implemented api phase 7 - running application

MODULE.bazel

@@ -101,6 +101,10 @@ crate.spec(
     package = "reqwest",
     version = "0.11",
 )
+crate.spec(
+    package = "toml",
+    version = "0.8",
+)
 crate.from_specs()
 use_repo(crate, "crates")
 

databuild/BUILD.bazel

@@ -34,6 +34,7 @@ rust_library(
         "@crates//:serde",
         "@crates//:serde_json",
         "@crates//:tokio",
+        "@crates//:toml",
         "@crates//:tower",
         "@crates//:tower-http",
         "@crates//:tracing",

databuild/cli_main.rs

@@ -29,6 +29,10 @@ enum Commands {
         /// Database URL (default: :memory: for in-memory SQLite)
         #[arg(long, default_value = ":memory:")]
         database: String,
+
+        /// Path to configuration file (JSON or TOML)
+        #[arg(long)]
+        config: Option<String>,
     },
 
     /// Create a new want (trigger partition builds)
@@ -78,8 +82,8 @@ fn main() {
     let cli = Cli::parse();
 
     match cli.command {
-        Commands::Serve { port, database } => {
+        Commands::Serve { port, database, config } => {
-            cmd_serve(port, &database);
+            cmd_serve(port, &database, config.as_deref());
         }
         Commands::Want { partitions } => {
             cmd_want(&cli.server, partitions);
@@ -107,12 +111,29 @@ fn main() {
 // ============================================================================
 
 #[tokio::main]
-async fn cmd_serve(port: u16, database: &str) {
+async fn cmd_serve(port: u16, database: &str, config_path: Option<&str>) {
     use databuild::build_event_log::BELStorage;
 
     // Initialize logging
     tracing_subscriber::fmt::init();
 
+    // Load configuration if provided
+    let jobs = if let Some(path) = config_path {
+        match databuild::config::DatabuildConfig::from_file(path) {
+            Ok(config) => {
+                println!("Loaded configuration from: {}", path);
+                println!("  Jobs: {}", config.jobs.len());
+                config.into_job_configurations()
+            }
+            Err(e) => {
+                eprintln!("Failed to load configuration from {}: {}", path, e);
+                std::process::exit(1);
+            }
+        }
+    } else {
+        Vec::new()
+    };
+
     // Create SQLite BEL storage (shared between orchestrator and HTTP server)
     let bel_storage = Arc::new(
         SqliteBELStorage::create(database).expect("Failed to create BEL storage"),
@@ -131,8 +152,8 @@ async fn cmd_serve(port: u16, database: &str) {
     let orch_handle = std::thread::spawn(move || {
         use databuild::orchestrator::{Orchestrator, OrchestratorConfig};
 
-        // Create orchestrator with command channel
+        // Create orchestrator with command channel and jobs from config
-        let config = OrchestratorConfig::default();
+        let config = OrchestratorConfig { jobs };
         let mut orchestrator = Orchestrator::new_with_commands(orch_bel_storage, config, command_rx);
         let mut shutdown_rx = orch_shutdown_rx;
 

