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TimerTrigger Azure function
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| namespace Tweetter.Functions; | |
| public class TweetterTrigger | |
| { | |
| private readonly ContentfulApiOptions _options; | |
| public TweetterTrigger(IOptions<ContentfulApiOptions> options) | |
| { | |
| _options = options.Value; | |
| } | |
| [Function("TweetterTrigger")] | |
| public async Task<TweetterTriggerResponse> Run([TimerTrigger("0 */1 * * * *")] FunctionContext context) | |
| { | |
| var logger = context.GetLogger("TweetterPoster"); | |
| logger.LogInformation("{TweetterTrigger} function executed at: {DateTime}", | |
| nameof(TweetterTrigger), | |
| DateTime.Now.ToString(CultureInfo.InvariantCulture)); | |
| try | |
| { | |
| return await CheckForContentAndProcess(logger); | |
| } | |
| catch (Exception exception) | |
| { | |
| logger.LogError(exception, "Error occurred: {Message}", exception.Message); | |
| throw; | |
| } | |
| } | |
| private async Task<TweetterTriggerResponse> CheckForContentAndProcess(ILogger logger) | |
| { | |
| var httpClient = new HttpClient(); | |
| var client = new ContentfulClient(httpClient, _options); | |
| var builder = QueryBuilder<TweetterContent>.New | |
| .ContentTypeIs("tweetter") | |
| .FieldEquals(f => f.IsPublished, "false") | |
| .FieldLessThanOrEqualTo(f => f.PublishDateTime, DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ")); | |
| logger.LogInformation("Calling Contentful API to check for new entries"); | |
| var entries = await client.GetEntries(builder); | |
| if (!entries.Items.Any()) | |
| { | |
| logger.LogInformation("No tweets to post"); | |
| return null; | |
| } | |
| var entry = entries.Items.OrderBy(f => f.PublishDateTime).First(); | |
| var tweetContent = entry.TweetContent.Content; | |
| var content = new StringBuilder(); | |
| var imageIds = new List<string>(); | |
| foreach (var node in tweetContent) | |
| { | |
| switch (node) | |
| { | |
| case Paragraph paragraph: | |
| content.AppendLine(string.Join("", paragraph.Content.Select(c => ((Text)c).Value).ToList())); | |
| break; | |
| case AssetStructure assetStructure: | |
| imageIds.Add(assetStructure.Data.Target.SystemProperties.Id); | |
| break; | |
| } | |
| } | |
| var assetExists = imageIds.Any(); | |
| Asset asset; | |
| string imageUrl = string.Empty; | |
| if (assetExists) | |
| { | |
| asset = await client.GetAsset(imageIds.First()); | |
| imageUrl = $"https:{asset.File.Url}"; | |
| } | |
| var tweet = new Tweet(content.ToString(), imageUrl, entry.Sys.Id); | |
| var tweetBody = JsonSerializer.Serialize(tweet); | |
| logger.LogInformation("Add new message to post-to-twitter queue"); | |
| return new TweetterTriggerResponse | |
| { | |
| TweetContent = tweetBody | |
| }; | |
| } | |
| } |
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| namespace Tweetter.Models; | |
| public class TweetterTriggerResponse | |
| { | |
| [QueueOutput("post-to-twitter")] | |
| public string TweetContent { get; set; } | |
| } |
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