refactor: move fee selection out of indexer selection (#419)

This removes Agora (and therefore GraphQL-specific) cost models from
indexer-selection. The fee negotiation step now happens before indexer
selections (and no longer requires a retry). For now, the interaction
between budgeting & candidate fees is simple, but that's acceptable for
now since we are paying indexers more than they are requesting. Volume
discounting has been removed entirely.

Cargo.toml

@@ -13,7 +13,6 @@ debug = true
 [workspace.dependencies]
 anyhow = "1.0"
 alloy-primitives = { version = "0.4.2", features = ["serde"] }
-eventuals = "0.6.7"
 rand = { version = "0.8", features = ["small_rng"] }
 reqwest = { version = "0.11", default-features = false, features = [
     "json",

graph-gateway/Cargo.toml

@@ -13,13 +13,16 @@ axum = { version = "0.6.15", default-features = false, features = [
     "original-uri",
 ] }
 chrono = { version = "0.4", default-features = false, features = ["clock"] }
+cost-model = { git = "https://github.com/graphprotocol/agora", rev = "9984f9e" }
 ethers = { version = "2.0.10", default-features = false, features = ["abigen"] }
-eventuals.workspace = true
+eventuals = "0.6.7"
 faster-hex = "0.8.0"
 futures = "0.3"
 graph-subscriptions = { git = "https://github.com/edgeandnode/subscription-payments", rev = "334d18b" }
 graphql = { git = "https://github.com/edgeandnode/toolshed", tag = "graphql-v0.1.0" }
-graphql-http = { git = "https://github.com/edgeandnode/toolshed.git", tag = "graphql-http-v0.1.0", features = ["http-reqwest"] }
+graphql-http = { git = "https://github.com/edgeandnode/toolshed.git", tag = "graphql-http-v0.1.0", features = [
+    "http-reqwest",
+] }
 hex = "0.4"
 indexer-selection = { path = "../indexer-selection" }
 indoc = "2.0.3"

graph-gateway/src/block_constraints.rs

@@ -1,16 +1,16 @@
 use std::collections::{BTreeMap, BTreeSet};
 
 use alloy_primitives::{BlockHash, BlockNumber};
+use cost_model::Context;
 use graphql::graphql_parser::query::{
     Definition, Document, OperationDefinition, Selection, Text, Value,
 };
 use graphql::{IntoStaticValue as _, QueryVariables, StaticValue};
+use indexer_selection::UnresolvedBlock;
 use itertools::Itertools as _;
 use serde_json::{self, json};
 use toolshed::thegraph::BlockPointer;
 
-use indexer_selection::{Context, UnresolvedBlock};
-
 #[derive(Clone, Debug, Eq, PartialEq, Ord, PartialOrd)]
 pub enum BlockConstraint {
     Unconstrained,
@@ -29,7 +29,9 @@ impl BlockConstraint {
     }
 }
 
-pub fn block_constraints<'c>(context: &'c Context<'c>) -> Option<BTreeSet<BlockConstraint>> {
+pub fn block_constraints<'c>(
+    context: &'c Context<'c, String>,
+) -> Option<BTreeSet<BlockConstraint>> {
     let mut constraints = BTreeSet::new();
     let vars = &context.variables;
     // ba6c90f1-3baf-45be-ac1c-f60733404436
@@ -72,7 +74,7 @@ pub fn block_constraints<'c>(context: &'c Context<'c>) -> Option<BTreeSet<BlockC
 }
 
 pub fn make_query_deterministic(
-    mut ctx: Context<'_>,
+    mut ctx: Context<'_, String>,
     resolved: &BTreeSet<BlockPointer>,
     latest: &BlockPointer,
 ) -> Option<String> {