databuild/config.rs

@@ -0,0 +1,92 @@
+use crate::JobConfig;
+use crate::job::JobConfiguration;
+use crate::util::DatabuildError;
+use std::fs;
+use std::path::Path;
+
+/// Configuration file format for DataBuild application
+#[derive(Debug, serde::Deserialize)]
+pub struct DatabuildConfig {
+    /// List of job configurations
+    pub jobs: Vec<JobConfig>,
+}
+
+impl DatabuildConfig {
+    /// Load configuration from a file, auto-detecting format from extension
+    pub fn from_file<P: AsRef<Path>>(path: P) -> Result<Self, DatabuildError> {
+        let path = path.as_ref();
+        let contents = fs::read_to_string(path)
+            .map_err(|e| DatabuildError::from(format!("Failed to read config file: {}", e)))?;
+
+        // Determine format from file extension
+        let extension = path.extension().and_then(|s| s.to_str()).unwrap_or("");
+
+        match extension {
+            "json" => Self::from_json(&contents),
+            "toml" => Self::from_toml(&contents),
+            _ => Err(DatabuildError::from(format!(
+                "Unknown config file extension: {}. Use .json or .toml",
+                extension
+            ))),
+        }
+    }
+
+    /// Parse configuration from JSON string
+    pub fn from_json(s: &str) -> Result<Self, DatabuildError> {
+        serde_json::from_str(s)
+            .map_err(|e| DatabuildError::from(format!("Failed to parse JSON config: {}", e)))
+    }
+
+    /// Parse configuration from TOML string
+    pub fn from_toml(s: &str) -> Result<Self, DatabuildError> {
+        toml::from_str(s)
+            .map_err(|e| DatabuildError::from(format!("Failed to parse TOML config: {}", e)))
+    }
+
+    /// Convert to a list of JobConfiguration
+    pub fn into_job_configurations(self) -> Vec<JobConfiguration> {
+        self.jobs.into_iter().map(|jc| jc.into()).collect()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_parse_json_config() {
+        let json = r#"
+        {
+            "jobs": [
+                {
+                    "label": "//test:job_alpha",
+                    "entrypoint": "/usr/bin/python3",
+                    "environment": {"FOO": "bar"},
+                    "partition_patterns": ["data/alpha/.*"]
+                }
+            ]
+        }
+        "#;
+
+        let config = DatabuildConfig::from_json(json).unwrap();
+        assert_eq!(config.jobs.len(), 1);
+        assert_eq!(config.jobs[0].label, "//test:job_alpha");
+    }
+
+    #[test]
+    fn test_parse_toml_config() {
+        let toml = r#"
+        [[jobs]]
+        label = "//test:job_alpha"
+        entrypoint = "/usr/bin/python3"
+        partition_patterns = ["data/alpha/.*"]
+
+        [jobs.environment]
+        FOO = "bar"
+        "#;
+
+        let config = DatabuildConfig::from_toml(toml).unwrap();
+        assert_eq!(config.jobs.len(), 1);
+        assert_eq!(config.jobs[0].label, "//test:job_alpha");
+    }
+}

databuild/job.rs

@@ -2,12 +2,14 @@ use crate::job_run::{JobRunHandle, SubProcessBackend};
 use crate::util::DatabuildError;
 use crate::{JobConfig, PartitionRef, WantDetail};
 use regex::Regex;
+use std::collections::HashMap;
 
 #[derive(Debug, Clone)]
 pub struct JobConfiguration {
     pub label: String,
     pub patterns: Vec<String>,
     pub entry_point: String,
+    pub environment: HashMap<String, String>,
 }
 
 impl JobConfiguration {
@@ -38,6 +40,7 @@ impl From<JobConfig> for JobConfiguration {
             label: config.label,
             patterns: config.partition_patterns,
             entry_point: config.entrypoint,
+            environment: config.environment,
         }
     }
 }

databuild/lib.rs

@@ -1,6 +1,7 @@
 pub mod build_event_log;
 mod build_state;
 pub mod commands;
+pub mod config;
 mod data_deps;
 mod event_transforms;
 pub mod http_server;

databuild/orchestrator.rs

@@ -8,6 +8,7 @@ use crate::{JobRunBufferEventV1, PartitionRef, WantDetail};
 use std::collections::HashMap;
 use std::fmt::Debug;
 use tokio::sync::mpsc;
+use uuid::Uuid;
 
