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| 1 | +use std::{collections::HashMap, path::PathBuf}; |
| 2 | + |
| 3 | +use backend_api::{LogEntry, LogLevel}; |
| 4 | +use base64::{engine::general_purpose::STANDARD as BASE64, Engine}; |
| 5 | +use clap::Parser; |
| 6 | +use opentelemetry::{ |
| 7 | + logs::{AnyValue, Logger as _, LoggerProvider as _, Severity}, |
| 8 | + KeyValue, |
| 9 | +}; |
| 10 | +use opentelemetry_otlp::WithExportConfig; |
| 11 | +use opentelemetry_sdk::{ |
| 12 | + logs::{BatchConfigBuilder, BatchLogProcessor, LogRecord, Logger, LoggerProvider}, |
| 13 | + runtime::Tokio, |
| 14 | + Resource, |
| 15 | +}; |
| 16 | + |
| 17 | +mod fetcher; |
| 18 | +mod utils; |
| 19 | + |
| 20 | +use fetcher::LogFetcher; |
| 21 | +use utils::now; |
| 22 | + |
| 23 | +/// `2048` is the default batch size for the OTLP logs batch processor. |
| 24 | +/// We use `2048 * 4` to accommodate cases where we fetch a lot of logs at once. |
| 25 | +const LOGS_PROCESSOR_MAX_QUEUE_SIZE_DEFAULT: usize = 2_048 * 4; |
| 26 | + |
| 27 | +fn init_telemetry(args: &Args) -> anyhow::Result<LoggerProvider> { |
| 28 | + let headers = { |
| 29 | + let mut headers = HashMap::new(); |
| 30 | + let auth_header = format!( |
| 31 | + "Basic {}", |
| 32 | + BASE64.encode(format!("{}:{}", args.loki_username, args.loki_password)) |
| 33 | + ); |
| 34 | + headers.insert("Authorization".to_string(), auth_header.parse().unwrap()); |
| 35 | + headers |
| 36 | + }; |
| 37 | + // from https://grafana.com/docs/loki/latest/reference/loki-http-api/#ingest-logs-using-otlp |
| 38 | + let loki_endpoint = format!("{}/otlp/v1/logs", args.loki_endpoint); |
| 39 | + let exporter = opentelemetry_otlp::new_exporter() |
| 40 | + .http() |
| 41 | + .with_endpoint(loki_endpoint) |
| 42 | + .with_headers(headers) |
| 43 | + .build_log_exporter()?; |
| 44 | + |
| 45 | + let processor = BatchLogProcessor::builder(exporter, Tokio) |
| 46 | + .with_batch_config( |
| 47 | + BatchConfigBuilder::default() |
| 48 | + .with_max_queue_size(LOGS_PROCESSOR_MAX_QUEUE_SIZE_DEFAULT) |
| 49 | + .build(), |
| 50 | + ) |
| 51 | + .build(); |
| 52 | + |
| 53 | + let logger_provider = LoggerProvider::builder() |
| 54 | + .with_log_processor(processor) |
| 55 | + .with_resource(Resource::new(vec![ |
| 56 | + KeyValue::new( |
| 57 | + opentelemetry_semantic_conventions::resource::SERVICE_NAME, |
| 58 | + "backend_canister", |
| 59 | + ), |
| 60 | + KeyValue::new("canister_id", args.backend_canister_id.clone()), |
| 61 | + ])) |
| 62 | + .build(); |
| 63 | + |
| 64 | + Ok(logger_provider) |
| 65 | +} |
| 66 | + |
| 67 | +fn build_logger(provider: &LoggerProvider) -> Logger { |
| 68 | + provider.logger_builder("backend_canister_logger").build() |
| 69 | +} |
| 70 | + |
| 71 | +struct LogEntryAdapter(LogEntry); |
| 72 | + |
| 73 | +impl TryInto<LogRecord> for LogEntryAdapter { |
| 74 | + type Error = anyhow::Error; |
| 75 | + |
| 76 | + fn try_into(self) -> Result<LogRecord, Self::Error> { |
| 77 | + let mut log_record = LogRecord::default(); |
| 78 | + log_record.timestamp = |
| 79 | + Some(chrono::DateTime::parse_from_rfc3339(&self.0.date_time)?.into()); |
| 80 | + log_record.observed_timestamp = Some(now()); |
| 81 | + log_record.severity_number = Some(match self.0.level { |
| 82 | + LogLevel::Info => Severity::Info, |
| 83 | + LogLevel::Warn => Severity::Warn, |
| 84 | + LogLevel::Error => Severity::Error, |
| 85 | + }); |
| 86 | + let mut body = HashMap::new(); |
| 87 | + body.insert("message".into(), self.0.message.into()); |
| 88 | + if let Some(context) = self.0.context { |
| 89 | + body.insert("context".into(), context.into()); |
| 90 | + } |
| 91 | + log_record.body = Some(AnyValue::Map(Box::new(body))); |
| 92 | + |
| 93 | + Ok(log_record) |
| 94 | + } |
| 95 | +} |
| 96 | + |
| 97 | +#[derive(Parser, Debug)] |
| 98 | +#[command(author, version, about, long_about = None)] |
| 99 | +struct Args { |
| 100 | + /// Path to the identity PEM file |
| 101 | + #[arg(long, value_name = "FILE")] |
| 102 | + identity_pem: PathBuf, |
| 103 | + |
| 104 | + /// Loki endpoint URL |
| 105 | + #[arg(long, value_name = "URL")] |
| 106 | + loki_endpoint: String, |
| 107 | + |
| 108 | + /// Loki username |
| 109 | + #[arg(long)] |
| 110 | + loki_username: String, |
| 111 | + |
| 112 | + /// Loki password |
| 113 | + #[arg(long)] |
| 114 | + loki_password: String, |
| 115 | + |
| 116 | + /// Backend canister ID |
| 117 | + #[arg(long, value_name = "CANISTER_ID")] |
| 118 | + backend_canister_id: String, |
| 119 | +} |
| 120 | + |
| 121 | +#[tokio::main] |
| 122 | +async fn main() -> anyhow::Result<()> { |
| 123 | + let args = Args::parse(); |
| 124 | + |
| 125 | + // we need to keep the logger provider in memory because the drop implementation shuts down the processors |
| 126 | + let logger_provider = init_telemetry(&args)?; |
| 127 | + let logger = build_logger(&logger_provider); |
| 128 | + |
| 129 | + let mut log_fetcher = LogFetcher::new(args.identity_pem, args.backend_canister_id)?; |
| 130 | + |
| 131 | + let logs = log_fetcher.fetch_logs().await?; |
| 132 | + println!("Sending {} logs to Loki...", logs.len()); |
| 133 | + for log in logs { |
| 134 | + let log_entry = LogEntryAdapter(log); |
| 135 | + logger.emit(log_entry.try_into()?); |
| 136 | + } |
| 137 | + println!("Logs sent to Loki"); |
| 138 | + |
| 139 | + Ok(()) |
| 140 | +} |
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