events, array $preconditions = []): array
+    public function writeEvents(array $events, array $preconditions = []): iterable
     {
         $requestBody = [
             'events' => $events,
@@ -97,24 +98,90 @@ public function writeEvents(array $events, array $preconditions = []): array
             ));
         }
 
-        $body = (string) $response->getBody();
+        $body = $response->getBody()->getContents();
+        if ($body === '') {
+            return;
+        }
+
+        if (!json_validate($body)) {
+            throw new RuntimeException('Failed to read events.');
+        }
+
         $data = json_decode($body, true);
+        if (!is_array($data)) {
+            throw new RuntimeException('Failed to read events, expected an array.');
+        }
+
+        foreach ($data as $item) {
+            $cloudEvent = new CloudEvent(
+                $item['specversion'],
+                $item['id'],
+                new DateTimeImmutable($item['time']),
+                $item['source'],
+                $item['subject'],
+                $item['type'],
+                $item['datacontenttype'],
+                $item['data'],
+                $item['hash'],
+                $item['predecessorhash'],
+                $item['traceparent'] ?? null,
+                $item['tracestate'] ?? null,
+            );
+            yield $cloudEvent;
+        }
+    }
+
+    public function readEvents(string $subject, ReadEventsOptions $readEventsOptions): iterable
+    {
+        $requestBody = [
+            'subject' => $subject,
+            'options' => $readEventsOptions,
+        ];
+
+        $response = $this->httpClient->post(
+            '/api/v1/read-events',
+            [
+                'headers' => [
+                    'Authorization' => 'Bearer ' . $this->apiToken,
+                    'Content-Type' => 'application/json',
+                ],
+                'json' => $requestBody,
+            ],
+        );
+        $status = $response->getStatusCode();
 
-        $writtenEvents = array_map(fn ($item): CloudEvent => new CloudEvent(
-            $item['specversion'],
-            $item['id'],
-            new DateTimeImmutable($item['time']),
-            $item['source'],
-            $item['subject'],
-            $item['type'],
-            $item['datacontenttype'],
-            $item['data'],
-            $item['hash'],
-            $item['predecessorhash'],
-            $item['traceparent'] ?? null,
-            $item['tracestate'] ?? null,
-        ), $data);
-
-        return $writtenEvents;
+        if ($status !== 200) {
+            throw new RuntimeException(sprintf(
+                "Failed to read events, got HTTP status code '%d', expected '200'",
+                $status
+            ));
+        }
+
+        foreach (NdJson::readStream($response->getBody()) as $eventLine) {
+            switch ($eventLine->type) {
+                case 'event':
+                    $cloudEvent = new CloudEvent(
+                        $eventLine->payload['specversion'],
+                        $eventLine->payload['id'],
+                        new DateTimeImmutable($eventLine->payload['time']),
+                        $eventLine->payload['source'],
+                        $eventLine->payload['subject'],
+                        $eventLine->payload['type'],
+                        $eventLine->payload['datacontenttype'],
+                        $eventLine->payload['data'],
+                        $eventLine->payload['hash'],
+                        $eventLine->payload['predecessorhash'],
+                        $eventLine->payload['traceparent'] ?? null,
+                        $eventLine->payload['tracestate'] ?? null,
+                    );
+                    yield $cloudEvent;
+
+                    break;
+                case 'error':
+                    throw new RuntimeException($eventLine->payload['error'] ?? 'unknown error');
+                default:
+                    throw new RuntimeException("Failed to handle unsupported line type {$eventLine->type}");
+            }
+        }
     }
 }

src/ReadEventsOptions.php

@@ -0,0 +1,75 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Thenativeweb\Eventsourcingdb;
+
+use JsonSerializable;
+
+enum Order: string
+{
+    case CHRONOLOGICAL = 'chronological';
+    case ANTICHRONOLOGICAL = 'antichronological';
+}
+
+enum ReadIfEventIsMissing: string
+{
+    case READ_NOTHING = 'read-nothing';
+    case READ_EVERYTHING = 'read-everything';
+}
+
+class ReadFromLatestEvent implements JsonSerializable
+{
+    public function __construct(
+        public string $subject,
+        public string $type,
+        public ReadIfEventIsMissing $ifEventIsMissing,
+    ) {
+    }
+
+    public function jsonSerialize(): array
+    {
+        return [
+            'subject' => $this->subject,
+            'type' => $this->type,
+            'ifEventIsMissing' => $this->ifEventIsMissing->value,
+        ];
+    }
+}
+
+class ReadEventsOptions implements JsonSerializable
+{
+    public function __construct(
+        public bool $recursive = false,
+        public ?Order $order = null,
+        public ?Bound $lowerBound = null,
+        public ?Bound $upperBound = null,
+        public ?ReadFromLatestEvent $fromLatestEvent = null
+    ) {
+    }
+
+    public function jsonSerialize(): mixed
+    {
+        $result = [
+            'recursive' => $this->recursive,
+        ];
+
+        if ($this->order instanceof Order) {
+            $result['order'] = $this->order->value;
+        }
+
+        if ($this->lowerBound instanceof Bound) {
+            $result['lowerBound'] = $this->lowerBound->jsonSerialize();
+        }
+
+        if ($this->upperBound instanceof Bound) {
+            $result['upperBound'] = $this->upperBound->jsonSerialize();
+        }
+
+        if ($this->fromLatestEvent instanceof ReadFromLatestEvent) {
+            $result['fromLatestEvent'] = $this->fromLatestEvent->jsonSerialize();
+        }
+
+        return $result;
+    }
+}

src/Stream/NdJson.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Thenativeweb\Eventsourcingdb\Stream;
+
+use Psr\Http\Message\StreamInterface;
+use RuntimeException;
+
+final readonly class NdJson
+{
+    public static function readLine(StreamInterface $stream): string
+    {
+        $buffer = '';
+
+        while (!$stream->eof()) {
+            if ('' === ($byte = $stream->read(1))) {
+                return $buffer;
+            }
+
+            $buffer .= $byte;
+            if ($byte === "\n") {
+                break;
+            }
+        }
+
+        return $buffer;
+    }
+
+    public static function readStream(StreamInterface $stream): iterable
+    {
+        while (!$stream->eof()) {
+            $line = self::readLine($stream);
+            if ($line === '') {
+                continue;
+            }
+
+            if (!json_validate($line)) {
+                throw new RuntimeException('Failed to read events.');
+            }
+
+            $item = json_decode($line, true);
+            if (!is_array($item)) {
+                throw new RuntimeException('Failed to read events, expected an array.');
+            }
+
+            $eventLine = new ReadEventLine(
+                $item['type'] ?? 'unknown',
+                $item['payload'] ?? [],
+            );
+            yield $eventLine;
+        }
+    }
+}

src/Stream/ReadEventLine.php

@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Thenativeweb\Eventsourcingdb\Stream;
+
+final readonly class ReadEventLine
+{
+    public function __construct(
+        public string $type,
+        public array $payload,
+    ) {
+    }
+}