 /**
 Orchestrator turns wants, config, and BEL state into scheduled jobs. It uses lightweight threads +
@@ -25,6 +26,8 @@ pub struct Orchestrator<S: BELStorage + Debug> {
     pub job_runs: Vec<crate::job_run::JobRunHandle<SubProcessBackend>>,
     /// Optional command receiver for write operations from HTTP server
     pub command_rx: Option<mpsc::Receiver<Command>>,
+    /// Environment variables for each job run (keyed by job_run_id)
+    pub job_environments: HashMap<Uuid, HashMap<String, String>>,
 }
 
 impl Default for Orchestrator<MemoryBELStorage> {
@@ -34,6 +37,7 @@ impl Default for Orchestrator<MemoryBELStorage> {
             config: Default::default(),
             job_runs: Default::default(),
             command_rx: None,
+            job_environments: HashMap::new(),
         }
     }
 }
@@ -45,6 +49,7 @@ impl Orchestrator<MemoryBELStorage> {
             config: self.config.clone(),
             job_runs: Default::default(),
             command_rx: None,
+            job_environments: HashMap::new(),
         }
     }
 }
@@ -128,6 +133,7 @@ impl<S: BELStorage + Debug> Orchestrator<S> {
             config,
             job_runs: Vec::new(),
             command_rx: None,
+            job_environments: HashMap::new(),
         }
     }
 
@@ -141,6 +147,7 @@ impl<S: BELStorage + Debug> Orchestrator<S> {
             config,
             job_runs: Vec::new(),
             command_rx: Some(command_rx),
+            job_environments: HashMap::new(),
         }
     }
 
@@ -154,7 +161,9 @@ impl<S: BELStorage + Debug> Orchestrator<S> {
             let transitioned = match job {
                 JobRunHandle::NotStarted(not_started) => {
                     let job_run_id = not_started.job_run_id.clone();
-                    let running = not_started.run(None)?;
+                    // Look up environment for this job run
+                    let env = self.job_environments.get(&job_run_id).cloned();
+                    let running = not_started.run(env)?;
 
                     // Emit heartbeat event to notify BuildState that job is now running
                     let heartbeat_event = Event::JobRunHeartbeatV1(JobRunHeartbeatEventV1 {
@@ -274,9 +283,16 @@ impl<S: BELStorage + Debug> Orchestrator<S> {
         let args: Vec<String> = wanted_refs.iter().map(|pref| pref.r#ref.clone()).collect();
         let job_run = JobRunHandle::spawn(wg.job.entry_point.clone(), args);
 
+        // Store environment for this job run
+        let job_run_id = job_run.job_run_id().clone();
+        if !wg.job.environment.is_empty() {
+            self.job_environments
+                .insert(job_run_id, wg.job.environment.clone());
+        }
+
         // Create job run buffer event
         let job_buffer_event = Event::JobRunBufferV1(JobRunBufferEventV1 {
-            job_run_id: job_run.job_run_id().to_string(),
+            job_run_id: job_run_id.to_string(),
             job_label: wg.job.label,
             building_partitions: wg
                 .wants

