18cba9c609
Source commit: 6756e5208c8b79e83d55610251430bc1baef53a3 Public tree identity: sha256:2f58837c3759b4f466cbc274571ee71bc0d24c7552dc009c186394e99123da87
129 lines
3.4 KiB
Rust
129 lines
3.4 KiB
Rust
use std::io::{self, BufRead, Write};
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use anyhow::{anyhow, Result};
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use serde_json::{json, Value};
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#[derive(Clone)]
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pub(crate) struct DapWriter {
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seq: i64,
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}
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impl DapWriter {
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pub(crate) fn new() -> Self {
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Self { seq: 1 }
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}
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pub(crate) fn response(
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&mut self,
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request: &Value,
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success: bool,
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body: Value,
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) -> io::Result<()> {
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let command = request
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.get("command")
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.and_then(Value::as_str)
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.unwrap_or("<unknown>");
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let request_seq = request.get("seq").and_then(Value::as_i64).unwrap_or(0);
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let seq = self.next_seq();
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self.write(json!({
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"seq": seq,
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"type": "response",
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"request_seq": request_seq,
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"success": success,
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"command": command,
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"body": body,
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}))
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}
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pub(crate) fn error_response(
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&mut self,
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request: &Value,
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message: impl Into<String>,
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) -> io::Result<()> {
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let command = request
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.get("command")
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.and_then(Value::as_str)
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.unwrap_or("<unknown>");
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let request_seq = request.get("seq").and_then(Value::as_i64).unwrap_or(0);
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let seq = self.next_seq();
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self.write(json!({
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"seq": seq,
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"type": "response",
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"request_seq": request_seq,
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"success": false,
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"command": command,
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"message": message.into(),
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}))
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}
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pub(crate) fn event(&mut self, event: &str, body: Value) -> io::Result<()> {
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let seq = self.next_seq();
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self.write(json!({
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"seq": seq,
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"type": "event",
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"event": event,
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"body": body,
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}))
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}
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pub(crate) fn output(&mut self, category: &str, output: impl Into<String>) -> io::Result<()> {
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self.event(
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"output",
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json!({
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"category": category,
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"output": output.into(),
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}),
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)
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}
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fn next_seq(&mut self) -> i64 {
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let seq = self.seq;
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self.seq += 1;
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seq
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}
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fn write(&mut self, message: Value) -> io::Result<()> {
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let payload = serde_json::to_vec(&message)?;
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let mut out = io::stdout().lock();
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write!(out, "Content-Length: {}\r\n\r\n", payload.len())?;
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out.write_all(&payload)?;
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out.flush()
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}
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}
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pub(crate) fn initialize_capabilities() -> Value {
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json!({
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"supportsConfigurationDoneRequest": true,
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"supportsTerminateRequest": true,
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"supportsRestartRequest": true,
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"supportsRestartFrame": true,
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"supportsEvaluateForHovers": true,
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"supportsStepBack": false,
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})
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}
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pub(crate) fn read_message<R: BufRead>(reader: &mut R) -> Result<Option<Value>> {
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let mut content_length = None;
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loop {
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let mut line = String::new();
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let bytes = reader.read_line(&mut line)?;
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if bytes == 0 {
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return Ok(None);
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}
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let line = line.trim_end_matches(['\r', '\n']);
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if line.is_empty() {
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break;
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}
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if let Some(value) = line.strip_prefix("Content-Length:") {
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content_length = Some(value.trim().parse::<usize>()?);
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}
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}
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let length = content_length.ok_or_else(|| anyhow!("DAP message missing Content-Length"))?;
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let mut payload = vec![0; length];
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reader.read_exact(&mut payload)?;
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Ok(Some(serde_json::from_slice(&payload)?))
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}
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