examples/multihop/README.md

@@ -0,0 +1,85 @@
+# Multi-Hop Dependency Example
+
+This example demonstrates DataBuild's ability to handle multi-hop dependencies between jobs.
+
+## Overview
+
+The example consists of two jobs:
+
+- **job_alpha**: Produces the `data/alpha` partition
+- **job_beta**: Depends on `data/alpha` and produces `data/beta`
+
+When you request `data/beta`:
+1. Beta job runs and detects missing `data/alpha` dependency
+2. Orchestrator creates a want for `data/alpha`
+3. Alpha job runs and produces `data/alpha`
+4. Beta job runs again and succeeds, producing `data/beta`
+
+## Running the Example
+
+From the repository root:
+
+```bash
+# Build the CLI
+bazel build //databuild:databuild_cli
+
+# Clean up any previous state
+rm -f /tmp/databuild_multihop*.db /tmp/databuild_multihop_alpha_complete
+
+# Start the server with the multihop configuration
+./bazel-bin/databuild/databuild_cli serve \
+  --port 3050 \
+  --database /tmp/databuild_multihop.db \
+  --config examples/multihop/config.json
+```
+
+In another terminal, create a want for `data/beta`:
+
+```bash
+# Create a want for data/beta (which will trigger the dependency chain)
+./bazel-bin/databuild/databuild_cli --server http://localhost:3050 \
+  want data/beta
+
+# Watch the wants
+./bazel-bin/databuild/databuild_cli --server http://localhost:3050 \
+  wants list
+
+# Watch the job runs
+./bazel-bin/databuild/databuild_cli --server http://localhost:3050 \
+  job-runs list
+
+# Watch the partitions
+./bazel-bin/databuild/databuild_cli --server http://localhost:3050 \
+  partitions list
+```
+
+## Expected Behavior
+
+1. Initial want for `data/beta` is created
+2. Beta job runs, detects missing `data/alpha`, reports dependency miss
+3. Orchestrator creates derivative want for `data/alpha`
+4. Alpha job runs and succeeds
+5. Beta job runs again and succeeds
+6. Both partitions are now in `Live` state
+
+## Configuration Format
+
+The example uses JSON format (`config.json`), but TOML is also supported. Here's the equivalent TOML:
+
+```toml
+[[jobs]]
+label = "//examples/multihop:job_alpha"
+entrypoint = "./examples/multihop/job_alpha.sh"
+partition_patterns = ["data/alpha"]
+
+[jobs.environment]
+JOB_NAME = "alpha"
+
+[[jobs]]
+label = "//examples/multihop:job_beta"
+entrypoint = "./examples/multihop/job_beta.sh"
+partition_patterns = ["data/beta"]
+
+[jobs.environment]
+JOB_NAME = "beta"
+```

examples/multihop/config.json

@@ -0,0 +1,20 @@
+{
+  "jobs": [
+    {
+      "label": "//examples/multihop:job_alpha",
+      "entrypoint": "./examples/multihop/job_alpha.sh",
+      "environment": {
+        "JOB_NAME": "alpha"
+      },
+      "partition_patterns": ["data/alpha"]
+    },
+    {
+      "label": "//examples/multihop:job_beta",
+      "entrypoint": "./examples/multihop/job_beta.sh",
+      "environment": {
+        "JOB_NAME": "beta"
+      },
+      "partition_patterns": ["data/beta"]
+    }
+  ]
+}

examples/multihop/job_alpha.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# Job Alpha: Produces data/alpha partition
+# This is a simple upstream job that beta depends on
+
+echo "Job Alpha starting..." >&2
+echo "  Building partitions: $@" >&2
+echo "  Environment: JOB_NAME=$JOB_NAME" >&2
+
+# Simulate some work
+sleep 0.5
+
+# Create marker file to indicate data/alpha is available
+touch /tmp/databuild_multihop_alpha_complete
+
+# Output success - no special output needed, just exit 0
+
+echo "Job Alpha complete!" >&2

examples/multihop/job_beta.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# Job Beta: Produces data/beta partition
+# Depends on data/alpha from job_alpha
+
+echo "Job Beta starting..." >&2
+echo "  Building partitions: $@" >&2
+echo "  Environment: JOB_NAME=$JOB_NAME" >&2
+
+# Check if data/alpha marker exists (this would be real data in a real system)
+ALPHA_MARKER="/tmp/databuild_multihop_alpha_complete"
+
+if [ ! -f "$ALPHA_MARKER" ]; then
+    echo "  Missing dependency: data/alpha" >&2
+    # Report missing dependency
+    echo 'DATABUILD_MISSING_DEPS_JSON:{"version":"1","missing_deps":[{"impacted":[{"ref":"data/beta"}],"missing":[{"ref":"data/alpha"}]}]}'
+    exit 1
+fi
+
+echo "  Found dependency: data/alpha" >&2
+
+# Simulate some work
+sleep 0.5
+
+# Output success - no special output needed, just exit 0
+
+echo "Job Beta complete!" >&2